BUG: unable to handle kernel NULL pointer dereference at 00000000000000fc
PGD 0 P4D 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 12582 Comm: modprobe Not tainted 4.19.211-syzkaller #0
IPVS: ftp: loaded support on port[0] = 21
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:qlink_to_object mm/kasan/quarantine.c:136 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:141 [inline]
RIP: 0010:qlist_free_all+0x28/0x140 mm/kasan/quarantine.c:166
Code: 90 90 41 57 41 56 41 55 41 54 55 53 48 8b 1f 48 85 db 0f 84 08 01 00 00 48 89 f5 49 89 fd 48 85 ed 49 89 ee 0f 84 8b 00 00 00 <49> 63 86 fc 00 00 00 4c 8b 23 48 29 c3 48 83 3d 93 10 59 08 00 0f
RSP: 0018:ffff888098447b18 EFLAGS: 00010246
RAX: ffffea0000000000 RBX: ffff888000000000 RCX: ffffea0000000007
RDX: 0000000000000000 RSI: ffffffff812b5eca RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000000 R12: ffff888000000000
R13: ffff888098447b50 R14: 0000000000000000 R15: 0000000000000286
FS:  00007f0c9df884c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000fc CR3: 0000000025c05000 CR4: 00000000003426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 quarantine_reduce+0x1a9/0x230 mm/kasan/quarantine.c:259
 kasan_kmalloc+0xa2/0x160 mm/kasan/kasan.c:538
 slab_post_alloc_hook mm/slab.h:445 [inline]
 slab_alloc mm/slab.c:3397 [inline]
 kmem_cache_alloc+0x110/0x370 mm/slab.c:3557
 getname_flags+0xce/0x590 fs/namei.c:140
 do_sys_open+0x26c/0x520 fs/open.c:1079
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f0c9da7d9b1
Code: f7 d8 bf ff ff ff ff 64 89 02 eb cb 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 80 3f 00 74 1b be 00 08 09 00 b8 02 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 1f 89 c7 e9 00 ff ff ff 48 8b 05 b1 54 2e 00
RSP: 002b:00007ffc0b8e34c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000056170a495090 RCX: 00007f0c9da7d9b1
RDX: 0000000000000000 RSI: 0000000000090800 RDI: 00005617090c3e99
RBP: 00005617090c3e99 R08: 0000000000000003 R09: 0000000000000020
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 00005617092cb068 R15: 00054486b145c780
Modules linked in:
CR2: 00000000000000fc
---[ end trace 1b8654b26032968d ]---
RIP: 0010:qlink_to_object mm/kasan/quarantine.c:136 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:141 [inline]
RIP: 0010:qlist_free_all+0x28/0x140 mm/kasan/quarantine.c:166
Code: 90 90 41 57 41 56 41 55 41 54 55 53 48 8b 1f 48 85 db 0f 84 08 01 00 00 48 89 f5 49 89 fd 48 85 ed 49 89 ee 0f 84 8b 00 00 00 <49> 63 86 fc 00 00 00 4c 8b 23 48 29 c3 48 83 3d 93 10 59 08 00 0f
RSP: 0018:ffff888098447b18 EFLAGS: 00010246
RAX: ffffea0000000000 RBX: ffff888000000000 RCX: ffffea0000000007
RDX: 0000000000000000 RSI: ffffffff812b5eca RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000000 R12: ffff888000000000
R13: ffff888098447b50 R14: 0000000000000000 R15: 0000000000000286
FS:  00007f0c9df884c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000fc CR3: 0000000025c05000 CR4: 00000000003426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	90                   	nop
   2:	41 57                	push   %r15
   4:	41 56                	push   %r14
   6:	41 55                	push   %r13
   8:	41 54                	push   %r12
   a:	55                   	push   %rbp
   b:	53                   	push   %rbx
   c:	48 8b 1f             	mov    (%rdi),%rbx
   f:	48 85 db             	test   %rbx,%rbx
  12:	0f 84 08 01 00 00    	je     0x120
  18:	48 89 f5             	mov    %rsi,%rbp
  1b:	49 89 fd             	mov    %rdi,%r13
  1e:	48 85 ed             	test   %rbp,%rbp
  21:	49 89 ee             	mov    %rbp,%r14
  24:	0f 84 8b 00 00 00    	je     0xb5
* 2a:	49 63 86 fc 00 00 00 	movslq 0xfc(%r14),%rax <-- trapping instruction
  31:	4c 8b 23             	mov    (%rbx),%r12
  34:	48 29 c3             	sub    %rax,%rbx
  37:	48 83 3d 93 10 59 08 	cmpq   $0x0,0x8591093(%rip)        # 0x85910d2
  3e:	00
  3f:	0f                   	.byte 0xf