[ 42.251436][ T26] audit: type=1800 audit(1555078939.540:25): pid=7576 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 42.287232][ T26] audit: type=1800 audit(1555078939.540:26): pid=7576 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 42.310902][ T26] audit: type=1800 audit(1555078939.540:27): pid=7576 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 42.332170][ T26] audit: type=1800 audit(1555078939.540:28): pid=7576 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 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 '10.128.1.14' (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 syzkaller login: [ 83.508673][ T8295] WARNING: CPU: 0 PID: 8295 at kernel/events/core.c:1835 perf_group_attach+0x3fd/0x4d0 [ 83.518925][ T8295] Kernel panic - not syncing: panic_on_warn set ... [ 83.525781][ T8295] CPU: 0 PID: 8295 Comm: syz-executor203 Not tainted 5.1.0-rc4+ #64 [ 83.534069][ T8295] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 83.545508][ T8295] Call Trace: [ 83.548892][ T8295] dump_stack+0x172/0x1f0 [ 83.553418][ T8295] ? perf_group_attach+0x340/0x4d0 [ 83.558605][ T8295] panic+0x2cb/0x65c [ 83.563082][ T8295] ? __warn_printk+0xf3/0xf3 [ 83.567837][ T8295] ? perf_group_attach+0x3fd/0x4d0 [ 83.573108][ T8295] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 83.579948][ T8295] ? __warn.cold+0x5/0x45 [ 83.584315][ T8295] ? __warn+0xe8/0x1d0 [ 83.588599][ T8295] ? perf_group_attach+0x3fd/0x4d0 [ 83.593785][ T8295] __warn.cold+0x20/0x45 [ 83.598099][ T8295] ? perf_group_attach+0x3fd/0x4d0 [ 83.603205][ T8295] report_bug+0x263/0x2b0 [ 83.607761][ T8295] do_error_trap+0x11b/0x200 [ 83.612522][ T8295] do_invalid_op+0x37/0x50 [ 83.617005][ T8295] ? perf_group_attach+0x3fd/0x4d0 [ 83.622894][ T8295] invalid_op+0x14/0x20 [ 83.627301][ T8295] RIP: 0010:perf_group_attach+0x3fd/0x4d0 [ 83.633611][ T8295] 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 43 b4 eb ff <0f> 0b e9 55 fd ff ff 48 c7 c7 18 61 5e 89 e8 c0 bb 23 00 e9 5b fc [ 83.653578][ T8295] RSP: 0018:ffff88808d18fa90 EFLAGS: 00010093 [ 83.660329][ T8295] RAX: ffff8880a85ca640 RBX: ffff88808c499200 RCX: ffffffff8184d798 [ 83.668307][ T8295] RDX: 0000000000000000 RSI: ffffffff8184dabd RDI: ffff88808c499418 [ 83.677333][ T8295] RBP: ffff88808d18fac0 R08: ffff8880a85ca640 R09: ffffffff899ba008 [ 83.685477][ T8295] R10: ffffffff899ba010 R11: 0000000000000001 R12: ffff88808d854000 [ 83.693700][ T8295] R13: ffffe8ffffc13ed0 R14: 0000000000000000 R15: ffff8880ae832048 [ 83.702413][ T8295] ? perf_group_attach+0xd8/0x4d0 [ 83.707421][ T8295] ? perf_group_attach+0x3fd/0x4d0 [ 83.712697][ T8295] __perf_install_in_context+0x4b5/0x960 [ 83.718417][ T8295] ? __perf_event_enable+0x920/0x920 [ 83.723768][ T8295] ? perf_duration_warn+0x40/0x40 [ 83.728965][ T8295] remote_function+0x12b/0x1a0 [ 83.733901][ T8295] generic_exec_single+0x284/0x4b0 [ 83.739289][ T8295] smp_call_function_single+0x12d/0x420 [ 83.745182][ T8295] ? _raw_spin_unlock+0x2d/0x50 [ 83.750227][ T8295] ? perf_duration_warn+0x40/0x40 [ 83.755232][ T8295] ? generic_exec_single+0x4b0/0x4b0 [ 83.760574][ T8295] ? __do_sys_perf_event_open+0x1a5b/0x24e0 [ 83.766636][ T8295] perf_install_in_context+0x369/0x3d0 [ 83.772520][ T8295] ? list_add_event+0xcd0/0xcd0 [ 83.777445][ T8295] ? __perf_event_enable+0x920/0x920 [ 83.782896][ T8295] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 83.789121][ T8295] __do_sys_perf_event_open+0x1858/0x24e0 [ 83.795091][ T8295] ? perf_event_set_output+0x4e0/0x4e0 [ 83.801083][ T8295] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 83.806893][ T8295] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 83.812421][ T8295] ? do_syscall_64+0x26/0x610 [ 83.817167][ T8295] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 83.823733][ T8295] ? do_syscall_64+0x26/0x610 [ 83.828880][ T8295] __x64_sys_perf_event_open+0xbe/0x150 [ 83.834637][ T8295] do_syscall_64+0x103/0x610 [ 83.839838][ T8295] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 83.847016][ T8295] RIP: 0033:0x448a39 [ 83.851538][ T8295] 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 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 83.872595][ T8295] RSP: 002b:00007fb5ec738ce8 EFLAGS: 00000246 ORIG_RAX: 000000000000012a [ 83.881403][ T8295] RAX: ffffffffffffffda RBX: 00000000006ddc38 RCX: 0000000000448a39 [ 83.889831][ T8295] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000020000000 [ 83.898239][ T8295] RBP: 00000000006ddc30 R08: 0000000000000000 R09: 0000000000000000 [ 83.906898][ T8295] R10: 0000000000000003 R11: 0000000000000246 R12: 00000000006ddc3c [ 83.916469][ T8295] R13: 00007fff520b84bf R14: 00007fb5ec7399c0 R15: 0000000000000001 [ 83.927445][ T8295] Kernel Offset: disabled [ 83.934084][ T8295] Rebooting in 86400 seconds..