==================================================================
BUG: KASAN: use-after-free in rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88802b18142a by task syz.3.575/7236
CPU: 1 PID: 7236 Comm: syz.3.575 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
print_address_description+0x60/0x2d0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0xdf/0x130 mm/kasan/report.c:451
rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648
expire_timers kernel/time/timer.c:1699 [inline]
__run_timers+0x53e/0x800 kernel/time/timer.c:1970
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983
handle_softirqs+0x339/0x830 kernel/softirq.c:576
__do_softirq kernel/softirq.c:610 [inline]
invoke_softirq kernel/softirq.c:450 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xbc/0x120 kernel/locking/spinlock.c:194
Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 2f 8a 8c f7 65 8b 05 d0 97 3c 76 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc9000320f200 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a02 RCX: d1cd40ec2a321600
RDX: dffffc0000000000 RSI: ffffffff8a2b2780 RDI: 0000000000000001
RBP: ffffc9000320f290 R08: ffffffff901d42cf R09: 1ffffffff203a859
R10: dffffc0000000000 R11: fffffbfff203a85a R12: dffffc0000000000
R13: ffffffff8c322f00 R14: ffffffff8c323360 R15: 1ffff92000641e40
rcu_report_unblock_qs_rnp kernel/rcu/tree.c:2275 [inline]
rcu_preempt_deferred_qs_irqrestore+0x9dd/0xc30 kernel/rcu/tree_plugin.h:552
rcu_read_unlock_special+0x3dd/0x4a0 kernel/rcu/tree_plugin.h:673
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
rcu_read_unlock include/linux/rcupdate.h:772 [inline]
hctx_unlock+0x10d/0x130 block/blk-mq.c:699
blk_mq_try_issue_directly+0x232/0x270 block/blk-mq.c:2108
blk_mq_submit_bio+0xfa1/0x1820 block/blk-mq.c:-1
__submit_bio+0x7d1/0x820 block/blk-core.c:917
__submit_bio_noacct_mq block/blk-core.c:997 [inline]
submit_bio_noacct+0x6b0/0x800 block/blk-core.c:1027
submit_bio+0x2c1/0x560 block/blk-core.c:1089
submit_bh fs/buffer.c:3062 [inline]
__bread_slow fs/buffer.c:1180 [inline]
__bread_gfp+0x1ae/0x380 fs/buffer.c:1384
udf_check_vsd fs/udf/super.c:745 [inline]
udf_load_vrs+0x419/0xad0 fs/udf/super.c:2024
udf_fill_super+0x6bd/0x1960 fs/udf/super.c:2220
mount_bdev+0x287/0x3c0 fs/super.c:1400
legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x24a/0xa40 fs/namespace.c:3034
do_mount fs/namespace.c:3377 [inline]
__do_sys_mount fs/namespace.c:3585 [inline]
__se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3562
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f72a813fa8a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f72a6397e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f72a6397ee0 RCX: 00007f72a813fa8a
RDX: 0000200000000000 RSI: 00002000000094c0 RDI: 00007f72a6397ea0
RBP: 0000200000000000 R08: 00007f72a6397ee0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00002000000094c0
R13: 00007f72a6397ea0 R14: 0000000000000c25 R15: 0000200000001940
Allocated by task 5256:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
__kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522
kmalloc include/linux/slab.h:607 [inline]
rose_add_node+0x227/0xdb0 net/rose/rose_route.c:85
rose_rt_ioctl+0xa2b/0xe70 net/rose/rose_route.c:738
rose_ioctl+0x2a7/0x7d0 net/rose/af_rose.c:1372
sock_do_ioctl+0xfb/0x320 net/socket.c:1147
sock_ioctl+0x4d2/0x710 net/socket.c:1266
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
Freed by task 7119:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1710 [inline]
slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736
slab_free mm/slub.c:3504 [inline]
kfree+0xef/0x2a0 mm/slub.c:4564
rose_rt_device_down+0x4e2/0x530 net/rose/rose_route.c:515
rose_device_event+0x606/0x6c0 net/rose/af_rose.c:247
notifier_call_chain kernel/notifier.c:83 [inline]
raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391
call_netdevice_notifiers_extack net/core/dev.c:2074 [inline]
call_netdevice_notifiers net/core/dev.c:2088 [inline]
dev_close_many+0x29f/0x400 net/core/dev.c:1663
dev_close+0x154/0x210 net/core/dev.c:1685
bpq_device_event+0x2f4/0x9c0 drivers/net/hamradio/bpqether.c:548
notifier_call_chain kernel/notifier.c:83 [inline]
raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391
call_netdevice_notifiers_extack net/core/dev.c:2074 [inline]
call_netdevice_notifiers net/core/dev.c:2088 [inline]
dev_close_many+0x29f/0x400 net/core/dev.c:1663
dev_close+0x154/0x210 net/core/dev.c:1685
bond_setup_by_slave+0x61/0x3a0 drivers/net/bonding/bond_main.c:1474
bond_enslave+0x8bb/0x3c50 drivers/net/bonding/bond_main.c:1864
bond_do_ioctl+0x2b2/0x920 drivers/net/bonding/bond_main.c:4248
dev_ifsioc+0xb43/0xd50 net/core/dev_ioctl.c:404
dev_ioctl+0x545/0xe30 net/core/dev_ioctl.c:572
sock_do_ioctl+0x245/0x320 net/socket.c:1161
sock_ioctl+0x4d2/0x710 net/socket.c:1266
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
Last potentially related work creation:
kasan_save_stack+0x35/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348
kvfree_call_rcu+0x105/0x7d0 kernel/rcu/tree.c:3600
net_assign_generic net/core/net_namespace.c:117 [inline]
ops_init+0x2dc/0x600 net/core/net_namespace.c:132
__register_pernet_operations net/core/net_namespace.c:1203 [inline]
register_pernet_operations+0x2af/0x610 net/core/net_namespace.c:1276
register_pernet_subsys+0x24/0x40 net/core/net_namespace.c:1317
xt_init+0x36d/0x3e0 net/netfilter/x_tables.c:2003
do_one_initcall+0x272/0x730 init/main.c:1316
do_initcall_level+0x137/0x1f0 init/main.c:1389
do_initcalls+0x4b/0x90 init/main.c:1405
kernel_init_freeable+0x3e9/0x570 init/main.c:1629
kernel_init+0x19/0x1b0 init/main.c:1520
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
The buggy address belongs to the object at ffff88802b181400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
512-byte region [ffff88802b181400, ffff88802b181600)
The buggy address belongs to the page:
page:ffffea0000ac6000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88802b180c00 pfn:0x2b180
head:ffffea0000ac6000 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001809708 ffffea000097a308 ffff888016c41c80
raw: ffff88802b180c00 000000000010000d 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 20083190228, free_ts 0
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x1bbd/0x1ca0 mm/page_alloc.c:4192
__alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501
alloc_page_interleave+0x24/0x1e0 mm/mempolicy.c:2031
alloc_slab_page mm/slub.c:1780 [inline]
allocate_slab mm/slub.c:1917 [inline]
new_slab+0xc0/0x4b0 mm/slub.c:1980
___slab_alloc+0x80a/0xdd0 mm/slub.c:3013
__slab_alloc mm/slub.c:3100 [inline]
slab_alloc_node mm/slub.c:3191 [inline]
slab_alloc mm/slub.c:3233 [inline]
__kmalloc+0x1cd/0x330 mm/slub.c:4408
kmalloc include/linux/slab.h:612 [inline]
kzalloc include/linux/slab.h:738 [inline]
net_alloc_generic net/core/net_namespace.c:77 [inline]
net_assign_generic net/core/net_namespace.c:97 [inline]
ops_init+0x203/0x600 net/core/net_namespace.c:132
__register_pernet_operations net/core/net_namespace.c:1203 [inline]
register_pernet_operations+0x2af/0x610 net/core/net_namespace.c:1276
register_pernet_subsys+0x24/0x40 net/core/net_namespace.c:1317
nf_conntrack_standalone_init+0x7a/0x100 net/netfilter/nf_conntrack_standalone.c:1240
do_one_initcall+0x272/0x730 init/main.c:1316
do_initcall_level+0x137/0x1f0 init/main.c:1389
do_initcalls+0x4b/0x90 init/main.c:1405
kernel_init_freeable+0x3e9/0x570 init/main.c:1629
kernel_init+0x19/0x1b0 init/main.c:1520
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
page_owner free stack trace missing
Memory state around the buggy address:
ffff88802b181300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88802b181380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88802b181400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802b181480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802b181500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: c7 44 24 20 00 00 00 movl $0x0,0x20(%rsp)
7: 00
8: 9c pushf
9: 8f 44 24 20 pop 0x20(%rsp)
d: f7 44 24 20 00 02 00 testl $0x200,0x20(%rsp)
14: 00
15: 41 c6 04 07 f8 movb $0xf8,(%r15,%rax,1)
1a: 75 4b jne 0x67
1c: f7 c3 00 02 00 00 test $0x200,%ebx
22: 74 01 je 0x25
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 2f 8a 8c f7 call 0xf78c8a5e <-- trapping instruction
2f: 65 8b 05 d0 97 3c 76 mov %gs:0x763c97d0(%rip),%eax # 0x763c9806
36: 85 c0 test %eax,%eax
38: 74 3c je 0x76
3a: 48 rex.W
3b: c7 .byte 0xc7
3c: 04 24 add $0x24,%al
3e: 0e (bad)
3f: 36 ss