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kernel BUG in __bch2_trans_commit (3)

Status: upstream: reported C repro on 2025/07/12 08:32
Subsystems: bcachefs
[Documentation on labels]
Reported-by: syzbot+b6ef9edaba01d5b4e43f@syzkaller.appspotmail.com
First crash: 105d, last: 6d01h
Cause bisection: introduced by (bisect log) :
commit d0855e210675b8018f4e89ca77cbfa133bce3a71
Author: Kent Overstreet <kent.overstreet@linux.dev>
Date: Thu Dec 12 09:03:32 2024 +0000

  bcachefs: Kill snapshot_t->equiv

Crash: kernel BUG in __bch2_trans_commit (log)
Repro: C syz .config
  
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
[syzbot] Monthly bcachefs report (Sep 2025) 0 (1) 2025/09/26 05:14
[syzbot] [bcachefs?] kernel BUG in __bch2_trans_commit (3) 0 (3) 2025/09/01 14:28
[syzbot] Monthly bcachefs report (Aug 2025) 0 (1) 2025/08/26 07:13
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in __bch2_trans_commit (2) bcachefs -1 105 105d 150d 29/29 fixed on 2025/07/08 00:33
upstream kernel BUG in __bch2_trans_commit bcachefs -1 C unreliable 11858 340d 365d 28/29 fixed on 2025/05/11 00:44
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2025/10/15 14:04 20m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
2025/10/15 10:14 1h25m retest repro upstream OK log
▶ ▼ Cause bisection attempts (2)
Created Duration User Patch Repo Result
2025/09/01 08:00 6h27m bisect upstream OK (1) job log log
2025/08/24 21:45 7h23m bisect upstream error job log

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/bcachefs/btree_trans_commit.c:348!
Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP
Modules linked in:
CPU: 1 UID: 0 PID: 15 Comm: kworker/u8:1 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Workqueue: writeback wb_workfn (flush-bcachefs-1)
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : btree_insert_entry_checks fs/bcachefs/btree_trans_commit.c:343 [inline]
pc : bch2_trans_commit_write_locked fs/bcachefs/btree_trans_commit.c:725 [inline]
pc : do_bch2_trans_commit fs/bcachefs/btree_trans_commit.c:854 [inline]
pc : __bch2_trans_commit+0x6054/0x625c fs/bcachefs/btree_trans_commit.c:1085
lr : btree_insert_entry_checks fs/bcachefs/btree_trans_commit.c:343 [inline]
lr : bch2_trans_commit_write_locked fs/bcachefs/btree_trans_commit.c:725 [inline]
lr : do_bch2_trans_commit fs/bcachefs/btree_trans_commit.c:854 [inline]
lr : __bch2_trans_commit+0x6054/0x625c fs/bcachefs/btree_trans_commit.c:1085
sp : ffff800097c46c40
x29: ffff800097c46f60 x28: 00000000ffffffff x27: ffff0000cbb7e4d8
x26: ffff800092df2000 x25: 0000000000000000 x24: dfff800000000000
x23: ffff800092df2000 x22: ffff0000cbb7c020 x21: ffff0000cbb7c042
x20: 0000000000000001 x19: 0000000000000001 x18: 00000000ffffffff
x17: ffff800093507000 x16: ffff80008b007340 x15: 0000000000000002
x14: 1ffff00012f88cb0 x13: 0000000000000000 x12: 0000000000000000
x11: 00000000eacee03a x10: 0000000000ff0100 x9 : 0000000000000000
x8 : ffff0000c1a03d00 x7 : ffff8000828f3158 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002
x2 : 0000000000000008 x1 : 0000000000000080 x0 : ffff0000c1a03d00
Call trace:
 btree_insert_entry_checks fs/bcachefs/btree_trans_commit.c:343 [inline] (P)
 bch2_trans_commit_write_locked fs/bcachefs/btree_trans_commit.c:725 [inline] (P)
 do_bch2_trans_commit fs/bcachefs/btree_trans_commit.c:854 [inline] (P)
 __bch2_trans_commit+0x6054/0x625c fs/bcachefs/btree_trans_commit.c:1085 (P)
 bch2_trans_commit fs/bcachefs/btree_update.h:241 [inline]
 bch2_write_inode+0x52c/0x92c fs/bcachefs/fs.c:136
 bch2_vfs_write_inode+0x84/0xcc fs/bcachefs/fs.c:2148
 write_inode fs/fs-writeback.c:1525 [inline]
 __writeback_single_inode+0x5ac/0x13e8 fs/fs-writeback.c:1745
 writeback_sb_inodes+0x55c/0xe40 fs/fs-writeback.c:1976
 wb_writeback+0x3cc/0xd70 fs/fs-writeback.c:2156
 wb_do_writeback fs/fs-writeback.c:2303 [inline]
 wb_workfn+0x338/0xdc0 fs/fs-writeback.c:2343
 process_one_work+0x7e8/0x155c kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x958/0xed8 kernel/workqueue.c:3400
 kthread+0x5fc/0x75c kernel/kthread.c:463
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
Code: f940abe0 978e09e2 17ffffe0 97790f85 (d4210000) 
---[ end trace 0000000000000000 ]---

Crashes (332):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/08/23 17:34 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f5ae30d69d7 bf27483f .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 kernel BUG in __bch2_trans_commit
2025/08/24 18:38 upstream c330cb607721 bf27483f .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs kernel BUG in __bch2_trans_commit
2025/09/30 08:58 upstream 449c2b302c8e 86341da6 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/30 06:58 upstream 449c2b302c8e 86341da6 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/30 05:04 upstream 449c2b302c8e 86341da6 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/30 02:04 upstream 449c2b302c8e 86341da6 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/29 21:13 upstream e5f0a698b34e 86341da6 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/29 19:57 upstream e5f0a698b34e 86341da6 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/29 17:37 upstream e5f0a698b34e 86341da6 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/29 16:16 upstream e5f0a698b34e 86341da6 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/29 04:47 upstream 8f9736633f8c 001c9061 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/29 00:42 upstream 8f9736633f8c 001c9061 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/28 23:44 upstream 8f9736633f8c 001c9061 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/28 22:00 upstream 8f9736633f8c 001c9061 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/28 16:56 upstream 51a24b7deaae 001c9061 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/28 15:07 upstream 51a24b7deaae 001c9061 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/28 05:22 upstream 51a24b7deaae 001c9061 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/27 22:55 upstream fec734e8d564 001c9061 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/27 21:37 upstream fec734e8d564 001c9061 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/27 15:34 upstream fec734e8d564 001c9061 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/27 13:23 upstream fec734e8d564 001c9061 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/27 09:11 upstream 083fc6d7fa0d 001c9061 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/27 08:41 upstream 083fc6d7fa0d 001c9061 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/27 07:23 upstream 083fc6d7fa0d 001c9061 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/27 05:58 upstream 083fc6d7fa0d 001c9061 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/27 03:33 upstream 083fc6d7fa0d 001c9061 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/27 01:25 upstream 083fc6d7fa0d 001c9061 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/26 14:35 upstream 4ff71af020ae 0abd0691 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/26 12:39 upstream 4ff71af020ae 0abd0691 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/26 11:12 upstream 4ff71af020ae 0abd0691 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/26 08:07 upstream 4ff71af020ae 0abd0691 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/26 04:08 upstream 4ff71af020ae 0abd0691 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/26 02:31 upstream 4ff71af020ae 0abd0691 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/25 22:39 upstream bf40f4b87761 0abd0691 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/25 20:39 upstream bf40f4b87761 0abd0691 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/25 19:32 upstream bf40f4b87761 0abd0691 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/25 18:05 upstream bf40f4b87761 0abd0691 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/25 15:59 upstream bf40f4b87761 0abd0691 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/25 12:40 upstream bf40f4b87761 0abd0691 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/25 04:07 upstream 4ea5af085908 0abd0691 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/25 00:36 upstream 4ea5af085908 0abd0691 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/24 22:45 upstream 4ea5af085908 0abd0691 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/24 15:45 upstream cec1e6e5d1ab 0abd0691 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/09/24 10:17 upstream cec1e6e5d1ab 0abd0691 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/07/12 03:38 upstream 40f92e79b0aa 3cda49cf .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/07/08 08:20 upstream d7b8f8e20813 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in __bch2_trans_commit
2025/08/26 00:09 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f5ae30d69d7 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in __bch2_trans_commit
* Struck through repros no longer work on HEAD.