------------[ cut here ]------------ rtmutex deadlock detected WARNING: kernel/locking/rtmutex.c:1698 at rt_mutex_handle_deadlock+0x21/0xb0 kernel/locking/rtmutex.c:1698, CPU#1: syz.4.8/5836 Modules linked in: CPU: 1 UID: 0 PID: 5836 Comm: syz.4.8 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:rt_mutex_handle_deadlock+0x21/0xb0 kernel/locking/rtmutex.c:1698 Code: 90 90 90 90 90 90 90 90 90 41 57 41 56 41 55 41 54 53 83 ff dd 0f 85 81 00 00 00 48 89 f7 e8 16 40 01 00 48 8d 3d 0f 4b 69 04 <67> 48 0f b9 3a 4c 8d 3d 00 00 00 00 65 48 8b 1d 33 fd 49 07 4c 8d RSP: 0018:ffffc90005c56870 EFLAGS: 00010286 RAX: 0000000080000000 RBX: 00000000ffffffdd RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8ba92a60 RDI: ffffffff8f8d2dd0 RBP: ffffc90005c56a20 R08: ffffffff8f89c2f7 R09: 1ffffffff1f1385e R10: dffffc0000000000 R11: fffffbfff1f1385f R12: 1ffff92000b8ad1c R13: ffffffff8b23dd02 R14: ffff888035310510 R15: dffffc0000000000 FS: 00007f8b756ad6c0(0000) GS:ffff888126242000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555609e1a68 CR3: 00000000251f0000 CR4: 00000000003526f0 Call Trace: __rt_mutex_slowlock kernel/locking/rtmutex.c:1760 [inline] __rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1787 [inline] rt_mutex_slowlock+0x73c/0x780 kernel/locking/rtmutex.c:1827 __rt_mutex_lock kernel/locking/rtmutex.c:1842 [inline] __mutex_lock_common kernel/locking/rtmutex_api.c:560 [inline] mutex_lock_nested+0x168/0x1d0 kernel/locking/rtmutex_api.c:578 udf_table_free_blocks fs/udf/balloc.c:376 [inline] udf_free_blocks+0xa8c/0x1900 fs/udf/balloc.c:678 udf_delete_aext+0x4f5/0xc00 fs/udf/inode.c:2381 udf_table_new_block fs/udf/balloc.c:646 [inline] udf_new_block+0x142f/0x1c00 fs/udf/balloc.c:726 inode_getblk fs/udf/inode.c:900 [inline] udf_map_block+0x1360/0x4280 fs/udf/inode.c:453 __udf_get_block+0x52/0x250 fs/udf/inode.c:467 __block_write_begin_int+0x6c2/0x1900 fs/buffer.c:2123 block_write_begin+0x8d/0x120 fs/buffer.c:2234 udf_write_begin+0x11a/0x270 fs/udf/inode.c:261 generic_perform_write+0x2ad/0x8b0 mm/filemap.c:4363 udf_file_write_iter+0x2a6/0x630 fs/udf/file.c:112 iter_file_splice_write+0xa36/0x1240 fs/splice.c:736 do_splice_from fs/splice.c:936 [inline] direct_splice_actor+0x104/0x160 fs/splice.c:1159 splice_direct_to_actor+0x586/0xcc0 fs/splice.c:1103 do_splice_direct_actor fs/splice.c:1202 [inline] do_splice_direct+0x19b/0x2a0 fs/splice.c:1228 do_sendfile+0x540/0x7e0 fs/read_write.c:1371 __do_sys_sendfile64 fs/read_write.c:1432 [inline] __se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1418 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8b7747ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8b756ad028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f8b776f6090 RCX: 00007f8b7747ce59 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000005 RBP: 00007f8b77512e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0001000000201005 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8b776f6128 R14: 00007f8b776f6090 R15: 00007fff03a58ab8 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 41 57 push %r15 b: 41 56 push %r14 d: 41 55 push %r13 f: 41 54 push %r12 11: 53 push %rbx 12: 83 ff dd cmp $0xffffffdd,%edi 15: 0f 85 81 00 00 00 jne 0x9c 1b: 48 89 f7 mov %rsi,%rdi 1e: e8 16 40 01 00 call 0x14039 23: 48 8d 3d 0f 4b 69 04 lea 0x4694b0f(%rip),%rdi # 0x4694b39 * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 4c 8d 3d 00 00 00 00 lea 0x0(%rip),%r15 # 0x36 36: 65 48 8b 1d 33 fd 49 mov %gs:0x749fd33(%rip),%rbx # 0x749fd71 3d: 07 3e: 4c rex.WR 3f: 8d .byte 0x8d