syzbot


BUG: corrupted list in chown_common

Status: moderation: reported on 2025/07/22 11:26
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+ffc82fe415f92e093dfc@syzkaller.appspotmail.com
First crash: 103d, last: 30d

Sample crash report:
 slab gfs2_inode start ffff888052c8d410 pointer offset 304 size 1584
list_del corruption. prev->next should be ffffc9000d45fae0, but was ffff888052c8d540. (prev=ffff888052c8d540)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:64!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5364 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~bpo12+1 04/01/2014
RIP: 0010:__list_del_entry_valid_or_report+0x15a/0x190 lib/list_debug.c:62
Code: e8 1b 72 31 fd 43 80 3c 2c 00 74 08 4c 89 ff e8 ec 72 52 fd 49 8b 17 48 c7 c7 20 56 03 8c 48 89 de 4c 89 f9 e8 77 4c 55 fc 90 <0f> 0b 4c 89 f7 e8 ec 71 31 fd 43 80 3c 2c 00 74 08 4c 89 ff e8 bd
RSP: 0018:ffffc9000d45f970 EFLAGS: 00010046
RAX: 000000000000006d RBX: ffffc9000d45fae0 RCX: add16dd160375a00
RDX: 0000000000000000 RSI: 0000000080000002 RDI: 0000000000000000
RBP: ffffc9000d45fbb0 R08: ffff88801fc24253 R09: 1ffff11003f8484a
R10: dffffc0000000000 R11: ffffed1003f8484b R12: 1ffff1100a591aa8
R13: dffffc0000000000 R14: ffff888052c8d540 R15: ffff888052c8d540
FS:  00007f24eb80d6c0(0000) GS:ffff88808d007000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b4fd8a7660 CR3: 0000000043ef6000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __list_del_entry_valid include/linux/list.h:124 [inline]
 __list_del_entry include/linux/list.h:215 [inline]
 list_del include/linux/list.h:229 [inline]
 rwsem_try_write_lock kernel/locking/rwsem.c:662 [inline]
 rwsem_down_write_slowpath+0x91e/0xfe0 kernel/locking/rwsem.c:1159
 __down_write_common kernel/locking/rwsem.c:1317 [inline]
 __down_write_killable kernel/locking/rwsem.c:1331 [inline]
 down_write_killable+0x1de/0x230 kernel/locking/rwsem.c:1603
 inode_lock_killable include/linux/fs.h:875 [inline]
 chown_common+0x313/0x5c0 fs/open.c:779
 do_fchownat+0x161/0x270 fs/open.c:822
 __do_sys_fchownat fs/open.c:837 [inline]
 __se_sys_fchownat fs/open.c:834 [inline]
 __x64_sys_fchownat+0xb5/0xd0 fs/open.c:834
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f24ea98eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f24eb80d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000104
RAX: ffffffffffffffda RBX: 00007f24eabe6180 RCX: 00007f24ea98eec9
RDX: 00000000000043c0 RSI: 0000200000000000 RDI: ffffffffffffff9c
RBP: 00007f24eaa11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f24eabe6218 R14: 00007f24eabe6180 R15: 00007ffc3fc37248
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0x15a/0x190 lib/list_debug.c:62
Code: e8 1b 72 31 fd 43 80 3c 2c 00 74 08 4c 89 ff e8 ec 72 52 fd 49 8b 17 48 c7 c7 20 56 03 8c 48 89 de 4c 89 f9 e8 77 4c 55 fc 90 <0f> 0b 4c 89 f7 e8 ec 71 31 fd 43 80 3c 2c 00 74 08 4c 89 ff e8 bd
RSP: 0018:ffffc9000d45f970 EFLAGS: 00010046
RAX: 000000000000006d RBX: ffffc9000d45fae0 RCX: add16dd160375a00
RDX: 0000000000000000 RSI: 0000000080000002 RDI: 0000000000000000
RBP: ffffc9000d45fbb0 R08: ffff88801fc24253 R09: 1ffff11003f8484a
R10: dffffc0000000000 R11: ffffed1003f8484b R12: 1ffff1100a591aa8
R13: dffffc0000000000 R14: ffff888052c8d540 R15: ffff888052c8d540
FS:  00007f24eb80d6c0(0000) GS:ffff88808d007000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b4fd8a7660 CR3: 0000000043ef6000 CR4: 0000000000352ef0

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/09/29 01:57 upstream 8f9736633f8c 001c9061 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: corrupted list in chown_common
2025/08/30 22:10 upstream 11e7861d680c 807a3b61 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: corrupted list in chown_common
2025/08/13 09:55 upstream 8742b2d8935f 22ec1469 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: corrupted list in chown_common
2025/07/18 11:22 upstream 6832a9317eee 88248e14 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: corrupted list in chown_common
* Struck through repros no longer work on HEAD.