[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.521928][ T26] audit: type=1800 audit(1550277875.170:25): pid=7745 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 39.557086][ T26] audit: type=1800 audit(1550277875.170:26): pid=7745 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 39.594664][ T26] audit: type=1800 audit(1550277875.180:27): pid=7745 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.228' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 96.217628][ T8167] WARNING: CPU: 0 PID: 8167 at kernel/events/core.c:1834 perf_group_attach+0x3fd/0x4d0 [ 96.227476][ T8167] Kernel panic - not syncing: panic_on_warn set ... [ 96.234071][ T8167] CPU: 0 PID: 8167 Comm: syz-executor477 Not tainted 5.0.0-rc6-next-20190215 #36 [ 96.243175][ T8167] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 96.253236][ T8167] Call Trace: [ 96.256551][ T8167] dump_stack+0x172/0x1f0 [ 96.260897][ T8167] ? perf_group_attach+0x320/0x4d0 [ 96.266020][ T8167] panic+0x2cb/0x65c [ 96.269928][ T8167] ? __warn_printk+0xf3/0xf3 [ 96.274529][ T8167] ? perf_group_attach+0x3fd/0x4d0 [ 96.279654][ T8167] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 96.285911][ T8167] ? __warn.cold+0x5/0x45 [ 96.290249][ T8167] ? __warn+0xe8/0x1d0 [ 96.294332][ T8167] ? perf_group_attach+0x3fd/0x4d0 [ 96.299455][ T8167] __warn.cold+0x20/0x45 [ 96.303704][ T8167] ? perf_group_attach+0x3fd/0x4d0 [ 96.308839][ T8167] report_bug+0x263/0x2b0 [ 96.313183][ T8167] do_error_trap+0x11b/0x200 [ 96.317783][ T8167] do_invalid_op+0x37/0x50 [ 96.322214][ T8167] ? perf_group_attach+0x3fd/0x4d0 [ 96.327331][ T8167] invalid_op+0x14/0x20 [ 96.331493][ T8167] RIP: 0010:perf_group_attach+0x3fd/0x4d0 [ 96.337208][ T8167] Code: ff 48 8d 7b 10 48 89 f8 48 c1 e8 03 42 80 3c 28 00 75 57 48 8b 5b 10 48 83 eb 10 49 39 dc 75 d4 e9 20 ff ff ff e8 23 e9 eb ff <0f> 0b e9 55 fd ff ff 48 c7 c7 58 88 5d 89 e8 90 ba 23 00 e9 5b fc [ 96.356821][ T8167] RSP: 0018:ffff88807975fa90 EFLAGS: 00010093 [ 96.362907][ T8167] RAX: ffff88805641a3c0 RBX: ffff88805646c500 RCX: ffffffff818475b8 [ 96.370891][ T8167] RDX: 0000000000000000 RSI: ffffffff818478dd RDI: ffff88805646c718 [ 96.378874][ T8167] RBP: ffff88807975fac0 R08: ffff88805641a3c0 R09: ffffffff899a9008 [ 96.386861][ T8167] R10: ffffffff899a9010 R11: 0000000000000001 R12: ffff888056408d00 [ 96.394850][ T8167] R13: ffffe8ffffc13780 R14: 0000000000000000 R15: ffff8880ae832048 [ 96.402862][ T8167] ? perf_group_attach+0xd8/0x4d0 [ 96.407895][ T8167] ? perf_group_attach+0x3fd/0x4d0 [ 96.413024][ T8167] __perf_install_in_context+0x4b5/0x960 [ 96.418667][ T8167] ? __perf_event_enable+0x920/0x920 [ 96.423953][ T8167] ? perf_duration_warn+0x40/0x40 [ 96.428976][ T8167] remote_function+0x12b/0x1a0 [ 96.433763][ T8167] generic_exec_single+0x284/0x4b0 [ 96.438878][ T8167] smp_call_function_single+0x12d/0x420 [ 96.444433][ T8167] ? _raw_spin_unlock+0x2d/0x50 [ 96.449290][ T8167] ? perf_duration_warn+0x40/0x40 [ 96.454338][ T8167] ? generic_exec_single+0x4b0/0x4b0 [ 96.459640][ T8167] ? __do_sys_perf_event_open+0x1a46/0x24d0 [ 96.465565][ T8167] perf_install_in_context+0x369/0x3d0 [ 96.471045][ T8167] ? list_add_event+0xcd0/0xcd0 [ 96.475908][ T8167] ? __perf_event_enable+0x920/0x920 [ 96.481204][ T8167] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 96.487453][ T8167] __do_sys_perf_event_open+0x1843/0x24d0 [ 96.493202][ T8167] ? perf_event_set_output+0x4e0/0x4e0 [ 96.498698][ T8167] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 96.504189][ T8167] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 96.509705][ T8167] ? do_syscall_64+0x26/0x610 [ 96.514419][ T8167] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 96.520501][ T8167] ? do_syscall_64+0x26/0x610 [ 96.525200][ T8167] __x64_sys_perf_event_open+0xbe/0x150 [ 96.530770][ T8167] do_syscall_64+0x103/0x610 [ 96.535374][ T8167] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 96.541301][ T8167] RIP: 0033:0x446659 [ 96.545201][ T8167] Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 7b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 96.564816][ T8167] RSP: 002b:00007f1a8f1b0db8 EFLAGS: 00000246 ORIG_RAX: 000000000000012a [ 96.573255][ T8167] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000446659 [ 96.581233][ T8167] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000020000000 [ 96.589204][ T8167] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 96.597215][ T8167] R10: 0000000000000003 R11: 0000000000000246 R12: 00000000006dbc2c [ 96.605189][ T8167] R13: 00007ffc1e4742bf R14: 00007f1a8f1b19c0 R15: 000000000000002d [ 96.614442][ T8167] Kernel Offset: disabled [ 96.618816][ T8167] Rebooting in 86400 seconds..