Kernel bug: WARNING: bad unlock balance in btrfs_direct_write
Subsystem: btrfs
Status: fixed

Crash report:
=====================================
WARNING: bad unlock balance detected!
6.11.0-rc1-syzkaller-00062-ge4fc196f5ba3 #0 Not tainted
-------------------------------------
syz-executor334/5219 is trying to release lock (&sb->s_type->i_mutex_key) at:
[<ffffffff83d47c3f>] btrfs_direct_write+0x91f/0xb40 fs/btrfs/direct-io.c:920
but there are no more locks to release!

other info that might help us debug this:
1 lock held by syz-executor334/5219:
 #0: ffff888026aee420 (sb_writers#9){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2876 [inline]
 #0: ffff888026aee420 (sb_writers#9){.+.+}-{0:0}, at: vfs_write+0x227/0xc90 fs/read_write.c:586

stack backtrace:
CPU: 0 UID: 0 PID: 5219 Comm: syz-executor334 Not tainted 6.11.0-rc1-syzkaller-00062-ge4fc196f5ba3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 print_unlock_imbalance_bug+0x256/0x2c0 kernel/locking/lockdep.c:5199
 __lock_release kernel/locking/lockdep.c:5436 [inline]
 lock_release+0x5cb/0xa30 kernel/locking/lockdep.c:5780
 up_write+0x79/0x590 kernel/locking/rwsem.c:1631
 btrfs_direct_write+0x91f/0xb40 fs/btrfs/direct-io.c:920
 btrfs_do_write_iter+0x2a1/0x760 fs/btrfs/file.c:1505
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa72/0xc90 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 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: 0033:0x7fb1e35fc169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 21 18 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:00007ffcc8975c58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0073746e6576652e RCX: 00007fb1e35fc169
RDX: 0000000000182000 RSI: 0000000020000000 RDI: 0000000000000005
RBP: 652e79726f6d656d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcc8975ca0
R13: 00007ffcc8975ce0 R14: 0000000001000000 R15: 0000000000000003
 </TASK>
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff888073c98d20, owner = 0x0, curr 0xffff88807dba1e00, list empty
WARNING: CPU: 1 PID: 5219 at kernel/locking/rwsem.c:1370 __up_write kernel/locking/rwsem.c:1369 [inline]
WARNING: CPU: 1 PID: 5219 at kernel/locking/rwsem.c:1370 up_write+0x502/0x590 kernel/locking/rwsem.c:1632
Modules linked in:
CPU: 1 UID: 0 PID: 5219 Comm: syz-executor334 Not tainted 6.11.0-rc1-syzkaller-00062-ge4fc196f5ba3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:__up_write kernel/locking/rwsem.c:1369 [inline]
RIP: 0010:up_write+0x502/0x590 kernel/locking/rwsem.c:1632
Code: c7 c7 a0 c8 ea 8b 48 c7 c6 20 cb ea 8b 48 8b 54 24 28 48 8b 4c 24 18 4d 89 e0 4c 8b 4c 24 30 53 e8 d3 9c e6 ff 48 83 c4 08 90 <0f> 0b 90 90 e9 6a fd ff ff 48 c7 c1 00 a9 f6 8f 80 e1 07 80 c1 03
RSP: 0018:ffffc900033cf920 EFLAGS: 00010292
RAX: b9b6859016ed5300 RBX: ffffffff8beac980 RCX: ffff88807dba1e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900033cf9f0 R08: ffffffff81559202 R09: 1ffff92000679ec4
R10: dffffc0000000000 R11: fffff52000679ec5 R12: 0000000000000000
R13: ffff888073c98d20 R14: 1ffff92000679f2c R15: dffffc0000000000
FS:  000055556574c380(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559a77f63218 CR3: 0000000077ac4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_direct_write+0x91f/0xb40 fs/btrfs/direct-io.c:920
 btrfs_do_write_iter+0x2a1/0x760 fs/btrfs/file.c:1505
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa72/0xc90 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 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: 0033:0x7fb1e35fc169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 21 18 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:00007ffcc8975c58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0073746e6576652e RCX: 00007fb1e35fc169
RDX: 0000000000182000 RSI: 0000000020000000 RDI: 0000000000000005
RBP: 652e79726f6d656d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcc8975ca0
R13: 00007ffcc8975ce0 R14: 0000000001000000 R15: 0000000000000003
 </TASK>