syzbot


kernel BUG in bch2_alloc_v4_invalid

Status: fixed on 2024/06/05 13:52
Subsystems: bcachefs
[Documentation on labels]
Reported-by: syzbot+10827fa6b176e1acf1d0@syzkaller.appspotmail.com
Fix commit: 6b8cbfc3db75 bcachefs: Fix assert in bch2_alloc_v4_invalid()
First crash: 48d, last: 24d
Cause bisection: failed (error log, bisect log)
  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [bcachefs?] kernel BUG in bch2_alloc_v4_invalid 0 (1) 2024/05/05 16:25

Sample crash report:
loop0: detected capacity change from 0 to 32768
bcachefs (loop0): mounting version 1.7: mi_btree_bitmap opts=metadata_checksum=none,data_checksum=xxhash,str_hash=crc32c,nojournal_transaction_names
bcachefs (loop0): recovering from clean shutdown, journal seq 10
------------[ cut here ]------------
kernel BUG at fs/bcachefs/alloc_background.h:166!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 0 PID: 5088 Comm: syz-executor107 Not tainted 6.9.0-rc6-next-20240503-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:alloc_v4_u64s fs/bcachefs/alloc_background.h:166 [inline]
RIP: 0010:bch2_alloc_v4_invalid+0x9af/0x9c0 fs/bcachefs/alloc_background.c:247
Code: 47 cf f6 fd e9 d7 fb ff ff 44 89 e9 80 e1 07 38 c1 0f 8c 23 fc ff ff 4c 89 ef e8 cc ce f6 fd e9 16 fc ff ff e8 62 20 91 fd 90 <0f> 0b e8 5a 20 91 fd 90 0f 0b 0f 1f 80 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffc900035be618 EFLAGS: 00010293
RAX: ffffffff8404f57e RBX: 00000000000000fd RCX: ffff88807c78bc00
RDX: 0000000000000000 RSI: 00000000000000fd RDI: 00000000000000fa
RBP: 000000000000002d R08: ffffffff8404eca5 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8404ebd0 R12: 000000005770f4b6
R13: ffffc900035beaa0 R14: ffff8880778c06e8 R15: 1ffff920006b7d45
FS:  000055559514f380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd24b68da8 CR3: 000000002de70000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_btree_node_read_done+0x3e7d/0x5ed0 fs/bcachefs/btree_io.c:1234
 btree_node_read_work+0x665/0x1300 fs/bcachefs/btree_io.c:1345
 bch2_btree_node_read+0x2637/0x2c80 fs/bcachefs/btree_io.c:1730
 __bch2_btree_root_read fs/bcachefs/btree_io.c:1769 [inline]
 bch2_btree_root_read+0x61e/0x970 fs/bcachefs/btree_io.c:1793
 read_btree_roots+0x22d/0x7b0 fs/bcachefs/recovery.c:472
 bch2_fs_recovery+0x2334/0x36e0 fs/bcachefs/recovery.c:800
 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1030
 bch2_fs_open+0xa8d/0xdf0 fs/bcachefs/super.c:2105
 bch2_mount+0x71d/0x1320 fs/bcachefs/fs.c:1917
 legacy_get_tree+0xee/0x190 fs/fs_context.c:662
 vfs_get_tree+0x90/0x2a0 fs/super.c:1780
 do_new_mount+0x2be/0xb40 fs/namespace.c:3352
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff34d527a3a
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:00007ffd7ed56fe8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffd7ed57000 RCX: 00007ff34d527a3a
RDX: 0000000020011a00 RSI: 0000000020011a40 RDI: 00007ffd7ed57000
RBP: 0000000000000004 R08: 00007ffd7ed57040 R09: 00000000000119ee
R10: 0000000000200014 R11: 0000000000000282 R12: 0000000000200014
R13: 00007ffd7ed57040 R14: 0000000000000003 R15: 0000000001000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:alloc_v4_u64s fs/bcachefs/alloc_background.h:166 [inline]
RIP: 0010:bch2_alloc_v4_invalid+0x9af/0x9c0 fs/bcachefs/alloc_background.c:247
Code: 47 cf f6 fd e9 d7 fb ff ff 44 89 e9 80 e1 07 38 c1 0f 8c 23 fc ff ff 4c 89 ef e8 cc ce f6 fd e9 16 fc ff ff e8 62 20 91 fd 90 <0f> 0b e8 5a 20 91 fd 90 0f 0b 0f 1f 80 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffc900035be618 EFLAGS: 00010293
RAX: ffffffff8404f57e RBX: 00000000000000fd RCX: ffff88807c78bc00
RDX: 0000000000000000 RSI: 00000000000000fd RDI: 00000000000000fa
RBP: 000000000000002d R08: ffffffff8404eca5 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8404ebd0 R12: 000000005770f4b6
R13: ffffc900035beaa0 R14: ffff8880778c06e8 R15: 1ffff920006b7d45
FS:  000055559514f380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd24b68da8 CR3: 000000002de70000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/05 06:06 linux-next 9221b2819b8a 610f2a54 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root kernel BUG in bch2_alloc_v4_invalid
2024/05/05 05:49 linux-next 9221b2819b8a 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel BUG in bch2_alloc_v4_invalid
2024/05/28 23:05 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci fda5695d692c 34889ee3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in bch2_alloc_v4_invalid
* Struck through repros no longer work on HEAD.