WARNING: CPU: 1 PID: 12602 at kernel/fork.c:677 __mmdrop+0x26a/0x320 kernel/fork.c:677
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 12602 Comm: syz-executor.0 Not tainted 5.2.0-rc6-next-20190626 #23
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:986
RIP: 0010:__mmdrop+0x26a/0x320 kernel/fork.c:677
Code: 5f 5d c3 e8 38 6d 2f 00 4c 89 ef e8 70 c6 2b 00 eb d2 e8 29 6d 2f 00 0f 0b e8 22 6d 2f 00 0f 0b e9 fa fd ff ff e8 16 6d 2f 00 <0f> 0b e9 2b fe ff ff e8 0a 6d 2f 00 4c 89 e7 e8 a2 98 67 00 e9 85
RSP: 0018:ffff888070597ac0 EFLAGS: 00010293
RAX: ffff88809bd280c0 RBX: ffff88809bd280c0 RCX: ffffffff8142f58b
RDX: 0000000000000000 RSI: ffffffff8142f0da RDI: ffff88809bd284f0
RBP: ffff888070597ae8 R08: ffff88809bd280c0 R09: ffffed100e8f021c
R10: ffffed100e8f021b R11: ffff8880747810df R12: ffff888074781080
R13: ffff8880747811a8 R14: ffff8880747815d0 R15: 0000000000000000
 mmdrop include/linux/sched/mm.h:49 [inline]
 __mmput kernel/fork.c:1075 [inline]
 mmput+0x3f0/0x4d0 kernel/fork.c:1086
 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+0x251/0x2d0 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:279 [inline]
 do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459519
Code: Bad RIP value.
RSP: 002b:00007f085d714c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffff2 RBX: 0000000000000003 RCX: 0000000000459519
RDX: 0000000000000000 RSI: 000000004008af03 RDI: 0000000000000004
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f085d7156d4
R13: 00000000004c4389 R14: 00000000004d8300 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..