INFO: task syz-executor.0:20134 blocked for more than 143 seconds. Not tainted 5.1.0-rc1+ #31 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28536 20134 7900 0x00000004 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 perf_trace_init+0x58/0x250 kernel/trace/trace_event_perf.c:218 perf_tp_event_init+0xa6/0x120 kernel/events/core.c:8591 perf_try_init_event+0x137/0x3f0 kernel/events/core.c:10011 perf_init_event kernel/events/core.c:10058 [inline] perf_event_alloc.part.0+0xfa0/0x3200 kernel/events/core.c:10328 perf_event_alloc kernel/events/core.c:10698 [inline] __do_sys_perf_event_open+0x830/0x24e0 kernel/events/core.c:10799 __se_sys_perf_event_open kernel/events/core.c:10688 [inline] __x64_sys_perf_event_open+0xbe/0x150 kernel/events/core.c:10688 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458079 Code: Bad RIP value. RSP: 002b:00007f2b9a2cec78 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000458079 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020940000 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f2b9a2cf6d4 R13: 00000000004c464c R14: 00000000004d7df0 R15: 00000000ffffffff INFO: task syz-executor.2:20147 blocked for more than 143 seconds. Not tainted 5.1.0-rc1+ #31 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D30136 20147 7905 0x00000004 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 perf_trace_init+0x58/0x250 kernel/trace/trace_event_perf.c:218 perf_tp_event_init+0xa6/0x120 kernel/events/core.c:8591 perf_try_init_event+0x137/0x3f0 kernel/events/core.c:10011 perf_init_event kernel/events/core.c:10058 [inline] perf_event_alloc.part.0+0xfa0/0x3200 kernel/events/core.c:10328 perf_event_alloc kernel/events/core.c:10698 [inline] __do_sys_perf_event_open+0x830/0x24e0 kernel/events/core.c:10799 __se_sys_perf_event_open kernel/events/core.c:10688 [inline] __x64_sys_perf_event_open+0xbe/0x150 kernel/events/core.c:10688 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458079 Code: Bad RIP value. RSP: 002b:00007f3ee620bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000458079 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000140 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f3ee620c6d4 R13: 00000000004c464c R14: 00000000004d7df0 R15: 00000000ffffffff INFO: task syz-executor.4:20185 blocked for more than 143 seconds. Not tainted 5.1.0-rc1+ #31 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28648 20185 20179 0x00000004 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 perf_trace_init+0x58/0x250 kernel/trace/trace_event_perf.c:218 perf_tp_event_init+0xa6/0x120 kernel/events/core.c:8591 perf_try_init_event+0x137/0x3f0 kernel/events/core.c:10011 perf_init_event kernel/events/core.c:10058 [inline] perf_event_alloc.part.0+0xfa0/0x3200 kernel/events/core.c:10328 perf_event_alloc kernel/events/core.c:10698 [inline] __do_sys_perf_event_open+0x830/0x24e0 kernel/events/core.c:10799 __se_sys_perf_event_open kernel/events/core.c:10688 [inline] __x64_sys_perf_event_open+0xbe/0x150 kernel/events/core.c:10688 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458079 Code: Bad RIP value. RSP: 002b:00007f5f47ff9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000458079 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020940000 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f5f47ffa6d4 R13: 00000000004c464c R14: 00000000004d7df0 R15: 00000000ffffffff Showing all locks held in the system: 2 locks held by kworker/u4:0/7: #0: 0000000010e68d15 (&rq->lock){-.-.}, at: idle_balance kernel/sched/fair.c:10011 [inline] #0: 0000000010e68d15 (&rq->lock){-.-.}, at: pick_next_task_fair+0x1214/0x19a0 kernel/sched/fair.c:7062 #1: 000000004ba8a849 (rcu_read_lock){....}, at: __update_idle_core+0x45/0x3f0 kernel/sched/fair.c:6059 1 lock held by khungtaskd/1042: #0: 000000004ba8a849 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5061 1 lock held by rsyslogd/7750: #0: 00000000865425ee (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/7863: #0: 000000004cb72e79 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000da9d3f06 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7864: #0: 000000000facf104 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000b52bcbb6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7865: #0: 00000000e71ca008 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000663d4e17 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7866: #0: 000000003ed423af (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000008b4550da (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7867: #0: 0000000069d18dad (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000b7ae3f02 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7868: #0: 000000009cb9d75e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000044810900 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7869: #0: 000000004f9e3f13 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000fd93e6ce (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.4/20066: 3 locks held by syz-executor.0/20134: #0: 000000002b341275 (&sig->cred_guard_mutex){+.+.}, at: __do_sys_perf_event_open+0x6d2/0x24e0 kernel/events/core.c:10779 #1: 00000000be445aa0 (&pmus_srcu){....}, at: perf_event_alloc.part.0+0xd57/0x3200 kernel/events/core.c:10324 #2: 00000000867b2109 (event_mutex){+.+.}, at: perf_trace_init+0x58/0x250 kernel/trace/trace_event_perf.c:218 3 locks held by syz-executor.2/20147: #0: 0000000057fdcbeb (&sig->cred_guard_mutex){+.+.}, at: __do_sys_perf_event_open+0x6d2/0x24e0 kernel/events/core.c:10779 #1: 00000000be445aa0 (&pmus_srcu){....}, at: perf_event_alloc.part.0+0xd57/0x3200 kernel/events/core.c:10324 #2: 00000000867b2109 (event_mutex){+.+.}, at: perf_trace_init+0x58/0x250 kernel/trace/trace_event_perf.c:218 3 locks held by syz-executor.4/20185: #0: 000000000f49bb64 (&sig->cred_guard_mutex){+.+.}, at: __do_sys_perf_event_open+0x6d2/0x24e0 kernel/events/core.c:10779 #1: 00000000be445aa0 (&pmus_srcu){....}, at: perf_event_alloc.part.0+0xd57/0x3200 kernel/events/core.c:10324 #2: 00000000867b2109 (event_mutex){+.+.}, at: perf_trace_init+0x58/0x250 kernel/trace/trace_event_perf.c:218 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc1+ #31 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:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: