On Fri, Apr 6, 2018 at 3:24 PM, syzbot <syzbot+74e011b2046f4322d178@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzbot hit the following crash on upstream commit > 38c23685b273cfb4ccf31a199feccce3bdcb5d83 (Fri Apr 6 04:29:35 2018 +0000) > Merge tag 'armsoc-drivers' of > git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc > syzbot dashboard link: > https://syzkaller.appspot.com/bug?extid=74e011b2046f4322d178 > > Unfortunately, I don't have any reproducer for this crash yet. > Raw console output: > https://syzkaller.appspot.com/x/log.txt?id=4582053840420864 > Kernel config: > https://syzkaller.appspot.com/x/.config?id=-5813481738265533882 > compiler: gcc (GCC) 8.0.1 20180301 (experimental) +ALSA maintainers This was misattributed to kcov.c, I will fix it. > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+74e011b2046f4322d178@xxxxxxxxxxxxxxxxxxxxxxxxx > It will help syzbot understand when the bug is fixed. See footer for > details. > If you forward the report, please keep this part and the footer. > > syz-executor1 (6140) used greatest stack depth: 11720 bytes left > INFO: rcu_sched self-detected stall on CPU > 1-....: (124998 ticks this GP) idle=0b2/1/4611686018427387906 > softirq=15730/15730 fqs=31205 > (t=125000 jiffies g=8316 c=8315 q=1529) > NMI backtrace for cpu 1 > CPU: 1 PID: 6087 Comm: syz-executor0 Not tainted 4.16.0+ #3 > 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+0x1b9/0x294 lib/dump_stack.c:113 > nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103 > 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:156 [inline] > rcu_dump_cpu_stacks+0x175/0x1c2 kernel/rcu/tree.c:1376 > print_cpu_stall kernel/rcu/tree.c:1525 [inline] > check_cpu_stall.isra.61.cold.80+0x36c/0x59a kernel/rcu/tree.c:1593 > __rcu_pending kernel/rcu/tree.c:3356 [inline] > rcu_pending kernel/rcu/tree.c:3401 [inline] > rcu_check_callbacks+0x21b/0xad0 kernel/rcu/tree.c:2763 > update_process_times+0x2d/0x70 kernel/time/timer.c:1636 > tick_sched_handle+0xa0/0x180 kernel/time/tick-sched.c:171 > tick_sched_timer+0x42/0x130 kernel/time/tick-sched.c:1179 > __run_hrtimer kernel/time/hrtimer.c:1337 [inline] > __hrtimer_run_queues+0x3e3/0x10a0 kernel/time/hrtimer.c:1399 > hrtimer_interrupt+0x286/0x650 kernel/time/hrtimer.c:1457 > local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline] > smp_apic_timer_interrupt+0x15d/0x710 arch/x86/kernel/apic/apic.c:1050 > apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:862 > </IRQ> > RIP: 0010:__sanitizer_cov_trace_pc+0x3f/0x50 kernel/kcov.c:106 > RSP: 0018:ffff8801920cf4d0 EFLAGS: 00000216 ORIG_RAX: ffffffffffffff13 > RAX: 0000000000040000 RBX: ffff8801ceb61200 RCX: ffffc90001eb0000 > RDX: 0000000000040000 RSI: ffffffff859d760f RDI: ffff8801ceb61200 > RBP: ffff8801920cf4d0 R08: ffff8801b4946540 R09: 0000000000000006 > R10: ffff8801b4946540 R11: 0000000000000000 R12: ffffffff8826fa20 > R13: 0000000000000020 R14: ffff8801d3008c00 R15: ffff8801ceb61200 > snd_pcm_stream_lock_irq+0xf/0xf0 sound/core/pcm_native.c:150 > __snd_pcm_lib_xfer+0x345/0x1d10 sound/core/pcm_lib.c:2162 > snd_pcm_oss_write3+0xe9/0x220 sound/core/oss/pcm_oss.c:1236 > io_playback_transfer+0x274/0x310 sound/core/oss/io.c:47 > snd_pcm_plug_write_transfer+0x36c/0x470 sound/core/oss/pcm_plugin.c:619 > snd_pcm_oss_write2+0x25c/0x460 sound/core/oss/pcm_oss.c:1365 > snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1431 [inline] > snd_pcm_oss_write+0x55f/0xa20 sound/core/oss/pcm_oss.c:2774 > do_loop_readv_writev fs/read_write.c:703 [inline] > do_iter_write+0x491/0x5f0 fs/read_write.c:961 > vfs_writev+0x1c7/0x330 fs/read_write.c:1004 > do_writev+0x112/0x2f0 fs/read_write.c:1039 > SYSC_writev fs/read_write.c:1112 [inline] > SyS_writev+0x27/0x30 fs/read_write.c:1109 > do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 > entry_SYSCALL_64_after_hwframe+0x42/0xb7 > RIP: 0033:0x4552d9 > RSP: 002b:00007f82ef52cc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 > RAX: ffffffffffffffda RBX: 00007f82ef52d6d4 RCX: 00000000004552d9 > RDX: 0000000000000001 RSI: 0000000020000180 RDI: 0000000000000015 > RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff > R13: 00000000000006cc R14: 00000000006fd3c0 R15: 0000000000000000 > > > --- > This bug is generated by a dumb bot. It may contain errors. > See https://goo.gl/tpsmEJ for details. > Direct all questions to syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. > If you forgot to add the Reported-by tag, once the fix for this bug is > merged > into any tree, please reply to this email with: > #syz fix: exact-commit-title > To mark this as a duplicate of another syzbot report, please reply with: > #syz dup: exact-subject-of-another-report > If it's a one-off invalid bug report, please reply with: > #syz invalid > Note: if the crash happens again, it will cause creation of a new bug > report. > Note: all commands must start from beginning of the line in the email body. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
