------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(lock->magic != lock) WARNING: CPU: 1 PID: 4477 at kernel/locking/mutex.c:575 __mutex_lock_common+0x18fa/0x2390 kernel/locking/mutex.c:-1 Modules linked in: CPU: 1 PID: 4477 Comm: kworker/u4:6 Not tainted 5.15.186-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: writeback wb_workfn (flush-7:1) RIP: 0010:__mutex_lock_common+0x18fa/0x2390 kernel/locking/mutex.c:575 Code: 00 48 8d bc 24 e0 00 00 00 0f 85 47 e8 ff ff 48 c7 c7 c0 00 0b 8a 48 c7 c6 00 01 0b 8a e8 8e bb ec ff 48 8d bc 24 e0 00 00 00 <0f> 0b e9 25 e8 ff ff e8 0a 5e 56 f7 e9 df fb ff ff 0f 0b e9 2d f0 RSP: 0018:ffffc900031df240 EFLAGS: 00010246 RAX: bc633d967bc62700 RBX: ffffffff8229fed7 RCX: ffff88801d65bb80 RDX: 0000000000000000 RSI: 0000000080000000 RDI: ffffc900031df320 RBP: ffffc900031df3e0 R08: dffffc0000000000 R09: ffffed1017224f24 R10: ffffed1017224f24 R11: 1ffff11017224f23 R12: 0000000000000000 R13: 0000000000000000 R14: ffff88806b3321a0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6b31952000 CR3: 0000000079bc6000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 hfsplus_ext_write_extent+0x87/0x200 fs/hfsplus/extents.c:149 hfsplus_write_inode+0x1e/0x5b0 fs/hfsplus/super.c:154 write_inode fs/fs-writeback.c:1495 [inline] __writeback_single_inode+0x6c3/0xda0 fs/fs-writeback.c:1705 writeback_sb_inodes+0x9fe/0x1610 fs/fs-writeback.c:1930 wb_writeback+0x443/0xb90 fs/fs-writeback.c:2104 wb_do_writeback fs/fs-writeback.c:2247 [inline] wb_workfn+0x423/0xe60 fs/fs-writeback.c:2288 process_one_work+0x863/0x1000 kernel/workqueue.c:2310 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287