Debian GNU/Linux 7 syzkaller ttyS0 2017/10/28 10:16:01 parsed 1 programs 2017/10/28 10:16:01 executed programs: 0 syzkaller login: [ 15.060027] ------------[ cut here ]------------ [ 15.060555] WARNING: CPU: 0 PID: 1 at kernel/signal.c:340 task_participate_group_stop+0x1ce/0x230 [ 15.061455] Kernel panic - not syncing: panic_on_warn set ... [ 15.061455] [ 15.062223] CPU: 0 PID: 1 Comm: init Not tainted 4.14.0-rc5-next-20171018+ #8 [ 15.062967] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 15.063832] Call Trace: [ 15.064108] dump_stack+0x194/0x257 [ 15.064482] ? arch_local_irq_restore+0x53/0x53 [ 15.064974] ? vsnprintf+0x1ed/0x1900 [ 15.065381] panic+0x1e4/0x41c [ 15.065719] ? refcount_error_report+0x214/0x214 [ 15.067485] ? show_regs_print_info+0x65/0x65 [ 15.067955] ? __warn+0x1a9/0x1e0 [ 15.068314] ? task_participate_group_stop+0x1ce/0x230 [ 15.068851] __warn+0x1c4/0x1e0 [ 15.069178] ? task_participate_group_stop+0x1ce/0x230 [ 15.069709] report_bug+0x211/0x2d0 [ 15.070092] fixup_bug+0x40/0x90 [ 15.070435] do_trap+0x260/0x390 [ 15.070781] do_error_trap+0x120/0x390 [ 15.071165] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 15.071668] ? do_trap+0x390/0x390 [ 15.072026] ? task_participate_group_stop+0x1ce/0x230 [ 15.072554] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 15.073048] do_invalid_op+0x1b/0x20 [ 15.073415] invalid_op+0x18/0x20 [ 15.073760] RIP: 0010:task_participate_group_stop+0x1ce/0x230 [ 15.079547] RSP: 0018:ffff88003eb978b8 EFLAGS: 00010093 [ 15.080035] RAX: ffff88003eb8e040 RBX: ffff88003eb8e040 RCX: ffffffff8143bece [ 15.080670] RDX: 0000000000000000 RSI: 0000000000060013 RDI: ffff88003eb8e4c0 [ 15.081311] RBP: ffff88003eb978d0 R08: ffffffff81441adc R09: 000000000000000c [ 15.081946] R10: ffff88003eb977b0 R11: 0000000000000000 R12: ffff88006da9c040 [ 15.082641] R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88003eb8e5b8 [ 15.083350] ? ptrace_stop+0x5bc/0xa40 [ 15.083731] ? task_participate_group_stop+0x1ce/0x230 [ 15.084264] ? task_participate_group_stop+0x1ce/0x230 [ 15.084768] ? do_signal_stop+0x486/0x910 [ 15.085156] do_signal_stop+0x217/0x910 [ 15.085553] ? ptrace_do_notify+0x310/0x310 [ 15.085989] ? __lock_is_held+0xb6/0x140 [ 15.086693] get_signal+0x55a/0x16d0 [ 15.087067] ? ptrace_notify+0x130/0x130 [ 15.087468] ? find_held_lock+0x35/0x1d0 [ 15.087871] ? poll_select_copy_remaining+0x152/0x620 [ 15.088358] ? lock_downgrade+0x990/0x990 [ 15.088757] ? find_held_lock+0x35/0x1d0 [ 15.089159] do_signal+0x94/0x1ee0 [ 15.089491] ? __might_fault+0x110/0x1d0 [ 15.089878] ? lock_downgrade+0x990/0x990 [ 15.090252] ? lock_release+0xa40/0xa40 [ 15.090548] ? setup_sigcontext+0x7d0/0x7d0 [ 15.090989] ? __might_sleep+0x95/0x190 [ 15.091391] ? _copy_to_user+0xa2/0xc0 [ 15.091769] ? poll_select_copy_remaining+0x38f/0x620 [ 15.092284] ? exit_to_usermode_loop+0x8c/0x310 [ 15.092752] exit_to_usermode_loop+0x214/0x310 [ 15.093191] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 15.093743] ? kasan_check_write+0x14/0x20 [ 15.094190] syscall_return_slowpath+0x42f/0x510 [ 15.094669] ? prepare_exit_to_usermode+0x2d0/0x2d0 [ 15.095125] ? entry_SYSCALL_64_fastpath+0x91/0xbe [ 15.095603] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 15.096051] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 15.096479] entry_SYSCALL_64_fastpath+0xbc/0xbe [ 15.096896] RIP: 0033:0x7f2bf28cbdd3 [ 15.097224] RSP: 002b:00007ffc72bfd4c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000017 [ 15.097954] RAX: fffffffffffffdfe RBX: 00007ffc72bfd670 RCX: 00007f2bf28cbdd3 [ 15.098592] RDX: 0000000000000000 RSI: 00007ffc72bfd820 RDI: 000000000000000b [ 15.099274] RBP: 00007ffc72bfd820 R08: 00007ffc72bfd8a0 R09: 0000000000000001 [ 15.099906] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 15.100543] R13: 00007ffc72bfdc00 R14: 0000000000000000 R15: 0000000000000000 [ 15.102167] Dumping ftrace buffer: [ 15.102574] (ftrace buffer empty) [ 15.102903] Kernel Offset: disabled [ 15.103230] Rebooting in 86400 seconds..