syzbot
WARNING: proc registration bug in jbd2_journal_destroy
Status:
moderation: reported on 2026/08/02 13:51
Subsystems:
ext4
Labels:
prio:low
[Documentation on labels]
Reported-by: syzbot+c9c72dac0af06fc4c94e@syzkaller.appspotmail.com
First crash: 79d, last: 1d06h
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Last patch testing requests (1)
Sample crash report:
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f270359f7ca
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:00007f2704387e18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f2704387ea0 RCX: 00007f270359f7ca
RDX: 000020000003e000 RSI: 000020000003e040 RDI: 00007f2704387e60
RBP: 000020000003e000 R08: 00007f2704387ea0 R09: 00000000000008c0
R10: 00000000000008c0 R11: 0000000000000246 R12: 000020000003e040
R13: 00007f2704387e60 R14: 0000000000004434 R15: 000020000003e080
</TASK>
JBD2: Ignoring recovery information on journal
jbd2_journal_bmap: journal block not found at offset 32 on loop0-75
JBD2: bad block at offset 32
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 5, space 0, times 9992
CPU: 0 UID: 0 PID: 5330 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
fail_dump lib/fault-inject.c:73 [inline]
should_fail_ex+0x410/0x560 lib/fault-inject.c:174
should_failslab+0xa8/0x100 mm/failslab.c:46
slab_pre_alloc_hook mm/slub.c:4638 [inline]
slab_alloc_node mm/slub.c:4974 [inline]
__do_kmalloc_node mm/slub.c:5413 [inline]
__kmalloc_node_track_caller_noprof+0xfb/0x720 mm/slub.c:5545
__kmemdup_nul mm/util.c:64 [inline]
kstrdup+0x42/0x100 mm/util.c:84
__kernfs_new_node+0xa9/0x980 fs/kernfs/dir.c:661
kernfs_new_node fs/kernfs/dir.c:751 [inline]
kernfs_create_dir_ns+0xfe/0x230 fs/kernfs/dir.c:1120
sysfs_create_dir_ns+0x12f/0x2a0 fs/sysfs/dir.c:59
create_dir lib/kobject.c:73 [inline]
kobject_add_internal+0x622/0xcd0 lib/kobject.c:240
kset_register+0x161/0x230 lib/kobject.c:874
kset_create_and_add+0x12d/0x170 lib/kobject.c:1015
ocfs2_fill_super+0x3971/0x6840 fs/ocfs2/super.c:1095
get_tree_bdev_flags+0x430/0x4f0 fs/super.c:1872
vfs_get_tree+0x92/0x2a0 fs/super.c:1932
fc_mount fs/namespace.c:1278 [inline]
do_new_mount_fc fs/namespace.c:3885 [inline]
do_new_mount+0x325/0xb00 fs/namespace.c:3961
do_mount fs/namespace.c:4325 [inline]
__do_sys_mount fs/namespace.c:4543 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4520
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f270359f7ca
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:00007f2704387e18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f2704387ea0 RCX: 00007f270359f7ca
RDX: 000020000003e000 RSI: 000020000003e040 RDI: 00007f2704387e60
RBP: 000020000003e000 R08: 00007f2704387ea0 R09: 00000000000008c0
R10: 00000000000008c0 R11: 0000000000000246 R12: 000020000003e040
R13: 00007f2704387e60 R14: 0000000000004434 R15: 000020000003e080
</TASK>
kobject: kobject_add_internal failed for loop0 (error: -12 parent: ocfs2)
(syz.0.0,5330,0):ocfs2_fill_super:1099 ERROR: Unable to create device kset loop0.
------------[ cut here ]------------
name 'info'
WARNING: fs/proc/generic.c:741 at remove_proc_entry+0x35a/0x690 fs/proc/generic.c:741, CPU#0: syz.0.0/5330
Modules linked in:
CPU: 0 UID: 0 PID: 5330 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:remove_proc_entry+0x35f/0x690 fs/proc/generic.c:741
Code: ff e9 14 ff ff ff e8 f0 55 4e ff eb 05 e8 e9 55 4e ff 48 c7 c7 80 0e f3 8f e8 7d bc 73 09 48 8d 3d 86 17 07 0f 48 8b 74 24 08 <67> 48 0f b9 3a 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d e9 c9 fe
RSP: 0018:ffffc9000e576e28 EFLAGS: 00010286
RAX: 8000000000000000 RBX: ffff8880418e9a00 RCX: ffffffff9ba00501
RDX: ffffc9000ee7a001 RSI: ffffffff8c2823a0 RDI: ffffffff9180e340
RBP: 0000000000000004 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001caedb4 R12: 0000000000000000
R13: ffffffff8c2823a0 R14: ffff8880418e9ab0 R15: dffffc0000000000
FS: 00007f27043886c0(0000) GS:ffff88808b0b4000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563c3bb9e6e5 CR3: 000000004029c000 CR4: 0000000000352ef0
Call Trace:
<TASK>
jbd2_stats_proc_exit fs/jbd2/journal.c:1232 [inline]
jbd2_journal_destroy+0x64b/0x7f0 fs/jbd2/journal.c:2176
ocfs2_journal_shutdown+0x515/0xb70 fs/ocfs2/journal.c:1107
ocfs2_dismount_volume+0x388/0x820 fs/ocfs2/super.c:1853
ocfs2_fill_super+0x3f1b/0x6840 fs/ocfs2/super.c:1166
get_tree_bdev_flags+0x430/0x4f0 fs/super.c:1872
vfs_get_tree+0x92/0x2a0 fs/super.c:1932
fc_mount fs/namespace.c:1278 [inline]
do_new_mount_fc fs/namespace.c:3885 [inline]
do_new_mount+0x325/0xb00 fs/namespace.c:3961
do_mount fs/namespace.c:4325 [inline]
__do_sys_mount fs/namespace.c:4543 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4520
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f270359f7ca
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:00007f2704387e18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f2704387ea0 RCX: 00007f270359f7ca
RDX: 000020000003e000 RSI: 000020000003e040 RDI: 00007f2704387e60
RBP: 000020000003e000 R08: 00007f2704387ea0 R09: 00000000000008c0
R10: 00000000000008c0 R11: 0000000000000246 R12: 000020000003e040
R13: 00007f2704387e60 R14: 0000000000004434 R15: 000020000003e080
</TASK>
----------------
Code disassembly (best guess):
0: ff ljmp (bad)
1: e9 14 ff ff ff jmp 0xffffff1a
6: e8 f0 55 4e ff call 0xff4e55fb
b: eb 05 jmp 0x12
d: e8 e9 55 4e ff call 0xff4e55fb
12: 48 c7 c7 80 0e f3 8f mov $0xffffffff8ff30e80,%rdi
19: e8 7d bc 73 09 call 0x973bc9b
1e: 48 8d 3d 86 17 07 0f lea 0xf071786(%rip),%rdi # 0xf0717ab
25: 48 8b 74 24 08 mov 0x8(%rsp),%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 48 83 c4 20 add $0x20,%rsp
33: 5b pop %rbx
34: 41 5c pop %r12
36: 41 5d pop %r13
38: 41 5e pop %r14
3a: 41 5f pop %r15
3c: 5d pop %rbp
3d: e9 .byte 0xe9
3e: c9 leave
3f: fe .byte 0xfe
Struck through repros no longer work on HEAD.