==================================================================
BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
Read of size 1 at addr ffff888032e4e8d8 by task jfsCommit/111
CPU: 1 UID: 0 PID: 111 Comm: jfsCommit Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xcd/0x630 mm/kasan/report.c:482
kasan_report+0xe0/0x110 mm/kasan/report.c:595
__kasan_check_byte+0x36/0x50 mm/kasan/common.c:580
kasan_check_byte include/linux/kasan.h:401 [inline]
lock_acquire kernel/locking/lockdep.c:5842 [inline]
lock_acquire+0xfc/0x350 kernel/locking/lockdep.c:5825
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
__mutex_lock_common kernel/locking/mutex.c:612 [inline]
__mutex_lock+0x289/0x1060 kernel/locking/mutex.c:760
jfs_syncpt+0x2a/0xa0 fs/jfs/jfs_logmgr.c:1039
txEnd+0x30a/0x5a0 fs/jfs/jfs_txnmgr.c:550
txLazyCommit fs/jfs/jfs_txnmgr.c:2685 [inline]
jfs_lazycommit+0x783/0xb30 fs/jfs/jfs_txnmgr.c:2734
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x56d/0x730 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 10210:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:417
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
open_inline_log fs/jfs/jfs_logmgr.c:1159 [inline]
lmLogOpen+0x571/0x13c0 fs/jfs/jfs_logmgr.c:1069
jfs_mount_rw+0x2e9/0x6f0 fs/jfs/jfs_mount.c:257
jfs_fill_super+0xc46/0x1040 fs/jfs/super.c:532
get_tree_bdev_flags+0x38c/0x620 fs/super.c:1691
vfs_get_tree+0x8e/0x340 fs/super.c:1751
fc_mount fs/namespace.c:1208 [inline]
do_new_mount_fc fs/namespace.c:3651 [inline]
do_new_mount fs/namespace.c:3727 [inline]
path_mount+0x7b9/0x23a0 fs/namespace.c:4037
do_mount fs/namespace.c:4050 [inline]
__do_sys_mount fs/namespace.c:4238 [inline]
__se_sys_mount fs/namespace.c:4215 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4215
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 5845:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
__kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:587
kasan_save_free_info mm/kasan/kasan.h:406 [inline]
poison_slab_object mm/kasan/common.c:252 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:234 [inline]
slab_free_hook mm/slub.c:2514 [inline]
slab_free mm/slub.c:6566 [inline]
kfree+0x2b8/0x6d0 mm/slub.c:6773
lmLogClose+0x585/0x710 fs/jfs/jfs_logmgr.c:1460
jfs_umount+0x2f0/0x440 fs/jfs/jfs_umount.c:114
jfs_put_super+0x88/0x1d0 fs/jfs/super.c:194
generic_shutdown_super+0x156/0x390 fs/super.c:642
kill_block_super+0x3b/0x90 fs/super.c:1722
deactivate_locked_super+0xc1/0x1a0 fs/super.c:473
deactivate_super fs/super.c:506 [inline]
deactivate_super+0xde/0x100 fs/super.c:502
cleanup_mnt+0x225/0x450 fs/namespace.c:1327
task_work_run+0x150/0x240 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xec/0x130 kernel/entry/common.c:43
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x419/0x4e0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888032e4e800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 216 bytes inside of
freed 1024-byte region [ffff888032e4e800, ffff888032e4ec00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x32e48
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b026dc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b026dc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0000cb9201 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5841, tgid 5841 (syz-executor), ts 106932545124, free_ts 106894310892
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1850
prep_new_page mm/page_alloc.c:1858 [inline]
get_page_from_freelist+0x10a3/0x3a30 mm/page_alloc.c:3884
__alloc_frozen_pages_noprof+0x25f/0x2470 mm/page_alloc.c:5183
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:3030 [inline]
allocate_slab mm/slub.c:3203 [inline]
new_slab+0x24a/0x360 mm/slub.c:3257
___slab_alloc+0xdc4/0x1ae0 mm/slub.c:4627
__slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4746
__slab_alloc_node mm/slub.c:4822 [inline]
slab_alloc_node mm/slub.c:5233 [inline]
__kmalloc_cache_noprof+0x477/0x780 mm/slub.c:5719
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
batadv_hardif_add_interface net/batman-adv/hard-interface.c:874 [inline]
batadv_hard_if_event+0xb13/0x1550 net/batman-adv/hard-interface.c:958
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2229
call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
call_netdevice_notifiers net/core/dev.c:2281 [inline]
register_netdevice+0x182e/0x2270 net/core/dev.c:11332
ip6gre_newlink_common.constprop.0+0x14e/0x340 net/ipv6/ip6_gre.c:1956
ip6gre_newlink+0x17d/0x400 net/ipv6/ip6_gre.c:1989
rtnl_newlink_create net/core/rtnetlink.c:3833 [inline]
__rtnl_newlink net/core/rtnetlink.c:3950 [inline]
rtnl_newlink+0xc45/0x2000 net/core/rtnetlink.c:4065
rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6954
page last free pid 5850 tgid 5850 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
__free_frozen_pages+0x7df/0x1160 mm/page_alloc.c:2906
discard_slab mm/slub.c:3301 [inline]
__put_partials+0x130/0x170 mm/slub.c:3848
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:352
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4946 [inline]
slab_alloc_node mm/slub.c:5245 [inline]
__kmalloc_cache_noprof+0x274/0x780 mm/slub.c:5719
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
ref_tracker_alloc+0x18e/0x5b0 lib/ref_tracker.c:271
__netdev_tracker_alloc include/linux/netdevice.h:4375 [inline]
netdev_hold include/linux/netdevice.h:4404 [inline]
netdev_hold include/linux/netdevice.h:4399 [inline]
rx_queue_add_kobject net/core/net-sysfs.c:1257 [inline]
net_rx_queue_update_kobjects+0x334/0x770 net/core/net-sysfs.c:1322
register_queue_kobjects net/core/net-sysfs.c:2114 [inline]
netdev_register_kobject+0x290/0x3d0 net/core/net-sysfs.c:2362
register_netdevice+0x13dc/0x2270 net/core/dev.c:11294
team_newlink+0xb4/0x190 drivers/net/team/team_core.c:2213
rtnl_newlink_create net/core/rtnetlink.c:3833 [inline]
__rtnl_newlink net/core/rtnetlink.c:3950 [inline]
rtnl_newlink+0xc45/0x2000 net/core/rtnetlink.c:4065
rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6954
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1896
Memory state around the buggy address:
ffff888032e4e780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888032e4e800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888032e4e880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888032e4e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888032e4e980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
BUG: KASAN: slab-use-after-free in do_raw_spin_lock+0x26f/0x2b0 kernel/locking/spinlock_debug.c:115
Read of size 4 at addr ffff888032e4e8c4 by task jfsCommit/111
CPU: 1 UID: 0 PID: 111 Comm: jfsCommit Tainted: G B syzkaller #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xcd/0x630 mm/kasan/report.c:482
kasan_report+0xe0/0x110 mm/kasan/report.c:595
debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
do_raw_spin_lock+0x26f/0x2b0 kernel/locking/spinlock_debug.c:115
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0x42/0x60 kernel/locking/spinlock.c:162
__mutex_lock_common kernel/locking/mutex.c:612 [inline]
__mutex_lock+0x289/0x1060 kernel/locking/mutex.c:760
jfs_syncpt+0x2a/0xa0 fs/jfs/jfs_logmgr.c:1039
txEnd+0x30a/0x5a0 fs/jfs/jfs_txnmgr.c:550
txLazyCommit fs/jfs/jfs_txnmgr.c:2685 [inline]
jfs_lazycommit+0x783/0xb30 fs/jfs/jfs_txnmgr.c:2734
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x56d/0x730 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 10210:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:417
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
open_inline_log fs/jfs/jfs_logmgr.c:1159 [inline]
lmLogOpen+0x571/0x13c0 fs/jfs/jfs_logmgr.c:1069
jfs_mount_rw+0x2e9/0x6f0 fs/jfs/jfs_mount.c:257
jfs_fill_super+0xc46/0x1040 fs/jfs/super.c:532
get_tree_bdev_flags+0x38c/0x620 fs/super.c:1691
vfs_get_tree+0x8e/0x340 fs/super.c:1751
fc_mount fs/namespace.c:1208 [inline]
do_new_mount_fc fs/namespace.c:3651 [inline]
do_new_mount fs/namespace.c:3727 [inline]
path_mount+0x7b9/0x23a0 fs/namespace.c:4037
do_mount fs/namespace.c:4050 [inline]
__do_sys_mount fs/namespace.c:4238 [inline]
__se_sys_mount fs/namespace.c:4215 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4215
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 5845:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
__kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:587
kasan_save_free_info mm/kasan/kasan.h:406 [inline]
poison_slab_object mm/kasan/common.c:252 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:234 [inline]
slab_free_hook mm/slub.c:2514 [inline]
slab_free mm/slub.c:6566 [inline]
kfree+0x2b8/0x6d0 mm/slub.c:6773
lmLogClose+0x585/0x710 fs/jfs/jfs_logmgr.c:1460
jfs_umount+0x2f0/0x440 fs/jfs/jfs_umount.c:114
jfs_put_super+0x88/0x1d0 fs/jfs/super.c:194
generic_shutdown_super+0x156/0x390 fs/super.c:642
kill_block_super+0x3b/0x90 fs/super.c:1722
deactivate_locked_super+0xc1/0x1a0 fs/super.c:473
deactivate_super fs/super.c:506 [inline]
deactivate_super+0xde/0x100 fs/super.c:502
cleanup_mnt+0x225/0x450 fs/namespace.c:1327
task_work_run+0x150/0x240 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xec/0x130 kernel/entry/common.c:43
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x419/0x4e0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888032e4e800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 196 bytes inside of
freed 1024-byte region [ffff888032e4e800, ffff888032e4ec00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x32e48
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b026dc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b026dc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0000cb9201 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5841, tgid 5841 (syz-executor), ts 106932545124, free_ts 106894310892
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1850
prep_new_page mm/page_alloc.c:1858 [inline]
get_page_from_freelist+0x10a3/0x3a30 mm/page_alloc.c:3884
__alloc_frozen_pages_noprof+0x25f/0x2470 mm/page_alloc.c:5183
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:3030 [inline]
allocate_slab mm/slub.c:3203 [inline]
new_slab+0x24a/0x360 mm/slub.c:3257
___slab_alloc+0xdc4/0x1ae0 mm/slub.c:4627
__slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4746
__slab_alloc_node mm/slub.c:4822 [inline]
slab_alloc_node mm/slub.c:5233 [inline]
__kmalloc_cache_noprof+0x477/0x780 mm/slub.c:5719
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
batadv_hardif_add_interface net/batman-adv/hard-interface.c:874 [inline]
batadv_hard_if_event+0xb13/0x1550 net/batman-adv/hard-interface.c:958
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2229
call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
call_netdevice_notifiers net/core/dev.c:2281 [inline]
register_netdevice+0x182e/0x2270 net/core/dev.c:11332
ip6gre_newlink_common.constprop.0+0x14e/0x340 net/ipv6/ip6_gre.c:1956
ip6gre_newlink+0x17d/0x400 net/ipv6/ip6_gre.c:1989
rtnl_newlink_create net/core/rtnetlink.c:3833 [inline]
__rtnl_newlink net/core/rtnetlink.c:3950 [inline]
rtnl_newlink+0xc45/0x2000 net/core/rtnetlink.c:4065
rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6954
page last free pid 5850 tgid 5850 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
__free_frozen_pages+0x7df/0x1160 mm/page_alloc.c:2906
discard_slab mm/slub.c:3301 [inline]
__put_partials+0x130/0x170 mm/slub.c:3848
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:352
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4946 [inline]
slab_alloc_node mm/slub.c:5245 [inline]
__kmalloc_cache_noprof+0x274/0x780 mm/slub.c:5719
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
ref_tracker_alloc+0x18e/0x5b0 lib/ref_tracker.c:271
__netdev_tracker_alloc include/linux/netdevice.h:4375 [inline]
netdev_hold include/linux/netdevice.h:4404 [inline]
netdev_hold include/linux/netdevice.h:4399 [inline]
rx_queue_add_kobject net/core/net-sysfs.c:1257 [inline]
net_rx_queue_update_kobjects+0x334/0x770 net/core/net-sysfs.c:1322
register_queue_kobjects net/core/net-sysfs.c:2114 [inline]
netdev_register_kobject+0x290/0x3d0 net/core/net-sysfs.c:2362
register_netdevice+0x13dc/0x2270 net/core/dev.c:11294
team_newlink+0xb4/0x190 drivers/net/team/team_core.c:2213
rtnl_newlink_create net/core/rtnetlink.c:3833 [inline]
__rtnl_newlink net/core/rtnetlink.c:3950 [inline]
rtnl_newlink+0xc45/0x2000 net/core/rtnetlink.c:4065
rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6954
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1896
Memory state around the buggy address:
ffff888032e4e780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888032e4e800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888032e4e880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888032e4e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888032e4e980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:87 [inline]
BUG: KASAN: slab-use-after-free in do_raw_spin_lock+0x27f/0x2b0 kernel/locking/spinlock_debug.c:115
Read of size 8 at addr ffff888032e4e8d0 by task jfsCommit/111
CPU: 1 UID: 0 PID: 111 Comm: jfsCommit Tainted: G B syzkaller #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xcd/0x630 mm/kasan/report.c:482
kasan_report+0xe0/0x110 mm/kasan/report.c:595
debug_spin_lock_before kernel/locking/spinlock_debug.c:87 [inline]
do_raw_spin_lock+0x27f/0x2b0 kernel/locking/spinlock_debug.c:115
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0x42/0x60 kernel/locking/spinlock.c:162
__mutex_lock_common kernel/locking/mutex.c:612 [inline]
__mutex_lock+0x289/0x1060 kernel/locking/mutex.c:760
jfs_syncpt+0x2a/0xa0 fs/jfs/jfs_logmgr.c:1039
txEnd+0x30a/0x5a0 fs/jfs/jfs_txnmgr.c:550
txLazyCommit fs/jfs/jfs_txnmgr.c:2685 [inline]
jfs_lazycommit+0x783/0xb30 fs/jfs/jfs_txnmgr.c:2734
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x56d/0x730 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 10210:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:417
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
open_inline_log fs/jfs/jfs_logmgr.c:1159 [inline]
lmLogOpen+0x571/0x13c0 fs/jfs/jfs_logmgr.c:1069
jfs_mount_rw+0x2e9/0x6f0 fs/jfs/jfs_mount.c:257
jfs_fill_super+0xc46/0x1040 fs/jfs/super.c:532
get_tree_bdev_flags+0x38c/0x620 fs/super.c:1691
vfs_get_tree+0x8e/0x340 fs/super.c:1751
fc_mount fs/namespace.c:1208 [inline]
do_new_mount_fc fs/namespace.c:3651 [inline]
do_new_mount fs/namespace.c:3727 [inline]
path_mount+0x7b9/0x23a0 fs/namespace.c:4037
do_mount fs/namespace.c:4050 [inline]
__do_sys_mount fs/namespace.c:4238 [inline]
__se_sys_mount fs/namespace.c:4215 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4215
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 5845:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
__kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:587
kasan_save_free_info mm/kasan/kasan.h:406 [inline]
poison_slab_object mm/kasan/common.c:252 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:234 [inline]
slab_free_hook mm/slub.c:2514 [inline]
slab_free mm/slub.c:6566 [inline]
kfree+0x2b8/0x6d0 mm/slub.c:6773
lmLogClose+0x585/0x710 fs/jfs/jfs_logmgr.c:1460
jfs_umount+0x2f0/0x440 fs/jfs/jfs_umount.c:114
jfs_put_super+0x88/0x1d0 fs/jfs/super.c:194
generic_shutdown_super+0x156/0x390 fs/super.c:642
kill_block_super+0x3b/0x90 fs/super.c:1722
deactivate_locked_super+0xc1/0x1a0 fs/super.c:473
deactivate_super fs/super.c:506 [inline]
deactivate_super+0xde/0x100 fs/super.c:502
cleanup_mnt+0x225/0x450 fs/namespace.c:1327
task_work_run+0x150/0x240 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xec/0x130 kernel/entry/common.c:43
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x419/0x4e0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888032e4e800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 208 bytes inside of
freed 1024-byte region [ffff888032e4e800, ffff888032e4ec00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x32e48
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b026dc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b026dc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0000cb9201 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5841, tgid 5841 (syz-executor), ts 106932545124, free_ts 106894310892
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1850
prep_new_page mm/page_alloc.c:1858 [inline]
get_page_from_freelist+0x10a3/0x3a30 mm/page_alloc.c:3884
__alloc_frozen_pages_noprof+0x25f/0x2470 mm/page_alloc.c:5183
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:3030 [inline]
allocate_slab mm/slub.c:3203 [inline]
new_slab+0x24a/0x360 mm/slub.c:3257
___slab_alloc+0xdc4/0x1ae0 mm/slub.c:4627
__slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4746
__slab_alloc_node mm/slub.c:4822 [inline]
slab_alloc_node mm/slub.c:5233 [inline]
__kmalloc_cache_noprof+0x477/0x780 mm/slub.c:5719
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
batadv_hardif_add_interface net/batman-adv/hard-interface.c:874 [inline]
batadv_hard_if_event+0xb13/0x1550 net/batman-adv/hard-interface.c:958
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2229
call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
call_netdevice_notifiers net/core/dev.c:2281 [inline]
register_netdevice+0x182e/0x2270 net/core/dev.c:11332
ip6gre_newlink_common.constprop.0+0x14e/0x340 net/ipv6/ip6_gre.c:1956
ip6gre_newlink+0x17d/0x400 net/ipv6/ip6_gre.c:1989
rtnl_newlink_create net/core/rtnetlink.c:3833 [inline]
__rtnl_newlink net/core/rtnetlink.c:3950 [inline]
rtnl_newlink+0xc45/0x2000 net/core/rtnetlink.c:4065
rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6954
page last free pid 5850 tgid 5850 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
__free_frozen_pages+0x7df/0x1160 mm/page_alloc.c:2906
discard_slab mm/slub.c:3301 [inline]
__put_partials+0x130/0x170 mm/slub.c:3848
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:352
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4946 [inline]
slab_alloc_node mm/slub.c:5245 [inline]
__kmalloc_cache_noprof+0x274/0x780 mm/slub.c:5719
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
ref_tracker_alloc+0x18e/0x5b0 lib/ref_tracker.c:271
__netdev_tracker_alloc include/linux/netdevice.h:4375 [inline]
netdev_hold include/linux/netdevice.h:4404 [inline]
netdev_hold include/linux/netdevice.h:4399 [inline]
rx_queue_add_kobject net/core/net-sysfs.c:1257 [inline]
net_rx_queue_update_kobjects+0x334/0x770 net/core/net-sysfs.c:1322
register_queue_kobjects net/core/net-sysfs.c:2114 [inline]
netdev_register_kobject+0x290/0x3d0 net/core/net-sysfs.c:2362
register_netdevice+0x13dc/0x2270 net/core/dev.c:11294
team_newlink+0xb4/0x190 drivers/net/team/team_core.c:2213
rtnl_newlink_create net/core/rtnetlink.c:3833 [inline]
__rtnl_newlink net/core/rtnetlink.c:3950 [inline]
rtnl_newlink+0xc45/0x2000 net/core/rtnetlink.c:4065
rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6954
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1896
Memory state around the buggy address:
ffff888032e4e780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888032e4e800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888032e4e880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888032e4e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888032e4e980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:88 [inline]
BUG: KASAN: slab-use-after-free in do_raw_spin_lock+0x265/0x2b0 kernel/locking/spinlock_debug.c:115
Read of size 4 at addr ffff888032e4e8c8 by task jfsCommit/111
CPU: 1 UID: 0 PID: 111 Comm: jfsCommit Tainted: G B syzkaller #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xcd/0x630 mm/kasan/report.c:482
kasan_report+0xe0/0x110 mm/kasan/report.c:595
debug_spin_lock_before kernel/locking/spinlock_debug.c:88 [inline]
do_raw_spin_lock+0x265/0x2b0 kernel/locking/spinlock_debug.c:115
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0x42/0x60 kernel/locking/spinlock.c:162
__mutex_lock_common kernel/locking/mutex.c:612 [inline]
__mutex_lock+0x289/0x1060 kernel/locking/mutex.c:760
jfs_syncpt+0x2a/0xa0 fs/jfs/jfs_logmgr.c:1039
txEnd+0x30a/0x5a0 fs/jfs/jfs_txnmgr.c:550
txLazyCommit fs/jfs/jfs_txnmgr.c:2685 [inline]
jfs_lazycommit+0x783/0xb30 fs/jfs/jfs_txnmgr.c:2734
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x56d/0x730 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 10210:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:417
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
open_inline_log fs/jfs/jfs_logmgr.c:1159 [inline]
lmLogOpen+0x571/0x13c0 fs/jfs/jfs_logmgr.c:1069
jfs_mount_rw+0x2e9/0x6f0 fs/jfs/jfs_mount.c:257
jfs_fill_super+0xc46/0x1040 fs/jfs/super.c:532
get_tree_bdev_flags+0x38c/0x620 fs/super.c:1691
vfs_get_tree+0x8e/0x340 fs/super.c:1751
fc_mount fs/namespace.c:1208 [inline]
do_new_mount_fc fs/namespace.c:3651 [inline]
do_new_mount fs/namespace.c:3727 [inline]
path_mount+0x7b9/0x23a0 fs/namespace.c:4037
do_mount fs/namespace.c:4050 [inline]
__do_sys_mount fs/namespace.c:4238 [inline]
__se_sys_mount fs/namespace.c:4215 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4215
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 5845:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
__kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:587
kasan_save_free_info mm/kasan/kasan.h:406 [inline]
poison_slab_object mm/kasan/common.c:252 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:234 [inline]
slab_free_hook mm/slub.c:2514 [inline]
slab_free mm/slub.c:6566 [inline]
kfree+0x2b8/0x6d0 mm/slub.c:6773
lmLogClose+0x585/0x710 fs/jfs/jfs_logmgr.c:1460
jfs_umount+0x2f0/0x440 fs/jfs/jfs_umount.c:114
jfs_put_super+0x88/0x1d0 fs/jfs/super.c:194
generic_shutdown_super+0x156/0x390 fs/super.c:642
kill_block_super+0x3b/0x90 fs/super.c:1722
deactivate_locked_super+0xc1/0x1a0 fs/super.c:473
deactivate_super fs/super.c:506 [inline]
deactivate_super+0xde/0x100 fs/super.c:502
cleanup_mnt+0x225/0x450 fs/namespace.c:1327
task_work_run+0x150/0x240 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xec/0x130 kernel/entry/common.c:43
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x419/0x4e0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888032e4e800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 200 bytes inside of
freed 1024-byte region [ffff888032e4e800, ffff888032e4ec00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x32e48
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b026dc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b026dc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0000cb9201 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5841, tgid 5841 (syz-executor), ts 106932545124, free_ts 106894310892
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1850
prep_new_page mm/page_alloc.c:1858 [inline]
get_page_from_freelist+0x10a3/0x3a30 mm/page_alloc.c:3884
__alloc_frozen_pages_noprof+0x25f/0x2470 mm/page_alloc.c:5183
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:3030 [inline]
allocate_slab mm/slub.c:3203 [inline]
new_slab+0x24a/0x360 mm/slub.c:3257
___slab_alloc+0xdc4/0x1ae0 mm/slub.c:4627
__slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4746
__slab_alloc_node mm/slub.c:4822 [inline]
slab_alloc_node mm/slub.c:5233 [inline]
__kmalloc_cache_noprof+0x477/0x780 mm/slub.c:5719
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
batadv_hardif_add_interface net/batman-adv/hard-interface.c:874 [inline]
batadv_hard_if_event+0xb13/0x1550 net/batman-adv/hard-interface.c:958
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2229
call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
call_netdevice_notifiers net/core/dev.c:2281 [inline]
register_netdevice+0x182e/0x2270 net/core/dev.c:11332
ip6gre_newlink_common.constprop.0+0x14e/0x340 net/ipv6/ip6_gre.c:1956
ip6gre_newlink+0x17d/0x400 net/ipv6/ip6_gre.c:1989
rtnl_newlink_create net/core/rtnetlink.c:3833 [inline]
__rtnl_newlink net/core/rtnetlink.c:3950 [inline]
rtnl_newlink+0xc45/0x2000 net/core/rtnetlink.c:4065
rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6954
page last free pid 5850 tgid 5850 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
__free_frozen_pages+0x7df/0x1160 mm/page_alloc.c:2906
discard_slab mm/slub.c:3301 [inline]
__put_partials+0x130/0x170 mm/slub.c:3848
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:352
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4946 [inline]
slab_alloc_node mm/slub.c:5245 [inline]
__kmalloc_cache_noprof+0x274/0x780 mm/slub.c:5719
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
ref_tracker_alloc+0x18e/0x5b0 lib/ref_tracker.c:271
__netdev_tracker_alloc include/linux/netdevice.h:4375 [inline]
netdev_hold include/linux/netdevice.h:4404 [inline]
netdev_hold include/linux/netdevice.h:4399 [inline]
rx_queue_add_kobject net/core/net-sysfs.c:1257 [inline]
net_rx_queue_update_kobjects+0x334/0x770 net/core/net-sysfs.c:1322
register_queue_kobjects net/core/net-sysfs.c:2114 [inline]
netdev_register_kobject+0x290/0x3d0 net/core/net-sysfs.c:2362
register_netdevice+0x13dc/0x2270 net/core/dev.c:11294
team_newlink+0xb4/0x190 drivers/net/team/team_core.c:2213
rtnl_newlink_create net/core/rtnetlink.c:3833 [inline]
__rtnl_newlink net/core/rtnetlink.c:3950 [inline]
rtnl_newlink+0xc45/0x2000 net/core/rtnetlink.c:4065
rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6954
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1896
Memory state around the buggy address:
ffff888032e4e780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888032e4e800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888032e4e880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888032e4e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888032e4e980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
BUG: KASAN: slab-use-after-free in atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1300 [inline]
BUG: KASAN: slab-use-after-free in queued_spin_lock include/asm-generic/qspinlock.h:111 [inline]
BUG: KASAN: slab-use-after-free in do_raw_spin_lock+0x11d/0x2b0 kernel/locking/spinlock_debug.c:116
Write of size 4 at addr ffff888032e4e8c0 by task jfsCommit/111
CPU: 1 UID: 0 PID: 111 Comm: jfsCommit Tainted: G B syzkaller #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xcd/0x630 mm/kasan/report.c:482
kasan_report+0xe0/0x110 mm/kasan/report.c:595
check_region_inline mm/kasan/generic.c:194 [inline]
kasan_check_range+0x100/0x1b0 mm/kasan/generic.c:200
instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1300 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:111 [inline]
do_raw_spin_lock+0x11d/0x2b0 kernel/locking/spinlock_debug.c:116
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0x42/0x60 kernel/locking/spinlock.c:162
__mutex_lock_common kernel/locking/mutex.c:612 [inline]
__mutex_lock+0x289/0x1060 kernel/locking/mutex.c:760
jfs_syncpt+0x2a/0xa0 fs/jfs/jfs_logmgr.c:1039
txEnd+0x30a/0x5a0 fs/jfs/jfs_txnmgr.c:550
txLazyCommit fs/jfs/jfs_txnmgr.c:2685 [inline]
jfs_lazycommit+0x783/0xb30 fs/jfs/jfs_txnmgr.c:2734
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x56d/0x730 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 10210:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:417
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
open_inline_log fs/jfs/jfs_logmgr.c:1159 [inline]
lmLogOpen+0x571/0x13c0 fs/jfs/jfs_logmgr.c:1069
jfs_mount_rw+0x2e9/0x6f0 fs/jfs/jfs_mount.c:257
jfs_fill_super+0xc46/0x1040 fs/jfs/super.c:532
get_tree_bdev_flags+0x38c/0x620 fs/super.c:1691
vfs_get_tree+0x8e/0x340 fs/super.c:1751
fc_mount fs/namespace.c:1208 [inline]
do_new_mount_fc fs/namespace.c:3651 [inline]
do_new_mount fs/namespace.c:3727 [inline]
path_mount+0x7b9/0x23a0 fs/namespace.c:4037
do_mount fs/namespace.c:4050 [inline]
__do_sys_mount fs/namespace.c:4238 [inline]
__se_sys_mount fs/namespace.c:4215 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4215
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 5845:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
__kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:587
kasan_save_free_info mm/kasan/kasan.h:406 [inline]
poison_slab_object mm/kasan/common.c:252 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:234 [inline]
slab_free_hook mm/slub.c:2514 [inline]
slab_free mm/slub.c:6566 [inline]
kfree+0x2b8/0x6d0 mm/slub.c:6773
lmLogClose+0x585/0x710 fs/jfs/jfs_logmgr.c:1460
jfs_umount+0x2f0/0x440 fs/jfs/jfs_umount.c:114
jfs_put_super+0x88/0x1d0 fs/jfs/super.c:194
generic_shutdown_super+0x156/0x390 fs/super.c:642
kill_block_super+0x3b/0x90 fs/super.c:1722
deactivate_locked_super+0xc1/0x1a0 fs/super.c:473
deactivate_super fs/super.c:506 [inline]
deactivate_super+0xde/0x100 fs/super.c:502
cleanup_mnt+0x225/0x450 fs/namespace.c:1327
task_work_run+0x150/0x240 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xec/0x130 kernel/entry/common.c:43
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x419/0x4e0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888032e4e800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 192 bytes inside of
freed 1024-byte region [ffff888032e4e800, ffff888032e4ec00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x32e48
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b026dc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b026dc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0000cb9201 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5841, tgid 5841 (syz-executor), ts 106932545124, free_ts 106894310892
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1850
prep_new_page mm/page_alloc.c:1858 [inline]
get_page_from_freelist+0x10a3/0x3a30 mm/page_alloc.c:3884
__alloc_frozen_pages_noprof+0x25f/0x2470 mm/page_alloc.c:5183
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:3030 [inline]
allocate_slab mm/slub.c:3203 [inline]
new_slab+0x24a/0x360 mm/slub.c:3257
___slab_alloc+0xdc4/0x1ae0 mm/slub.c:4627
__slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4746
__slab_alloc_node mm/slub.c:4822 [inline]
slab_alloc_node mm/slub.c:5233 [inline]
__kmalloc_cache_noprof+0x477/0x780 mm/slub.c:5719
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
batadv_hardif_add_interface net/batman-adv/hard-interface.c:874 [inline]
batadv_hard_if_event+0xb13/0x1550 net/batman-adv/hard-interface.c:958
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2229
call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
call_netdevice_notifiers net/core/dev.c:2281 [inline]
register_netdevice+0x182e/0x2270 net/core/dev.c:11332
ip6gre_newlink_common.constprop.0+0x14e/0x340 net/ipv6/ip6_gre.c:1956
ip6gre_newlink+0x17d/0x400 net/ipv6/ip6_gre.c:1989
rtnl_newlink_create net/core/rtnetlink.c:3833 [inline]
__rtnl_newlink net/core/rtnetlink.c:3950 [inline]
rtnl_newlink+0xc45/0x2000 net/core/rtnetlink.c:4065
rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6954
page last free pid 5850 tgid 5850 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
__free_frozen_pages+0x7df/0x1160 mm/page_alloc.c:2906
discard_slab mm/slub.c:3301 [inline]
__put_partials+0x130/0x170 mm/slub.c:3848
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:352
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4946 [inline]
slab_alloc_node mm/slub.c:5245 [inline]
__kmalloc_cache_noprof+0x274/0x780 mm/slub.c:5719
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
ref_tracker_alloc+0x18e/0x5b0 lib/ref_tracker.c:271
__netdev_tracker_alloc include/linux/netdevice.h:4375 [inline]
netdev_hold include/linux/netdevice.h:4404 [inline]
netdev_hold include/linux/netdevice.h:4399 [inline]
rx_queue_add_kobject net/core/net-sysfs.c:1257 [inline]
net_rx_queue_update_kobjects+0x334/0x770 net/core/net-sysfs.c:1322
register_queue_kobjects net/core/net-sysfs.c:2114 [inline]
netdev_register_kobject+0x290/0x3d0 net/core/net-sysfs.c:2362
register_netdevice+0x13dc/0x2270 net/core/dev.c:11294
team_newlink+0xb4/0x190 drivers/net/team/team_core.c:2213
rtnl_newlink_create net/core/rtnetlink.c:3833 [inline]
__rtnl_newlink net/core/rtnetlink.c:3950 [inline]
rtnl_newlink+0xc45/0x2000 net/core/rtnetlink.c:4065
rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6954
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1896
Memory state around the buggy address:
ffff888032e4e780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888032e4e800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888032e4e880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888032e4e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888032e4e980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================