kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 15474 Comm: syz-executor.2 Not tainted 4.19.208-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:777 [inline]
RIP: 0010:debug_check_no_obj_freed+0x1c9/0x490 lib/debugobjects.c:817
Code: 48 b8 00 01 00 00 00 00 ad de 4d 89 60 08 4c 89 c7 49 89 00 e8 a8 d6 ff ff 09 c3 4d 85 f6 74 2c 4d 89 f0 4c 89 c0 48 c1 e8 03 <42> 80 3c 38 00 0f 84 23 ff ff ff 4c 89 c7 4c 89 44 24 38 e8 bf 19
RSP: 0018:ffff88817e997898 EFLAGS: 00010802
RAX: 1e001fea7e001fea RBX: 0000000000000000 RCX: ffffffff814bddcb
RDX: 1ffffffff1a87883 RSI: 0000000000000004 RDI: ffff888000000018
RBP: 0000000000000005 R08: f000ff53f000ff53 R09: f000ff53f000ff53
R10: ffffffff8d43c40b R11: 0000000000000000 R12: dead000000000200
R13: ffff88804c87c250 R14: f000ff53f000ff53 R15: dffffc0000000000
FS:  00007fad3eae1700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f325b0e2000 CR3: 000000009e765000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kmem_cache_free+0xff/0x260 mm/slab.c:3764
 remove_vma+0x132/0x170 mm/mmap.c:180
 exit_mmap+0x359/0x530 mm/mmap.c:3104
 __mmput kernel/fork.c:1016 [inline]
 mmput+0x14e/0x4a0 kernel/fork.c:1037
 exit_mm kernel/exit.c:549 [inline]
 do_exit+0xaec/0x2be0 kernel/exit.c:857
 do_group_exit+0x125/0x310 kernel/exit.c:967
 get_signal+0x3f2/0x1f70 kernel/signal.c:2589
 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799
 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fad4158b709
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fad3eae1188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 0000000000000048 RBX: 00007fad41690020 RCX: 00007fad4158b709
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 00007fad415e5cb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffca04c393f R14: 00007fad3eae1300 R15: 0000000000022000
Modules linked in:

======================================================
----------------
Code disassembly (best guess):
   0:	48 b8 00 01 00 00 00 	movabs $0xdead000000000100,%rax
   7:	00 ad de
   a:	4d 89 60 08          	mov    %r12,0x8(%r8)
   e:	4c 89 c7             	mov    %r8,%rdi
  11:	49 89 00             	mov    %rax,(%r8)
  14:	e8 a8 d6 ff ff       	callq  0xffffd6c1
  19:	09 c3                	or     %eax,%ebx
  1b:	4d 85 f6             	test   %r14,%r14
  1e:	74 2c                	je     0x4c
  20:	4d 89 f0             	mov    %r14,%r8
  23:	4c 89 c0             	mov    %r8,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	0f 84 23 ff ff ff    	je     0xffffff58
  35:	4c 89 c7             	mov    %r8,%rdi
  38:	4c 89 44 24 38       	mov    %r8,0x38(%rsp)
  3d:	e8                   	.byte 0xe8
  3e:	bf                   	.byte 0xbf
  3f:	19                   	.byte 0x19