WARNING: CPU: 0 PID: 9142 at kernel/fork.c:677 __mmdrop+0x26a/0x320 /kernel/fork.c:677 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 9142 Comm: syz-executor.0 Not tainted 5.2.0-next-20190718 #41 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack /lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 /lib/dump_stack.c:113 panic+0x2dc/0x755 /kernel/panic.c:219 __warn.cold+0x20/0x4c /kernel/panic.c:576 report_bug+0x263/0x2b0 /lib/bug.c:186 fixup_bug /arch/x86/kernel/traps.c:179 [inline] fixup_bug /arch/x86/kernel/traps.c:174 [inline] do_error_trap+0x11b/0x200 /arch/x86/kernel/traps.c:272 do_invalid_op+0x37/0x50 /arch/x86/kernel/traps.c:291 invalid_op+0x14/0x20 /arch/x86/entry/entry_64.S:1008 RIP: 0010:__mmdrop+0x26a/0x320 /kernel/fork.c:677 Code: 5f 5d c3 e8 18 7e 2f 00 4c 89 ef e8 60 d7 2b 00 eb d2 e8 09 7e 2f 00 0f 0b e8 02 7e 2f 00 0f 0b e9 fa fd ff ff e8 f6 7d 2f 00 <0f> 0b e9 2b fe ff ff e8 ea 7d 2f 00 4c 89 e7 e8 a2 f7 67 00 e9 85 RSP: 0018:ffff8880a176fac0 EFLAGS: 00010293 RAX: ffff888098f02600 RBX: ffff888098f02600 RCX: ffffffff81430bab RDX: 0000000000000000 RSI: ffffffff814306fa RDI: ffff888098f02a30 RBP: ffff8880a176fae8 R08: ffff888098f02600 R09: ffffed10148dd4ec R10: ffffed10148dd4eb R11: ffff8880a46ea75f R12: ffff8880a46ea700 R13: ffff8880a46ea828 R14: ffff8880a46eac50 R15: 0000000000000000 mmdrop /./include/linux/sched/mm.h:49 [inline] __mmput /kernel/fork.c:1074 [inline] mmput+0x3f0/0x4d0 /kernel/fork.c:1085 exit_mm /kernel/exit.c:547 [inline] do_exit+0x84e/0x2ea0 /kernel/exit.c:864 do_group_exit+0x135/0x360 /kernel/exit.c:981 get_signal+0x47c/0x2500 /kernel/signal.c:2728 do_signal+0x87/0x1700 /arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x286/0x380 /arch/x86/entry/common.c:159 prepare_exit_to_usermode /arch/x86/entry/common.c:194 [inline] syscall_return_slowpath /arch/x86/entry/common.c:274 [inline] do_syscall_64+0x5a9/0x6a0 /arch/x86/entry/common.c:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459819 Code: Bad RIP value. RSP: 002b:00007f75afccbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000459819 RDX: 00000000200023c0 RSI: 000000004028af11 RDI: 0000000000000003 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f75afccc6d4 R13: 00000000004c4722 R14: 00000000004d87d0 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..