Re: [syzbot] [bcachefs?] WARNING in bch2_trans_put

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    e9b8ffafd20a Merge tag 'usb-6.13-rc4' of git://git.kernel...
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=10b47e0f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1234f097ee657d8b
dashboard link: https://syzkaller.appspot.com/bug?extid=291aef749c5cbb9ca2fd
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10246f30580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=176540c4580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d0a298a7e2d5/disk-e9b8ffaf.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/361b2225724c/vmlinux-e9b8ffaf.xz
kernel image: https://storage.googleapis.com/syzbot-assets/033556a82b6e/bzImage-e9b8ffaf.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/6fe2d0cb8e91/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+291aef749c5cbb9ca2fd@xxxxxxxxxxxxxxxxxxxxxxxxx

bcachefs (loop0): btree_node_read_work: rewriting btree node at btree=extents level=0 SPOS_MAX due to error
------------[ cut here ]------------
btree trans held srcu lock (delaying memory reclaim) for 11 seconds
WARNING: CPU: 1 PID: 5823 at fs/bcachefs/btree_iter.c:3030 check_srcu_held_too_long fs/bcachefs/btree_iter.c:3028 [inline]
WARNING: CPU: 1 PID: 5823 at fs/bcachefs/btree_iter.c:3030 bch2_trans_put+0xd45/0xf00 fs/bcachefs/btree_iter.c:3274
Modules linked in:
CPU: 1 UID: 0 PID: 5823 Comm: syz-executor422 Not tainted 6.13.0-rc3-syzkaller-00193-ge9b8ffafd20a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:check_srcu_held_too_long fs/bcachefs/btree_iter.c:3028 [inline]
RIP: 0010:bch2_trans_put+0xd45/0xf00 fs/bcachefs/btree_iter.c:3274
Code: 1c 24 48 c1 eb 02 48 b9 c3 f5 28 5c 8f c2 f5 28 48 89 d8 48 f7 e1 48 c1 ea 02 48 c7 c7 40 28 51 8c 48 89 d6 e8 5c 4e 42 fd 90 <0f> 0b 90 90 e9 af f8 ff ff e8 1d ab 81 fd 90 0f 0b 90 e9 f2 f8 ff
RSP: 0018:ffffc90003f3f300 EFLAGS: 00010246
RAX: daf39d7b7a91ab00 RBX: 0000000000000113 RCX: ffff88802414bc00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff81601962 R09: 1ffff920007e7dfc
R10: dffffc0000000000 R11: fffff520007e7dfd R12: ffff888029d10070
R13: 1ffff110053a200e R14: ffff888029d10042 R15: 1ffff110053a2008
FS:  0000555580eef380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f95f5c24990 CR3: 0000000076fc2000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_btree_root_read+0x6d6/0x7a0 fs/bcachefs/btree_io.c:1771
 read_btree_roots+0x296/0x840 fs/bcachefs/recovery.c:523
 bch2_fs_recovery+0x2585/0x39d0 fs/bcachefs/recovery.c:853
 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1037
 bch2_fs_get_tree+0xd68/0x1710 fs/bcachefs/fs.c:2170
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034
 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: 0033:0x7f95f5bf2eda
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:00007ffd6fea95b8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffd6fea95c0 RCX: 00007f95f5bf2eda
RDX: 00000000200058c0 RSI: 0000000020005900 RDI: 00007ffd6fea95c0
RBP: 0000000000000004 R08: 00007ffd6fea9600 R09: 00000000000058fe
R10: 0000000000000001 R11: 0000000000000282 R12: 00007ffd6fea9600
R13: 0000000000000003 R14: 0000000001000000 R15: 00007f95f5c3a03b
 </TASK>


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