IPVS: Creating netns size=2552 id=9 INFO: task syz-executor0:5805 blocked for more than 120 seconds. Not tainted 4.4.116-g17c7c49 #17 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D ffff8801c074f768 28736 5805 3847 0x00000004 ffff8801c074f768 0000000000000000 0000000000000000 0000000000000000 0000000000000001 ffff8801c074f700 ffff8801db31fdb8 ffff8801db31fde0 ffff8801db31f4d8 ffff8801d9b49800 ffff8801c06ee000 0000000000000000 Call Trace: [] schedule+0x7a/0x1b0 kernel/sched/core.c:3353 [] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3386 [] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [] mutex_lock_nested+0x306/0x850 kernel/locking/mutex.c:621 [] odev_open+0x5f/0x90 sound/core/seq/oss/seq_oss.c:136 [] soundcore_open+0x321/0x630 sound/sound_core.c:639 [] chrdev_open+0x22b/0x4c0 fs/char_dev.c:388 [] do_dentry_open+0x59b/0xba0 fs/open.c:749 [] vfs_open+0x110/0x210 fs/open.c:862 [] do_last fs/namei.c:3217 [inline] [] path_openat+0x923/0x3940 fs/namei.c:3353 [] do_filp_open+0x197/0x290 fs/namei.c:3388 [] do_sys_open+0x369/0x660 fs/open.c:1038 [] SYSC_openat fs/open.c:1065 [inline] [] SyS_openat+0x30/0x40 fs/open.c:1059 [] entry_SYSCALL_64_fastpath+0x1c/0x98 INFO: lockdep is turned off. Sending NMI to all CPUs: NMI backtrace for cpu 0 CPU: 0 PID: 485 Comm: khungtaskd Not tainted 4.4.116-g17c7c49 #17 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8800bac6e000 task.stack: ffff8800bad20000 RIP: 0010:[] [] native_apic_mem_write arch/x86/include/asm/apic.h:94 [inline] RIP: 0010:[] [] __default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline] RIP: 0010:[] [] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:61 [inline] RIP: 0010:[] [] flat_send_IPI_mask+0xf7/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69 RSP: 0018:ffff8800bad27cb8 EFLAGS: 00000046 RAX: 0000000003000000 RBX: 0000000000000c00 RCX: ffffffff8126a2f2 RDX: 0000000000000c00 RSI: 0000000000000002 RDI: ffffffffff5fb300 RBP: ffff8800bad27ce0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: fffffbfff0ad7e24 R12: 0000000000000246 R13: 0000000000000003 R14: ffffffff8426f3e0 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f13cd463000 CR3: 00000001c8620000 CR4: 0000000000160670 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffffff8426f3e0 ffffffff847ef800 fffffbfff08fd9b4 dffffc0000000000 ffff8801db31bca0 ffff8800bad27d00 ffffffff810b99eb ffffffff839f61c0 0000000000000003 ffff8800bad27d60 ffffffff81d0eed4 0000000000000001 Call Trace: [] nmi_raise_cpu_backtrace+0x5b/0x70 arch/x86/kernel/apic/hw_nmi.c:33 [] nmi_trigger_all_cpu_backtrace+0x4a4/0x550 lib/nmi_backtrace.c:85 [] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 [] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline] [] check_hung_task kernel/hung_task.c:125 [inline] [] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [] watchdog+0x6fa/0xae0 kernel/hung_task.c:238 [] kthread+0x268/0x300 kernel/kthread.c:211 [] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:506 Code: b3 5f ff f6 c4 10 75 e1 44 89 e8 c1 e0 18 89 04 25 10 b3 5f ff 44 89 fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 b3 5f ff <41> f7 c4 00 02 00 00 74 1a e8 7b 2f 17 00 4c 89 e7 57 9d 0f 1f NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.116-g17c7c49 #17 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801d9b49800 task.stack: ffff8801d9b58000 RIP: 0010:[] [] native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:49 RSP: 0018:ffff8801d9b5fd98 EFLAGS: 00000246 RAX: 0000000000000003 RBX: ffffffff847dd908 RCX: ffffffff81d63d1b RDX: 0000000000000004 RSI: ffffffff839fe320 RDI: ffffffff84418180 RBP: ffff8801d9b5fd98 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 1ffff1003b36bf82 R12: 0000000000000001 R13: fffffbfff070887c R14: ffffffff847ebc78 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc55d48f000 CR3: 00000001c86dc000 CR4: 0000000000160670 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff8801d9b5fdd0 ffffffff81027ed5 ffff8801d9b60000 ffffffff847dd908 fffffbfff070887c ffffffff847ebc78 0000000000000000 ffff8801d9b5fde0 ffffffff8102944a ffff8801d9b5fdf8 ffffffff812214c8 dffffc0000000000 Call Trace: [] arch_safe_halt arch/x86/include/asm/paravirt.h:117 [inline] [] default_idle+0x55/0x3c0 arch/x86/kernel/process.c:290 [] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:281 [] default_idle_call+0x48/0x70 kernel/sched/idle.c:93 [] cpuidle_idle_call kernel/sched/idle.c:157 [inline] [] cpu_idle_loop kernel/sched/idle.c:253 [inline] [] cpu_startup_entry+0x5fd/0x8f0 kernel/sched/idle.c:301 [] start_secondary+0x304/0x3e0 arch/x86/kernel/smpboot.c:242 Code: 00 00 00 00 00 55 48 89 e5 fa 5d c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 fb 5d c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 5d c3 66 0f 1f 84