IPVS: Creating netns size=2552 id=10 INFO: task blkid:6644 blocked for more than 120 seconds. Not tainted 4.4.104-ged884eb #2 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. blkid D ffff8801d313f7a0 28168 6644 1844 0x00000006 ffff8801d313f7a0 ffff8800b7995f00 ffff8800b7995f00 0000000000000000 0000000000000007 ffff8800b7995f00 ffff8801db41f838 ffff8801db41f860 ffff8801db41ef58 ffffffff84214840 ffff8800b7995f00 ffff8801d3138000 Call Trace: [] schedule+0x9a/0x1c0 /syzkaller/managers/android-44-kasan-gce/kernel/kernel/sched/core.c:3351 [] schedule_preempt_disabled+0x13/0x20 /syzkaller/managers/android-44-kasan-gce/kernel/kernel/sched/core.c:3384 [] __mutex_lock_common /syzkaller/managers/android-44-kasan-gce/kernel/kernel/locking/mutex.c:582 [inline] [] mutex_lock_nested+0x306/0x850 /syzkaller/managers/android-44-kasan-gce/kernel/kernel/locking/mutex.c:621 [] blkdev_put+0x25/0x4c0 /syzkaller/managers/android-44-kasan-gce/kernel/fs/block_dev.c:1558 [] blkdev_close+0x88/0xd0 /syzkaller/managers/android-44-kasan-gce/kernel/fs/block_dev.c:1607 [] __fput+0x202/0x6c0 /syzkaller/managers/android-44-kasan-gce/kernel/fs/file_table.c:208 [] ____fput+0x9/0x10 /syzkaller/managers/android-44-kasan-gce/kernel/fs/file_table.c:244 [] task_work_run+0xd8/0x160 /syzkaller/managers/android-44-kasan-gce/kernel/kernel/task_work.c:115 [] exit_task_work /syzkaller/managers/android-44-kasan-gce/kernel/include/linux/task_work.h:21 [inline] [] do_exit+0x7b9/0x2ab0 /syzkaller/managers/android-44-kasan-gce/kernel/kernel/exit.c:753 [] do_group_exit+0xf4/0x2f0 /syzkaller/managers/android-44-kasan-gce/kernel/kernel/exit.c:883 [] get_signal+0x4c2/0x16a0 /syzkaller/managers/android-44-kasan-gce/kernel/kernel/signal.c:2315 [] do_signal+0x8b/0x1d40 /syzkaller/managers/android-44-kasan-gce/kernel/arch/x86/kernel/signal.c:712 [] exit_to_usermode_loop+0xf0/0x120 /syzkaller/managers/android-44-kasan-gce/kernel/arch/x86/entry/common.c:247 [] prepare_exit_to_usermode /syzkaller/managers/android-44-kasan-gce/kernel/arch/x86/entry/common.c:282 [inline] [] syscall_return_slowpath+0x186/0x1c0 /syzkaller/managers/android-44-kasan-gce/kernel/arch/x86/entry/common.c:347 [] int_ret_from_sys_call+0x25/0x9f 1 lock held by blkid/6644: #0: (&bdev->bd_mutex){+.+.+.}, at: [] blkdev_put+0x25/0x4c0 /syzkaller/managers/android-44-kasan-gce/kernel/fs/block_dev.c:1558 Sending NMI to all CPUs: NMI backtrace for cpu 0 CPU: 0 PID: 483 Comm: khungtaskd Not tainted 4.4.104-ged884eb #2 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8800bb955f00 task.stack: ffff8800bb138000 RIP: 0010:[] [] native_apic_mem_write /syzkaller/managers/android-44-kasan-gce/kernel/./arch/x86/include/asm/apic.h:94 [inline] RIP: 0010:[] [] __default_send_IPI_dest_field /syzkaller/managers/android-44-kasan-gce/kernel/./arch/x86/include/asm/ipi.h:119 [inline] RIP: 0010:[] [] _flat_send_IPI_mask /syzkaller/managers/android-44-kasan-gce/kernel/arch/x86/kernel/apic/apic_flat_64.c:61 [inline] RIP: 0010:[] [] flat_send_IPI_mask+0xf7/0x1a0 /syzkaller/managers/android-44-kasan-gce/kernel/arch/x86/kernel/apic/apic_flat_64.c:69 RSP: 0018:ffff8800bb13fcb8 EFLAGS: 00000046 RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000 RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300 RBP: ffff8800bb13fce0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000246 R13: 0000000000000003 R14: ffffffff8426ace0 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f956f1ae000 CR3: 00000000b7908000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffffff8426ace0 ffffffff847e7300 ffffffff847e48a4 0000000000000001 dffffc0000000000 ffff8800bb13fd00 ffffffff810b629b fffffbfff08fc914 0000000000019460 ffff8800bb13fd68 ffffffff81cd3e38 ffff8800bb13fd28 Call Trace: [] nmi_raise_cpu_backtrace+0x5b/0x70 /syzkaller/managers/android-44-kasan-gce/kernel/arch/x86/kernel/apic/hw_nmi.c:33 [] nmi_trigger_all_cpu_backtrace+0x428/0x590 /syzkaller/managers/android-44-kasan-gce/kernel/lib/nmi_backtrace.c:85 [] arch_trigger_all_cpu_backtrace+0x14/0x20 /syzkaller/managers/android-44-kasan-gce/kernel/arch/x86/kernel/apic/hw_nmi.c:38 [] trigger_all_cpu_backtrace /syzkaller/managers/android-44-kasan-gce/kernel/include/linux/nmi.h:44 [inline] [] check_hung_task /syzkaller/managers/android-44-kasan-gce/kernel/kernel/hung_task.c:125 [inline] [] check_hung_uninterruptible_tasks /syzkaller/managers/android-44-kasan-gce/kernel/kernel/hung_task.c:182 [inline] [] watchdog+0x636/0xa20 /syzkaller/managers/android-44-kasan-gce/kernel/kernel/hung_task.c:238 [] kthread+0x245/0x310 /syzkaller/managers/android-44-kasan-gce/kernel/kernel/kthread.c:211 [] ret_from_fork+0x3f/0x70 /syzkaller/managers/android-44-kasan-gce/kernel/arch/x86/entry/entry_64.S:468 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 9b 9d 16 00 4c 89 e7 57 9d 0f 1f NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.104-ged884eb #2 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801da655f00 task.stack: ffff8801da660000 RIP: 0010:[] [] native_safe_halt+0x6/0x10 /syzkaller/managers/android-44-kasan-gce/kernel/./arch/x86/include/asm/irqflags.h:49 RSP: 0018:ffff8801da667d78 EFLAGS: 00000246 RAX: 0000000000000007 RBX: ffffffff847d5408 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801da65676c RBP: ffff8801da667d78 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc4160eda0 CR3: 00000000b7908000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff8801da667db0 ffffffff81026f15 ffff8801da668000 ffffffff847d5408 0000000000000000 0000000000000000 dffffc0000000000 ffff8801da667dc0 ffffffff8102848a ffff8801da667dd8 ffffffff81214c18 ffff8801da668000 Call Trace: [] arch_safe_halt /syzkaller/managers/android-44-kasan-gce/kernel/./arch/x86/include/asm/paravirt.h:117 [inline] [] default_idle+0x55/0x3c0 /syzkaller/managers/android-44-kasan-gce/kernel/arch/x86/kernel/process.c:291 [] arch_cpu_idle+0xa/0x10 /syzkaller/managers/android-44-kasan-gce/kernel/arch/x86/kernel/process.c:282 [] default_idle_call+0x48/0x70 /syzkaller/managers/android-44-kasan-gce/kernel/kernel/sched/idle.c:93 [] cpuidle_idle_call /syzkaller/managers/android-44-kasan-gce/kernel/kernel/sched/idle.c:157 [inline] [] cpu_idle_loop /syzkaller/managers/android-44-kasan-gce/kernel/kernel/sched/idle.c:253 [inline] [] cpu_startup_entry+0x605/0x820 /syzkaller/managers/android-44-kasan-gce/kernel/kernel/sched/idle.c:301 [] start_secondary+0x304/0x3e0 /syzkaller/managers/android-44-kasan-gce/kernel/arch/x86/kernel/smpboot.c:251 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