[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 42.381861] audit: type=1800 audit(1547676551.660:25): pid=7987 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 42.412929] audit: type=1800 audit(1547676551.660:26): pid=7987 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 42.444778] audit: type=1800 audit(1547676551.660:27): pid=7987 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.0.104' (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 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: [ 57.609093] WARNING: CPU: 0 PID: 8676 at kernel/events/core.c:1833 perf_group_attach+0x4d9/0x610 [ 57.618331] Kernel panic - not syncing: panic_on_warn set ... [ 57.624233] CPU: 0 PID: 8676 Comm: syz-executor615 Not tainted 5.0.0-rc2+ #29 [ 57.631723] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.641150] Call Trace: [ 57.643762] dump_stack+0x1db/0x2d0 [ 57.647375] ? dump_stack_print_info.cold+0x20/0x20 [ 57.652403] ? __lock_acquire+0x572/0x4a30 [ 57.656630] ? perf_group_attach+0x4d0/0x610 [ 57.661027] panic+0x2cb/0x65c [ 57.664212] ? add_taint.cold+0x16/0x16 [ 57.668241] ? perf_group_attach+0x4d9/0x610 [ 57.672639] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.678157] ? __probe_kernel_read+0x1f4/0x250 [ 57.682728] ? __warn.cold+0x5/0x48 [ 57.686344] ? __warn+0xe8/0x1d0 [ 57.689731] ? perf_group_attach+0x4d9/0x610 [ 57.694232] __warn.cold+0x20/0x48 [ 57.697772] ? perf_group_attach+0x4d9/0x610 [ 57.702205] report_bug+0x263/0x2b0 [ 57.705828] do_error_trap+0x11b/0x200 [ 57.709702] do_invalid_op+0x37/0x50 [ 57.713399] ? perf_group_attach+0x4d9/0x610 [ 57.717793] invalid_op+0x14/0x20 [ 57.721224] RIP: 0010:perf_group_attach+0x4d9/0x610 [ 57.726226] Code: ff 48 8d 7b 10 48 89 f8 48 c1 e8 03 42 80 3c 30 00 75 57 48 8b 5b 10 48 83 eb 10 49 39 dc 75 d4 e9 fa fe ff ff e8 e7 bf e8 ff <0f> 0b e9 cc fc ff ff 48 c7 c7 38 df 5b 8a e8 64 b0 2c 00 e9 cb fb [ 57.745148] RSP: 0018:ffff8880971e7768 EFLAGS: 00010093 [ 57.750640] RAX: ffff88808bb866c0 RBX: ffff8880a7acc000 RCX: ffffffff81993b56 [ 57.757892] RDX: 0000000000000000 RSI: ffffffff81993f09 RDI: ffff8880a7acc218 [ 57.765141] RBP: ffff8880971e7808 R08: ffff88808bb866c0 R09: ffffffff8a9a901d [ 57.772394] R10: ffffffff8a9a9010 R11: 0000000000000001 R12: ffff88808bb34640 [ 57.779647] R13: 1ffff11012e3cef0 R14: ffff8880971e77e0 R15: ffffe8ffffc13180 [ 57.786909] ? perf_group_attach+0x126/0x610 [ 57.791416] ? perf_group_attach+0x4d9/0x610 [ 57.795809] ? perf_group_attach+0x4d9/0x610 [ 57.800201] ? perf_iterate_ctx+0x880/0x880 [ 57.804510] ? perf_addr_filters_splice+0x830/0x830 [ 57.809513] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.815039] ? ctx_sched_out+0x167/0xa30 [ 57.819105] __perf_install_in_context+0x5c0/0xb70 [ 57.824017] ? __perf_event_enable+0x8d0/0x8d0 [ 57.828582] ? trace_hardirqs_off+0xb8/0x310 [ 57.832971] ? lock_acquire+0x1db/0x570 [ 57.837050] ? smp_call_function_single+0x1a9/0x660 [ 57.842052] ? trace_hardirqs_on_caller+0x310/0x310 [ 57.847052] ? __perf_event_enable+0x8d0/0x8d0 [ 57.851618] remote_function+0x12b/0x1a0 [ 57.855662] generic_exec_single+0x383/0x610 [ 57.860053] ? perf_duration_warn+0x40/0x40 [ 57.864366] ? smp_call_on_cpu+0x590/0x590 [ 57.868602] ? _raw_spin_unlock+0x2d/0x50 [ 57.872747] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.878269] ? check_preemption_disabled+0x48/0x290 [ 57.883278] smp_call_function_single+0x1a9/0x660 [ 57.888123] ? perf_duration_warn+0x40/0x40 [ 57.892443] ? mutex_trylock+0x2d0/0x2d0 [ 57.896506] ? generic_exec_single+0x610/0x610 [ 57.901070] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.906591] ? __lock_is_held+0xb6/0x140 [ 57.910688] ? alloc_empty_file+0xdc/0x170 [ 57.914938] perf_install_in_context+0x461/0x510 [ 57.919683] ? list_add_event+0x1050/0x1050 [ 57.923988] ? __perf_event_enable+0x8d0/0x8d0 [ 57.928561] ? perf_pin_task_context+0x130/0x130 [ 57.933303] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 57.938837] ? __perf_event_header_size.isra.0+0x166/0x1c0 [ 57.944464] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 57.949987] __do_sys_perf_event_open+0x1de8/0x2f00 [ 57.954990] ? perf_event_set_output+0x600/0x600 [ 57.959737] ? kasan_check_write+0x14/0x20 [ 57.964061] ? do_syscall_64+0x8c/0x800 [ 57.968022] ? lockdep_hardirqs_on+0x415/0x5d0 [ 57.972585] ? trace_hardirqs_on+0xbd/0x310 [ 57.976897] ? do_futex+0x2910/0x2910 [ 57.980700] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 57.986048] ? trace_hardirqs_off_caller+0x300/0x300 [ 57.991150] __x64_sys_perf_event_open+0xbe/0x150 [ 57.996076] do_syscall_64+0x1a3/0x800 [ 57.999951] ? syscall_return_slowpath+0x5f0/0x5f0 [ 58.004863] ? prepare_exit_to_usermode+0x232/0x3b0 [ 58.009891] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 58.014753] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 58.019932] RIP: 0033:0x446619 [ 58.023113] 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 [ 58.042095] RSP: 002b:00007f7a83c60db8 EFLAGS: 00000246 ORIG_RAX: 000000000000012a [ 58.049907] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000446619 [ 58.057156] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000020000000 [ 58.064411] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 58.071660] R10: 0000000000000003 R11: 0000000000000246 R12: 00000000006dbc2c [ 58.078926] R13: 00007ffd55585ddf R14: 00007f7a83c619c0 R15: 00000000006dbc20 [ 58.087147] Kernel Offset: disabled [ 58.090829] Rebooting in 86400 seconds..