BUG: kernel NULL pointer dereference, address: 00000000000000c0
#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: 0 PID: 8468 Comm: systemd-sysctl Not tainted 5.12.0-rc8-next-20210423-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:129 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:134 [inline]
RIP: 0010:qlist_free_all+0x35/0xc0 mm/kasan/quarantine.c:165
Code: f5 48 83 ec 08 48 8b 37 48 85 f6 0f 84 96 00 00 00 49 be 00 00 00 00 00 ea ff ff 49 89 fd 49 bc 00 00 00 00 00 fc ff df eb 2d <48> 63 87 c0 00 00 00 48 c7 c2 a5 00 ba 81 4c 8b 3e 48 29 c6 48 89
RSP: 0018:ffffc900016bfb90 EFLAGS: 00010246

RAX: ffffea0007ffff80 RBX: ffff888024239d68 RCX: ffffea0007ffff87
RDX: 0000000000000000 RSI: ffff8881ffffea00 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000002e
R10: ffffffff81342fea R11: 000000000000003f R12: dffffc0000000000
R13: ffffc900016bfbc8 R14: ffffea0000000000 R15: ffff8881ffffea00
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000c0 CR3: 00000000159ce000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272
 __kasan_slab_alloc+0x8e/0xa0 mm/kasan/common.c:438
 kasan_slab_alloc include/linux/kasan.h:236 [inline]
 slab_post_alloc_hook mm/slab.h:527 [inline]
 slab_alloc_node mm/slub.c:2924 [inline]
 slab_alloc mm/slub.c:2932 [inline]
 kmem_cache_alloc+0x219/0x3a0 mm/slub.c:2937
 vm_area_alloc+0x1c/0x110 kernel/fork.c:349
 mmap_region+0x9a4/0x1730 mm/mmap.c:1780
 do_mmap+0xcff/0x11d0 mm/mmap.c:1586
 vm_mmap_pgoff+0x1b7/0x290 mm/util.c:519
 ksys_mmap_pgoff+0x4a8/0x620 mm/mmap.c:1637
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fd7fd8e030a
Code: 89 f5 41 54 49 89 fc 55 53 74 35 49 63 e8 48 63 da 4d 89 f9 49 89 e8 4d 63 d6 48 89 da 4c 89 ee 4c 89 e7 b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 4e 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 00
RSP: 002b:00007ffcb8e9f428 EFLAGS: 00000246
 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007fd7fd8e030a
RDX: 0000000000000005 RSI: 000000000039e960 RDI: 0000000000000000
RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000802 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000039e960 R14: 0000000000000802 R15: 0000000000000000
Modules linked in:

CR2: 00000000000000c0
---[ end trace a1b9623473ab9cc2 ]---
RIP: 0010:qlink_to_object mm/kasan/quarantine.c:129 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:134 [inline]
RIP: 0010:qlist_free_all+0x35/0xc0 mm/kasan/quarantine.c:165
Code: f5 48 83 ec 08 48 8b 37 48 85 f6 0f 84 96 00 00 00 49 be 00 00 00 00 00 ea ff ff 49 89 fd 49 bc 00 00 00 00 00 fc ff df eb 2d <48> 63 87 c0 00 00 00 48 c7 c2 a5 00 ba 81 4c 8b 3e 48 29 c6 48 89
RSP: 0018:ffffc900016bfb90 EFLAGS: 00010246

RAX: ffffea0007ffff80 RBX: ffff888024239d68 RCX: ffffea0007ffff87
RDX: 0000000000000000 RSI: ffff8881ffffea00 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000002e
R10: ffffffff81342fea R11: 000000000000003f R12: dffffc0000000000
R13: ffffc900016bfbc8 R14: ffffea0000000000 R15: ffff8881ffffea00
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000c0 CR3: 00000000159ce000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400