INFO: task syz-executor.4:18890 blocked for more than 143 seconds. Not tainted 5.1.0-rc2 #36 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D30136 18890 8274 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:8593 perf_try_init_event+0x137/0x3f0 kernel/events/core.c:10013 perf_init_event kernel/events/core.c:10060 [inline] perf_event_alloc.part.0+0xfa0/0x3200 kernel/events/core.c:10330 perf_event_alloc kernel/events/core.c:10700 [inline] __do_sys_perf_event_open+0x830/0x24e0 kernel/events/core.c:10801 __se_sys_perf_event_open kernel/events/core.c:10690 [inline] __x64_sys_perf_event_open+0xbe/0x150 kernel/events/core.c:10690 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458209 Code: Bad RIP value. RSP: 002b:00007fb2419efc78 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000458209 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000000020000140 RBP: 000000000073c040 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 00007fb2419f06d4 R13: 00000000004c47ec R14: 00000000004d7f90 R15: 00000000ffffffff INFO: task syz-executor.1:18888 blocked for more than 143 seconds. Not tainted 5.1.0-rc2 #36 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D30032 18888 8266 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:8593 perf_try_init_event+0x137/0x3f0 kernel/events/core.c:10013 perf_init_event kernel/events/core.c:10060 [inline] perf_event_alloc.part.0+0xfa0/0x3200 kernel/events/core.c:10330 perf_event_alloc kernel/events/core.c:10700 [inline] __do_sys_perf_event_open+0x830/0x24e0 kernel/events/core.c:10801 __se_sys_perf_event_open kernel/events/core.c:10690 [inline] __x64_sys_perf_event_open+0xbe/0x150 kernel/events/core.c:10690 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458209 Code: Bad RIP value. RSP: 002b:00007f8998b96c78 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000458209 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000000020000140 RBP: 000000000073c040 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f8998b976d4 R13: 00000000004c47ec R14: 00000000004d7f90 R15: 00000000ffffffff INFO: task syz-executor.3:18928 blocked for more than 143 seconds. Not tainted 5.1.0-rc2 #36 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D27840 18928 18921 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:8593 perf_try_init_event+0x137/0x3f0 kernel/events/core.c:10013 perf_init_event kernel/events/core.c:10060 [inline] perf_event_alloc.part.0+0xfa0/0x3200 kernel/events/core.c:10330 perf_event_alloc kernel/events/core.c:10700 [inline] __do_sys_perf_event_open+0x830/0x24e0 kernel/events/core.c:10801 __se_sys_perf_event_open kernel/events/core.c:10690 [inline] __x64_sys_perf_event_open+0xbe/0x150 kernel/events/core.c:10690 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458209 Code: Bad RIP value. RSP: 002b:00007fcbcd2a3c78 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000458209 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000000020000140 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 00007fcbcd2a46d4 R13: 00000000004c47ec R14: 00000000004d7f90 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1042: #0: 00000000275a8b80 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5061 2 locks held by rsyslogd/8104: 2 locks held by getty/8225: #0: 00000000f07abe38 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000d52849e4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8226: #0: 00000000e630c974 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000b2f975ec (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8227: #0: 000000005766b4b7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000002e2569ad (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8228: #0: 0000000048930415 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000008f18db46 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8229: #0: 00000000f6a14925 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000c58f643d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8230: #0: 00000000d1dac1f4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000aaaf6a7b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8231: #0: 000000002e9d145a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000d2b855b8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.3/18849: 3 locks held by syz-executor.4/18890: #0: 00000000f67f037a (&sig->cred_guard_mutex){+.+.}, at: __do_sys_perf_event_open+0x6d2/0x24e0 kernel/events/core.c:10781 #1: 00000000cf93ecb5 (&pmus_srcu){....}, at: perf_event_alloc.part.0+0xd57/0x3200 kernel/events/core.c:10326 #2: 000000004b44f912 (event_mutex){+.+.}, at: perf_trace_init+0x58/0x250 kernel/trace/trace_event_perf.c:218 3 locks held by syz-executor.1/18888: #0: 00000000a109d84c (&sig->cred_guard_mutex){+.+.}, at: __do_sys_perf_event_open+0x6d2/0x24e0 kernel/events/core.c:10781 #1: 00000000cf93ecb5 (&pmus_srcu){....}, at: perf_event_alloc.part.0+0xd57/0x3200 kernel/events/core.c:10326 #2: 000000004b44f912 (event_mutex){+.+.}, at: perf_trace_init+0x58/0x250 kernel/trace/trace_event_perf.c:218 3 locks held by syz-executor.3/18928: #0: 000000001fd7e065 (&sig->cred_guard_mutex){+.+.}, at: __do_sys_perf_event_open+0x6d2/0x24e0 kernel/events/core.c:10781 #1: 00000000cf93ecb5 (&pmus_srcu){....}, at: perf_event_alloc.part.0+0xd57/0x3200 kernel/events/core.c:10326 #2: 000000004b44f912 (event_mutex){+.+.}, at: perf_trace_init+0x58/0x250 kernel/trace/trace_event_perf.c:218 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc2 #36 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 1 to CPUs 0: