syzbot


WARNING in V2_minix_truncate

Status: moderation: reported on 2026/04/12 01:11
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+c4a3f3309f242c420850@syzkaller.appspotmail.com
First crash: 42d, last: 13d

Sample crash report:
Buffer I/O error on dev loop0, logical block 4, lost sync page write
IO error syncing minix inode [loop0:00000009]
------------[ cut here ]------------
!buffer_uptodate(bh)
WARNING: fs/buffer.c:1087 at mark_buffer_dirty+0x299/0x410 fs/buffer.c:1087, CPU#0: syz.0.0/5331
Modules linked in:
CPU: 0 UID: 0 PID: 5331 Comm: syz.0.0 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:1087
Code: 4c 89 f7 e8 89 5d da ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 b4 63 fb ff e8 ef 93 6d ff eb 8c e8 e8 93 6d ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 da 93 6d ff 90 0f 0b 90 e9 cf fd ff ff
RSP: 0018:ffffc9000465f1b0 EFLAGS: 00010283
RAX: ffffffff82583af8 RBX: ffff8880463c2828 RCX: 0000000000100000
RDX: ffffc90021003000 RSI: 0000000000002d22 RDI: 0000000000002d23
RBP: ffffc9000465f301 R08: ffff8880463c282f R09: 1ffff11008c78505
R10: dffffc0000000000 R11: ffffed1008c78506 R12: ffff88801fc8ab1c
R13: 1ffff11003f91560 R14: ffff88801fc8ab00 R15: 0000000000000017
FS:  00007f92370326c0(0000) GS:ffff88808c885000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb6b9235113 CR3: 0000000012679000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 free_data fs/minix/itree_common.c:272 [inline]
 truncate fs/minix/itree_common.c:321 [inline]
 V2_minix_truncate+0x2f4/0x1170 fs/minix/itree_v2.c:69
 minix_truncate fs/minix/inode.c:733 [inline]
 minix_evict_inode+0x1db/0x260 fs/minix/inode.c:50
 evict+0x61e/0xb10 fs/inode.c:841
 minix_mkdir+0xe2/0x120 fs/minix/namei.c:136
 vfs_mkdir+0x413/0x630 fs/namei.c:5261
 ovl_do_mkdir fs/overlayfs/overlayfs.h:257 [inline]
 ovl_workdir_create+0x4d7/0x940 fs/overlayfs/super.c:345
 ovl_make_workdir fs/overlayfs/super.c:678 [inline]
 ovl_get_workdir fs/overlayfs/super.c:836 [inline]
 ovl_fill_super_creds fs/overlayfs/super.c:1449 [inline]
 ovl_fill_super+0x1a38/0x5e20 fs/overlayfs/super.c:1560
 vfs_get_super fs/super.c:1327 [inline]
 get_tree_nodev+0xbb/0x150 fs/super.c:1346
 vfs_get_tree+0x92/0x2a0 fs/super.c:1754
 fc_mount fs/namespace.c:1193 [inline]
 do_new_mount_fc fs/namespace.c:3758 [inline]
 do_new_mount+0x341/0xd30 fs/namespace.c:3834
 do_mount fs/namespace.c:4167 [inline]
 __do_sys_mount fs/namespace.c:4383 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4360
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f923619cdd9
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:00007f9237031fe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f9236416180 RCX: 00007f923619cdd9
RDX: 0000200000000b80 RSI: 0000200000000100 RDI: 0000000000000000
RBP: 00007f9236232d69 R08: 0000200000000140 R09: 0000000000000000
R10: 0000000000004008 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9236416218 R14: 00007f9236416180 R15: 00007ffd6b07f148
 </TASK>

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/06 23:49 upstream adc1e5c6203c f250db59 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in V2_minix_truncate
2026/04/14 06:50 upstream 26ff969926a0 1a086e7c .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in V2_minix_truncate
2026/04/08 01:04 upstream 3036cd0d3328 2c961e87 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in V2_minix_truncate
* Struck through repros no longer work on HEAD.