WARNING in minix_put_super

Status: upstream: reported syz repro on 2026/10/11 20:50
Subsystems: fs
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+bffc332f376fdab5cef0@syzkaller.appspotmail.com
First crash: 131d, last: 1h25m
▶ ▼ ✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision
4be82608 repro-c Reproduced: ✅ ❓ WARNING in minix_put_super 2026/09/25 13:51 2026/09/25 13:51 2026/09/25 14:53 f281d9d2
80c59b4b assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ✅ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ WARNING in minix_put_super 2026/06/04 00:00 2026/06/04 00:00 2026/06/04 00:34 62fe1528
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [fs?] WARNING in minix_put_super 0 (1) 2026/10/11 20:50
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in minix_put_super -1 syz, C 3 14d 14d 0/3 upstream: reported C repro on 2026/09/27 13:30
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2026/09/25 14:54 15m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 165768bb70265b5c38cf0b73fafd75be235f8b14 error job log

Sample crash report:
------------[ cut here ]------------
!buffer_uptodate(bh)
WARNING: fs/buffer.c:991 at mark_buffer_dirty+0x299/0x410 fs/buffer.c:991, CPU#0: syz-executor/5457
Modules linked in:
CPU: 0 UID: 0 PID: 5457 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:mark_buffer_dirty+0x299/0x410 fs/buffer.c:991
Code: 4c 89 f7 e8 d9 d5 d7 ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 34 44 fb ff e8 8f 56 65 ff eb 8c e8 88 56 65 ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 7a 56 65 ff 90 0f 0b 90 e9 cf fd ff ff
RSP: 0018:ffffc9000e597c90 EFLAGS: 00010293
RAX: ffffffff8262ca98 RBX: ffff8880468d50e0 RCX: ffff888036f5cb00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000001 R08: ffff8880468d50e7 R09: 1ffff11008d1aa1c
R10: dffffc0000000000 R11: ffffed1008d1aa1d R12: 1ffff1100af668cf
R13: ffff888041a50580 R14: ffff888057b34678 R15: ffff888041a505c8
FS:  000055557bc8e500(0000) GS:ffff88808b0b4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f34db7ef158 CR3: 0000000014819000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 minix_put_super+0x16d/0x460 fs/minix/inode.c:70
 generic_shutdown_super+0x13d/0x2d0 fs/super.c:751
 kill_block_super+0x44/0xa0 fs/super.c:1903
 deactivate_locked_super+0xbe/0x110 fs/super.c:586
 cleanup_mnt+0x204/0x2a0 fs/namespace.c:1392
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
 exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4096b9f417
Code: a2 c7 05 dc 62 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffeab55db28 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f4096c34ccb RCX: 00007f4096b9f417
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffeab55dbe0
RBP: 00007ffeab55dbe0 R08: 00007ffeab55ebe0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffeab55ec70
R13: 00007f4096c34ccb R14: 000000000003a52d R15: 00007ffeab55ecb0
 </TASK>

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/11 20:49 upstream b88c841d1164 4f92358f .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root WARNING in minix_put_super
2026/08/28 13:12 upstream 1b78070aaef6 e2fa417d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in minix_put_super
2026/09/12 11:52 upstream 827751b699b7 70a60e12 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in minix_put_super
2026/06/02 07:42 upstream 6f3ed7fec72f 1095583b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in minix_put_super
* Struck through repros no longer work on HEAD.