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-5,10.128.0.3' (ECDSA) to the list of known hosts. 2017/11/14 03:47:45 parsed 1 programs 2017/11/14 03:47:45 executed programs: 0 syzkaller login: [ 35.285964] ------------[ cut here ]------------ [ 35.286783] WARNING: CPU: 0 PID: 3050 at kernel/signal.c:340 task_participate_group_stop+0x1ce/0x230 [ 35.288041] Kernel panic - not syncing: panic_on_warn set ... [ 35.288041] [ 35.289029] CPU: 0 PID: 3050 Comm: syz-executor0 Not tainted 4.14.0+ #176 [ 35.289938] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.291183] Call Trace: [ 35.291547] dump_stack+0x194/0x257 [ 35.292054] ? arch_local_irq_restore+0x53/0x53 [ 35.292687] panic+0x1e4/0x41c [ 35.293121] ? refcount_error_report+0x214/0x214 [ 35.293757] ? show_regs_print_info+0x65/0x65 [ 35.294369] ? task_participate_group_stop+0x1ce/0x230 [ 35.295069] __warn+0x1c4/0x1e0 [ 35.295513] ? task_participate_group_stop+0x1ce/0x230 [ 35.296216] report_bug+0x211/0x2d0 [ 35.296713] fixup_bug.part.12+0x37/0x80 [ 35.297287] do_error_trap+0x2d7/0x3e0 [ 35.297810] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 35.298493] ? math_error+0x400/0x400 [ 35.299003] ? find_held_lock+0x39/0x1d0 [ 35.299560] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.300212] do_invalid_op+0x1b/0x20 [ 35.300711] invalid_op+0x18/0x20 [ 35.301178] RIP: 0010:task_participate_group_stop+0x1ce/0x230 [ 35.301965] RSP: 0018:ffff8801cd3ef8c8 EFLAGS: 00010097 [ 35.302677] RAX: ffff8801cde26440 RBX: ffff8801cde26440 RCX: 0000000000000012 [ 35.303658] RDX: 0000000000000000 RSI: 0000000000060013 RDI: ffff8801cde268c0 [ 35.304609] RBP: ffff8801cd3ef8e0 R08: 0000000000000000 R09: 0000000000000000 [ 35.305584] R10: 0000000000000001 R11: ffffffff87264d20 R12: ffff8801d2ae21c0 [ 35.309367] R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8801cde269b8 [ 35.316625] ? task_participate_group_stop+0x1ce/0x230 [ 35.321876] ? do_signal_stop+0x489/0x910 [ 35.325993] do_signal_stop+0x217/0x910 [ 35.329940] ? ptrace_do_notify+0x310/0x310 [ 35.334230] ? __lock_is_held+0xbc/0x140 [ 35.338273] get_signal+0x55a/0x16c0 [ 35.341970] ? ptrace_notify+0x130/0x130 [ 35.345998] ? trace_hardirqs_on+0xd/0x10 [ 35.350126] ? hrtimer_try_to_cancel+0x9a/0x5c0 [ 35.354764] ? __hrtimer_get_remaining+0x1c0/0x1c0 [ 35.359667] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 35.365518] ? rcu_note_context_switch+0x710/0x710 [ 35.370417] do_signal+0x94/0x1ee0 [ 35.373929] ? do_nanosleep+0x4fc/0x6e0 [ 35.377876] ? setup_sigcontext+0x7d0/0x7d0 [ 35.382175] ? rcu_pm_notify+0xc0/0xc0 [ 35.386035] ? memset+0x31/0x40 [ 35.389301] ? hrtimer_nanosleep+0x2cc/0x860 [ 35.393677] ? SyS_waitid+0x50/0x50 [ 35.397276] ? exit_to_usermode_loop+0x8c/0x310 [ 35.401916] exit_to_usermode_loop+0x214/0x310 [ 35.406464] ? kasan_check_write+0x14/0x20 [ 35.410666] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 35.416173] ? __hrtimer_init+0x140/0x140 [ 35.420298] syscall_return_slowpath+0x490/0x550 [ 35.425020] ? prepare_exit_to_usermode+0x340/0x340 [ 35.430004] ? entry_SYSCALL_64_fastpath+0x69/0x96 [ 35.434903] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 35.439885] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 35.444612] entry_SYSCALL_64_fastpath+0x94/0x96 [ 35.449332] RIP: 0033:0x47dec0 [ 35.452489] RSP: 002b:0000000000a6fa08 EFLAGS: 00000246 ORIG_RAX: 0000000000000023 [ 35.460163] RAX: fffffffffffffdfc RBX: 0000000001839914 RCX: 000000000047dec0 [ 35.467399] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000a6fa10 [ 35.474895] RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000001839940 [ 35.482140] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 35.489375] R13: 0000000000000007 R14: 00000000000089ba R15: 0000000000000016