syzbot


WARNING in minix_unlink (2)

Status: upstream: reported C repro on 2025/12/28 17:43
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+b5eb0242f0a3fb5bb427@syzkaller.appspotmail.com
First crash: 14d, last: 13d
Bug presence (2)
Date Name Commit Repro Result
2025/12/28 linux-6.6.y (ToT) 5fa4793a2d2d C [report] WARNING in minix_unlink
2025/12/28 upstream (ToT) c875a6c32467 C Didn't crash
Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in minix_unlink origin:upstream -1 C 105 12d 483d 0/3 upstream: reported C repro on 2024/09/15 23:46
upstream WARNING in minix_unlink fs -1 C inconclusive 458 33d 415d 0/29 upstream: reported C repro on 2024/11/22 18:44
linux-6.1 WARNING in minix_unlink origin:upstream missing-backport -1 C error 61 9d08h 401d 0/3 upstream: reported C repro on 2024/12/06 04:33
linux-6.6 WARNING in minix_unlink origin:upstream -1 C done 12 112d 113d 2/2 fixed on 2025/10/30 16:45

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5878 at fs/inode.c:332 drop_nlink+0xbf/0x100 fs/inode.c:332
Modules linked in:
CPU: 1 PID: 5878 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:drop_nlink+0xbf/0x100 fs/inode.c:332
Code: 48 8b 1b 48 8d bb 78 07 00 00 be 08 00 00 00 e8 e7 48 ea ff f0 48 ff 83 78 07 00 00 5b 41 5c 41 5e 41 5f 5d c3 e8 01 d9 92 ff <0f> 0b eb 88 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 62 ff ff ff 4c
RSP: 0018:ffffc90003277cb0 EFLAGS: 00010293
RAX: ffffffff81f2b7bf RBX: ffff88805f9b0590 RCX: ffff88802461bc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffea00017b55b7 R09: 1ffffd40002f6ab6
R10: dffffc0000000000 R11: fffff940002f6ab7 R12: 1ffff1100bf360bd
R13: 1ffff9200064ef9c R14: ffff88805f9b05e8 R15: dffffc0000000000
FS:  0000555574029500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f475dc08000 CR3: 000000006011c000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 inode_dec_link_count include/linux/fs.h:2340 [inline]
 minix_unlink+0x18b/0x1e0 fs/minix/namei.c:158
 vfs_unlink+0x389/0x600 fs/namei.c:4333
 do_unlinkat+0x328/0x570 fs/namei.c:4399
 __do_sys_unlink fs/namei.c:4447 [inline]
 __se_sys_unlink fs/namei.c:4445 [inline]
 __x64_sys_unlink+0x49/0x50 fs/namei.c:4445
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f277378ecf7
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 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:00007ffde6722f78 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f277378ecf7
RDX: 00007ffde6722fa0 RSI: 00007ffde6723030 RDI: 00007ffde6723030
RBP: 00007ffde6723030 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffde6724120
R13: 00007f2773813d7d R14: 00000000000176c8 R15: 00007ffde67251f0
 </TASK>

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/29 04:06 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-6-kasan WARNING in minix_unlink
2025/12/29 01:59 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-6-kasan WARNING in minix_unlink
2025/12/28 23:59 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-6-kasan WARNING in minix_unlink
2025/12/28 22:10 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-6-kasan WARNING in minix_unlink
2025/12/28 19:30 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-6-kasan WARNING in minix_unlink
2025/12/28 17:42 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in minix_unlink
* Struck through repros no longer work on HEAD.