On Mon, Aug 27, 2018 at 10:10 AM, syzbot <syzbot+97aae04ce27e39cbfca9@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: e27bc174c9c6 Add linux-next specific files for 20180824 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=16e0823e400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=28446088176757ea > dashboard link: https://syzkaller.appspot.com/bug?extid=97aae04ce27e39cbfca9 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1756c50e400000 This seems to have been attributed to some x86 file, I will take a look as to why. +ALSA maintainers > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+97aae04ce27e39cbfca9@xxxxxxxxxxxxxxxxxxxxxxxxx > > 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 > 8021q: adding VLAN 0 to HW filter on device team0 > 8021q: adding VLAN 0 to HW filter on device team0 > rcu: INFO: rcu_sched self-detected stall on CPU > rcu: 0-....: (105000 ticks this GP) idle=2f6/1/0x4000000000000002 > softirq=23001/23001 fqs=26239 > rcu: (t=105008 jiffies g=49145 q=2382) > NMI backtrace for cpu 0 > CPU: 0 PID: 8551 Comm: syz-executor7 Not tainted 4.18.0-next-20180824+ #47 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > <IRQ> > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 > nmi_cpu_backtrace.cold.3+0x48/0x88 lib/nmi_backtrace.c:101 > nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62 > arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 > trigger_single_cpu_backtrace include/linux/nmi.h:162 [inline] > rcu_dump_cpu_stacks+0x175/0x1c2 kernel/rcu/tree.c:1340 > print_cpu_stall.cold.78+0x2fb/0x59c kernel/rcu/tree.c:1478 > check_cpu_stall kernel/rcu/tree.c:1550 [inline] > __rcu_pending kernel/rcu/tree.c:3276 [inline] > rcu_pending kernel/rcu/tree.c:3319 [inline] > rcu_check_callbacks+0xd4a/0x15a0 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+0x3eb/0xff0 kernel/time/hrtimer.c:1460 > hrtimer_interrupt+0x2f3/0x750 kernel/time/hrtimer.c:1518 > local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1029 [inline] > smp_apic_timer_interrupt+0x16d/0x6a0 arch/x86/kernel/apic/apic.c:1054 > apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:867 > </IRQ> > RIP: 0010:lock_release+0xa2/0x9f0 kernel/locking/lockdep.c:3910 > Code: f2 c7 40 08 f2 f2 f2 f2 c7 40 0c 00 f2 f2 f2 c7 40 10 f2 f2 f2 f2 c7 > 40 14 00 f2 f2 f2 65 48 8b 04 25 28 00 00 00 48 89 45 d0 <31> c0 48 89 f8 48 > c1 e8 03 0f b6 14 10 48 89 f8 83 e0 07 83 c0 03 > RSP: 0018:ffff8801aa0078c8 EFLAGS: 00000292 ORIG_RAX: ffffffffffffff13 > RAX: 2ec5cd2493d34200 RBX: 1ffff10035400f1e RCX: 0000000000000000 > RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff8801a9b56bbc > RBP: ffff8801aa0079f8 R08: 00000000000010df R09: 0000000000000001 > R10: ffff8801a9b56be8 R11: 737c3e5c87308161 R12: ffff8801aa0079d0 > R13: ffff8801c778d4c8 R14: ffff8801aa007ae0 R15: ffff8801a9b56380 > __might_fault+0x19e/0x1e0 mm/memory.c:4585 > _copy_from_user+0x30/0x150 lib/usercopy.c:10 > copy_from_user include/linux/uaccess.h:147 [inline] > snd_seq_write+0x472/0x8d0 sound/core/seq/seq_clientmgr.c:1033 > __vfs_write+0x117/0x9d0 fs/read_write.c:485 > vfs_write+0x1fc/0x560 fs/read_write.c:549 > ksys_write+0x101/0x260 fs/read_write.c:598 > __do_sys_write fs/read_write.c:610 [inline] > __se_sys_write fs/read_write.c:607 [inline] > __x64_sys_write+0x73/0xb0 fs/read_write.c:607 > do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x457089 > 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:00007f09af65dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 > RAX: ffffffffffffffda RBX: 00007f09af65e6d4 RCX: 0000000000457089 > RDX: 00000000ffffff76 RSI: 0000000020000000 RDI: 0000000000000003 > RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff > R13: 00000000004d78a8 R14: 00000000004ca886 R15: 0000000000000000 > > > --- > 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/000000000000e5050205746dcbb0%40google.com. > For more options, visit https://groups.google.com/d/optout.
