[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.67' (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 syzkaller login: [ 37.284169] WARNING: CPU: 1 PID: 8200 at kernel/signal.c:372 task_participate_group_stop+0x29e/0x300 [ 37.293803] Kernel panic - not syncing: panic_on_warn set ... [ 37.293803] [ 37.301193] CPU: 1 PID: 8200 Comm: 4 Not tainted 4.19.169-syzkaller #0 [ 37.307839] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.317193] Call Trace: [ 37.319780] dump_stack+0x1fc/0x2ef [ 37.323394] panic+0x26a/0x50e [ 37.326574] ? __warn_printk+0xf3/0xf3 [ 37.330462] ? task_participate_group_stop+0x29e/0x300 [ 37.335724] ? __probe_kernel_read+0x130/0x1b0 [ 37.340314] ? __warn.cold+0x5/0x5a [ 37.343947] ? __warn+0xe4/0x200 [ 37.347312] ? task_participate_group_stop+0x29e/0x300 [ 37.352590] __warn.cold+0x20/0x5a [ 37.356149] ? task_participate_group_stop+0x29e/0x300 [ 37.361431] report_bug+0x262/0x2b0 [ 37.365061] do_error_trap+0x1d7/0x310 [ 37.368956] ? math_error+0x310/0x310 [ 37.372757] ? check_preemption_disabled+0x41/0x280 [ 37.377774] ? error_entry+0x72/0xd0 [ 37.381580] ? trace_hardirqs_off_caller+0x2c/0x210 [ 37.386599] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.391876] invalid_op+0x14/0x20 [ 37.395345] RIP: 0010:task_participate_group_stop+0x29e/0x300 [ 37.401230] Code: 00 f0 83 44 24 fc 00 be 15 00 00 00 4c 89 ef e8 08 07 0e 00 e9 4c fe ff ff e8 de 70 27 00 0f 0b e9 f2 fd ff ff e8 d2 70 27 00 <0f> 0b e9 a3 fe ff ff 48 89 ef e8 23 26 5d 00 e9 6d fe ff ff 48 89 [ 37.420225] RSP: 0018:ffff8880b0597bd0 EFLAGS: 00010093 [ 37.426255] RAX: ffff8880affe0080 RBX: 0000000000000000 RCX: ffffffff813ae810 [ 37.433544] RDX: 0000000000000000 RSI: ffffffff813ae97e RDI: 0000000000000005 [ 37.440985] RBP: ffff8880b5336660 R08: 0000000000000001 R09: 0000000000000000 [ 37.448275] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880b53365c0 [ 37.455562] R13: ffff8880affe0500 R14: 0000000000040000 R15: 0000000000000000 [ 37.462842] ? task_participate_group_stop+0x130/0x300 [ 37.468135] ? task_participate_group_stop+0x29e/0x300 [ 37.473429] do_signal_stop+0x1f1/0x860 [ 37.477594] get_signal+0xf17/0x1f70 [ 37.481312] ? check_preemption_disabled+0x41/0x280 [ 37.486347] do_signal+0x8f/0x1670 [ 37.489898] ? setup_sigcontext+0x820/0x820 [ 37.494251] ? __do_execve_file+0x2ba/0x2360 [ 37.498673] ? open_exec+0x70/0x70 [ 37.502224] ? check_preemption_disabled+0x41/0x280 [ 37.507251] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 37.512537] ? __phys_addr+0x9a/0x110 [ 37.516360] ? __check_object_size+0x17b/0x3e0 [ 37.520957] ? exit_to_usermode_loop+0x36/0x2a0 [ 37.525631] exit_to_usermode_loop+0x204/0x2a0 [ 37.530482] do_syscall_64+0x538/0x620 [ 37.534364] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.539552] RIP: 0023:0xb7000000 [ 37.542949] Code: Bad RIP value. [ 37.546308] RSP: 002b:00000000ffc62f20 EFLAGS: 00000200 ORIG_RAX: 000000000000000b [ 37.554021] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 37.561560] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 37.568857] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 37.576382] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 37.583758] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 37.592789] Kernel Offset: disabled [ 37.596481] Rebooting in 86400 seconds..