BUG: kernel NULL pointer dereference, address: 000000000000013c
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 88da2067 P4D 88da2067 PUD 88da3067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 7332 Comm: syz-executor.1 Not tainted 5.7.0-rc2-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+0x28/0x140 mm/kasan/quarantine.c:167
Code: d6 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 3c 01 00 00 4c 8b 23 48 29 c3 48 83 3d ab c1 e3 07 00 0f
RSP: 0018:ffffc900021e7908 EFLAGS: 00010246
RAX: ffffea0000000000 RBX: ffff888000000000 RCX: ffffea0000000007
RDX: 0000000000000000 RSI: ffffffff8133965a RDI: 0000000000000007
RBP: 0000000000000000 R08: ffff88808795a1c0 R09: fffffbfff185cf3f
R10: ffffffff8c2e79f7 R11: fffffbfff185cf3e R12: ffff888000000000
R13: ffffc900021e7940 R14: 0000000000000000 R15: 0000000000000286
FS:  00000000013bf940(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000013c CR3: 0000000088da1000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 quarantine_reduce+0x159/0x190 mm/kasan/quarantine.c:260
 __kasan_kmalloc.constprop.0+0x97/0xd0 mm/kasan/common.c:476
 slab_post_alloc_hook mm/slab.h:586 [inline]
 slab_alloc mm/slab.c:3320 [inline]
 kmem_cache_alloc+0x11b/0x740 mm/slab.c:3484
 vm_area_dup+0x1c/0x1d0 kernel/fork.c:359
 dup_mmap kernel/fork.c:546 [inline]
 dup_mm+0x511/0x1300 kernel/fork.c:1363
 copy_mm kernel/fork.c:1419 [inline]
 copy_process+0x29cc/0x7110 kernel/fork.c:2085
 _do_fork+0x12d/0x1010 kernel/fork.c:2430
 __do_sys_clone+0xec/0x140 kernel/fork.c:2585
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x45ae5a
Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 0c 25 10 00 00 00 31 d2 4d 8d 91 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 f5 00 00 00 85 c0 41 89 c5 0f 85 fc 00 00
RSP: 002b:0000000000c9fd60 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000c9fd60 RCX: 000000000045ae5a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000c9fda0 R08: 0000000000000001 R09: 00000000013bf940
R10: 00000000013bfc10 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000c9fdf0
Modules linked in:
CR2: 000000000000013c
---[ end trace 9c6f870b5c2a8e73 ]---
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+0x28/0x140 mm/kasan/quarantine.c:167
Code: d6 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 3c 01 00 00 4c 8b 23 48 29 c3 48 83 3d ab c1 e3 07 00 0f
RSP: 0018:ffffc900021e7908 EFLAGS: 00010246
RAX: ffffea0000000000 RBX: ffff888000000000 RCX: ffffea0000000007
RDX: 0000000000000000 RSI: ffffffff8133965a RDI: 0000000000000007
RBP: 0000000000000000 R08: ffff88808795a1c0 R09: fffffbfff185cf3f
R10: ffffffff8c2e79f7 R11: fffffbfff185cf3e R12: ffff888000000000
R13: ffffc900021e7940 R14: 0000000000000000 R15: 0000000000000286
FS:  00000000013bf940(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3032b000 CR3: 0000000088da1000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400