netlink: 'syz-executor.4': attribute type 1 has an invalid length. netlink: 'syz-executor.4': attribute type 1 has an invalid length. netlink: 'syz-executor.4': attribute type 1 has an invalid length. netlink: 'syz-executor.4': attribute type 1 has an invalid length. INFO: task syz-executor.4:30887 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D27736 30887 8132 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1016 [inline] __mutex_lock+0x5f0/0x1190 kernel/locking/mutex.c:1078 pipe_lock_nested fs/pipe.c:77 [inline] pipe_lock fs/pipe.c:85 [inline] pipe_wait+0x1bd/0x1e0 fs/pipe.c:133 pipe_write+0x5c3/0xf80 fs/pipe.c:500 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x51b/0x770 fs/read_write.c:487 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7ff10f2eb109 Code: Bad RIP value. RSP: 002b:00007ff10dc60168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ff10f3fdf60 RCX: 00007ff10f2eb109 RDX: 00000000fffffecc RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00007ff10f34508d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcf66d827f R14: 00007ff10dc60300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 0000000060cdc75b (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7784: #0: 000000004abd7527 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 1 lock held by syz-executor.4/30887: #0: 0000000097862ea9 (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:77 [inline] #0: 0000000097862ea9 (&pipe->mutex/1){+.+.}, at: pipe_lock fs/pipe.c:85 [inline] #0: 0000000097862ea9 (&pipe->mutex/1){+.+.}, at: pipe_wait+0x1bd/0x1e0 fs/pipe.c:133 3 locks held by syz-executor.4/30891: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/13/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 30891 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/13/2022 RIP: 0010:__lock_is_held+0x60/0x160 kernel/locking/lockdep.c:3725 Code: 89 74 24 04 84 c0 74 08 3c 03 0f 8e ec 00 00 00 41 8b 87 80 08 00 00 31 ed 49 bd 00 00 00 00 00 fc ff df 4d 8d a7 88 08 00 00 <85> c0 7f 4d e9 b8 00 00 00 48 8d 7b 22 48 89 f8 48 c1 e8 03 42 0f RSP: 0018:ffff8880aaa4f430 EFLAGS: 00000046 RAX: 0000000000000002 RBX: 0000000000000286 RCX: ffffc90009653000 RDX: 1ffff11013b91dc0 RSI: 00000000ffffffff RDI: ffff88809dc8ee00 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff88809dc8ee08 R13: dffffc0000000000 R14: ffffffff8dd7cb30 R15: ffff88809dc8e580 FS: 00007ff10dc3f700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f94a2fa9000 CR3: 000000009dea5000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held_type+0x10d/0x210 kernel/locking/lockdep.c:3946 lock_is_held include/linux/lockdep.h:344 [inline] lockdep_nfnl_is_held net/netfilter/nfnetlink.c:75 [inline] nfnetlink_rcv_msg+0xb10/0xf60 net/netfilter/nfnetlink.c:229 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2463 nfnetlink_rcv+0x1b2/0x420 net/netfilter/nfnetlink.c:565 netlink_unicast_kernel net/netlink/af_netlink.c:1325 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1351 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 sock_no_sendpage+0xf5/0x140 net/core/sock.c:2686 kernel_sendpage net/socket.c:3585 [inline] sock_sendpage+0xdf/0x140 net/socket.c:912 pipe_to_sendpage+0x268/0x330 fs/splice.c:452 splice_from_pipe_feed fs/splice.c:503 [inline] __splice_from_pipe+0x389/0x800 fs/splice.c:627 splice_from_pipe fs/splice.c:662 [inline] generic_splice_sendpage+0xd4/0x140 fs/splice.c:833 do_splice_from fs/splice.c:852 [inline] do_splice fs/splice.c:1154 [inline] __do_sys_splice fs/splice.c:1428 [inline] __se_sys_splice+0xfe7/0x16d0 fs/splice.c:1408 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7ff10f2eb109 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff10dc3f168 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007ff10f3fe030 RCX: 00007ff10f2eb109 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007ff10f34508d R08: 000000000004ffe6 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcf66d827f R14: 00007ff10dc3f300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 89 74 24 04 mov %esi,0x4(%rsp) 4: 84 c0 test %al,%al 6: 74 08 je 0x10 8: 3c 03 cmp $0x3,%al a: 0f 8e ec 00 00 00 jle 0xfc 10: 41 8b 87 80 08 00 00 mov 0x880(%r15),%eax 17: 31 ed xor %ebp,%ebp 19: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 20: fc ff df 23: 4d 8d a7 88 08 00 00 lea 0x888(%r15),%r12 * 2a: 85 c0 test %eax,%eax <-- trapping instruction 2c: 7f 4d jg 0x7b 2e: e9 b8 00 00 00 jmpq 0xeb 33: 48 8d 7b 22 lea 0x22(%rbx),%rdi 37: 48 89 f8 mov %rdi,%rax 3a: 48 c1 e8 03 shr $0x3,%rax 3e: 42 rex.X 3f: 0f .byte 0xf