syzbot


BUG: corrupted list in __dentry_kill (3)

Status: upstream: reported C repro on 2026/02/01 13:41
Bug presence: origin:downstream
[Documentation on labels]
Reported-by: syzbot+b303d032edd8f655572c@syzkaller.appspotmail.com
First crash: 109d, last: 2d06h
Bug presence (3)
Date Name Commit Repro Result
2026/02/01 android14-6.1 (ToT) 478ca7133d0e C [report] BUG: corrupted list in __dentry_kill
2026/02/01 lts (merge base) e50b81c50fcb C Didn't crash
2026/02/01 upstream (ToT) 162b42445b58 C Didn't crash
Similar bugs (10)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-15 BUG: corrupted list in __dentry_kill (2) origin:downstream 8 C 21 7d18h 10d 0/2 upstream: reported C repro on 2026/01/26 16:31
upstream BUG: corrupted list in __dentry_kill fs 8 C 35 2848d 2868d 5/29 fixed on 2018/05/08 18:30
android-54 BUG: corrupted list in __dentry_kill (2) 8 C 11 272d 681d 0/2 upstream: reported C repro on 2024/03/27 11:32
linux-4.19 BUG: corrupted list in __dentry_kill 8 1 2121d 2121d 0/1 auto-closed as invalid on 2020/08/15 07:34
android-5-15 BUG: corrupted list in __dentry_kill 8 1 403d 403d 0/2 auto-obsoleted due to no activity on 2025/03/30 08:49
android-5-10 BUG: corrupted list in __dentry_kill 8 C inconclusive 171 7h52m 681d 0/2 upstream: reported C repro on 2024/03/27 10:55
upstream BUG: corrupted list in __dentry_kill (2) fs 8 C done 4945 2248d 2248d 15/29 fixed on 2020/02/18 14:31
android-6-1 BUG: corrupted list in __dentry_kill (2) 8 2 291d 361d 0/2 auto-obsoleted due to no activity on 2025/07/20 02:58
android-54 BUG: corrupted list in __dentry_kill 8 1 1039d 1039d 0/2 auto-obsoleted due to no activity on 2023/08/01 17:00
android-6-1 BUG: corrupted list in __dentry_kill 8 2 546d 573d 0/2 auto-obsoleted due to no activity on 2024/11/07 13:03

Sample crash report:
list_del corruption. prev->next should be ffff8881117c24d0, but was ffff8881236d0d60. (prev=ffff8881117be6f0)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:61!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 443 Comm: syz.2.39 Tainted: G        W          syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__list_del_entry_valid+0x10f/0x130 lib/list_debug.c:59
Code: e8 2e 4a 88 02 0f 0b 48 c7 c7 00 76 ca 85 48 89 de e8 1d 4a 88 02 0f 0b 48 c7 c7 60 76 ca 85 48 89 de 4c 89 f9 e8 09 4a 88 02 <0f> 0b 48 c7 c7 e0 76 ca 85 48 89 de 4c 89 f1 e8 f5 49 88 02 0f 0b
RSP: 0018:ffffc90000c17c60 EFLAGS: 00010246
RAX: 000000000000006d RBX: ffff8881117c24d0 RCX: 828356e615aa7600
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffffc90000c17c80 R08: ffffc90000c17847 R09: 1ffff92000182f08
R10: dffffc0000000000 R11: fffff52000182f09 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff8881236d0d60 R15: ffff8881117be6f0
FS:  00007fddb91de6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 0000000114d74000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __list_del_entry include/linux/list.h:134 [inline]
 dentry_unlist fs/dcache.c:554 [inline]
 __dentry_kill+0x25d/0x670 fs/dcache.c:607
 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1
 dput+0x42/0x80 fs/dcache.c:918
 __fput+0x5be/0x8f0 fs/file_table.c:328
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x1e1/0x250 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fddb939aeb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fddb91de028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: 0000000000000000 RBX: 00007fddb9616090 RCX: 00007fddb939aeb9
RDX: 0000200000000440 RSI: 0000200000000100 RDI: 0000000000000000
RBP: 00007fddb9408c1f R08: 0000200000000200 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fddb9616128 R14: 00007fddb9616090 R15: 00007ffed824d1d8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid+0x10f/0x130 lib/list_debug.c:59
Code: e8 2e 4a 88 02 0f 0b 48 c7 c7 00 76 ca 85 48 89 de e8 1d 4a 88 02 0f 0b 48 c7 c7 60 76 ca 85 48 89 de 4c 89 f9 e8 09 4a 88 02 <0f> 0b 48 c7 c7 e0 76 ca 85 48 89 de 4c 89 f1 e8 f5 49 88 02 0f 0b
RSP: 0018:ffffc90000c17c60 EFLAGS: 00010246
RAX: 000000000000006d RBX: ffff8881117c24d0 RCX: 828356e615aa7600
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffffc90000c17c80 R08: ffffc90000c17847 R09: 1ffff92000182f08
R10: dffffc0000000000 R11: fffff52000182f09 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff8881236d0d60 R15: ffff8881117be6f0
FS:  00007fddb91de6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 0000000114d74000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (9):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/04 09:40 android14-6.1 775f23d50ca8 42b01fab .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: corrupted list in __dentry_kill
2026/02/01 13:38 android14-6.1 478ca7133d0e 6b8752f2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: corrupted list in __dentry_kill
2026/01/31 22:03 android14-6.1 defbecba6f63 afc0c4d4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: corrupted list in __dentry_kill
2026/01/28 10:16 android14-6.1 28238b5ea70e 3029c699 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: corrupted list in __dentry_kill
2026/01/22 04:03 android14-6.1 c298d33764cb 8fc37797 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: corrupted list in __dentry_kill
2026/01/20 19:36 android14-6.1 1c6403722ffe 06648d9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: corrupted list in __dentry_kill
2025/12/29 14:16 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: corrupted list in __dentry_kill
2025/11/24 11:05 android14-6.1 eba111621724 4fb8ef37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: corrupted list in __dentry_kill
2025/10/19 21:37 android14-6.1 22c0b7236c43 1c8c8cd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: corrupted list in __dentry_kill
* Struck through repros no longer work on HEAD.