===================================== WARNING: bad unlock balance detected! 6.11.0-rc2-syzkaller-00011-geb5e56d14912 #0 Not tainted ------------------------------------- syz.0.4716/22939 is trying to release lock (&sb->s_type->i_mutex_key) at: [] 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.0.4716/22939: #0: ffff8880644ba420 (sb_writers#13){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x220 fs/splice.c:1163 stack backtrace: CPU: 1 UID: 0 PID: 22939 Comm: syz.0.4716 Not tainted 6.11.0-rc2-syzkaller-00011-geb5e56d14912 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Call Trace: __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 iter_file_splice_write+0xbd9/0x14e0 fs/splice.c:743 do_splice_from fs/splice.c:941 [inline] direct_splice_actor+0x120/0x220 fs/splice.c:1164 splice_direct_to_actor+0x590/0xc90 fs/splice.c:1108 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0x28c/0x3e0 fs/splice.c:1233 do_sendfile+0x56d/0xe20 fs/read_write.c:1295 __do_sys_sendfile64 fs/read_write.c:1362 [inline] __se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1348 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: 0033:0x7f9ee01779f9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9ee0fa4048 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f9ee0306058 RCX: 00007f9ee01779f9 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000006 RBP: 00007f9ee01e58ee R08: 0000000000000000 R09: 0000000000000000 R10: 0000000100000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f9ee0306058 R15: 00007ffcff5f1878 ------------[ cut here ]------------ DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff88807dff9e70, owner = 0x1, curr 0xffff88802a600000, list empty WARNING: CPU: 0 PID: 22939 at kernel/locking/rwsem.c:1370 __up_write kernel/locking/rwsem.c:1369 [inline] WARNING: CPU: 0 PID: 22939 at kernel/locking/rwsem.c:1370 up_write+0x502/0x590 kernel/locking/rwsem.c:1632 Modules linked in: CPU: 0 UID: 0 PID: 22939 Comm: syz.0.4716 Not tainted 6.11.0-rc2-syzkaller-00011-geb5e56d14912 #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 0a 8c 48 c7 c6 20 cb 0a 8c 48 8b 54 24 28 48 8b 4c 24 18 4d 89 e0 4c 8b 4c 24 30 53 e8 83 9c e6 ff 48 83 c4 08 90 <0f> 0b 90 90 e9 6a fd ff ff 48 c7 c1 d0 f1 17 90 80 e1 07 80 c1 03 RSP: 0018:ffffc90003eaf400 EFLAGS: 00010296 RAX: a3ebae4b1a3bdf00 RBX: ffffffff8c0ac980 RCX: 0000000000040000 RDX: ffffc90009801000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc90003eaf4d0 R08: ffffffff8155a2d2 R09: fffffbfff1cfa0d8 R10: dffffc0000000000 R11: fffffbfff1cfa0d8 R12: 0000000000000001 R13: ffff88807dff9e70 R14: 1ffff920007d5e88 R15: dffffc0000000000 FS: 00007f9ee0fa46c0(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055d654356038 CR3: 0000000060bb6000 CR4: 0000000000350ef0 Call Trace: btrfs_direct_write+0x91f/0xb40 fs/btrfs/direct-io.c:920 btrfs_do_write_iter+0x2a1/0x760 fs/btrfs/file.c:1505 iter_file_splice_write+0xbd9/0x14e0 fs/splice.c:743 do_splice_from fs/splice.c:941 [inline] direct_splice_actor+0x120/0x220 fs/splice.c:1164 splice_direct_to_actor+0x590/0xc90 fs/splice.c:1108 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0x28c/0x3e0 fs/splice.c:1233 do_sendfile+0x56d/0xe20 fs/read_write.c:1295 __do_sys_sendfile64 fs/read_write.c:1362 [inline] __se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1348 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: 0033:0x7f9ee01779f9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9ee0fa4048 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f9ee0306058 RCX: 00007f9ee01779f9 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000006 RBP: 00007f9ee01e58ee R08: 0000000000000000 R09: 0000000000000000 R10: 0000000100000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f9ee0306058 R15: 00007ffcff5f1878