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-mmots-kasan-gce-6,10.128.0.24' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 40.832153] ------------[ cut here ]------------ [ 40.832928] WARNING: CPU: 0 PID: 1 at kernel/signal.c:340 task_participate_group_stop+0x1ce/0x230 [ 40.834200] Kernel panic - not syncing: panic_on_warn set ... [ 40.834200] [ 40.835216] CPU: 0 PID: 1 Comm: init Not tainted 4.13.0-mm1+ #5 [ 40.836018] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.837239] Call Trace: [ 40.837639] dump_stack+0x194/0x257 [ 40.838162] ? arch_local_irq_restore+0x53/0x53 [ 40.838831] panic+0x1e4/0x417 [ 40.839268] ? __warn+0x1d9/0x1d9 [ 40.839737] ? show_regs_print_info+0x65/0x65 [ 40.840445] ? task_participate_group_stop+0x1ce/0x230 [ 40.841196] __warn+0x1c4/0x1d9 [ 40.841666] ? task_participate_group_stop+0x1ce/0x230 [ 40.842405] report_bug+0x211/0x2d0 [ 40.842994] fixup_bug+0x40/0x90 [ 40.843540] do_trap+0x260/0x390 [ 40.844095] do_error_trap+0x120/0x390 [ 40.844671] ? do_trap+0x390/0x390 [ 40.845166] ? task_participate_group_stop+0x1ce/0x230 [ 40.845879] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.846591] do_invalid_op+0x1b/0x20 [ 40.847094] invalid_op+0x18/0x20 [ 40.847565] RIP: 0010:task_participate_group_stop+0x1ce/0x230 [ 40.848344] RSP: 0018:ffff8801d9ee77f0 EFLAGS: 00010097 [ 40.849060] RAX: ffff8801d9ed8040 RBX: ffff8801d9ed8040 RCX: ffff8801d9edb2c0 [ 40.850014] RDX: 0000000000000000 RSI: 0000000000060013 RDI: ffff8801d9ed84d0 [ 40.850969] RBP: ffff8801d9ee7808 R08: ffff8801d9ee7180 R09: ffff8801d9ee7178 [ 40.851922] R10: ffff8801d9ee70f0 R11: 1ffff1003b3db29b R12: ffff8801d9ee9740 [ 40.852877] R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8801d9ed85c8 [ 40.860155] ? do_signal_stop+0x486/0x900 [ 40.864287] do_signal_stop+0x217/0x900 [ 40.868255] ? ptrace_do_notify+0x310/0x310 [ 40.872563] ? __lock_is_held+0xbc/0x140 [ 40.876609] get_signal+0x61c/0x17e0 [ 40.880333] ? ptrace_notify+0x130/0x130 [ 40.884372] ? lock_downgrade+0x990/0x990 [ 40.888498] ? find_held_lock+0x39/0x1d0 [ 40.892541] ? lock_downgrade+0x990/0x990 [ 40.896671] do_signal+0x94/0x1ee0 [ 40.900188] ? __might_fault+0xe0/0x1d0 [ 40.904143] ? setup_sigcontext+0x7d0/0x7d0 [ 40.908445] ? __might_sleep+0x95/0x190 [ 40.912404] ? kasan_check_read+0x11/0x20 [ 40.916525] ? _copy_to_user+0xa2/0xc0 [ 40.920396] ? poll_select_copy_remaining+0x38f/0x620 [ 40.925567] ? exit_to_usermode_loop+0x98/0x300 [ 40.930218] exit_to_usermode_loop+0x224/0x300 [ 40.934771] ? poll_select_set_timeout+0x12f/0x210 [ 40.939676] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 40.945191] ? kasan_check_write+0x14/0x20 [ 40.949406] syscall_return_slowpath+0x42f/0x500 [ 40.954140] ? prepare_exit_to_usermode+0x2c0/0x2c0 [ 40.959133] ? entry_SYSCALL_64_fastpath+0x91/0xbe [ 40.964049] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 40.969053] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 40.973792] entry_SYSCALL_64_fastpath+0xbc/0xbe [ 40.978520] RIP: 0033:0x7f33f723fdd3 [ 40.982204] RSP: 002b:00007fffb5303398 EFLAGS: 00000246 ORIG_RAX: 0000000000000017 [ 40.989888] RAX: fffffffffffffdfe RBX: 00007fffb5303540 RCX: 00007f33f723fdd3 [ 40.997128] RDX: 0000000000000000 RSI: 00007fffb53036f0 RDI: 000000000000000b [ 41.004369] RBP: 00007fffb53036f0 R08: 00007fffb5303770 R09: 0000000000000001 [ 41.011608] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 41.018851] R13: 00007fffb5303ad0 R14: 0000000000000000 R15: 0000000000000000