==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:71 [inline]
BUG: KASAN: use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
BUG: KASAN: use-after-free in kernfs_get+0x21/0x90 fs/kernfs/dir.c:504
Read of size 4 at addr ffff8881207c4640 by task kworker/1:27/4026
CPU: 1 PID: 4026 Comm: kworker/1:27 Not tainted 5.15.151-syzkaller-00415-gdb06c48ab67e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: events flush_stashed_error_work
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x151/0x1b7 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_read+0x11/0x20 mm/kasan/shadow.c:31
instrument_atomic_read include/linux/instrumented.h:71 [inline]
atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
kernfs_get+0x21/0x90 fs/kernfs/dir.c:504
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:298
Allocated by task 10129:
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:6581
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
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
Freed by task 9260:
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:175
exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:301
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x61/0xcb
The buggy address belongs to the object at ffff8881207c4640
which belongs to the cache kernfs_node_cache of size 136
The buggy address is located 0 bytes inside of
136-byte region [ffff8881207c4640, ffff8881207c46c8)
The buggy address belongs to the page:
page:ffffea000481f100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1207c4
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea00043ce8c0 0000000a0000000a ffff8881001bed80
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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 7270, ts 328289369102, free_ts 150597845337
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2604
prep_new_page+0x1b/0x110 mm/page_alloc.c:2610
get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4484
__alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5776
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
sysfs_merge_group+0x1fe/0x450 fs/sysfs/group.c:343
dpm_sysfs_add+0xec/0x2b0 drivers/base/power/sysfs.c:707
device_add+0x6df/0xf10 drivers/base/core.c:3361
netdev_register_kobject+0x177/0x320 net/core/net-sysfs.c:2014
page last free stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
free_pages_prepare mm/page_alloc.c:1471 [inline]
free_pcp_prepare mm/page_alloc.c:1543 [inline]
free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3533
free_unref_page+0xe8/0x750 mm/page_alloc.c:3615
free_the_page mm/page_alloc.c:804 [inline]
__free_pages+0x61/0xf0 mm/page_alloc.c:5852
__vunmap+0x7bc/0x8f0 mm/vmalloc.c:2652
__vfree mm/vmalloc.c:2700 [inline]
vfree+0x7f/0xb0 mm/vmalloc.c:2731
kcov_put kernel/kcov.c:408 [inline]
kcov_close+0x2b/0x50 kernel/kcov.c:510
__fput+0x3fe/0x910 fs/file_table.c:280
____fput+0x15/0x20 fs/file_table.c:308
task_work_run+0x129/0x190 kernel/task_work.c:164
exit_task_work include/linux/task_work.h:32 [inline]
do_exit+0xc48/0x2ca0 kernel/exit.c:878
do_group_exit+0x141/0x310 kernel/exit.c:1000
get_signal+0x7a3/0x1630 kernel/signal.c:2896
arch_do_signal_or_restart+0xbd/0x1680 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0xa0/0xe0 kernel/entry/common.c:172
exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:301
Memory state around the buggy address:
ffff8881207c4500: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc 00
ffff8881207c4580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881207c4600: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
^
ffff8881207c4680: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc
ffff8881207c4700: fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
general protection fault, probably for non-canonical address 0xfa23fc260000048f: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0xd120013000002478-0xd12001300000247f]
CPU: 1 PID: 4026 Comm: kworker/1:27 Tainted: G B 5.15.151-syzkaller-00415-gdb06c48ab67e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
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 36 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 36 d5 ff 4c 8b 33 49 83 c6 68
RSP: 0018:ffffc900010b7c58 EFLAGS: 00010a03
RAX: 1a2400260000048f RBX: d12001300000247c RCX: ffffffff81dd3b0c
RDX: 0000000000000000 RSI: 0000000000000292 RDI: ffff8881207c4648
RBP: ffffc900010b7c80 R08: dffffc0000000000 R09: 0000000000000003
R10: ffffed10240f88c8 R11: dffffc0000000001 R12: ffffffff856ee460
R13: ffff8881207c4640 R14: dffffc0000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32f14ff8 CR3: 000000012cdd0000 CR4: 00000000003506a0
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:298
Modules linked in:
---[ end trace 336d06764ba65754 ]---
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 36 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 36 d5 ff 4c 8b 33 49 83 c6 68
RSP: 0018:ffffc900010b7c58 EFLAGS: 00010a03
RAX: 1a2400260000048f RBX: d12001300000247c RCX: ffffffff81dd3b0c
RDX: 0000000000000000 RSI: 0000000000000292 RDI: ffff8881207c4648
RBP: ffffc900010b7c80 R08: dffffc0000000000 R09: 0000000000000003
R10: ffffed10240f88c8 R11: dffffc0000000001 R12: ffffffff856ee460
R13: ffff8881207c4640 R14: dffffc0000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32f11ff8 CR3: 00000001262c7000 CR4: 00000000003506a0
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 36 d5 ff call 0xffd53678
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 36 d5 ff call 0xffd53678
39: 4c 8b 33 mov (%rbx),%r14
3c: 49 83 c6 68 add $0x68,%r14