On Tue, Sep 11, 2018 at 8:12 AM, syzbot <syzbot+b3fdc9590894087f1188@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 3d0e7a9e00fd Merge tag 'md/4.19-rc2' of git://git.kernel.o.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=12820cd1400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=8f59875069d721b6 > dashboard link: https://syzkaller.appspot.com/bug?extid=b3fdc9590894087f1188 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16940056400000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+b3fdc9590894087f1188@xxxxxxxxxxxxxxxxxxxxxxxxx #syz dup: INFO: rcu detected stall in kvm_vcpu_ioctl > 8021q: adding VLAN 0 to HW filter on device team0 > 8021q: adding VLAN 0 to HW filter on device team0 > 8021q: adding VLAN 0 to HW filter on device team0 > hrtimer: interrupt took 32920 ns > L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and > https://www.kernel.org/doc/html/latest/admin-guide/l1tf.html for details. > rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: > rcu: (detected by 1, t=10502 jiffies, g=7509, q=466) > rcu: All QSes seen, last rcu_preempt kthread activity 10502 > (4295044073-4295033571), jiffies_till_next_fqs=1, root ->qsmask 0x0 > syz-executor7 R running task 23424 7586 5576 0x00000000 > Call Trace: > <IRQ> > sched_show_task.cold.83+0x2b6/0x30a kernel/sched/core.c:5296 > print_other_cpu_stall.cold.79+0xa83/0xba5 kernel/rcu/tree.c:1430 > check_cpu_stall kernel/rcu/tree.c:1557 [inline] > __rcu_pending kernel/rcu/tree.c:3276 [inline] > rcu_pending kernel/rcu/tree.c:3319 [inline] > rcu_check_callbacks+0xafc/0x1990 kernel/rcu/tree.c:2665 > update_process_times+0x2d/0x70 kernel/time/timer.c:1636 > tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164 > tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274 > __run_hrtimer kernel/time/hrtimer.c:1398 [inline] > __hrtimer_run_queues+0x41c/0x10d0 kernel/time/hrtimer.c:1460 > hrtimer_interrupt+0x313/0x780 kernel/time/hrtimer.c:1518 > local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1029 [inline] > smp_apic_timer_interrupt+0x1a1/0x760 arch/x86/kernel/apic/apic.c:1054 > apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:864 > </IRQ> > RIP: 0010:arch_local_irq_enable arch/x86/include/asm/paravirt.h:798 [inline] > RIP: 0010:vcpu_enter_guest+0x12ad/0x62e0 arch/x86/kvm/x86.c:7610 > Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b7 4a 00 00 48 83 3d bd 8c 43 08 > 00 0f 84 b1 3d 00 00 e8 3a 32 70 00 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 > 09 cf 46 00 31 ff 65 44 8b 25 af 50 f3 7e 44 89 > RSP: 0018:ffff8801b116f4f0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 > RAX: ffff8801cd182680 RBX: ffff8801d97f8080 RCX: 1ffff10039a305e4 > RDX: 0000000000000000 RSI: ffffffff810e9d06 RDI: ffffffff895229b8 > RBP: ffff8801b116f840 R08: ffff8801cd182f20 R09: 0000000000000006 > R10: 0000000000000000 R11: ffff8801cd182680 R12: ffff8801cd182680 > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 > vcpu_run arch/x86/kvm/x86.c:7693 [inline] > kvm_arch_vcpu_ioctl_run+0x375/0x16e0 arch/x86/kvm/x86.c:7870 > kvm_vcpu_ioctl+0x72b/0x1150 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2590 > vfs_ioctl fs/ioctl.c:46 [inline] > file_ioctl fs/ioctl.c:501 [inline] > do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 > ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 > __do_sys_ioctl fs/ioctl.c:709 [inline] > __se_sys_ioctl fs/ioctl.c:707 [inline] > __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 > do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x457099 > Code: fd b4 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 b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007ffdfe480958 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 0000000001598914 RCX: 0000000000457099 > RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006 > RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff > R13: 00000000004cf730 R14: 00000000004c59b9 R15: 0000000000000000 > rcu: rcu_preempt kthread starved for 10502 jiffies! g7509 f0x2 > RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 > rcu: RCU grace-period kthread stack dump: > rcu_preempt R running task 22872 10 2 0x80000000 > Call Trace: > context_switch kernel/sched/core.c:2825 [inline] > __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473 > schedule+0xfe/0x460 kernel/sched/core.c:3517 > schedule_timeout+0x140/0x260 kernel/time/timer.c:1804 > rcu_gp_kthread+0x9d9/0x2310 kernel/rcu/tree.c:2194 > kthread+0x35a/0x420 kernel/kthread.c:246 > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413 > > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with > syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches > > -- > You received this message because you are subscribed to the Google Groups > "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/0000000000004e8a8c0575925aa2%40google.com. > For more options, visit https://groups.google.com/d/optout.
