linux-kernel - [syzbot] [bcachefs?] kernel BUG in bch2_journal

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Message-ID: <67823638.050a0220.d0267.0040.GAE@google.com>
Date: Sat, 11 Jan 2025 01:13:28 -0800
From: syzbot <syzbot+a3885f6d294f83923567@...kaller.appspotmail.com>
To: kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [bcachefs?] kernel BUG in bch2_journal_replay (2)

Hello,

syzbot found the following issue on:

HEAD commit:    fbfd64d25c7a Merge tag 'vfs-6.13-rc7.fixes' of git://git.k..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14c9a4b0580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4ef22c4fce5135b4
dashboard link: https://syzkaller.appspot.com/bug?extid=a3885f6d294f83923567
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-fbfd64d2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ae42c226ccad/vmlinux-fbfd64d2.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1fe6ec294113/bzImage-fbfd64d2.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a3885f6d294f83923567@...kaller.appspotmail.com

loop0: detected capacity change from 0 to 32768
bcachefs (/dev/loop0): error reading default superblock: Not a bcachefs superblock (got magic c68573f6-4e1a-45ca-8265-f50d00000000)
bcachefs (loop0): starting version 0.775: (unknown version) opts=metadata_checksum=none,data_checksum=none,compression=lz4,nojournal_transaction_names
bcachefs (loop0): recovering from clean shutdown, journal seq 18446744073709550602
bcachefs (loop0): accounting_read... done
bcachefs (loop0): alloc_read... done
bcachefs (loop0): stripes_read... done
bcachefs (loop0): snapshots_read... done
bcachefs (loop0): going read-write
bcachefs (loop0): journal_replay...
------------[ cut here ]------------
kernel BUG at fs/bcachefs/recovery.c:130!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5313 Comm: syz.0.0 Not tainted 6.13.0-rc6-syzkaller-00036-gfbfd64d25c7a #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:replay_now_at fs/bcachefs/recovery.c:130 [inline]
RIP: 0010:bch2_journal_replay+0x2a09/0x2a40 fs/bcachefs/recovery.c:346
Code: 9d f5 7d 07 e8 d8 9f 54 fd 90 0f 0b e8 d0 9f 54 fd 90 0f 0b e8 c8 9f 54 fd 90 0f 0b e8 c0 9f 54 fd 90 0f 0b e8 b8 9f 54 fd 90 <0f> 0b e8 b0 9f 54 fd 90 0f 0b e8 a8 9f 54 fd 90 0f 0b e8 a0 9f 54
RSP: 0018:ffffc9002301f180 EFLAGS: 00010287
RAX: ffffffff844ae468 RBX: fffffffffffffc0b RCX: 0000000000100000
RDX: ffffc9000e762000 RSI: 000000000005e908 RDI: 000000000005e909
RBP: ffffc9002301f478 R08: ffffffff844ad9d9 R09: ffffffff84beb7ff
R10: 0000000000000004 R11: ffffffff844af370 R12: ffff8880375cabb8
R13: dffffc0000000000 R14: 00000000ffffffff R15: ffff8880375cabc0
FS:  00007f599b12f6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055fa4fa70200 CR3: 0000000033f4c000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_run_recovery_pass+0xf0/0x1e0 fs/bcachefs/recovery_passes.c:191
 bch2_run_recovery_passes+0x3a7/0x880 fs/bcachefs/recovery_passes.c:244
 bch2_fs_recovery+0x25cc/0x39d0 fs/bcachefs/recovery.c:861
 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1037
 bch2_fs_get_tree+0xd68/0x1710 fs/bcachefs/fs.c:2170
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3513
 do_mount fs/namespace.c:3853 [inline]
 __do_sys_mount fs/namespace.c:4063 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4040
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f599a3874ca
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:00007f599b12ee68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f599b12eef0 RCX: 00007f599a3874ca
RDX: 00000000200000c0 RSI: 0000000020000080 RDI: 00007f599b12eeb0
RBP: 00000000200000c0 R08: 00007f599b12eef0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000080
R13: 00007f599b12eeb0 R14: 00000000000059b2 R15: 0000000020000100
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:replay_now_at fs/bcachefs/recovery.c:130 [inline]
RIP: 0010:bch2_journal_replay+0x2a09/0x2a40 fs/bcachefs/recovery.c:346
Code: 9d f5 7d 07 e8 d8 9f 54 fd 90 0f 0b e8 d0 9f 54 fd 90 0f 0b e8 c8 9f 54 fd 90 0f 0b e8 c0 9f 54 fd 90 0f 0b e8 b8 9f 54 fd 90 <0f> 0b e8 b0 9f 54 fd 90 0f 0b e8 a8 9f 54 fd 90 0f 0b e8 a0 9f 54
RSP: 0018:ffffc9002301f180 EFLAGS: 00010287
RAX: ffffffff844ae468 RBX: fffffffffffffc0b RCX: 0000000000100000
RDX: ffffc9000e762000 RSI: 000000000005e908 RDI: 000000000005e909
RBP: ffffc9002301f478 R08: ffffffff844ad9d9 R09: ffffffff84beb7ff
R10: 0000000000000004 R11: ffffffff844af370 R12: ffff8880375cabb8
R13: dffffc0000000000 R14: 00000000ffffffff R15: ffff8880375cabc0
FS:  00007f599b12f6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055fa4fa70200 CR3: 0000000033f4c000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup