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

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Message-ID: <67f15d1e.050a0220.0a13.0241.GAE@google.com>
Date: Sat, 05 Apr 2025 09:41:02 -0700
From: syzbot <syzbot+a3885f6d294f83923567@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, richard120310@...il.com, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bcachefs?] kernel BUG in bch2_journal_replay (2)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in bch2_journal_replay

bcachefs (loop0): bch2_btree_update_start(): error EIO
bcachefs: replay_now_at() seq = 4294967295, replay_journal_seq = 18374686479671623691
------------[ cut here ]------------
kernel BUG at fs/bcachefs/recovery.c:131!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5813 Comm: syz.0.16 Not tainted 6.13.0-rc7-syzkaller-00160-gad26fc09dabf-dirty #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:131 [inline]
RIP: 0010:bch2_journal_replay+0x2ae5/0x2b10 fs/bcachefs/recovery.c:347
Code: fd 90 0f 0b e8 8c 9d 54 fd 90 0f 0b e8 84 9d 54 fd 90 0f 0b e8 7c 9d 54 fd 90 0f 0b e8 74 9d 54 fd 90 0f 0b e8 6c 9d 54 fd 90 <0f> 0b e8 64 9d 54 fd 90 0f 0b e8 5c 9d 54 fd 90 0f 0b e8 54 9d 54
RSP: 0018:ffffc900028d7180 EFLAGS: 00010293
RAX: ffffffff844ae504 RBX: ff0000000000000b RCX: ffff888000c9a440
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ff0000000000000b
RBP: ffffc900028d7478 R08: ffffffff844adb29 R09: 1ffff9200051adcc
R10: dffffc0000000000 R11: fffff5200051adcd R12: ffff88804b4cabb8
R13: dffffc0000000000 R14: ffff88804b4cabc0 R15: 00000000ffffffff
FS:  00007ff25c6246c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055bfa0a02048 CR3: 000000003f8a4000 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:862
 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:3511
 do_mount fs/namespace.c:3851 [inline]
 __do_sys_mount fs/namespace.c:4061 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4038
 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: 0033:0x7ff25b7874ca
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:00007ff25c623e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ff25c623ef0 RCX: 00007ff25b7874ca
RDX: 00000000200058c0 RSI: 0000000020000140 RDI: 00007ff25c623eb0
RBP: 00000000200058c0 R08: 00007ff25c623ef0 R09: 0000000000004800
R10: 0000000000004800 R11: 0000000000000246 R12: 0000000020000140
R13: 00007ff25c623eb0 R14: 0000000000005a31 R15: 0000000020000180
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:replay_now_at fs/bcachefs/recovery.c:131 [inline]
RIP: 0010:bch2_journal_replay+0x2ae5/0x2b10 fs/bcachefs/recovery.c:347
Code: fd 90 0f 0b e8 8c 9d 54 fd 90 0f 0b e8 84 9d 54 fd 90 0f 0b e8 7c 9d 54 fd 90 0f 0b e8 74 9d 54 fd 90 0f 0b e8 6c 9d 54 fd 90 <0f> 0b e8 64 9d 54 fd 90 0f 0b e8 5c 9d 54 fd 90 0f 0b e8 54 9d 54
RSP: 0018:ffffc900028d7180 EFLAGS: 00010293
RAX: ffffffff844ae504 RBX: ff0000000000000b RCX: ffff888000c9a440
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ff0000000000000b
RBP: ffffc900028d7478 R08: ffffffff844adb29 R09: 1ffff9200051adcc
R10: dffffc0000000000 R11: fffff5200051adcd R12: ffff88804b4cabb8
R13: dffffc0000000000 R14: ffff88804b4cabc0 R15: 00000000ffffffff
FS:  00007ff25c6246c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055bfa0a02048 CR3: 000000003f8a4000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


Tested on:

commit:         ad26fc09 Merge tag 'mm-hotfixes-stable-2025-01-16-21-1..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=14532b4c580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=aadf89e2f6db86cc
dashboard link: https://syzkaller.appspot.com/bug?extid=a3885f6d294f83923567
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=175e423f980000