device lo entered promiscuous mode IPVS: Creating netns size=2552 id=120 INFO: task syz-executor0:3876 blocked for more than 140 seconds. Not tainted 4.4.139-g7ba5557 #66 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D ffff8800a587fa68 27648 3876 1 0x00000004 ffff8800a587fa68 0000000000000000 ffff8801d94ed0e0 ffffed003b29da1b ffff8801d94ec800 ffff8801db31fdb8 ffff8801db31fde0 ffff8801db31f4d8 ffff8801db31f4c0 ffff8801c8329800 ffff8801d94ec800 0000000000000000 Call Trace: [] schedule+0x7a/0x1b0 kernel/sched/core.c:3359 [] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3392 [] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [] mutex_lock_nested+0x307/0x850 kernel/locking/mutex.c:621 [] lo_ioctl+0x8b/0x1ad0 drivers/block/loop.c:1355 [] __blkdev_driver_ioctl block/ioctl.c:288 [inline] [] blkdev_ioctl+0x7b8/0x19c0 block/ioctl.c:584 [] block_ioctl+0xde/0x120 fs/block_dev.c:1625 [] vfs_ioctl fs/ioctl.c:43 [inline] [] file_ioctl fs/ioctl.c:470 [inline] [] do_vfs_ioctl+0x63f/0xf40 fs/ioctl.c:605 [] SYSC_ioctl fs/ioctl.c:622 [inline] [] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:613 [] entry_SYSCALL_64_fastpath+0x22/0x9e 1 lock held by syz-executor0/3876: #0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [] lo_ioctl+0x8b/0x1ad0 drivers/block/loop.c:1355 Sending NMI to all CPUs: NMI backtrace for cpu 0 CPU: 0 PID: 492 Comm: khungtaskd Not tainted 4.4.139-g7ba5557 #66 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8800bb3f8000 task.stack: ffff8800bac50000 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+0xf6/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69 RSP: 0018:ffff8800bac57cc8 EFLAGS: 00000046 RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000 RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300 RBP: ffff8800bac57cf0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000246 R13: 0000000000000003 R14: 0000000000000002 R15: ffffffff8446f6a0 FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6fbd476000 CR3: 00000000b0b1e000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffffff8446f6a0 ffffffff84a18ca0 0000000000000007 fffffbfff0942c44 0000000000000040 ffff8800bac57d10 ffffffff810b5b01 ffffffff83c0b2a0 0000000000000003 ffff8800bac57d68 ffffffff81e18603 ffffffff8140dd6f Call Trace: [] nmi_raise_cpu_backtrace+0x61/0x80 arch/x86/kernel/apic/hw_nmi.c:33 [] nmi_trigger_all_cpu_backtrace.cold.4+0x70/0xad 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.cold.1+0xd3/0xee kernel/hung_task.c:238 [] kthread+0x268/0x300 kernel/kthread.c:211 [] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:510 Code: b3 5f ff f6 c4 10 75 e2 44 89 e8 c1 e0 18 89 04 25 10 b3 5f ff 44 89 f2 09 da 80 cf 04 41 83 fe 02 0f 44 d3 89 14 25 00 b3 5f ff <41> f7 c4 00 02 00 00 75 1a 4c 89 e7 57 9d 0f 1f 44 00 00 e8 e2 NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.139-g7ba5557 #66 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801d9a41800 task.stack: ffff8801d9a50000 RIP: 0010:[] [] atomic_inc arch/x86/include/asm/atomic.h:92 [inline] RIP: 0010:[] [] __lock_acquire+0x5fb/0x5270 kernel/locking/lockdep.c:3105 RSP: 0018:ffff8801d9a57a40 EFLAGS: 00000006 RAX: 0000000000000000 RBX: ffffffff853997b0 RCX: 1ffff1003b6632cc RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff8801db319660 RBP: ffff8801d9a57be0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff83a44740 R11: ffff8801d9a41800 R12: 0000000000000000 R13: ffff8801db319658 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001a2b000 CR3: 00000000b0b1e000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: 1ffff1003b34af4a 0000000000057480 0000000041b58ab3 ffffffff841e96b8 ffffffff8122f030 0000000000000000 ffff8801d9a57c18 0000000000000046 ffff8801d9a57aa8 0000000000000046 0000000000000003 ffff8801d9a420e0 Call Trace: [] lock_acquire+0x15e/0x450 kernel/locking/lockdep.c:3592 [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:112 [inline] [] _raw_spin_lock_irqsave+0x4e/0x70 kernel/locking/spinlock.c:159 [] lock_hrtimer_base.isra.18+0x75/0x130 kernel/time/hrtimer.c:152 [] hrtimer_try_to_cancel+0xca/0x660 kernel/time/hrtimer.c:1057 [] hrtimer_cancel+0x22/0x40 kernel/time/hrtimer.c:1080 [] tick_nohz_restart+0x1e/0x190 kernel/time/tick-sched.c:559 [] tick_nohz_restart_sched_tick kernel/time/tick-sched.c:726 [inline] [] tick_nohz_idle_exit+0x247/0x3d0 kernel/time/tick-sched.c:946 [] cpu_idle_loop kernel/sched/idle.c:267 [inline] [] cpu_startup_entry+0x2a7/0x780 kernel/sched/idle.c:301 [] start_secondary+0x324/0x400 arch/x86/kernel/smpboot.c:242 Code: 49 8d 7c c5 08 48 89 f9 48 c1 e9 03 80 3c 11 00 0f 85 94 36 00 00 49 8b 5c c5 08 48 85 db 0f 84 21 22 00 00 f0 ff 83 98 01 00 00 <49> 8d 83 d8 08 00 00 48 89 c2 48 89 44 24 68 48 b8 00 00 00 00