linux-kernel - Re: [syzbot] [bcachefs?] kernel BUG in __bch2_journal_pin

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Message-ID: <674470ab.050a0220.1cc393.007c.GAE@google.com>
Date: Mon, 25 Nov 2024 04:42:19 -0800
From: syzbot <syzbot+73ed43fbe826227bd4e0@...kaller.appspotmail.com>
To: kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bcachefs?] kernel BUG in __bch2_journal_pin_put

syzbot has found a reproducer for the following issue on:

HEAD commit:    9f16d5e6f220 Merge tag 'for-linus' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10972778580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fb680913ee293bcc
dashboard link: https://syzkaller.appspot.com/bug?extid=73ed43fbe826227bd4e0
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=111e775f980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14972778580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-9f16d5e6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/15be8a79f63a/vmlinux-9f16d5e6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/82d8dde32162/bzImage-9f16d5e6.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/f0224b26c115/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+73ed43fbe826227bd4e0@...kaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at fs/bcachefs/journal_reclaim.h:30!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 4682 Comm: kworker/u5:1 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: bcachefs_journal journal_write_work
RIP: 0010:journal_seq_pin fs/bcachefs/journal_reclaim.h:30 [inline]
RIP: 0010:__bch2_journal_pin_put+0x121/0x130 fs/bcachefs/journal_reclaim.c:327
Code: 9a 52 fd 31 ff 89 de e8 0d 9a 52 fd 89 d8 5b 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc e8 f8 96 52 fd 90 0f 0b e8 f0 96 52 fd 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 90 90 90 90 90 90 90
RSP: 0018:ffffc9000dcf7a10 EFLAGS: 00010293
RAX: ffffffff84434920 RBX: 0000000000000000 RCX: ffff888000582440
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000000
RBP: ffffc9000dcf7b78 R08: ffffffff84434881 R09: ffffffff8440bb88
R10: 0000000000000004 R11: ffff888000582440 R12: dffffc0000000000
R13: ffff88804474a500 R14: ffffffffffffffff R15: ffff88804474a500
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056474e330408 CR3: 000000000e738000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_journal_buf_put_final fs/bcachefs/journal.c:217 [inline]
 __bch2_journal_buf_put fs/bcachefs/journal.h:276 [inline]
 __journal_entry_close+0x80a/0xe30 fs/bcachefs/journal.c:301
 journal_write_work+0x129/0x140 fs/bcachefs/journal.c:487
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:journal_seq_pin fs/bcachefs/journal_reclaim.h:30 [inline]
RIP: 0010:__bch2_journal_pin_put+0x121/0x130 fs/bcachefs/journal_reclaim.c:327
Code: 9a 52 fd 31 ff 89 de e8 0d 9a 52 fd 89 d8 5b 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc e8 f8 96 52 fd 90 0f 0b e8 f0 96 52 fd 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 90 90 90 90 90 90 90
RSP: 0018:ffffc9000dcf7a10 EFLAGS: 00010293
RAX: ffffffff84434920 RBX: 0000000000000000 RCX: ffff888000582440
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000000
RBP: ffffc9000dcf7b78 R08: ffffffff84434881 R09: ffffffff8440bb88
R10: 0000000000000004 R11: ffff888000582440 R12: dffffc0000000000
R13: ffff88804474a500 R14: ffffffffffffffff R15: ffff88804474a500
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056474e330408 CR3: 000000000e738000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.