syzbot


WARNING in minix_rmdir (2)

Status: upstream: reported C repro on 2026/01/13 22:36
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+7f28c102d91fd1e37c83@syzkaller.appspotmail.com
First crash: 10d, last: 10d
Bug presence (2)
Date Name Commit Repro Result
2026/01/14 linux-6.1.y (ToT) bec0e10ee67e C [report] WARNING in minix_rmdir
2026/01/14 upstream (ToT) b54345928fa1 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 107d 107d 3/3 fixed on 2025/11/17 11:56
linux-6.6 WARNING in minix_rmdir origin:lts-only -1 C error 11 26d 27d 0/2 upstream: reported C repro on 2025/12/27 21:41
linux-5.15 WARNING in minix_rmdir -1 1 426d 426d 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 9 7d14h 181d 0/3 upstream: reported C repro on 2025/07/27 03:10
upstream WARNING in minix_rmdir fs -1 C inconclusive 92 67d 381d 29/29 fixed on 2026/01/07 12:29
Fix bisection attempts (1)
Created Duration User Patch Repo Result
2026/01/23 19:11 1m fix candidate upstream error job log

Sample crash report:
Trying to free block not in datazone
minix_free_inode: bit 3 already cleared
minix_free_inode: bit 4 already cleared
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4419 at fs/inode.c:332 drop_nlink+0xe4/0x138 fs/inode.c:332
Modules linked in:
CPU: 0 PID: 4419 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : drop_nlink+0xe4/0x138 fs/inode.c:332
lr : drop_nlink+0xe4/0x138 fs/inode.c:332
sp : ffff800020f57b00
x29: ffff800020f57b00 x28: ffff0000c62d5340 x27: 1fffe0001d46280d
x26: ffff800020f57b40 x25: 1ffff000041eaf68 x24: dfff800000000000
x23: 1fffe0001d44a20f x22: dfff800000000000 x21: 0000000000000000
x20: ffff0000ea251078 x19: ffff0000ea251030 x18: 0000000000000000
x17: ffff800018186000 x16: ffff8000082d4a88 x15: 0000000000000000
x14: 000000003b9aca00 x13: 0000000000000000 x12: 0000000000ff0100
x11: ff008000089ff18c x10: 0000000000000000 x9 : ffff8000089ff18c
x8 : ffff0000c62d5340 x7 : 0000000000000000 x6 : 000000000000003f
x5 : ffff0000ea2510b8 x4 : ffff0000ea2500c8 x3 : ffff8000089ff160
x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 drop_nlink+0xe4/0x138 fs/inode.c:332
 inode_dec_link_count include/linux/fs.h:2582 [inline]
 minix_rmdir+0x164/0x1c0 fs/minix/namei.c:181
 vfs_rmdir+0x304/0x438 fs/namei.c:4199
 do_rmdir+0x238/0x50c fs/namei.c:4260
 __do_sys_unlinkat fs/namei.c:4440 [inline]
 __se_sys_unlinkat fs/namei.c:4434 [inline]
 __arm64_sys_unlinkat+0xcc/0xfc fs/namei.c:4434
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 168392
hardirqs last  enabled at (168391): [<ffff8000083c1ba4>] seqcount_lockdep_reader_access include/linux/seqlock.h:104 [inline]
hardirqs last  enabled at (168391): [<ffff8000083c1ba4>] ktime_get_coarse_real_ts64+0x114/0x244 kernel/time/timekeeping.c:2261
hardirqs last disabled at (168392): [<ffff8000119080a8>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (168092): [<ffff8000081aa3e0>] softirq_handle_end kernel/softirq.c:439 [inline]
softirqs last  enabled at (168092): [<ffff8000081aa3e0>] handle_softirqs+0xaf8/0xc6c kernel/softirq.c:624
softirqs last disabled at (168051): [<ffff800008020164>] __do_softirq+0x14/0x20 kernel/softirq.c:630
---[ end trace 0000000000000000 ]---
VFS: Lookup of 'file1' in minix loop0 would have caused loop
VFS: Lookup of 'file1' in minix loop0 would have caused loop

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/14 00:32 linux-6.1.y bec0e10ee67e d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-1-kasan-arm64 WARNING in minix_rmdir
2026/01/13 23:53 linux-6.1.y bec0e10ee67e d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-1-kasan-arm64 WARNING in minix_rmdir
2026/01/13 23:15 linux-6.1.y bec0e10ee67e d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-1-kasan-arm64 WARNING in minix_rmdir
2026/01/13 22:35 linux-6.1.y bec0e10ee67e d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in minix_rmdir
* Struck through repros no longer work on HEAD.