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kernel BUG in bch2_btree_path_peek_slot

Status: upstream: reported C repro on 2024/11/29 12:12
Subsystems: bcachefs
[Documentation on labels]
Reported-by: syzbot+3ebaf90b49bd97e920ee@syzkaller.appspotmail.com
First crash: 122d, last: 37d
Cause bisection: failed (error log, bisect log)
  
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[syzbot] Monthly bcachefs report (Feb 2025) 0 (1) 2025/02/16 21:54
[syzbot] [bcachefs?] kernel BUG in bch2_btree_path_peek_slot 0 (3) 2025/02/08 23:23
▶ ▼ Last patch testing requests (7)
Created Duration User Patch Repo Result
2025/03/04 14:12 17m retest repro linux-next error
2025/03/04 14:12 17m retest repro linux-next error
2025/03/04 13:57 19m retest repro upstream OK log
2025/03/04 14:12 17m retest repro linux-next error
2025/03/04 14:12 9m retest repro linux-next error
2025/03/04 13:57 21m retest repro upstream OK log
2025/03/04 10:38 24m retest repro upstream OK log

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/bcachefs/btree_iter.c:1850!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 2964 Comm: kworker/u8:8 Not tainted 6.14.0-rc1-next-20250207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: btree_update btree_interior_update_work
RIP: 0010:bch2_btree_path_peek_slot+0xfa2/0xfe0 fs/bcachefs/btree_iter.c:1850
Code: f7 ff ff 48 89 34 24 be 08 00 00 00 44 89 44 24 08 e8 f2 e5 e3 fd 48 8b 34 24 44 8b 44 24 08 e9 25 f7 ff ff e8 9f 08 7d fd 90 <0f> 0b e8 97 08 7d fd 90 0f 0b e8 bf 88 b7 07 e8 8a 08 7d fd 90 0f
RSP: 0018:ffffc9000bda5800 EFLAGS: 00010293
RAX: ffffffff84428051 RBX: 0000000000002164 RCX: ffff888030423c00
RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000
RBP: ffffc9000bda5910 R08: ffffffff844271e0 R09: 0000000000000000
R10: ffffc9000bda5a80 R11: fffff520017b4b52 R12: dffffc0000000000
R13: 1ffff1100484f0c2 R14: ffff8880242785f0 R15: 1ffff1100484f0c1
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f110aa60000 CR3: 0000000077baa000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_btree_iter_peek_slot+0xb67/0x27c0 fs/bcachefs/btree_iter.c:2799
 __bch2_bkey_get_iter fs/bcachefs/btree_iter.h:573 [inline]
 bch2_bkey_get_iter fs/bcachefs/btree_iter.h:587 [inline]
 bch2_check_discard_freespace_key+0x292/0xeb0 fs/bcachefs/alloc_background.c:1404
 try_alloc_bucket fs/bcachefs/alloc_foreground.c:274 [inline]
 bch2_bucket_alloc_freelist fs/bcachefs/alloc_foreground.c:425 [inline]
 bch2_bucket_alloc_trans+0x1583/0x2ea0 fs/bcachefs/alloc_foreground.c:557
 bch2_bucket_alloc_set_trans+0x57c/0xd60 fs/bcachefs/alloc_foreground.c:713
 __open_bucket_add_buckets+0x13a2/0x1e10 fs/bcachefs/alloc_foreground.c:956
 open_bucket_add_buckets+0x33a/0x410 fs/bcachefs/alloc_foreground.c:1000
 bch2_alloc_sectors_start_trans+0xce9/0x2030
 __bch2_btree_node_alloc fs/bcachefs/btree_update_interior.c:322 [inline]
 bch2_btree_reserve_get+0x612/0x1890 fs/bcachefs/btree_update_interior.c:532
 bch2_btree_update_start+0xe56/0x14e0 fs/bcachefs/btree_update_interior.c:1230
 bch2_btree_split_leaf+0x121/0x880 fs/bcachefs/btree_update_interior.c:1851
 bch2_trans_commit_error+0x212/0x1380 fs/bcachefs/btree_trans_commit.c:908
 __bch2_trans_commit+0x804d/0x9680 fs/bcachefs/btree_trans_commit.c:1085
 bch2_trans_commit fs/bcachefs/btree_update.h:183 [inline]
 btree_update_nodes_written fs/bcachefs/btree_update_interior.c:706 [inline]
 btree_interior_update_work+0x1449/0x2a70 fs/bcachefs/btree_update_interior.c:844
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317
 worker_thread+0x870/0xd30 kernel/workqueue.c:3398
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bch2_btree_path_peek_slot+0xfa2/0xfe0 fs/bcachefs/btree_iter.c:1850
Code: f7 ff ff 48 89 34 24 be 08 00 00 00 44 89 44 24 08 e8 f2 e5 e3 fd 48 8b 34 24 44 8b 44 24 08 e9 25 f7 ff ff e8 9f 08 7d fd 90 <0f> 0b e8 97 08 7d fd 90 0f 0b e8 bf 88 b7 07 e8 8a 08 7d fd 90 0f
RSP: 0018:ffffc9000bda5800 EFLAGS: 00010293
RAX: ffffffff84428051 RBX: 0000000000002164 RCX: ffff888030423c00
RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000
RBP: ffffc9000bda5910 R08: ffffffff844271e0 R09: 0000000000000000
R10: ffffc9000bda5a80 R11: fffff520017b4b52 R12: dffffc0000000000
R13: 1ffff1100484f0c2 R14: ffff8880242785f0 R15: 1ffff1100484f0c1
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f110a231000 CR3: 000000002f9c4000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (1276):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/02/08 23:23 linux-next ed58d103e6da ef44b750 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root kernel BUG in bch2_btree_path_peek_slot
2025/02/09 05:00 linux-next ed58d103e6da ef44b750 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root kernel BUG in bch2_btree_path_peek_slot
2025/02/08 20:03 linux-next ed58d103e6da ef44b750 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root kernel BUG in bch2_btree_path_peek_slot
2025/02/08 17:47 linux-next ed58d103e6da ef44b750 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root kernel BUG in bch2_btree_path_peek_slot
2025/02/14 10:17 upstream ab68d7eb7b1a d9a046cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root kernel BUG in bch2_btree_path_peek_slot
2025/02/14 00:31 upstream ab68d7eb7b1a a98a8417 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in bch2_btree_path_peek_slot
2025/02/13 22:59 upstream ab68d7eb7b1a a98a8417 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in bch2_btree_path_peek_slot
2025/02/13 22:47 upstream ab68d7eb7b1a a98a8417 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in bch2_btree_path_peek_slot
2025/02/13 21:21 upstream ab68d7eb7b1a a98a8417 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in bch2_btree_path_peek_slot
2025/02/13 20:07 upstream ab68d7eb7b1a a98a8417 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in bch2_btree_path_peek_slot
2025/02/13 19:00 upstream ab68d7eb7b1a a98a8417 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in bch2_btree_path_peek_slot
2025/02/12 14:55 upstream 09fbf3d50205 b27c2402 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root kernel BUG in bch2_btree_path_peek_slot
2025/02/10 05:59 upstream a64dcfb451e2 ef44b750 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-root kernel BUG in bch2_btree_path_peek_slot
2025/02/08 15:50 upstream 8f6629c004b1 ef44b750 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs kernel BUG in bch2_btree_path_peek_slot
2025/02/08 12:01 upstream 7ee983c850b4 ef44b750 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2 (clean fs)] ci2-upstream-fs kernel BUG in bch2_btree_path_peek_slot
2025/02/11 11:42 upstream febbc555cf0f 43f51a00 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_path_peek_slot
2024/11/29 05:40 upstream 65ae975e97d5 5df23865 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_path_peek_slot
2024/11/25 12:02 upstream 9f16d5e6f220 36dfdd05 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_btree_path_peek_slot
2025/02/18 10:32 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 c37c7249 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/18 08:17 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 c37c7249 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/18 05:54 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 9be4ace3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/18 03:52 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 9be4ace3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/18 02:37 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 9be4ace3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/18 01:32 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 9be4ace3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/17 23:58 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 9be4ace3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/17 22:03 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 9be4ace3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/17 18:42 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 9be4ace3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/17 16:32 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 9be4ace3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/17 14:58 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 9be4ace3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/17 13:13 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/17 11:28 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/17 09:02 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/17 07:11 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/17 04:37 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/17 03:32 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/17 00:50 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/16 23:23 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/16 22:19 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/16 19:27 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/16 17:08 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/16 14:12 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/16 14:09 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/16 11:12 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/16 07:42 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/16 02:57 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/16 00:02 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/15 21:52 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/15 19:27 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/15 18:14 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/15 14:29 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/15 11:05 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/15 06:47 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/15 03:32 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/15 02:02 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/14 21:50 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/14 18:04 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 d9a046cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/14 12:44 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 d9a046cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/14 08:24 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 d9a046cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
2025/02/14 01:42 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a64dcfb451e2 d9a046cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_btree_path_peek_slot
* Struck through repros no longer work on HEAD.