BUG: kernel NULL pointer dereference, address: 0000000000000080
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 574 Comm: modprobe Not tainted 5.9.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:qlink_to_object mm/kasan/quarantine.c:137 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:142 [inline]
RIP: 0010:qlist_free_all+0x36/0x170 mm/kasan/quarantine.c:168
Code: 53 48 83 ec 10 48 8b 37 48 85 f6 0f 84 36 01 00 00 49 bf 00 00 00 00 00 fc ff df 48 85 ed 49 89 fd 48 89 ef 0f 84 97 00 00 00 <48> 63 87 80 00 00 00 4c 8b 26 48 29 c6 48 83 3d 95 5a 45 08 00 0f
RSP: 0018:ffffc900088878f0 EFLAGS: 00010202
RAX: ffffea0001ddc000 RBX: 0000000000000286 RCX: ffffea0001ddc000
RDX: 0000000000000001 RSI: ffff888077777777 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8d0b79ff
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888077777777
R13: ffffc90008887938 R14: 0000000000000200 R15: dffffc0000000000
FS:  00007f5f09be94c0(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000080 CR3: 000000009df50000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 quarantine_reduce+0x17e/0x200 mm/kasan/quarantine.c:261
 __kasan_kmalloc.constprop.0+0x9e/0xd0 mm/kasan/common.c:442
 slab_post_alloc_hook mm/slab.h:518 [inline]
 slab_alloc mm/slab.c:3312 [inline]
 kmem_cache_alloc+0x13a/0x3f0 mm/slab.c:3482
 vm_area_dup+0x88/0x2b0 kernel/fork.c:355
 __split_vma+0xa5/0x560 mm/mmap.c:2698
 split_vma+0x95/0xd0 mm/mmap.c:2756
 mprotect_fixup+0x71c/0x940 mm/mprotect.c:473
 do_mprotect_pkey+0x531/0x940 mm/mprotect.c:613
 __do_sys_mprotect mm/mprotect.c:638 [inline]
 __se_sys_mprotect mm/mprotect.c:635 [inline]
 __x64_sys_mprotect+0x74/0xb0 mm/mprotect.c:635
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f5f099e43a7
Code: ff 66 90 b8 0b 00 00 00 0f 05 48 3d 01 f0 ff ff 73 01 c3 48 8d 0d 89 bd 20 00 f7 d8 89 01 48 83 c8 ff c3 b8 0a 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8d 0d 69 bd 20 00 f7 d8 89 01 48 83
RSP: 002b:00007ffd75237c08 EFLAGS: 00000206 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 00007f5f09be8000 RCX: 00007f5f099e43a7
RDX: 0000000000000001 RSI: 0000000000004000 RDI: 00007f5f099c1000
RBP: 00007ffd75237d40 R08: 0000000000000000 R09: 000000000000000f
R10: 0000000000000003 R11: 0000000000000206 R12: 00007f5f09be8000
R13: 00007f5f0964b838 R14: 00007f5f0962c000 R15: 0000000000399018
Modules linked in:
CR2: 0000000000000080
---[ end trace be8510536bc97ae6 ]---
RIP: 0010:qlink_to_object mm/kasan/quarantine.c:137 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:142 [inline]
RIP: 0010:qlist_free_all+0x36/0x170 mm/kasan/quarantine.c:168
Code: 53 48 83 ec 10 48 8b 37 48 85 f6 0f 84 36 01 00 00 49 bf 00 00 00 00 00 fc ff df 48 85 ed 49 89 fd 48 89 ef 0f 84 97 00 00 00 <48> 63 87 80 00 00 00 4c 8b 26 48 29 c6 48 83 3d 95 5a 45 08 00 0f
RSP: 0018:ffffc900088878f0 EFLAGS: 00010202
RAX: ffffea0001ddc000 RBX: 0000000000000286 RCX: ffffea0001ddc000
RDX: 0000000000000001 RSI: ffff888077777777 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8d0b79ff
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888077777777
R13: ffffc90008887938 R14: 0000000000000200 R15: dffffc0000000000
FS:  00007f5f09be94c0(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f6413ba36f CR3: 000000009df50000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400