INFO: task syz-executor.5:10931 blocked for more than 143 seconds. Not tainted 5.1.0-rc4-next-20190411 #23 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28472 10931 9072 0x80000006 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3518 schedule+0x92/0x180 kernel/sched/core.c:3562 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3620 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1310 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 odev_release+0x4c/0x80 sound/core/seq/oss/seq_oss.c:152 __fput+0x2e5/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x90a/0x2fa0 kernel/exit.c:876 do_group_exit+0x135/0x370 kernel/exit.c:980 get_signal+0x399/0x1d50 kernel/signal.c:2578 do_signal+0x87/0x1940 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 00cf:0xfbb9b7fb21a0d63d Code: Bad RIP value. RSP: 002b:0000000000000000 EFLAGS: 00000202 ORIG_RAX: 4a39679375ff8206 RAX: 4899b10292a184e2 RBX: e17acbc97e09a1d5 RCX: d9a38b0f58477ed2 RDX: e30bed02409c4b7f RSI: 21e621db062777a4 RDI: 3018cb6360e7268c RBP: c9f430f5a432eb95 R08: 9772c75a4d848924 R09: de8dc8130a8d00e4 R10: c584612d789079f5 R11: dcb6157f75e34067 R12: c095a216647cc6de R13: 577ea107cd50fa56 R14: 35f8de53a18627c3 R15: 5909a4034a71bf37 INFO: task syz-executor.5:10974 blocked for more than 143 seconds. Not tainted 5.1.0-rc4-next-20190411 #23 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28408 10974 9072 0x80000006 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3518 schedule+0x92/0x180 kernel/sched/core.c:3562 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3620 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1310 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 odev_release+0x4c/0x80 sound/core/seq/oss/seq_oss.c:152 __fput+0x2e5/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x90a/0x2fa0 kernel/exit.c:876 do_group_exit+0x135/0x370 kernel/exit.c:980 get_signal+0x399/0x1d50 kernel/signal.c:2578 do_signal+0x87/0x1940 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 00cf:0xfbb9b7fb21a0d63d Code: Bad RIP value. RSP: 002b:0000000000000000 EFLAGS: 00000202 ORIG_RAX: 4a39679375ff8206 RAX: 4899b10292a184e2 RBX: e17acbc97e09a1d5 RCX: d9a38b0f58477ed2 RDX: e30bed02409c4b7f RSI: 21e621db062777a4 RDI: 3018cb6360e7268c RBP: c9f430f5a432eb95 R08: 9772c75a4d848924 R09: de8dc8130a8d00e4 R10: c584612d789079f5 R11: dcb6157f75e34067 R12: c095a216647cc6de R13: 577ea107cd50fa56 R14: 35f8de53a18627c3 R15: 5909a4034a71bf37 INFO: task syz-executor.5:11018 blocked for more than 143 seconds. Not tainted 5.1.0-rc4-next-20190411 #23 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28408 11018 9072 0x80000006 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3518 schedule+0x92/0x180 kernel/sched/core.c:3562 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3620 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1310 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 odev_release+0x4c/0x80 sound/core/seq/oss/seq_oss.c:152 __fput+0x2e5/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x90a/0x2fa0 kernel/exit.c:876 do_group_exit+0x135/0x370 kernel/exit.c:980 get_signal+0x399/0x1d50 kernel/signal.c:2578 do_signal+0x87/0x1940 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 00cf:0xfbb9b7fb21a0d63d Code: Bad RIP value. RSP: 002b:0000000000000000 EFLAGS: 00000202 ORIG_RAX: 4a39679375ff8206 RAX: 4899b10292a184e2 RBX: e17acbc97e09a1d5 RCX: d9a38b0f58477ed2 RDX: e30bed02409c4b7f RSI: 21e621db062777a4 RDI: 3018cb6360e7268c RBP: c9f430f5a432eb95 R08: 9772c75a4d848924 R09: de8dc8130a8d00e4 R10: c584612d789079f5 R11: dcb6157f75e34067 R12: c095a216647cc6de R13: 577ea107cd50fa56 R14: 35f8de53a18627c3 R15: 5909a4034a71bf37 INFO: task syz-executor.5:11064 blocked for more than 144 seconds. Not tainted 5.1.0-rc4-next-20190411 #23 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28408 11064 9072 0x80000006 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3518 schedule+0x92/0x180 kernel/sched/core.c:3562 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3620 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1310 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 odev_release+0x4c/0x80 sound/core/seq/oss/seq_oss.c:152 __fput+0x2e5/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x90a/0x2fa0 kernel/exit.c:876 do_group_exit+0x135/0x370 kernel/exit.c:980 get_signal+0x399/0x1d50 kernel/signal.c:2578 do_signal+0x87/0x1940 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 00cf:0xfbb9b7fb21a0d63d Code: Bad RIP value. RSP: 002b:0000000000000000 EFLAGS: 00000202 ORIG_RAX: 4a39679375ff8206 RAX: 4899b10292a184e2 RBX: e17acbc97e09a1d5 RCX: d9a38b0f58477ed2 RDX: e30bed02409c4b7f RSI: 21e621db062777a4 RDI: 3018cb6360e7268c RBP: c9f430f5a432eb95 R08: 9772c75a4d848924 R09: de8dc8130a8d00e4 R10: c584612d789079f5 R11: dcb6157f75e34067 R12: c095a216647cc6de R13: 577ea107cd50fa56 R14: 35f8de53a18627c3 R15: 5909a4034a71bf37 INFO: task syz-executor.5:11103 blocked for more than 144 seconds. Not tainted 5.1.0-rc4-next-20190411 #23 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28472 11103 9072 0x80000006 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3518 schedule+0x92/0x180 kernel/sched/core.c:3562 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3620 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1310 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 odev_release+0x4c/0x80 sound/core/seq/oss/seq_oss.c:152 __fput+0x2e5/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x90a/0x2fa0 kernel/exit.c:876 do_group_exit+0x135/0x370 kernel/exit.c:980 get_signal+0x399/0x1d50 kernel/signal.c:2578 do_signal+0x87/0x1940 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 00cf:0xfbb9b7fb21a0d63d Code: Bad RIP value. RSP: 002b:0000000000000000 EFLAGS: 00000202 ORIG_RAX: 4a39679375ff8206 RAX: 4899b10292a184e2 RBX: e17acbc97e09a1d5 RCX: d9a38b0f58477ed2 RDX: e30bed02409c4b7f RSI: 21e621db062777a4 RDI: 3018cb6360e7268c RBP: c9f430f5a432eb95 R08: 9772c75a4d848924 R09: de8dc8130a8d00e4 R10: c584612d789079f5 R11: dcb6157f75e34067 R12: c095a216647cc6de R13: 577ea107cd50fa56 R14: 35f8de53a18627c3 R15: 5909a4034a71bf37 INFO: task syz-executor.5:11144 blocked for more than 144 seconds. Not tainted 5.1.0-rc4-next-20190411 #23 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28472 11144 9072 0x80000006 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3518 schedule+0x92/0x180 kernel/sched/core.c:3562 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3620 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1310 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 snd_seq_kernel_client_ctl+0xe5/0x170 sound/core/seq/seq_clientmgr.c:2345 snd_seq_oss_control sound/core/seq/oss/seq_oss_device.h:157 [inline] snd_seq_oss_writeq_clear+0xe0/0x140 sound/core/seq/oss/seq_oss_writeq.c:85 snd_seq_oss_writeq_delete+0x20/0x40 sound/core/seq/oss/seq_oss_writeq.c:69 free_devinfo+0x66/0xc0 sound/core/seq/oss/seq_oss_init.c:406 port_delete+0xe8/0x1c0 sound/core/seq/seq_ports.c:272 snd_seq_delete_port+0x266/0x330 sound/core/seq/seq_ports.c:301 snd_seq_ioctl_delete_port+0xba/0x190 sound/core/seq/seq_clientmgr.c:1321 snd_seq_kernel_client_ctl+0x112/0x170 sound/core/seq/seq_clientmgr.c:2346 snd_seq_event_port_detach+0xba/0x100 sound/core/seq/seq_ports.c:705 delete_port+0x87/0xd0 sound/core/seq/oss/seq_oss_init.c:354 snd_seq_oss_release+0xf5/0x150 sound/core/seq/oss/seq_oss_init.c:433 odev_release+0x54/0x80 sound/core/seq/oss/seq_oss.c:153 __fput+0x2e5/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x90a/0x2fa0 kernel/exit.c:876 do_group_exit+0x135/0x370 kernel/exit.c:980 get_signal+0x399/0x1d50 kernel/signal.c:2578 do_signal+0x87/0x1940 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 00cf:0xfbb9b7fb21a0d63d Code: Bad RIP value. RSP: 002b:0000000000000000 EFLAGS: 00000202 ORIG_RAX: 4a39679375ff8206 RAX: 4899b10292a184e2 RBX: e17acbc97e09a1d5 RCX: d9a38b0f58477ed2 RDX: e30bed02409c4b7f RSI: 21e621db062777a4 RDI: 3018cb6360e7268c RBP: c9f430f5a432eb95 R08: 9772c75a4d848924 R09: de8dc8130a8d00e4 R10: c584612d789079f5 R11: dcb6157f75e34067 R12: c095a216647cc6de R13: 577ea107cd50fa56 R14: 35f8de53a18627c3 R15: 5909a4034a71bf37 INFO: task syz-executor.5:11185 blocked for more than 145 seconds. Not tainted 5.1.0-rc4-next-20190411 #23 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28472 11185 9072 0x80000006 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3518 schedule+0x92/0x180 kernel/sched/core.c:3562 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3620 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1310 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 odev_release+0x4c/0x80 sound/core/seq/oss/seq_oss.c:152 __fput+0x2e5/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x90a/0x2fa0 kernel/exit.c:876 do_group_exit+0x135/0x370 kernel/exit.c:980 get_signal+0x399/0x1d50 kernel/signal.c:2578 do_signal+0x87/0x1940 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 00cf:0xfbb9b7fb21a0d63d Code: Bad RIP value. RSP: 002b:0000000000000000 EFLAGS: 00000202 ORIG_RAX: 4a39679375ff8206 RAX: 4899b10292a184e2 RBX: e17acbc97e09a1d5 RCX: d9a38b0f58477ed2 RDX: e30bed02409c4b7f RSI: 21e621db062777a4 RDI: 3018cb6360e7268c RBP: c9f430f5a432eb95 R08: 9772c75a4d848924 R09: de8dc8130a8d00e4 R10: c584612d789079f5 R11: dcb6157f75e34067 R12: c095a216647cc6de R13: 577ea107cd50fa56 R14: 35f8de53a18627c3 R15: 5909a4034a71bf37 INFO: task syz-executor.5:11223 blocked for more than 145 seconds. Not tainted 5.1.0-rc4-next-20190411 #23 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28472 11223 9072 0x80000006 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3518 schedule+0x92/0x180 kernel/sched/core.c:3562 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3620 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1310 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 odev_release+0x4c/0x80 sound/core/seq/oss/seq_oss.c:152 __fput+0x2e5/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x90a/0x2fa0 kernel/exit.c:876 do_group_exit+0x135/0x370 kernel/exit.c:980 get_signal+0x399/0x1d50 kernel/signal.c:2578 do_signal+0x87/0x1940 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 00cf:0xfbb9b7fb21a0d63d Code: Bad RIP value. RSP: 002b:0000000000000000 EFLAGS: 00000202 ORIG_RAX: 4a39679375ff8206 RAX: 4899b10292a184e2 RBX: e17acbc97e09a1d5 RCX: d9a38b0f58477ed2 RDX: e30bed02409c4b7f RSI: 21e621db062777a4 RDI: 3018cb6360e7268c RBP: c9f430f5a432eb95 R08: 9772c75a4d848924 R09: de8dc8130a8d00e4 R10: c584612d789079f5 R11: dcb6157f75e34067 R12: c095a216647cc6de R13: 577ea107cd50fa56 R14: 35f8de53a18627c3 R15: 5909a4034a71bf37 INFO: lockdep is turned off. NMI backtrace for cpu 1 CPU: 1 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc4-next-20190411 #23 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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 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:204 [inline] watchdog+0x9b7/0xec0 kernel/hung_task.c:288 kthread+0x357/0x430 kernel/kthread.c:254 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: