INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 'ci-upstream-kasan-gce-386-1,10.128.15.204' (ECDSA) to the list of known hosts. 2017/11/06 02:07:03 parsed 1 programs 2017/11/06 02:07:03 executed programs: 0 syzkaller login: [ 63.283939] ------------[ cut here ]------------ [ 63.284700] WARNING: CPU: 0 PID: 1 at kernel/signal.c:340 task_participate_group_stop+0x1ce/0x230 [ 63.285878] Kernel panic - not syncing: panic_on_warn set ... [ 63.285878] [ 63.286844] CPU: 0 PID: 1 Comm: init Not tainted 4.14.0-rc7+ #73 [ 63.287697] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.288914] Call Trace: [ 63.289271] dump_stack+0x194/0x257 [ 63.289762] ? arch_local_irq_restore+0x53/0x53 [ 63.290394] panic+0x1e4/0x417 [ 63.290827] ? __warn+0x1d9/0x1d9 [ 63.291291] ? show_regs_print_info+0x65/0x65 [ 63.291903] ? task_participate_group_stop+0x1ce/0x230 [ 63.292600] __warn+0x1c4/0x1d9 [ 63.293065] ? task_participate_group_stop+0x1ce/0x230 [ 63.293766] report_bug+0x211/0x2d0 [ 63.294262] fixup_bug+0x40/0x90 [ 63.294720] do_trap+0x260/0x390 [ 63.295182] do_error_trap+0x120/0x390 [ 63.295704] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 63.296383] ? do_trap+0x390/0x390 [ 63.296890] ? task_participate_group_stop+0x1ce/0x230 [ 63.297597] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 63.298247] do_invalid_op+0x1b/0x20 [ 63.298746] invalid_op+0x18/0x20 [ 63.299215] RIP: 0010:task_participate_group_stop+0x1ce/0x230 [ 63.299990] RSP: 0018:ffff8801d9edf8b8 EFLAGS: 00010097 [ 63.300714] RAX: ffff8801d9ed4040 RBX: ffff8801d9ed4040 RCX: 0000000000000012 [ 63.301668] RDX: 0000000000000000 RSI: 0000000000060013 RDI: ffff8801d9ed44d0 [ 63.302641] RBP: ffff8801d9edf8d0 R08: ffffffff814392fc R09: 000000000000000c [ 63.303630] R10: ffff8801d9edf7b0 R11: 0000000000000000 R12: ffff8801d9ee1740 [ 63.308086] R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8801d9ed45c8 [ 63.315335] ? ptrace_stop+0x5bc/0xa40 [ 63.319194] ? task_participate_group_stop+0x1ce/0x230 [ 63.324436] ? do_signal_stop+0x486/0x910 [ 63.328550] do_signal_stop+0x217/0x910 [ 63.332496] ? ptrace_do_notify+0x310/0x310 [ 63.336786] ? __lock_is_held+0xb6/0x140 [ 63.340824] get_signal+0x55a/0x16d0 [ 63.344513] ? ptrace_notify+0x130/0x130 [ 63.348549] ? poll_select_copy_remaining+0x160/0x6e0 [ 63.353709] ? lock_downgrade+0x990/0x990 [ 63.357825] ? find_held_lock+0x35/0x1d0 [ 63.361867] do_signal+0x94/0x1ee0 [ 63.365376] ? lock_release+0xa40/0xa40 [ 63.369319] ? check_same_owner+0x320/0x320 [ 63.373608] ? ktime_get_ts64+0x328/0x4d0 [ 63.377729] ? setup_sigcontext+0x7d0/0x7d0 [ 63.382016] ? __might_sleep+0x95/0x190 [ 63.385965] ? kasan_check_read+0x11/0x20 [ 63.390077] ? _copy_to_user+0xa2/0xc0 [ 63.393933] ? poll_select_copy_remaining+0x3ef/0x6e0 [ 63.399091] ? poll_schedule_timeout+0x1f0/0x1f0 [ 63.403815] ? exit_to_usermode_loop+0x8c/0x310 [ 63.408455] exit_to_usermode_loop+0x214/0x310 [ 63.413003] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 63.418505] ? kasan_check_write+0x14/0x20 [ 63.422711] syscall_return_slowpath+0x42f/0x510 [ 63.427434] ? prepare_exit_to_usermode+0x2d0/0x2d0 [ 63.432420] ? entry_SYSCALL_64_fastpath+0x91/0xbe [ 63.437316] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 63.442298] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 63.447024] entry_SYSCALL_64_fastpath+0xbc/0xbe [ 63.451747] RIP: 0033:0x7f8521ce2dd3 [ 63.455424] RSP: 002b:00007ffcd92023c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000017 [ 63.463095] RAX: fffffffffffffdfe RBX: 00007ffcd9202570 RCX: 00007f8521ce2dd3 [ 63.470331] RDX: 0000000000000000 RSI: 00007ffcd9202720 RDI: 000000000000000b [ 63.477566] RBP: 00007ffcd9202720 R08: 00007ffcd92027a0 R09: 0000000000000001 [ 63.484819] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 63.492055] R13: 00007ffcd9202b00 R14: 0000000000000000 R15: 0000000000000000 [ 63.499442] Dumping ftrace buffer: [ 63.502997] (ftrace buffer empty) [ 63.506676] Kernel Offset: disabled [ 63.510274] Rebooting in 86400 seconds..