[syzbot] [btrfs?] WARNING in btrfs_commit_transaction (2)

[syzbot] [btrfs?] WARNING in btrfs_commit_transaction (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    00c7b5f4ddc5 Merge tag 'input-for-v6.3-rc4' of git://git.k..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=138b98c9c80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e626f76ad59b1c14
dashboard link: https://syzkaller.appspot.com/bug?extid=dafbca0e20fbc5946925
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4738db235f4a/disk-00c7b5f4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/db62da5dcb6b/vmlinux-00c7b5f4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1e596cad760c/bzImage-00c7b5f4.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dafbca0e20fbc5946925@syzkaller.appspotmail.com

BTRFS info (device loop5): auto enabling async discard
BTRFS warning (device loop5: state M): Skipping commit of aborted transaction.
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: CPU: 0 PID: 28430 at fs/btrfs/transaction.c:1984 cleanup_transaction fs/btrfs/transaction.c:1984 [inline]
WARNING: CPU: 0 PID: 28430 at fs/btrfs/transaction.c:1984 btrfs_commit_transaction+0x34c6/0x4410 fs/btrfs/transaction.c:2558
Modules linked in:
CPU: 0 PID: 28430 Comm: syz-executor.5 Not tainted 6.3.0-rc4-syzkaller-00224-g00c7b5f4ddc5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
RIP: 0010:cleanup_transaction fs/btrfs/transaction.c:1984 [inline]
RIP: 0010:btrfs_commit_transaction+0x34c6/0x4410 fs/btrfs/transaction.c:2558
Code: c8 fe ff ff be 02 00 00 00 e8 f6 c5 ab 00 e9 7e d0 ff ff e8 4c d1 1e fe 8b b5 20 ff ff ff 48 c7 c7 a0 89 94 8a e8 7a 57 e7 fd <0f> 0b c7 85 00 ff ff ff 01 00 00 00 e9 d0 dc ff ff e8 24 d1 1e fe
RSP: 0018:ffffc900043efa48 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000044ea0001 RCX: ffffc90003c0b000
RDX: 0000000000040000 RSI: ffffffff814a8037 RDI: 0000000000000001
RBP: ffffc900043efbc8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888044ea0000
R13: ffff88803479ac60 R14: ffff88803479adc8 R15: ffff888044ea0000
FS:  00007f69217cb700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002024a030 CR3: 0000000047942000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_set_free_space_cache_v1_active+0x1ae/0x2a0 fs/btrfs/free-space-cache.c:4139
 btrfs_remount_cleanup fs/btrfs/super.c:1677 [inline]
 btrfs_remount+0x57b/0x1850 fs/btrfs/super.c:1867
 legacy_reconfigure+0x119/0x180 fs/fs_context.c:633
 reconfigure_super+0x40c/0xa30 fs/super.c:956
 vfs_fsconfig_locked fs/fsopen.c:254 [inline]
 __do_sys_fsconfig+0xa3a/0xc20 fs/fsopen.c:439
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f6920a8c0f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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:00007f69217cb168 EFLAGS: 00000246 ORIG_RAX: 00000000000001af
RAX: ffffffffffffffda RBX: 00007f6920babf80 RCX: 00007f6920a8c0f9
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000004
RBP: 00007f6920ae7b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe61745aff R14: 00007f69217cb300 R15: 0000000000022000
 </TASK>


---
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Re: [syzbot] [btrfs?] WARNING in btrfs_commit_transaction (2)

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    ae8373a5add4 Merge tag 'x86_urgent_for_6.4-rc4' of git://g..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=17b3b489280000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f389ffdf4e9ba3f0
dashboard link: https://syzkaller.appspot.com/bug?extid=dafbca0e20fbc5946925
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14243ef9280000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16c06772280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/2c5ee189dd12/disk-ae8373a5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/63acf75623d7/vmlinux-ae8373a5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/29de65c99e9d/bzImage-ae8373a5.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/2eac0114b435/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dafbca0e20fbc5946925@syzkaller.appspotmail.com

BTRFS warning (device loop0): Skipping commit of aborted transaction.
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: CPU: 0 PID: 41 at fs/btrfs/transaction.c:1978 cleanup_transaction fs/btrfs/transaction.c:1978 [inline]
WARNING: CPU: 0 PID: 41 at fs/btrfs/transaction.c:1978 btrfs_commit_transaction+0x3223/0x3fa0 fs/btrfs/transaction.c:2565
Modules linked in:
CPU: 0 PID: 41 Comm: kworker/u4:2 Not tainted 6.4.0-rc3-syzkaller-00008-gae8373a5add4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
Workqueue: events_unbound btrfs_async_reclaim_metadata_space
RIP: 0010:cleanup_transaction fs/btrfs/transaction.c:1978 [inline]
RIP: 0010:btrfs_commit_transaction+0x3223/0x3fa0 fs/btrfs/transaction.c:2565
Code: c8 fe ff ff be 02 00 00 00 e8 f9 41 aa 00 e9 21 d3 ff ff e8 af 68 1b fe 8b b5 20 ff ff ff 48 c7 c7 c0 25 95 8a e8 2d 28 e3 fd <0f> 0b c7 85 00 ff ff ff 01 00 00 00 e9 97 df ff ff e8 87 68 1b fe
RSP: 0018:ffffc90000b27990 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 000000001f0d8001 RCX: 0000000000000000
RDX: ffff888014aa0000 RSI: ffffffff814c03e7 RDI: 0000000000000001
RBP: ffffc90000b27b00 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff88801f0d8000
R13: ffff888074df3e98 R14: ffff888074df4000 R15: ffff88801f0d8000
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055bc77452c28 CR3: 0000000072dfb000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 flush_space+0x1e0/0xde0 fs/btrfs/space-info.c:808
 btrfs_async_reclaim_metadata_space+0x39e/0xa90 fs/btrfs/space-info.c:1078
 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405
 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>


---
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#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

Re: [syzbot] [btrfs?] WARNING in btrfs_commit_transaction (2)

[syzbot]

syzbot has bisected this issue to:

commit 2b9ac22b12a266eb4fec246a07b504dd4983b16b
Author: Kristian Klausen <kristian@klausen.dk>
Date:   Fri Jun 18 11:51:57 2021 +0000

    loop: Fix missing discard support when using LOOP_CONFIGURE

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15dfb0f4680000
start commit:   57012c57536f Merge tag 'net-6.5-rc4' of git://git.kernel.o..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=17dfb0f4680000
console output: https://syzkaller.appspot.com/x/log.txt?x=13dfb0f4680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5f28dfd7d77a7042
dashboard link: https://syzkaller.appspot.com/bug?extid=dafbca0e20fbc5946925
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=173a6716a80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=111c7c7ea80000

Reported-by: syzbot+dafbca0e20fbc5946925@syzkaller.appspotmail.com
Fixes: 2b9ac22b12a2 ("loop: Fix missing discard support when using LOOP_CONFIGURE")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection