INFO: task syz-executor.2:8671 blocked for more than 143 seconds. Not tainted 5.3.0-rc3+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D27760 8671 8648 0x00004004 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x713/0x1520 kernel/sched/core.c:3880 schedule+0x8f/0x260 kernel/sched/core.c:3944 schedule_timeout+0x5c4/0xad0 kernel/time/timer.c:1783 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x28b/0x460 kernel/sched/completion.c:136 flush_workqueue+0x35d/0x13c0 kernel/workqueue.c:2826 nbd_start_device_ioctl drivers/block/nbd.c:1254 [inline] __nbd_ioctl drivers/block/nbd.c:1329 [inline] nbd_ioctl+0x975/0xb40 drivers/block/nbd.c:1369 __blkdev_driver_ioctl block/ioctl.c:304 [inline] blkdev_ioctl+0x9aa/0x1840 block/ioctl.c:606 block_ioctl+0xd7/0x130 fs/block_dev.c:1994 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x196/0x1150 fs/ioctl.c:696 ksys_ioctl+0x62/0x90 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:718 do_syscall_64+0xd0/0x540 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459a29 Code: fa ff 48 8b 44 24 10 48 8b 4c 24 30 48 8d 91 d0 10 00 00 48 89 14 24 48 89 44 24 08 48 c7 44 24 10 02 00 00 00 e8 57 d8 fa ff <48> 8b 44 24 18 48 8b 4c 24 30 48 81 c1 d8 10 00 00 48 89 0c 24 48 RSP: 002b:00007fcbcad83c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459a29 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcbcad846d4 R13: 00000000004c333c R14: 00000000004d6c60 R15: 00000000ffffffff INFO: task syz-executor.0:8682 blocked for more than 143 seconds. Not tainted 5.3.0-rc3+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D27760 8682 8652 0x00004004 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x713/0x1520 kernel/sched/core.c:3880 schedule+0x8f/0x260 kernel/sched/core.c:3944 schedule_timeout+0x5c4/0xad0 kernel/time/timer.c:1783 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x28b/0x460 kernel/sched/completion.c:136 flush_workqueue+0x35d/0x13c0 kernel/workqueue.c:2826 nbd_start_device_ioctl drivers/block/nbd.c:1254 [inline] __nbd_ioctl drivers/block/nbd.c:1329 [inline] nbd_ioctl+0x975/0xb40 drivers/block/nbd.c:1369 __blkdev_driver_ioctl block/ioctl.c:304 [inline] blkdev_ioctl+0x9aa/0x1840 block/ioctl.c:606 block_ioctl+0xd7/0x130 fs/block_dev.c:1994 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x196/0x1150 fs/ioctl.c:696 ksys_ioctl+0x62/0x90 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:718 do_syscall_64+0xd0/0x540 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459a29 Code: fa ff 48 8b 44 24 10 48 8b 4c 24 30 48 8d 91 d0 10 00 00 48 89 14 24 48 89 44 24 08 48 c7 44 24 10 02 00 00 00 e8 57 d8 fa ff <48> 8b 44 24 18 48 8b 4c 24 30 48 81 c1 d8 10 00 00 48 89 0c 24 48 RSP: 002b:00007f4a37daac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459a29 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4a37dab6d4 R13: 00000000004c333c R14: 00000000004d6c60 R15: 00000000ffffffff INFO: task syz-executor.3:8689 blocked for more than 144 seconds. Not tainted 5.3.0-rc3+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D27760 8689 8654 0x00004004 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x713/0x1520 kernel/sched/core.c:3880 schedule+0x8f/0x260 kernel/sched/core.c:3944 schedule_timeout+0x5c4/0xad0 kernel/time/timer.c:1783 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x28b/0x460 kernel/sched/completion.c:136 flush_workqueue+0x35d/0x13c0 kernel/workqueue.c:2826 nbd_start_device_ioctl drivers/block/nbd.c:1254 [inline] __nbd_ioctl drivers/block/nbd.c:1329 [inline] nbd_ioctl+0x975/0xb40 drivers/block/nbd.c:1369 __blkdev_driver_ioctl block/ioctl.c:304 [inline] blkdev_ioctl+0x9aa/0x1840 block/ioctl.c:606 block_ioctl+0xd7/0x130 fs/block_dev.c:1994 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x196/0x1150 fs/ioctl.c:696 ksys_ioctl+0x62/0x90 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:718 do_syscall_64+0xd0/0x540 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459a29 Code: fa ff 48 8b 44 24 10 48 8b 4c 24 30 48 8d 91 d0 10 00 00 48 89 14 24 48 89 44 24 08 48 c7 44 24 10 02 00 00 00 e8 57 d8 fa ff <48> 8b 44 24 18 48 8b 4c 24 30 48 81 c1 d8 10 00 00 48 89 0c 24 48 RSP: 002b:00007f1da422ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459a29 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1da422b6d4 R13: 00000000004c333c R14: 00000000004d6c60 R15: 00000000ffffffff INFO: task syz-executor.4:8700 blocked for more than 144 seconds. Not tainted 5.3.0-rc3+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D27760 8700 8651 0x00004004 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x713/0x1520 kernel/sched/core.c:3880 schedule+0x8f/0x260 kernel/sched/core.c:3944 schedule_timeout+0x5c4/0xad0 kernel/time/timer.c:1783 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x28b/0x460 kernel/sched/completion.c:136 flush_workqueue+0x35d/0x13c0 kernel/workqueue.c:2826 nbd_start_device_ioctl drivers/block/nbd.c:1254 [inline] __nbd_ioctl drivers/block/nbd.c:1329 [inline] nbd_ioctl+0x975/0xb40 drivers/block/nbd.c:1369 __blkdev_driver_ioctl block/ioctl.c:304 [inline] blkdev_ioctl+0x9aa/0x1840 block/ioctl.c:606 block_ioctl+0xd7/0x130 fs/block_dev.c:1994 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x196/0x1150 fs/ioctl.c:696 ksys_ioctl+0x62/0x90 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:718 do_syscall_64+0xd0/0x540 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459a29 Code: fa ff 48 8b 44 24 10 48 8b 4c 24 30 48 8d 91 d0 10 00 00 48 89 14 24 48 89 44 24 08 48 c7 44 24 10 02 00 00 00 e8 57 d8 fa ff <48> 8b 44 24 18 48 8b 4c 24 30 48 81 c1 d8 10 00 00 48 89 0c 24 48 RSP: 002b:00007fe7de916c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459a29 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe7de9176d4 R13: 00000000004c333c R14: 00000000004d6c60 R15: 00000000ffffffff INFO: task syz-executor.5:8714 blocked for more than 144 seconds. Not tainted 5.3.0-rc3+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D27760 8714 8655 0x00004004 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x713/0x1520 kernel/sched/core.c:3880 schedule+0x8f/0x260 kernel/sched/core.c:3944 schedule_timeout+0x5c4/0xad0 kernel/time/timer.c:1783 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x28b/0x460 kernel/sched/completion.c:136 flush_workqueue+0x35d/0x13c0 kernel/workqueue.c:2826 nbd_start_device_ioctl drivers/block/nbd.c:1254 [inline] __nbd_ioctl drivers/block/nbd.c:1329 [inline] nbd_ioctl+0x975/0xb40 drivers/block/nbd.c:1369 __blkdev_driver_ioctl block/ioctl.c:304 [inline] blkdev_ioctl+0x9aa/0x1840 block/ioctl.c:606 block_ioctl+0xd7/0x130 fs/block_dev.c:1994 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x196/0x1150 fs/ioctl.c:696 ksys_ioctl+0x62/0x90 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:718 do_syscall_64+0xd0/0x540 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459a29 Code: fa ff 48 8b 44 24 10 48 8b 4c 24 30 48 8d 91 d0 10 00 00 48 89 14 24 48 89 44 24 08 48 c7 44 24 10 02 00 00 00 e8 57 d8 fa ff <48> 8b 44 24 18 48 8b 4c 24 30 48 81 c1 d8 10 00 00 48 89 0c 24 48 RSP: 002b:00007f1a7f3bdc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459a29 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1a7f3be6d4 R13: 00000000004c333c R14: 00000000004d6c60 R15: 00000000ffffffff INFO: task syz-executor.1:8717 blocked for more than 145 seconds. Not tainted 5.3.0-rc3+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D27760 8717 8646 0x00004004 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x713/0x1520 kernel/sched/core.c:3880 schedule+0x8f/0x260 kernel/sched/core.c:3944 schedule_timeout+0x5c4/0xad0 kernel/time/timer.c:1783 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x28b/0x460 kernel/sched/completion.c:136 flush_workqueue+0x35d/0x13c0 kernel/workqueue.c:2826 nbd_start_device_ioctl drivers/block/nbd.c:1254 [inline] __nbd_ioctl drivers/block/nbd.c:1329 [inline] nbd_ioctl+0x975/0xb40 drivers/block/nbd.c:1369 __blkdev_driver_ioctl block/ioctl.c:304 [inline] blkdev_ioctl+0x9aa/0x1840 block/ioctl.c:606 block_ioctl+0xd7/0x130 fs/block_dev.c:1994 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x196/0x1150 fs/ioctl.c:696 ksys_ioctl+0x62/0x90 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:718 do_syscall_64+0xd0/0x540 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459a29 Code: fa ff 48 8b 44 24 10 48 8b 4c 24 30 48 8d 91 d0 10 00 00 48 89 14 24 48 89 44 24 08 48 c7 44 24 10 02 00 00 00 e8 57 d8 fa ff <48> 8b 44 24 18 48 8b 4c 24 30 48 81 c1 d8 10 00 00 48 89 0c 24 48 RSP: 002b:00007f1c75883c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459a29 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1c758846d4 R13: 00000000004c333c R14: 00000000004d6c60 R15: 00000000ffffffff INFO: lockdep is turned off. NMI backtrace for cpu 1 CPU: 1 PID: 1056 Comm: khungtaskd Not tainted 5.3.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x113/0x167 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.7+0x4b/0x84 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x18b/0x1b7 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0x592/0xb60 kernel/hung_task.c:289 kthread+0x331/0x3f0 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x12/0x20 arch/x86/include/asm/irqflags.h:60