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kernel BUG in bch2_bucket_alloc_trans (2)

Status: upstream: reported C repro on 2024/10/17 05:03
Subsystems: bcachefs
[Documentation on labels]
Reported-by: syzbot+2b6a17991a6af64f9489@syzkaller.appspotmail.com
First crash: 4d22h, last: 4d22h
Cause bisection: introduced by (bisect log) :
commit f5095b9f85a1674a92d00e7ab466499a8ba49ce1
Author: Kent Overstreet <kent.overstreet@linux.dev>
Date: Tue Jan 2 00:42:37 2024 +0000

  bcachefs: dev_usage updated by new accounting

Crash: kernel BUG in bch2_bucket_alloc_trans (log)
Repro: C syz .config
  
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [bcachefs?] kernel BUG in bch2_bucket_alloc_trans (2) 0 (1) 2024/10/17 05:03
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in bch2_bucket_alloc_trans bcachefs 18 90d 120d 27/28 fixed on 2024/08/14 03:44

Sample crash report:
bcachefs (loop0): going read-only
bcachefs (loop0): finished waiting for writes to stop
bcachefs (loop0): flushing journal and stopping allocators, journal seq 1
------------[ cut here ]------------
kernel BUG at fs/bcachefs/alloc_foreground.c:489!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 0 UID: 0 PID: 5220 Comm: syz-executor172 Not tainted 6.12.0-rc2-syzkaller-00305-g7234e2ea0edd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:bch2_bucket_alloc_freelist fs/bcachefs/alloc_foreground.c:489 [inline]
RIP: 0010:bch2_bucket_alloc_trans+0x39ec/0x3a50 fs/bcachefs/alloc_foreground.c:644
Code: e8 29 8a f0 fd e9 f0 c7 ff ff 89 d9 80 e1 07 38 c1 0f 8c f3 fd ff ff 48 89 df e8 bf 88 f0 fd e9 e6 fd ff ff e8 35 fc 89 fd 90 <0f> 0b e8 2d fc 89 fd 90 0f 0b e8 95 2b b2 07 f3 0f 1e fa e8 1c fc
RSP: 0018:ffffc90003e851c0 EFLAGS: 00010293
RAX: ffffffff840aeacb RBX: 0000000000000019 RCX: ffff88802d549e00
RDX: 0000000000000000 RSI: 0000000000000019 RDI: 0000000000000000
RBP: ffffc90003e858e8 R08: ffffffff840abd99 R09: 0000000000000000
R10: ffffc90003e857a8 R11: fffff520007d0afa R12: dffffc0000000000
R13: ffff88807a51c000 R14: 0000000000000000 R15: 0000000000000000
FS:  000055555a922380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564dd46df160 CR3: 00000000766a2000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_bucket_alloc_set_trans+0x517/0xd30 fs/bcachefs/alloc_foreground.c:804
 __open_bucket_add_buckets+0x10dc/0x1b60 fs/bcachefs/alloc_foreground.c:1049
 open_bucket_add_buckets+0x33a/0x410 fs/bcachefs/alloc_foreground.c:1093
 bch2_alloc_sectors_start_trans+0xce9/0x2030
 __bch2_btree_node_alloc fs/bcachefs/btree_update_interior.c:343 [inline]
 bch2_btree_reserve_get+0x612/0x1890 fs/bcachefs/btree_update_interior.c:554
 bch2_btree_update_start+0xe56/0x14e0 fs/bcachefs/btree_update_interior.c:1252
 bch2_btree_split_leaf+0x123/0x840 fs/bcachefs/btree_update_interior.c:1850
 bch2_trans_commit_error+0x212/0x1390 fs/bcachefs/btree_trans_commit.c:942
 __bch2_trans_commit+0x7ead/0x93c0 fs/bcachefs/btree_trans_commit.c:1140
 wb_flush_one fs/bcachefs/btree_write_buffer.c:183 [inline]
 bch2_btree_write_buffer_flush_locked+0x2aa8/0x59f0 fs/bcachefs/btree_write_buffer.c:375
 btree_write_buffer_flush_seq+0x1a43/0x1bc0 fs/bcachefs/btree_write_buffer.c:510
 bch2_btree_write_buffer_journal_flush+0x4e/0x80 fs/bcachefs/btree_write_buffer.c:525
 journal_flush_pins+0x5f7/0xb20 fs/bcachefs/journal_reclaim.c:565
 journal_flush_done+0x8e/0x260 fs/bcachefs/journal_reclaim.c:819
 bch2_journal_flush_pins+0x225/0x3a0 fs/bcachefs/journal_reclaim.c:852
 bch2_journal_flush_all_pins fs/bcachefs/journal_reclaim.h:76 [inline]
 __bch2_fs_read_only+0x124/0x430 fs/bcachefs/super.c:274
 bch2_fs_read_only+0xb57/0x1200 fs/bcachefs/super.c:354
 __bch2_fs_stop+0x105/0x540 fs/bcachefs/super.c:619
 bch2_fs_stop+0x15/0x20 fs/bcachefs/super.c:678
 bch2_fs_get_tree+0xd9f/0x1710 fs/bcachefs/fs.c:2173
 vfs_get_tree+0x90/0x2b0 fs/super.c:1800
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4055 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032
 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: 0033:0x7f61de613dea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdb66b7d48 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffdb66b7d60 RCX: 00007f61de613dea
RDX: 0000000020005b00 RSI: 0000000020005b40 RDI: 00007ffdb66b7d60
RBP: 0000000000000004 R08: 00007ffdb66b7da0 R09: 0000000000005b42
R10: 0000000000000002 R11: 0000000000000282 R12: 0000000000000002
R13: 00007ffdb66b7da0 R14: 0000000000000003 R15: 0000000001000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bch2_bucket_alloc_freelist fs/bcachefs/alloc_foreground.c:489 [inline]
RIP: 0010:bch2_bucket_alloc_trans+0x39ec/0x3a50 fs/bcachefs/alloc_foreground.c:644
Code: e8 29 8a f0 fd e9 f0 c7 ff ff 89 d9 80 e1 07 38 c1 0f 8c f3 fd ff ff 48 89 df e8 bf 88 f0 fd e9 e6 fd ff ff e8 35 fc 89 fd 90 <0f> 0b e8 2d fc 89 fd 90 0f 0b e8 95 2b b2 07 f3 0f 1e fa e8 1c fc
RSP: 0018:ffffc90003e851c0 EFLAGS: 00010293
RAX: ffffffff840aeacb RBX: 0000000000000019 RCX: ffff88802d549e00
RDX: 0000000000000000 RSI: 0000000000000019 RDI: 0000000000000000
RBP: ffffc90003e858e8 R08: ffffffff840abd99 R09: 0000000000000000
R10: ffffc90003e857a8 R11: fffff520007d0afa R12: dffffc0000000000
R13: ffff88807a51c000 R14: 0000000000000000 R15: 0000000000000000
FS:  000055555a922380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564dd46df160 CR3: 00000000766a2000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/10/13 04:59 upstream 7234e2ea0edd 084d8178 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs kernel BUG in bch2_bucket_alloc_trans
* Struck through repros no longer work on HEAD.