[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 52.744972][ T26] audit: type=1800 audit(1560631500.696:25): pid=8363 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 52.782807][ T26] audit: type=1800 audit(1560631500.696:26): pid=8363 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 52.821032][ T26] audit: type=1800 audit(1560631500.696:27): pid=8363 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 '10.128.0.15' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 62.517817][ T8516] WARNING: CPU: 0 PID: 8516 at arch/x86/kernel/perf_regs.c:71 perf_reg_value+0xdb/0x110 [ 62.527652][ T8516] Kernel panic - not syncing: panic_on_warn set ... [ 62.534238][ T8516] CPU: 0 PID: 8516 Comm: syz-executor483 Not tainted 5.2.0-rc4+ #32 [ 62.542202][ T8516] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.552242][ T8516] Call Trace: [ 62.555519][ T8516] dump_stack+0x172/0x1f0 [ 62.559870][ T8516] ? perf_reg_value+0x20/0x110 [ 62.564633][ T8516] panic+0x2cb/0x744 [ 62.568508][ T8516] ? __warn_printk+0xf3/0xf3 [ 62.573075][ T8516] ? perf_reg_value+0xdb/0x110 [ 62.577815][ T8516] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 62.584036][ T8516] ? __warn.cold+0x5/0x4d [ 62.588347][ T8516] ? __warn+0xe8/0x1d0 [ 62.592396][ T8516] ? perf_reg_value+0xdb/0x110 [ 62.597134][ T8516] __warn.cold+0x20/0x4d [ 62.601352][ T8516] ? perf_reg_value+0xdb/0x110 [ 62.606096][ T8516] report_bug+0x263/0x2b0 [ 62.610407][ T8516] do_error_trap+0x11b/0x200 [ 62.614975][ T8516] do_invalid_op+0x37/0x50 [ 62.619368][ T8516] ? perf_reg_value+0xdb/0x110 [ 62.624113][ T8516] invalid_op+0x14/0x20 [ 62.628248][ T8516] RIP: 0010:perf_reg_value+0xdb/0x110 [ 62.633597][ T8516] Code: a0 00 00 00 77 26 48 b8 00 00 00 00 00 fc ff df 48 01 fb 48 89 da 48 c1 ea 03 80 3c 02 00 75 34 48 8b 03 48 83 c4 08 5b 5d c3 <0f> 0b 48 83 c4 08 31 c0 5b 5d c3 89 75 f0 e8 72 d6 78 00 8b 75 f0 [ 62.653180][ T8516] RSP: 0018:ffff88809674f2b8 EFLAGS: 00010202 [ 62.659230][ T8516] RAX: 00000000fffffff9 RBX: ffff88809674fa68 RCX: ffffffff81855a4e [ 62.667180][ T8516] RDX: 0000000000000000 RSI: 0000000000000019 RDI: ffff88809674fa68 [ 62.675133][ T8516] RBP: ffff88809674f2c8 R08: ffff888092eda5c0 R09: ffffed1012f92ebb [ 62.683106][ T8516] R10: ffffed1012f92eba R11: ffff888097c975d7 R12: ffff88809674f320 [ 62.691070][ T8516] R13: ffff88809674f508 R14: ffff88809674fa68 R15: ffff88809674f700 [ 62.699040][ T8516] ? perf_output_sample_regs+0xae/0x160 [ 62.704584][ T8516] perf_output_sample_regs+0xca/0x160 [ 62.709932][ T8516] ? rb_free_rcu+0x20/0x20 [ 62.714324][ T8516] ? memcpy+0x46/0x50 [ 62.718282][ T8516] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 62.723982][ T8516] perf_output_sample+0x15c2/0x1a90 [ 62.729162][ T8516] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 62.735381][ T8516] ? perf_prepare_sample+0x829/0x1520 [ 62.740732][ T8516] ? retint_kernel+0x2b/0x2b [ 62.745300][ T8516] ? perf_event__output_id_sample+0x90/0x90 [ 62.751169][ T8516] ? perf_event_output_forward+0x125/0x290 [ 62.756951][ T8516] perf_event_output_forward+0x150/0x290 [ 62.762562][ T8516] ? perf_prepare_sample+0x1520/0x1520 [ 62.768017][ T8516] ? mark_held_locks+0xf0/0xf0 [ 62.772777][ T8516] ? __this_cpu_preempt_check+0x3a/0x270 [ 62.778404][ T8516] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 62.784624][ T8516] ? __perf_event_account_interrupt+0x100/0x2e0 [ 62.790842][ T8516] __perf_event_overflow+0x141/0x370 [ 62.796106][ T8516] perf_swevent_overflow+0xaa/0x140 [ 62.801295][ T8516] perf_swevent_event+0x1f7/0x2f0 [ 62.806299][ T8516] ___perf_sw_event+0x31c/0x570 [ 62.811128][ T8516] ? __handle_mm_fault+0x21b2/0x3eb0 [ 62.816391][ T8516] ? perf_pending_event+0x190/0x190 [ 62.821584][ T8516] ? __handle_mm_fault+0x21b2/0x3eb0 [ 62.826857][ T8516] ? copy_user_enhanced_fast_string+0xe/0x20 [ 62.832830][ T8516] ? lock_downgrade+0x880/0x880 [ 62.837660][ T8516] ? migration_entry_to_page+0x320/0x320 [ 62.843274][ T8516] ? kasan_check_read+0x11/0x20 [ 62.848101][ T8516] ? do_raw_spin_unlock+0x57/0x270 [ 62.853275][ T8516] ? _raw_spin_unlock+0x2d/0x50 [ 62.858102][ T8516] ? __handle_mm_fault+0x7cb/0x3eb0 [ 62.863283][ T8516] ? __do_page_fault+0x623/0xda0 [ 62.868197][ T8516] ? find_held_lock+0x35/0x130 [ 62.872942][ T8516] ? __do_page_fault+0x623/0xda0 [ 62.877959][ T8516] ? lock_downgrade+0x880/0x880 [ 62.882796][ T8516] __perf_sw_event+0x51/0xa0 [ 62.887366][ T8516] ? perf_swevent_get_recursion_context+0x120/0x170 [ 62.893929][ T8516] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 62.900146][ T8516] ? __perf_sw_event+0x51/0xa0 [ 62.904888][ T8516] __do_page_fault+0x747/0xda0 [ 62.909630][ T8516] do_page_fault+0x71/0x57d [ 62.914112][ T8516] page_fault+0x1e/0x30 [ 62.918248][ T8516] RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 [ 62.924819][ T8516] Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 1f 00 c3 0f 1f 80 00 00 00 00 0f 1f 00 83 fa 40 0f 82 70 ff ff ff 89 d1 a4 31 c0 0f 1f 00 c3 66 2e 0f 1f 84 00 00 00 00 00 89 d1 f3 a4 [ 62.944410][ T8516] RSP: 0018:ffff88809674fb10 EFLAGS: 00010206 [ 62.950464][ T8516] RAX: 0000000000000000 RBX: 0000000000001000 RCX: 00000000000001c0 [ 62.958414][ T8516] RDX: 0000000000001000 RSI: 0000000020001000 RDI: ffff888099b30e40 [ 62.966377][ T8516] RBP: ffff88809674fb48 R08: ffffed1013366200 R09: 0000000000000000 [ 62.974327][ T8516] R10: ffffed10133661ff R11: ffff888099b30fff R12: 00000000200001c0 [ 62.982275][ T8516] R13: ffff888099b30000 R14: 00000000200011c0 R15: 00007ffffffff000 [ 62.990259][ T8516] ? copyin+0xe2/0x100 [ 62.994307][ T8516] copy_page_from_iter+0x3ad/0x7d0 [ 62.999399][ T8516] pipe_write+0x281/0xf30 [ 63.003714][ T8516] new_sync_write+0x4d3/0x770 [ 63.008366][ T8516] ? new_sync_read+0x800/0x800 [ 63.013132][ T8516] ? retint_kernel+0x2b/0x2b [ 63.017706][ T8516] ? __vfs_write+0x22/0x110 [ 63.022190][ T8516] __vfs_write+0xe1/0x110 [ 63.026501][ T8516] vfs_write+0x20c/0x580 [ 63.030742][ T8516] ksys_write+0x14f/0x290 [ 63.035051][ T8516] ? __ia32_sys_read+0xb0/0xb0 [ 63.039792][ T8516] ? do_syscall_64+0x26/0x680 [ 63.044449][ T8516] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 63.050492][ T8516] ? do_syscall_64+0x26/0x680 [ 63.055169][ T8516] __x64_sys_write+0x73/0xb0 [ 63.059744][ T8516] do_syscall_64+0xfd/0x680 [ 63.064244][ T8516] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 63.070115][ T8516] RIP: 0033:0x440529 [ 63.074009][ T8516] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 63.093593][ T8516] RSP: 002b:00007ffe36867c38 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 63.101995][ T8516] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440529 [ 63.109948][ T8516] RDX: 000000010000026f RSI: 00000000200001c0 RDI: 0000000000000007 [ 63.118085][ T8516] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 63.126035][ T8516] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401db0 [ 63.133983][ T8516] R13: 0000000000401e40 R14: 0000000000000000 R15: 0000000000000000 [ 63.143198][ T8516] Kernel Offset: disabled [ 63.147575][ T8516] Rebooting in 86400 seconds..