[ 39.437127] audit: type=1800 audit(1550282181.617:25): pid=7651 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 39.464005] audit: type=1800 audit(1550282181.617:26): pid=7651 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 39.483395] audit: type=1800 audit(1550282181.627:27): pid=7651 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 39.515392] audit: type=1800 audit(1550282181.627:28): pid=7651 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 '10.128.0.71' (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 syzkaller login: [ 56.983656] WARNING: CPU: 0 PID: 8261 at kernel/events/core.c:1833 perf_group_attach+0x3fd/0x4d0 [ 56.992984] Kernel panic - not syncing: panic_on_warn set ... [ 56.998976] CPU: 0 PID: 8261 Comm: syz-executor874 Not tainted 5.0.0-rc6+ #73 [ 57.006232] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.015571] Call Trace: [ 57.018213] dump_stack+0x172/0x1f0 [ 57.021906] ? perf_group_attach+0x340/0x4d0 [ 57.026325] panic+0x2cb/0x65c [ 57.029505] ? __warn_printk+0xf3/0xf3 [ 57.033375] ? perf_group_attach+0x3fd/0x4d0 [ 57.037762] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.043277] ? __warn.cold+0x5/0x45 [ 57.046891] ? __warn+0xe8/0x1d0 [ 57.050248] ? perf_group_attach+0x3fd/0x4d0 [ 57.054645] __warn.cold+0x20/0x45 [ 57.058181] ? perf_group_attach+0x3fd/0x4d0 [ 57.062589] report_bug+0x263/0x2b0 [ 57.066200] do_error_trap+0x11b/0x200 [ 57.070069] do_invalid_op+0x37/0x50 [ 57.073778] ? perf_group_attach+0x3fd/0x4d0 [ 57.078167] invalid_op+0x14/0x20 [ 57.081787] RIP: 0010:perf_group_attach+0x3fd/0x4d0 [ 57.086787] 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 53 56 ec ff <0f> 0b e9 55 fd ff ff 48 c7 c7 f8 a7 5c 89 e8 60 54 23 00 e9 5b fc [ 57.105696] RSP: 0018:ffff888089cdfa90 EFLAGS: 00010093 [ 57.111057] RAX: ffff88808d6361c0 RBX: ffff88808ff7d700 RCX: ffffffff81838798 [ 57.118323] RDX: 0000000000000000 RSI: ffffffff81838abd RDI: ffff88808ff7d918 [ 57.125580] RBP: ffff888089cdfac0 R08: ffff88808d6361c0 R09: ffffffff89997008 [ 57.132934] R10: ffffffff89997010 R11: 0000000000000001 R12: ffff888086670500 [ 57.140208] R13: ffffe8ffffc13380 R14: 0000000000000000 R15: ffff8880ae832048 [ 57.147483] ? perf_group_attach+0xd8/0x4d0 [ 57.151813] ? perf_group_attach+0x3fd/0x4d0 [ 57.156236] __perf_install_in_context+0x4b5/0x960 [ 57.161146] ? __perf_event_enable+0x920/0x920 [ 57.165711] ? perf_duration_warn+0x40/0x40 [ 57.170015] remote_function+0x12b/0x1a0 [ 57.174063] generic_exec_single+0x284/0x4b0 [ 57.178462] smp_call_function_single+0x12d/0x420 [ 57.183294] ? perf_duration_warn+0x40/0x40 [ 57.187605] ? generic_exec_single+0x4b0/0x4b0 [ 57.192180] perf_install_in_context+0x369/0x3d0 [ 57.196986] ? list_add_event+0xcd0/0xcd0 [ 57.201130] ? __perf_event_enable+0x920/0x920 [ 57.205700] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 57.211219] __do_sys_perf_event_open+0x18fa/0x2690 [ 57.216223] ? perf_event_set_output+0x4e0/0x4e0 [ 57.220972] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 57.225841] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 57.230699] ? do_syscall_64+0x26/0x610 [ 57.234683] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 57.240041] ? do_syscall_64+0x26/0x610 [ 57.244002] __x64_sys_perf_event_open+0xbe/0x150 [ 57.248873] do_syscall_64+0x103/0x610 [ 57.252748] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 57.257920] RIP: 0033:0x448b29 [ 57.261100] Code: e8 dc e6 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 4b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 57.279990] RSP: 002b:00007f7e1266cce8 EFLAGS: 00000246 ORIG_RAX: 000000000000012a [ 57.287685] RAX: ffffffffffffffda RBX: 00000000006dec38 RCX: 0000000000448b29 [ 57.294935] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000020000000 [ 57.302189] RBP: 00000000006dec30 R08: 0000000000000000 R09: 0000000000000000 [ 57.309441] R10: 0000000000000003 R11: 0000000000000246 R12: 00000000006dec3c [ 57.316694] R13: 00007ffc4dba503f R14: 00007f7e1266d9c0 R15: 20c49ba5e353f7cf [ 57.325111] Kernel Offset: disabled [ 57.328798] Rebooting in 86400 seconds..