==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: use-after-free in atomic_inc include/linux/atomic/atomic-instrumented.h:181 [inline]
BUG: KASAN: use-after-free in kernfs_get+0x5c/0x90 fs/kernfs/dir.c:505
Write of size 4 at addr ffff888123cc0a28 by task kworker/0:2/291
CPU: 0 PID: 291 Comm: kworker/0:2 Not tainted 5.15.156-syzkaller-00821-g29d153aabd54 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Workqueue: events flush_stashed_error_work
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106
print_address_description+0x87/0x3b0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:427 [inline]
kasan_report+0x179/0x1c0 mm/kasan/report.c:444
kasan_check_range+0x293/0x2a0 mm/kasan/generic.c:189
__kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37
instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
atomic_inc include/linux/atomic/atomic-instrumented.h:181 [inline]
kernfs_get+0x5c/0x90 fs/kernfs/dir.c:505
sysfs_notify+0x9a/0xd0 fs/sysfs/file.c:190
ext4_notify_error_sysfs+0x25/0x30 fs/ext4/sysfs.c:516
flush_stashed_error_work+0x302/0x320
process_one_work+0x6bb/0xc10 kernel/workqueue.c:2325
worker_thread+0xad5/0x12a0 kernel/workqueue.c:2472
kthread+0x421/0x510 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300
Allocated by task 10052:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:433 [inline]
__kasan_slab_alloc+0xb1/0xe0 mm/kasan/common.c:466
kasan_slab_alloc include/linux/kasan.h:217 [inline]
slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550
slab_alloc_node mm/slub.c:3240 [inline]
slab_alloc mm/slub.c:3248 [inline]
kmem_cache_alloc+0xf5/0x200 mm/slub.c:3253
kmem_cache_zalloc include/linux/slab.h:723 [inline]
__kernfs_new_node+0xdb/0x700 fs/kernfs/dir.c:593
kernfs_new_node+0x130/0x230 fs/kernfs/dir.c:669
kernfs_create_dir_ns+0x44/0x130 fs/kernfs/dir.c:1017
sysfs_create_dir_ns+0x185/0x390 fs/sysfs/dir.c:59
create_dir lib/kobject.c:89 [inline]
kobject_add_internal+0x763/0xd90 lib/kobject.c:263
kobject_add_varg lib/kobject.c:398 [inline]
kobject_init_and_add+0x120/0x190 lib/kobject.c:481
ext4_register_sysfs+0xbf/0x2c0 fs/ext4/sysfs.c:529
ext4_fill_super+0x8a31/0x96e0 fs/ext4/super.c:4940
mount_bdev+0x282/0x3b0 fs/super.c:1387
ext4_mount+0x34/0x40 fs/ext4/super.c:6593
legacy_get_tree+0xf1/0x190 fs/fs_context.c:611
vfs_get_tree+0x88/0x290 fs/super.c:1517
do_new_mount+0x2ba/0xb30 fs/namespace.c:3005
path_mount+0x671/0x1070 fs/namespace.c:3335
do_mount fs/namespace.c:3348 [inline]
__do_sys_mount fs/namespace.c:3556 [inline]
__se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3533
__x64_sys_mount+0xbf/0xd0 fs/namespace.c:3533
x64_sys_call+0x49d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
Freed by task 286:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:45
kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
kasan_slab_free include/linux/kasan.h:193 [inline]
slab_free_hook mm/slub.c:1723 [inline]
slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749
slab_free mm/slub.c:3519 [inline]
kmem_cache_free+0x116/0x2e0 mm/slub.c:3535
kernfs_put+0x392/0x520 fs/kernfs/dir.c:547
sysfs_put include/linux/sysfs.h:641 [inline]
__kobject_del+0x10f/0x300 lib/kobject.c:629
kobject_del+0x45/0x60 lib/kobject.c:651
ext4_unregister_sysfs+0x91/0xa0 fs/ext4/sysfs.c:563
ext4_put_super+0x80/0xd20 fs/ext4/super.c:1182
generic_shutdown_super+0x157/0x2e0 fs/super.c:475
kill_block_super+0x7e/0xe0 fs/super.c:1414
deactivate_locked_super+0xad/0x110 fs/super.c:335
deactivate_super+0xbe/0xf0 fs/super.c:366
cleanup_mnt+0x45c/0x510 fs/namespace.c:1143
__cleanup_mnt+0x19/0x20 fs/namespace.c:1150
task_work_run+0x129/0x190 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0xc4/0xe0 kernel/entry/common.c:181
exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:307
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
The buggy address belongs to the object at ffff888123cc0a28
which belongs to the cache kernfs_node_cache of size 136
The buggy address is located 0 bytes inside of
136-byte region [ffff888123cc0a28, ffff888123cc0ab0)
The buggy address belongs to the page:
page:ffffea00048f3000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x123cc0
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea000490bf40 0000000900000009 ffff8881001cd500
raw: 0000000000000000 0000000000140014 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 287, ts 19443046984, free_ts 0
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605
prep_new_page+0x1b/0x110 mm/page_alloc.c:2611
get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485
__alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5779
allocate_slab mm/slub.c:1932 [inline]
new_slab+0x9a/0x4e0 mm/slub.c:1995
___slab_alloc+0x39e/0x830 mm/slub.c:3028
__slab_alloc+0x4a/0x90 mm/slub.c:3115
slab_alloc_node mm/slub.c:3206 [inline]
slab_alloc mm/slub.c:3248 [inline]
kmem_cache_alloc+0x134/0x200 mm/slub.c:3253
kmem_cache_zalloc include/linux/slab.h:723 [inline]
__kernfs_new_node+0xdb/0x700 fs/kernfs/dir.c:593
kernfs_new_node+0x130/0x230 fs/kernfs/dir.c:669
__kernfs_create_file+0x4a/0x270 fs/kernfs/file.c:987
sysfs_add_file_mode_ns+0x273/0x320 fs/sysfs/file.c:317
create_files fs/sysfs/group.c:64 [inline]
internal_create_group+0x573/0xf00 fs/sysfs/group.c:149
internal_create_groups fs/sysfs/group.c:189 [inline]
sysfs_create_groups+0x5b/0x130 fs/sysfs/group.c:215
create_dir lib/kobject.c:100 [inline]
kobject_add_internal+0x8ce/0xd90 lib/kobject.c:263
kobject_add_varg lib/kobject.c:398 [inline]
kobject_init_and_add+0x120/0x190 lib/kobject.c:481
page_owner free stack trace missing
Memory state around the buggy address:
ffff888123cc0900: 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 00
ffff888123cc0980: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc
>ffff888123cc0a00: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb
^
ffff888123cc0a80: fb fb fb fb fb fb fc fc fc fc fc fc fc fc 00 00
ffff888123cc0b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
==================================================================
general protection fault, probably for non-canonical address 0xf577fc260000002d: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0xabc0013000000168-0xabc001300000016f]
CPU: 0 PID: 291 Comm: kworker/0:2 Tainted: G B 5.15.156-syzkaller-00821-g29d153aabd54 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Workqueue: events flush_stashed_error_work
RIP: 0010:kernfs_root fs/kernfs/kernfs-internal.h:50 [inline]
RIP: 0010:kernfs_find_and_get_ns+0x52/0x110 fs/kernfs/dir.c:884
Code: 08 48 89 f8 48 c1 e8 03 42 80 3c 30 00 74 05 e8 64 39 d5 ff 49 8b 5d 08 48 85 db 49 0f 44 dd 48 83 c3 50 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 3f 39 d5 ff 4c 8b 33 49 83 c6 68
RSP: 0018:ffffc90000a77c58 EFLAGS: 00010a07
RAX: 157800260000002d RBX: abc001300000016e RCX: ffffffff81dd73ec
RDX: 0000000000000000 RSI: 0000000000000292 RDI: ffff888123cc0a30
RBP: ffffc90000a77c80 R08: ffffffff8141971b R09: 0000000000000003
R10: fffffbfff0e99c4c R11: dffffc0000000001 R12: ffffffff858effa0
R13: ffff888123cc0a28 R14: dffffc0000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f55dfd91f98 CR3: 000000010e551000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
kernfs_find_and_get include/linux/kernfs.h:574 [inline]
sysfs_notify+0x73/0xd0 fs/sysfs/file.c:193
ext4_notify_error_sysfs+0x25/0x30 fs/ext4/sysfs.c:516
flush_stashed_error_work+0x302/0x320
process_one_work+0x6bb/0xc10 kernel/workqueue.c:2325
worker_thread+0xad5/0x12a0 kernel/workqueue.c:2472
kthread+0x421/0x510 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300
Modules linked in:
---[ end trace 20c0b5d24d098df6 ]---
RIP: 0010:kernfs_root fs/kernfs/kernfs-internal.h:50 [inline]
RIP: 0010:kernfs_find_and_get_ns+0x52/0x110 fs/kernfs/dir.c:884
Code: 08 48 89 f8 48 c1 e8 03 42 80 3c 30 00 74 05 e8 64 39 d5 ff 49 8b 5d 08 48 85 db 49 0f 44 dd 48 83 c3 50 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 3f 39 d5 ff 4c 8b 33 49 83 c6 68
RSP: 0018:ffffc90000a77c58 EFLAGS: 00010a07
RAX: 157800260000002d RBX: abc001300000016e RCX: ffffffff81dd73ec
RDX: 0000000000000000 RSI: 0000000000000292 RDI: ffff888123cc0a30
RBP: ffffc90000a77c80 R08: ffffffff8141971b R09: 0000000000000003
R10: fffffbfff0e99c4c R11: dffffc0000000001 R12: ffffffff858effa0
R13: ffff888123cc0a28 R14: dffffc0000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe2a03ff08 CR3: 000000012c03f000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 08 48 89 or %cl,-0x77(%rax)
3: f8 clc
4: 48 c1 e8 03 shr $0x3,%rax
8: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1)
d: 74 05 je 0x14
f: e8 64 39 d5 ff call 0xffd53978
14: 49 8b 5d 08 mov 0x8(%r13),%rbx
18: 48 85 db test %rbx,%rbx
1b: 49 0f 44 dd cmove %r13,%rbx
1f: 48 83 c3 50 add $0x50,%rbx
23: 48 89 d8 mov %rbx,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 48 89 df mov %rbx,%rdi
34: e8 3f 39 d5 ff call 0xffd53978
39: 4c 8b 33 mov (%rbx),%r14
3c: 49 83 c6 68 add $0x68,%r14