==================================================================
BUG: KASAN: use-after-free in __mutex_waiter_is_first kernel/locking/mutex.c:197 [inline]
BUG: KASAN: use-after-free in __mutex_lock_common+0xbec/0x21a0 kernel/locking/mutex.c:681
Read of size 8 at addr ffff0000de66f908 by task jfsCommit/93
CPU: 0 PID: 93 Comm: jfsCommit Not tainted 6.1.131-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:316 [inline]
print_report+0x174/0x4c0 mm/kasan/report.c:427
kasan_report+0xd4/0x130 mm/kasan/report.c:531
__asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351
__mutex_waiter_is_first kernel/locking/mutex.c:197 [inline]
__mutex_lock_common+0xbec/0x21a0 kernel/locking/mutex.c:681
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
jfs_syncpt+0x30/0x98 fs/jfs/jfs_logmgr.c:1039
txEnd+0x2ec/0x558 fs/jfs/jfs_txnmgr.c:549
txLazyCommit fs/jfs/jfs_txnmgr.c:2684 [inline]
jfs_lazycommit+0x4c4/0x988 fs/jfs/jfs_txnmgr.c:2732
kthread+0x250/0x2d8 kernel/kthread.c:376
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864
Allocated by task 5745:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383
kasan_kmalloc include/linux/kasan.h:211 [inline]
kmalloc_trace+0x7c/0x94 mm/slab_common.c:1031
kmalloc include/linux/slab.h:563 [inline]
kzalloc include/linux/slab.h:699 [inline]
open_inline_log fs/jfs/jfs_logmgr.c:1159 [inline]
lmLogOpen+0x290/0xdb0 fs/jfs/jfs_logmgr.c:1069
jfs_mount_rw+0xe4/0x57c fs/jfs/jfs_mount.c:253
jfs_fill_super+0x4f0/0x9f0 fs/jfs/super.c:565
mount_bdev+0x274/0x370 fs/super.c:1443
jfs_do_mount+0x44/0x58 fs/jfs/super.c:670
legacy_get_tree+0xd4/0x16c fs/fs_context.c:632
vfs_get_tree+0x90/0x274 fs/super.c:1573
do_new_mount+0x278/0x8fc fs/namespace.c:3056
path_mount+0x590/0xe5c fs/namespace.c:3386
do_mount fs/namespace.c:3399 [inline]
__do_sys_mount fs/namespace.c:3607 [inline]
__se_sys_mount fs/namespace.c:3584 [inline]
__arm64_sys_mount+0x498/0x588 fs/namespace.c:3584
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Freed by task 4305:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516
____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236
__kasan_slab_free+0x18/0x28 mm/kasan/common.c:244
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1724 [inline]
slab_free_freelist_hook mm/slub.c:1750 [inline]
slab_free mm/slub.c:3661 [inline]
__kmem_cache_free+0x2c0/0x4b4 mm/slub.c:3674
kfree+0xcc/0x1b8 mm/slab_common.c:988
lmLogClose+0x270/0x4d8 fs/jfs/jfs_logmgr.c:-1
jfs_umount+0x24c/0x338 fs/jfs/jfs_umount.c:116
jfs_put_super+0x90/0x188 fs/jfs/super.c:194
generic_shutdown_super+0x130/0x328 fs/super.c:501
kill_block_super+0x70/0xdc fs/super.c:1470
deactivate_locked_super+0xac/0x124 fs/super.c:332
deactivate_super+0xf0/0x110 fs/super.c:363
cleanup_mnt+0x394/0x41c fs/namespace.c:1186
__cleanup_mnt+0x20/0x30 fs/namespace.c:1193
task_work_run+0x240/0x2f0 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
do_notify_resume+0x2080/0x2cb8 arch/arm64/kernel/signal.c:1132
prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
The buggy address belongs to the object at ffff0000de66f800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 264 bytes inside of
1024-byte region [ffff0000de66f800, ffff0000de66fc00)
The buggy address belongs to the physical page:
page:000000009d2ddb6f refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11e668
head:000000009d2ddb6f order:3 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 fffffc000343ce00 dead000000000002 ffff0000c0002780
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff0000de66f800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff0000de66f880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000de66f900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff0000de66f980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff0000de66fa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Unable to handle kernel paging request at virtual address dfff800000000006
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
Mem abort info:
ESR = 0x0000000096000006
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x06: level 2 translation fault
Data abort info:
ISV = 0, ISS = 0x00000006
CM = 0, WnR = 0
[dfff800000000006] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 93 Comm: jfsCommit Tainted: G B 6.1.131-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline]
pc : lmLogSync+0xf0/0x97c fs/jfs/jfs_logmgr.c:935
lr : write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline]
lr : lmLogSync+0xe4/0x97c fs/jfs/jfs_logmgr.c:935
sp : ffff80001dee7b20
x29: ffff80001dee7bf0 x28: ffff800020902000 x27: dfff800000000000
x26: dfff800000000000 x25: 0000000000000003 x24: 1ffff00002c17700
x23: 0000000000000002 x22: 0000000000000030 x21: ffff80001dee7b60
x20: ffff0000cfd2b2e8 x19: ffff0000de66f800 x18: 0000000000000140
x17: 0000000000000000 x16: ffff800012275c40 x15: 0000000000000000
x14: 000000001232404c x13: ffff700003bdcf68 x12: ffff700003bdcf70
x11: 0000000000ff0100 x10: 0000000000000000 x9 : ffff80001cd859d0
x8 : 0000000000000006 x7 : 0000000000000000 x6 : ffff800008279314
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800009a54ff4
x2 : 0000000000000000 x1 : 0000000000000008 x0 : 0000000000000000
Call trace:
write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline]
lmLogSync+0xf0/0x97c fs/jfs/jfs_logmgr.c:935
jfs_syncpt+0x74/0x98 fs/jfs/jfs_logmgr.c:1041
txEnd+0x2ec/0x558 fs/jfs/jfs_txnmgr.c:549
txLazyCommit fs/jfs/jfs_txnmgr.c:2684 [inline]
jfs_lazycommit+0x4c4/0x988 fs/jfs/jfs_txnmgr.c:2732
kthread+0x250/0x2d8 kernel/kthread.c:376
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864
Code: 97bc8ad4 f94002c8 9100c116 d343fec8 (387b6908)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: 97bc8ad4 bl 0xfffffffffef22b50
4: f94002c8 ldr x8, [x22]
8: 9100c116 add x22, x8, #0x30
c: d343fec8 lsr x8, x22, #3
* 10: 387b6908 ldrb w8, [x8, x27] <-- trapping instruction