WARNING in minix_rmdir

Status: upstream: reported C repro on 2025/12/27 21:41
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+ad0c1f4d763cfeb7f15c@syzkaller.appspotmail.com
First crash: 212d, last: 15d
Bug presence (2)
Date Name Commit Repro Result
2025/12/29 linux-6.6.y (ToT) 5fa4793a2d2d C [report] WARNING in minix_rmdir
2025/12/29 upstream (ToT) f8f9c1f4d0c7 C Didn't crash
Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in minix_rmdir -1 C done 1 292d 292d 3/3 fixed on 2025/11/17 11:56
linux-5.15 WARNING in minix_rmdir -1 1 611d 611d 0/3 auto-obsoleted due to no activity on 2025/03/04 02:00
linux-5.15 WARNING in minix_rmdir (2) origin:upstream -1 C error 9 42d 366d 0/3 upstream: reported C repro on 2025/07/27 03:10
linux-6.1 WARNING in minix_rmdir (2) origin:lts-only -1 C error 4 195d 195d 0/3 upstream: reported C repro on 2026/01/13 22:36
upstream WARNING in minix_rmdir fs -1 C inconclusive 92 252d 566d 29/29 fixed on 2026/01/07 12:29
Fix bisection attempts (4)
Created Duration User Patch Repo Result
2026/06/01 08:06 1h34m fix candidate upstream error job log
2026/03/24 11:35 1m fix candidate upstream error job log
2026/02/22 04:52 1m fix candidate upstream error job log
2026/01/23 00:22 1m fix candidate upstream error job log

Sample crash report:
syz.0.17[5933]: memfd_create() called without MFD_EXEC or MFD_NOEXEC_SEAL set
loop0: detected capacity change from 0 to 64
syz.0.17: attempt to access beyond end of device
loop0: rw=2049, sector=268435468, nr_sectors = 2 limit=64
Buffer I/O error on dev loop0, logical block 134217734, lost async page write
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5933 at fs/inode.c:332 drop_nlink+0xbf/0x100 fs/inode.c:332
Modules linked in:
CPU: 1 PID: 5933 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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 17 0c ea ff f0 48 ff 83 78 07 00 00 5b 41 5c 41 5e 41 5f 5d c3 e8 41 92 91 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:ffffc90003267cf0 EFLAGS: 00010293
RAX: ffffffff81f5532f RBX: ffff88805e180590 RCX: ffff88802c825a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffea0001b41977 R09: 1ffffd400036832e
R10: dffffc0000000000 R11: fffff9400036832f R12: 1ffff1100bc300bd
R13: ffff88805e180040 R14: ffff88805e1805e8 R15: dffffc0000000000
FS:  00005555885d7500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000077453000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 inode_dec_link_count include/linux/fs.h:2340 [inline]
 minix_unlink fs/minix/namei.c:158 [inline]
 minix_rmdir+0x216/0x290 fs/minix/namei.c:168
 vfs_rmdir+0x352/0x4b0 fs/namei.c:4204
 do_rmdir+0x29f/0x590 fs/namei.c:4263
 __do_sys_rmdir fs/namei.c:4282 [inline]
 __se_sys_rmdir fs/namei.c:4280 [inline]
 __x64_sys_rmdir+0x49/0x50 fs/namei.c:4280
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7feb4379de59
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:00007ffee93be6a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 00007feb43a25fa0 RCX: 00007feb4379de59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00002000000000c0
RBP: 00007feb43833e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007feb43a25fac R14: 00007feb43a25fa0 R15: 00007feb43a25fa0
 </TASK>

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/12 22:45 linux-6.6.y da47cbc25466 d78ea535 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-6-kasan WARNING in minix_rmdir
2025/12/28 08:22 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_rmdir
2025/12/28 06:51 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_rmdir
2025/12/28 05:28 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_rmdir
2025/12/28 04:14 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_rmdir
2025/12/28 02:58 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_rmdir
2025/12/28 01:43 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_rmdir
2025/12/28 00:05 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_rmdir
2026/07/12 22:18 linux-6.6.y da47cbc25466 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in minix_rmdir
2026/06/30 23:00 linux-6.6.y d1cfde2d5d15 00e8b0fd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in minix_rmdir
2026/06/30 23:00 linux-6.6.y d1cfde2d5d15 00e8b0fd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in minix_rmdir
2025/12/28 21:09 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in minix_rmdir
2025/12/27 21:43 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in minix_rmdir
2025/12/27 21:41 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in minix_rmdir
2025/12/27 21:41 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in minix_rmdir
* Struck through repros no longer work on HEAD.