syzbot


WARNING in minix_rmdir (2)

Status: upstream: reported C repro on 2025/07/27 03:10
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+0b465d51937d865b9211@syzkaller.appspotmail.com
First crash: 146d, last: 2d00h
Bug presence (1)
Date Name Commit Repro Result
2025/07/27 upstream (ToT) ec2df4364666 C [report] WARNING in minix_rmdir
Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in minix_rmdir -1 C done 1 71d 71d 3/3 fixed on 2025/11/17 11:56
linux-5.15 WARNING in minix_rmdir -1 1 391d 391d 0/3 auto-obsoleted due to no activity on 2025/03/04 02:00
upstream WARNING in minix_rmdir fs -1 C inconclusive 92 31d 345d 27/29 upstream: reported C repro on 2025/01/08 12:17
Last patch testing requests (10)
Created Duration User Patch Repo Result
2025/11/07 16:23 9m retest repro linux-5.15.y report log
2025/10/21 01:13 12m retest repro linux-5.15.y report log
2025/10/21 01:13 15m retest repro linux-5.15.y report log
2025/10/21 01:13 11m retest repro linux-5.15.y report log
2025/10/21 01:13 12m retest repro linux-5.15.y report log
2025/08/28 21:50 10m retest repro linux-5.15.y report log
2025/08/10 21:07 16m retest repro linux-5.15.y report log
2025/08/10 21:07 43m retest repro linux-5.15.y report log
2025/08/10 21:07 15m retest repro linux-5.15.y report log
2025/08/10 21:07 27m retest repro linux-5.15.y report log
Fix bisection attempts (2)
Created Duration User Patch Repo Result
2025/12/10 12:48 1h35m bisect fix linux-5.15.y OK (0) job log log
2025/10/06 16:28 2h08m bisect fix linux-5.15.y OK (0) job log log

Sample crash report:
minix_free_inode: bit 5 already cleared
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4296 at fs/inode.c:332 drop_nlink+0xbb/0x100 fs/inode.c:332
Modules linked in:
CPU: 1 PID: 4296 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+0xbb/0x100 fs/inode.c:332
Code: 48 8b 1b 48 8d bb c8 07 00 00 be 08 00 00 00 e8 0b 10 ef ff f0 48 ff 83 c8 07 00 00 5b 41 5c 41 5e 41 5f 5d c3 e8 b5 a5 aa 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:ffffc900011efcd0 EFLAGS: 00010293
RAX: ffffffff81cd265b RBX: ffff888069bfc590 RCX: ffff88802ba93b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff1ad26b6
R10: fffffbfff1ad26b6 R11: 1ffffffff1ad26b5 R12: 1ffff1100d37f8bb
R13: ffffc900011efd40 R14: ffff888069bfc5d8 R15: dffffc0000000000
FS:  000055558896c500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558899f688 CR3: 000000007abbe000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_dec_link_count include/linux/fs.h:2504 [inline]
 minix_rmdir+0x176/0x1d0 fs/minix/namei.c:181
 vfs_rmdir+0x1b2/0x430 fs/namei.c:4157
 do_rmdir+0x295/0x710 fs/namei.c:4218
 __do_sys_unlinkat fs/namei.c:4398 [inline]
 __se_sys_unlinkat fs/namei.c:4392 [inline]
 __x64_sys_unlinkat+0xc0/0xe0 fs/namei.c:4392
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fd68d599d27
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 07 01 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:00007ffe5ca385b8 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007fd68d599d27
RDX: 0000000000000200 RSI: 00007ffe5ca39760 RDI: 00000000ffffff9c
RBP: 00007fd68d61ed7d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000207 R12: 00007ffe5ca39760
R13: 00007fd68d61ed7d R14: 0000000000014d2b R15: 00007ffe5ca3b920
 </TASK>

Crashes (9):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/18 04:46 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-5-15-kasan WARNING in minix_rmdir
2025/07/27 13:31 linux-5.15.y c79648372d02 fb8f743d .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-5-15-kasan WARNING in minix_rmdir
2025/07/27 10:35 linux-5.15.y c79648372d02 fb8f743d .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-5-15-kasan WARNING in minix_rmdir
2025/07/27 08:58 linux-5.15.y c79648372d02 fb8f743d .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-5-15-kasan WARNING in minix_rmdir
2025/07/27 07:40 linux-5.15.y c79648372d02 fb8f743d .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-5-15-kasan WARNING in minix_rmdir
2025/07/27 06:17 linux-5.15.y c79648372d02 fb8f743d .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-5-15-kasan WARNING in minix_rmdir
2025/07/27 04:59 linux-5.15.y c79648372d02 fb8f743d .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-5-15-kasan WARNING in minix_rmdir
2025/12/18 02:51 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in minix_rmdir
2025/07/27 03:09 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in minix_rmdir
* Struck through repros no longer work on HEAD.