syzbot


kernel BUG in btrfs_exclop_balance (2)

Status: fixed on 2023/07/01 16:05
Subsystems: btrfs
[Documentation on labels]
Reported-by: syzbot+5e466383663438b99b44@syzkaller.appspotmail.com
Fix commit: ac868bc9d136 btrfs: fix assertion of exclop condition when starting balance
First crash: 436d, last: 319d
Cause bisection: failed (error log, bisect log)
  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [btrfs?] kernel BUG in btrfs_exclop_balance (2) 2 (4) 2023/06/06 14:07
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in btrfs_exclop_balance btrfs 1 439d 439d 0/26 closed as invalid on 2023/02/08 16:28
linux-6.1 kernel BUG in btrfs_exclop_balance origin:upstream missing-backport C done 1 143d 320d 0/3 upstream: reported C repro on 2023/06/04 20:48
Fix bisection attempts (1)
Created Duration User Patch Repo Result
2023/06/05 22:29 51m bisect fix upstream job log (0) log

Sample crash report:
assertion failed: fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED, in fs/btrfs/ioctl.c:463
------------[ cut here ]------------
kernel BUG at fs/btrfs/messages.c:259!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8630 Comm: syz-executor102 Not tainted 6.3.0-syzkaller-13225-g7163a2111f6c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
RIP: 0010:btrfs_assertfail+0x18/0x20 fs/btrfs/messages.c:259
Code: df e8 2c 05 36 f7 e9 50 fb ff ff e8 b2 90 01 00 66 90 66 0f 1f 00 89 d1 48 89 f2 48 89 fe 48 c7 c7 80 32 2c 8b e8 c8 60 ff ff <0f> 0b 66 0f 1f 44 00 00 66 0f 1f 00 53 48 89 fb e8 73 31 de f6 48
RSP: 0018:ffffc9000ae27e48 EFLAGS: 00010246
RAX: 0000000000000066 RBX: 1ffff1100fa13c18 RCX: e812ce05a9b3c300
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000002 R08: ffffffff816f0fec R09: fffff520015c4f7d
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88807d09e0c0
R13: ffff88807d09c000 R14: ffff88807d09c678 R15: dffffc0000000000
FS:  00007f2bb10a8700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2bb0c90000 CR3: 0000000028447000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_exclop_balance+0x153/0x1f0 fs/btrfs/ioctl.c:463
 btrfs_ioctl_balance+0x482/0x7c0 fs/btrfs/ioctl.c:3562
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2bb853ec69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 71 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f2bb10a82f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2bb85c87c0 RCX: 00007f2bb853ec69
RDX: 0000000020000540 RSI: 00000000c4009420 RDI: 0000000000000004
RBP: 00007f2bb85951d0 R08: 00007f2bb10a8700 R09: 0000000000000000
R10: 00007f2bb10a8700 R11: 0000000000000246 R12: 7fffffffffffffff
R13: 0000000100000001 R14: 8000000000000001 R15: 00007f2bb85c87c8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:btrfs_assertfail+0x18/0x20 fs/btrfs/messages.c:259
Code: df e8 2c 05 36 f7 e9 50 fb ff ff e8 b2 90 01 00 66 90 66 0f 1f 00 89 d1 48 89 f2 48 89 fe 48 c7 c7 80 32 2c 8b e8 c8 60 ff ff <0f> 0b 66 0f 1f 44 00 00 66 0f 1f 00 53 48 89 fb e8 73 31 de f6 48
RSP: 0018:ffffc9000ae27e48 EFLAGS: 00010246
RAX: 0000000000000066 RBX: 1ffff1100fa13c18 RCX: e812ce05a9b3c300
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000002 R08: ffffffff816f0fec R09: fffff520015c4f7d
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88807d09e0c0
R13: ffff88807d09c000 R14: ffff88807d09c678 R15: dffffc0000000000
FS:  00007f2bb10a8700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2bb0c90000 CR3: 0000000028447000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/05/06 01:43 upstream 7163a2111f6c de870ca5 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs kernel BUG in btrfs_exclop_balance
2023/05/06 22:29 upstream 2e1e1337881b 90c93c40 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in btrfs_exclop_balance
2023/05/05 22:07 upstream 7163a2111f6c de870ca5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in btrfs_exclop_balance
2023/04/28 05:49 upstream 91ec4b0d11fe 70a605de .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in btrfs_exclop_balance
2023/04/27 07:09 upstream 5c7ecada25d2 19a3dabe .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in btrfs_exclop_balance
2023/04/15 20:33 upstream 7a934f4bd7d6 ec410564 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in btrfs_exclop_balance
2023/04/04 18:05 upstream 148341f0a2f5 928dd177 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in btrfs_exclop_balance
2023/02/09 14:28 upstream 0983f6bf2bfc 14a312c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in btrfs_exclop_balance
* Struck through repros no longer work on HEAD.