syzbot


WARNING in reiserfs_mkdir

Status: upstream: reported C repro on 2025/02/12 06:02
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+ba2d09277704171df177@syzkaller.appspotmail.com
First crash: 293d, last: 10d
Fix bisection: failed (error log, bisect log)
  
Bug presence (2)
Date Name Commit Repro Result
2025/11/03 linux-5.15.y (ToT) cc5ec8769306 C [report] WARNING in reiserfs_mkdir
2025/11/03 upstream (ToT) 6146a0f1dfae C Didn't crash
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in reiserfs_mkdir origin:lts-only -1 C inconclusive 4 327d 358d 0/3 upstream: reported C repro on 2024/12/09 11:21
Last patch testing requests (4)
Created Duration User Patch Repo Result
2025/11/22 07:59 14m retest repro linux-5.15.y report log
2025/09/12 13:36 13m retest repro linux-5.15.y report log
2025/06/26 19:20 12m retest repro linux-5.15.y report log
2025/02/26 10:15 13m retest repro linux-5.15.y report log
Fix bisection attempts (2)
Created Duration User Patch Repo Result
2025/07/27 23:32 1m fix candidate upstream error job log
2025/04/17 12:31 1m bisect fix linux-5.15.y error job log

Sample crash report:
REISERFS (device loop0): journal params: device loop0, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop0): checking transaction log (loop0)
REISERFS (device loop0): Using tea hash to sort names
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4397 at fs/inode.c:332 drop_nlink+0xbb/0x100 fs/inode.c:332
Modules linked in:
CPU: 0 PID: 4397 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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 2b 10 ef ff f0 48 ff 83 c8 07 00 00 5b 41 5c 41 5e 41 5f 5d c3 e8 55 a6 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:ffffc90002e6f910 EFLAGS: 00010293
RAX: ffffffff81cd25bb RBX: ffff888060380190 RCX: ffff88807aac9dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff1ff7c39
R10: fffffbfff1ff7c39 R11: 1ffffffff1ff7c38 R12: 1ffff1100c07003b
R13: ffff8880603801b8 R14: ffff8880603801d8 R15: dffffc0000000000
FS:  000055558fa95500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fab027bb9c0 CR3: 0000000079a7a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 reiserfs_mkdir+0x6f4/0x970 fs/reiserfs/namei.c:850
 xattr_mkdir fs/reiserfs/xattr.c:76 [inline]
 create_privroot fs/reiserfs/xattr.c:889 [inline]
 reiserfs_xattr_init+0x331/0x720 fs/reiserfs/xattr.c:1012
 reiserfs_fill_super+0x1fa6/0x23e0 fs/reiserfs/super.c:2179
 mount_bdev+0x287/0x3c0 fs/super.c:1400
 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x24a/0xa40 fs/namespace.c:3034
 do_mount fs/namespace.c:3377 [inline]
 __do_sys_mount fs/namespace.c:3585 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3562
 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: 0033:0x7fbd6b0bd76a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 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:00007ffe11051008 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffe11051090 RCX: 00007fbd6b0bd76a
RDX: 00002000000001c0 RSI: 0000200000001140 RDI: 00007ffe11051050
RBP: 00002000000001c0 R08: 00007ffe11051090 R09: 0000000000000098
R10: 0000000000000098 R11: 0000000000000246 R12: 0000200000001140
R13: 00007ffe11051050 R14: 00000000000010f6 R15: 00002000000003c0
 </TASK>

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/11/01 16:20 linux-5.15.y cc5ec8769306 2c50b6a9 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-5-15-kasan WARNING in reiserfs_mkdir
2025/02/12 06:02 linux-5.15.y c16c81c81336 f2baddf5 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-5-15-kasan-arm64 WARNING in reiserfs_mkdir
2025/11/01 15:13 linux-5.15.y cc5ec8769306 2c50b6a9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in reiserfs_mkdir
2025/05/08 07:17 linux-5.15.y 16fdf2c7111b dbf35fa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in reiserfs_mkdir
* Struck through repros no longer work on HEAD.