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kernel BUG in bch2_journal_noflush_seq

Status: upstream: reported C repro on 2024/07/10 20:55
Subsystems: bcachefs
[Documentation on labels]
Reported-by: syzbot+85700120f75fc10d4e18@syzkaller.appspotmail.com
First crash: 63d, last: 41d
Cause bisection: introduced by (bisect log) :
commit f7643bc9749f270d487c32dc35b578575bf1adb0
Author: Kent Overstreet <kent.overstreet@linux.dev>
Date: Wed Apr 17 05:26:02 2024 +0000

  bcachefs: make btree read errors silent during scan

Crash: kernel BUG in bch2_journal_noflush_seq (log)
Repro: C syz .config
  
Fix bisection: fixed by (bisect log) :
commit 2744e5c9eb1a1090b5f61c955e934c70bfe6b04c
Author: Kent Overstreet <kent.overstreet@linux.dev>
Date: Wed Dec 27 23:31:46 2023 +0000

  bcachefs: KEY_TYPE_accounting

  
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [bcachefs?] kernel BUG in bch2_journal_noflush_seq 0 (2) 2024/09/02 10:53
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/07/20 21:00 47m retest repro upstream OK log

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/bcachefs/journal.c:105!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 PID: 5083 Comm: syz-executor282 Not tainted 6.10.0-rc6-syzkaller-00212-g1dd28064d416 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:journal_seq_to_buf fs/bcachefs/journal.c:105 [inline]
RIP: 0010:bch2_journal_noflush_seq+0x320/0x330 fs/bcachefs/journal.c:805
Code: e8 f5 ba 65 fd 48 8b 3c 24 e8 6c a3 57 07 44 89 f0 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 d1 ba 65 fd 90 <0f> 0b e8 c9 ba 65 fd 90 0f 0b 66 0f 1f 44 00 00 90 90 90 90 90 90
RSP: 0018:ffffc90002eeed78 EFLAGS: 00010293
RAX: ffffffff84306bef RBX: 000000000000000e RCX: ffff8880264f0000
RDX: 0000000000000000 RSI: 000000000000000f RDI: 000000000000000e
RBP: ffff888076a4aa80 R08: ffffffff84306a49 R09: 1ffff1100ed4954f
R10: dffffc0000000000 R11: ffffed100ed49550 R12: ffff888076a4a548
R13: dffffc0000000000 R14: 008bf40000000001 R15: 000000000000000f
FS:  0000555572c0e380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555572c1f738 CR3: 000000007ab70000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_trigger_alloc+0xa4a/0x3e10 fs/bcachefs/alloc_background.c:854
 run_one_mem_trigger+0x7e9/0xb90
 bch2_trans_commit_write_locked fs/bcachefs/btree_trans_commit.c:713 [inline]
 do_bch2_trans_commit fs/bcachefs/btree_trans_commit.c:876 [inline]
 __bch2_trans_commit+0x5083/0x88e0 fs/bcachefs/btree_trans_commit.c:1119
 bch2_trans_commit fs/bcachefs/btree_update.h:170 [inline]
 bch2_inode_delete_keys+0xae8/0x1440 fs/bcachefs/inode.c:845
 bch2_inode_rm+0x165/0xd40 fs/bcachefs/inode.c:874
 bch2_evict_inode+0x21c/0x3c0 fs/bcachefs/fs.c:1588
 evict+0x2a8/0x630 fs/inode.c:667
 do_unlinkat+0x512/0x830 fs/namei.c:4420
 __do_sys_unlink fs/namei.c:4461 [inline]
 __se_sys_unlink fs/namei.c:4459 [inline]
 __x64_sys_unlink+0x49/0x60 fs/namei.c:4459
 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: 0033:0x7f8443dc9b17
Code: 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc4d875828 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8443dc9b17
RDX: 00007ffc4d875850 RSI: 00007ffc4d8758e0 RDI: 00007ffc4d8758e0
RBP: 00007ffc4d8758e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffc4d8769d0
R13: 0000555572c17700 R14: 0000000000000001 R15: 431bde82d7b634db
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:journal_seq_to_buf fs/bcachefs/journal.c:105 [inline]
RIP: 0010:bch2_journal_noflush_seq+0x320/0x330 fs/bcachefs/journal.c:805
Code: e8 f5 ba 65 fd 48 8b 3c 24 e8 6c a3 57 07 44 89 f0 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 d1 ba 65 fd 90 <0f> 0b e8 c9 ba 65 fd 90 0f 0b 66 0f 1f 44 00 00 90 90 90 90 90 90
RSP: 0018:ffffc90002eeed78 EFLAGS: 00010293
RAX: ffffffff84306bef RBX: 000000000000000e RCX: ffff8880264f0000
RDX: 0000000000000000 RSI: 000000000000000f RDI: 000000000000000e
RBP: ffff888076a4aa80 R08: ffffffff84306a49 R09: 1ffff1100ed4954f
R10: dffffc0000000000 R11: ffffed100ed49550 R12: ffff888076a4a548
R13: dffffc0000000000 R14: 008bf40000000001 R15: 000000000000000f
FS:  0000555572c0e380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555572c1f738 CR3: 000000007ab70000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/07/06 20:46 upstream 1dd28064d416 2a40360c .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs kernel BUG in bch2_journal_noflush_seq
2024/07/28 12:09 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c912bf709078 46eb10b7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_journal_noflush_seq
* Struck through repros no longer work on HEAD.