INFO: task syz-executor.4:17716 can't die for more than 143 seconds. syz-executor.4 D26656 17716 9628 0x00004004 Call Trace: context_switch kernel/sched/core.c:3380 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4080 schedule+0xdc/0x2b0 kernel/sched/core.c:4154 perf_event_free_task+0x54e/0x720 kernel/events/core.c:12018 copy_process+0x47e4/0x70f0 kernel/fork.c:2346 _do_fork+0x146/0x1090 kernel/fork.c:2434 __do_sys_clone+0x113/0x170 kernel/fork.c:2589 __se_sys_clone kernel/fork.c:2570 [inline] __x64_sys_clone+0xbe/0x150 kernel/fork.c:2570 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c479 Code: Bad RIP value. RSP: 002b:00007f90cce1dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f90cce1e6d4 RCX: 000000000045c479 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 00000000000001fe RBP: 000000000076bf20 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000020000280 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000074 R14: 00000000004c2d06 R15: 000000000076bf2c INFO: task syz-executor.4:17716 blocked for more than 143 seconds. Not tainted 5.6.0-rc3-next-20200225-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D26656 17716 9628 0x00004004 Call Trace: context_switch kernel/sched/core.c:3380 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4080 schedule+0xdc/0x2b0 kernel/sched/core.c:4154 perf_event_free_task+0x54e/0x720 kernel/events/core.c:12018 copy_process+0x47e4/0x70f0 kernel/fork.c:2346 _do_fork+0x146/0x1090 kernel/fork.c:2434 __do_sys_clone+0x113/0x170 kernel/fork.c:2589 __se_sys_clone kernel/fork.c:2570 [inline] __x64_sys_clone+0xbe/0x150 kernel/fork.c:2570 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c479 Code: Bad RIP value. RSP: 002b:00007f90cce1dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f90cce1e6d4 RCX: 000000000045c479 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 00000000000001fe RBP: 000000000076bf20 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000020000280 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000074 R14: 00000000004c2d06 R15: 000000000076bf2c Showing all locks held in the system: 1 lock held by khungtaskd/1131: #0: ffffffff89badac0 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5546 1 lock held by rsyslogd/9477: #0: ffff888099e070e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:821 2 locks held by getty/9567: #0: ffff888099832090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc900017bb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9568: #0: ffff88809e626090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000181b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9569: #0: ffff88808f447090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000183b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9570: #0: ffff88808d474090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000180b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9571: #0: ffff888093017090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc900017cb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9572: #0: ffff8880a0311090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000182b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9573: #0: ffff8880a6906090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000177b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 3 locks held by kworker/u4:11/10713: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1131 Comm: khungtaskd Not tainted 5.6.0-rc3-next-20200225-syzkaller #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+0x197/0x210 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:249 [inline] watchdog+0xdf1/0x14e0 kernel/hung_task.c:333 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 10702 Comm: kworker/u4:9 Not tainted 5.6.0-rc3-next-20200225-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_purge_orig RIP: 0010:mark_held_locks+0x5d/0xf0 kernel/locking/lockdep.c:3584 Code: 84 c0 74 08 3c 03 0f 8e 89 00 00 00 41 8b 85 98 08 00 00 31 db 49 be 00 00 00 00 00 fc ff df 4d 8d bd a0 08 00 00 85 c0 7e 57 <48> 63 c3 48 8d 04 80 49 8d 34 c7 48 8d 7e 22 48 89 f8 48 89 fa 48 RSP: 0018:ffffc90005157b20 EFLAGS: 00000002 RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000006 RDX: 1ffffffff16acd92 RSI: 0000000000000008 RDI: ffffffff8b566c90 RBP: ffffc90005157b50 R08: 1ffffffff16a4d0f R09: fffffbfff16a4d10 R10: fffffbfff16a4d0f R11: ffffffff8b52687f R12: 0000000000000006 R13: ffff88804279e3c0 R14: dffffc0000000000 R15: ffff88804279ec60 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000045c44f CR3: 0000000096be7000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __trace_hardirqs_on_caller kernel/locking/lockdep.c:3623 [inline] lockdep_hardirqs_on+0x421/0x5e0 kernel/locking/lockdep.c:3668 trace_hardirqs_on+0x67/0x240 kernel/trace/trace_preemptirq.c:31 __local_bh_enable_ip+0x15a/0x270 kernel/softirq.c:194 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline] _raw_spin_unlock_bh+0x2c/0x30 kernel/locking/spinlock.c:207 spin_unlock_bh include/linux/spinlock.h:383 [inline] batadv_purge_orig_ref+0xc95/0x1370 net/batman-adv/originator.c:1366 batadv_purge_orig+0x1b/0x70 net/batman-adv/originator.c:1379 process_one_work+0xa05/0x17a0 kernel/workqueue.c:2266 worker_thread+0x98/0xe40 kernel/workqueue.c:2412 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352