INFO: task syz-executor1:10334 blocked for more than 140 seconds. bridge: RTM_NEWNEIGH bridge0 with NTF_USE is not supported Not tainted 4.20.0-rc6+ #373 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. bridge: RTM_NEWNEIGH bridge0 with NTF_USE is not supported syz-executor1 D25208 10334 6083 0x00000000 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472 schedule+0xfe/0x460 kernel/sched/core.c:3516 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xaff/0x16f0 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 pipe_lock_nested fs/pipe.c:62 [inline] pipe_lock+0x6e/0x80 fs/pipe.c:70 do_splice+0xe79/0x1430 fs/splice.c:1175 __do_sys_splice fs/splice.c:1419 [inline] __se_sys_splice fs/splice.c:1399 [inline] __x64_sys_splice+0x2c1/0x330 fs/splice.c:1399 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457659 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f880a056c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000457659 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 000000000072bf00 R08: 000000000000ced1 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f880a0576d4 R13: 00000000004c5aac R14: 00000000004d9740 R15: 00000000ffffffff INFO: task syz-executor1:10355 blocked for more than 140 seconds. Not tainted 4.20.0-rc6+ #373 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D25208 10355 6083 0x00000000 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472 schedule+0xfe/0x460 kernel/sched/core.c:3516 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xaff/0x16f0 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 pipe_lock_nested fs/pipe.c:62 [inline] pipe_lock+0x6e/0x80 fs/pipe.c:70 do_splice+0xe79/0x1430 fs/splice.c:1175 __do_sys_splice fs/splice.c:1419 [inline] __se_sys_splice fs/splice.c:1399 [inline] __x64_sys_splice+0x2c1/0x330 fs/splice.c:1399 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457659 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f880a056c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000457659 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 000000000072bf00 R08: 000000000000ced1 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f880a0576d4 R13: 00000000004c5aac R14: 00000000004d9740 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1020: #0: 0000000061fae8ef (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4379 1 lock held by rsyslogd/5946: #0: 0000000045e8bcfb (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 2 locks held by getty/6036: #0: 0000000098c99775 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000001eb74cef (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/6037: #0: 000000006b35ba47 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000ff59755f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/6038: #0: 0000000031429645 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000eeea135f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/6039: #0: 0000000005e2722e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000003c4a538b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/6040: #0: 0000000050951d76 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000f32519da (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/6041: #0: 00000000ad3272bd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000e7aaca10 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/6042: #0: 0000000083b41b4f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000001eca6850 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 1 lock held by syz-executor4/6167: #0: 00000000e989f9c3 (rcu_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:296 [inline] #0: 00000000e989f9c3 (rcu_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited.constprop.58+0x7c7/0x9d0 kernel/rcu/tree_exp.h:620 1 lock held by syz-executor1/10326: #0: 000000001c69840c (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:62 [inline] #0: 000000001c69840c (&pipe->mutex/1){+.+.}, at: pipe_lock+0x6e/0x80 fs/pipe.c:70 1 lock held by syz-executor1/10334: #0: 000000001c69840c (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:62 [inline] #0: 000000001c69840c (&pipe->mutex/1){+.+.}, at: pipe_lock+0x6e/0x80 fs/pipe.c:70 1 lock held by syz-executor1/10355: #0: 000000001c69840c (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:62 [inline] #0: 000000001c69840c (&pipe->mutex/1){+.+.}, at: pipe_lock+0x6e/0x80 fs/pipe.c:70 1 lock held by syz-executor0/19146: #0: 000000005bbb8e0c (&vcpu->mutex){+.+.}, at: kvm_vcpu_ioctl+0x1e5/0x1150 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2573 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1020 Comm: khungtaskd Not tainted 4.20.0-rc6+ #373 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+0x244/0x39d lib/dump_stack.c:113 nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1e8/0x22a 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+0xb51/0x1060 kernel/hung_task.c:289 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.266 msecs NMI backtrace for cpu 0 CPU: 0 PID: 19146 Comm: syz-executor0 Not tainted 4.20.0-rc6+ #373 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x48/0x50 kernel/kcov.c:108 Code: 75 2b 8b 90 d8 12 00 00 83 fa 02 75 20 48 8b 88 e0 12 00 00 8b 80 dc 12 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 <48> 89 11 5d c3 0f 1f 00 55 40 0f b6 d6 40 0f b6 f7 31 ff 48 89 e5 RSP: 0018:ffff888184abf3a0 EFLAGS: 00000016 RAX: 0000000000040000 RBX: 1ffff11030957e79 RCX: ffffc900063e9000 RDX: 0000000000004813 RSI: ffffffff8185ad63 RDI: 0000000000000005 RBP: ffff888184abf3a0 R08: ffff8881be6500c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8881d9055af0 R14: ffffffff81c2fd91 R15: ffff8881d7a26e00 FS: 00007feb81e28700(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000070b6b4 CR3: 00000001c01d3000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_static_branch arch/x86/include/asm/jump_label.h:23 [inline] static_key_false include/linux/jump_label.h:204 [inline] trace_irq_enable_rcuidle include/trace/events/preemptirq.h:40 [inline] trace_hardirqs_on+0x113/0x310 kernel/trace/trace_preemptirq.c:25 qlink_free mm/kasan/quarantine.c:150 [inline] qlist_free_all+0xe1/0x140 mm/kasan/quarantine.c:166 quarantine_reduce+0x163/0x1a0 mm/kasan/quarantine.c:259 kasan_kmalloc+0x9b/0xe0 mm/kasan/kasan.c:538 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 slab_post_alloc_hook mm/slab.h:444 [inline] slab_alloc mm/slab.c:3392 [inline] kmem_cache_alloc_trace+0x13b/0x750 mm/slab.c:3618 kmalloc include/linux/slab.h:546 [inline] kzalloc include/linux/slab.h:741 [inline] kvm_uevent_notify_change.part.32+0x11f/0x450 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3903 kvm_uevent_notify_change arch/x86/kvm/../../../virt/kvm/kvm_main.c:3889 [inline] kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:729 [inline] kvm_put_kvm+0x182/0xff0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:770 kvm_vcpu_release+0x7b/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2413 __fput+0x385/0xa30 fs/file_table.c:278 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 get_signal+0x1558/0x1980 kernel/signal.c:2347 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x2e5/0x380 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+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457659 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007feb81e27c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 0000000000457659 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006 RBP: 000000000072c0e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007feb81e286d4 R13: 00000000004c0505 R14: 00000000004d1580 R15: 00000000ffffffff kobject: '0:61' (000000003eb1fc73): kobject_cleanup, parent (null) kobject: 'kvm' (00000000fe4838f2): kobject_uevent_env kobject: '0:61' (000000003eb1fc73): calling ktype release kobject: 'kvm' (00000000fe4838f2): fill_kobj_path: path = '/devices/virtual/misc/kvm'