===================================== WARNING: bad unlock balance detected! 6.11.0-rc2-syzkaller-00004-gb446a2dae984 #0 Not tainted ------------------------------------- syz.0.1/5300 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.0.1/5300: #0: ffff88807b92c420 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2876 [inline] (sb_writers#12){.+.+}-{0:0}, at: vfs_writev+0x2d4/0xbb0 fs/read_write.c:969 stack backtrace: CPU: 0 UID: 0 PID: 5300 Comm: syz.0.1 Not tainted 6.11.0-rc2-syzkaller-00004-gb446a2dae984 #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 do_iter_readv_writev+0x60a/0x890 vfs_writev+0x37c/0xbb0 fs/read_write.c:971 do_pwritev fs/read_write.c:1072 [inline] __do_sys_pwritev2 fs/read_write.c:1131 [inline] __se_sys_pwritev2+0x1ca/0x2d0 fs/read_write.c:1122 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: 0033:0x7fde3ad779f9 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:00007fde3bb5d048 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007fde3af05f80 RCX: 00007fde3ad779f9 RDX: 0000000000000001 RSI: 0000000020000240 RDI: 000000000000000a RBP: 00007fde3ade58ee R08: 0000000000000000 R09: 0000000000000003 R10: 0000000000007000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fde3af05f80 R15: 00007fff6972e058 ------------[ cut here ]------------ DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff88805cb08478, owner = 0x0, curr 0xffff888020218000, list empty WARNING: CPU: 1 PID: 5300 at kernel/locking/rwsem.c:1370 __up_write kernel/locking/rwsem.c:1369 [inline] WARNING: CPU: 1 PID: 5300 at kernel/locking/rwsem.c:1370 up_write+0x502/0x590 kernel/locking/rwsem.c:1632 Modules linked in: CPU: 1 UID: 0 PID: 5300 Comm: syz.0.1 Not tainted 6.11.0-rc2-syzkaller-00004-gb446a2dae984 #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 13 9c e6 ff 48 83 c4 08 90 <0f> 0b 90 90 e9 6a fd ff ff 48 c7 c1 c0 c5 f6 8f 80 e1 07 80 c1 03 RSP: 0018:ffffc9000414f760 EFLAGS: 00010296 RAX: 0d21f46eb164e700 RBX: ffffffff8beac980 RCX: 0000000000040000 RDX: ffffc90004932000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc9000414f830 R08: ffffffff8155a1e2 R09: 1ffff92000829e8c R10: dffffc0000000000 R11: fffff52000829e8d R12: 0000000000000000 R13: ffff88805cb08478 R14: 1ffff92000829ef4 R15: dffffc0000000000 FS: 00007fde3bb5d6c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2835bff000 CR3: 000000002e6a2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: btrfs_direct_write+0x91f/0xb40 fs/btrfs/direct-io.c:920 btrfs_do_write_iter+0x2a1/0x760 fs/btrfs/file.c:1505 do_iter_readv_writev+0x60a/0x890 vfs_writev+0x37c/0xbb0 fs/read_write.c:971 do_pwritev fs/read_write.c:1072 [inline] __do_sys_pwritev2 fs/read_write.c:1131 [inline] __se_sys_pwritev2+0x1ca/0x2d0 fs/read_write.c:1122 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: 0033:0x7fde3ad779f9 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:00007fde3bb5d048 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007fde3af05f80 RCX: 00007fde3ad779f9 RDX: 0000000000000001 RSI: 0000000020000240 RDI: 000000000000000a RBP: 00007fde3ade58ee R08: 0000000000000000 R09: 0000000000000003 R10: 0000000000007000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fde3af05f80 R15: 00007fff6972e058