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+BUG: unable to handle kernel NULL pointer dereference at 0000000000000180
+#PF error: [normal kernel read fault]
+PGD 8000000056051067 P4D 8000000056051067 PUD 4c2a4067 PMD 0 
+Oops: 0000 [#1] SMP KASAN PTI
+CPU: 0 PID: 469 Comm: syz-executor.0 Not tainted 5.0.2 #1
+Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 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+0x35/0xc0 mm/kasan/quarantine.c:167
+Code: 89 f3 48 8b 37 48 85 f6 0f 84 8e 00 00 00 49 89 fd 41 be 00 00 00 80 49 c7 c4 05 54 62 81 49 bf 00 00 00 00 00 ea ff ff eb 1d <48> 63 87 80 01 00 00 48 8b 2e 4c 89 e2 48 29 c6 e8 56 bc ff ff 48
+RSP: 0018:ffff88805536fd38 EFLAGS: 00010246
+RAX: ffffea000014bb80 RBX: 0000000000000000 RCX: ffffea000014bb87
+RDX: 0000000000000000 RSI: ffffffff852eea20 RDI: 0000000000000000
+RBP: ffffffff852eea20 R08: fffff9400025cffe R09: fffff9400025cffc
+R10: fffff9400025cffd R11: ffffea00012e7fef R12: ffffffff81625405
+R13: ffff88805536fd70 R14: 0000000080000000 R15: ffffea0000000000
+FS:  0000000001cf2940(0000) GS:ffff88806d000000(0000) knlGS:0000000000000000
+CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
+CR2: 0000000000000180 CR3: 000000006c77a006 CR4: 00000000001606f0
+Call Trace:
+ quarantine_reduce+0x178/0x1b0 mm/kasan/quarantine.c:260
+ __kasan_kmalloc.constprop.6+0x98/0xd0 mm/kasan/common.c:476
+ slab_post_alloc_hook mm/slab.h:440 [inline]
+ slab_alloc_node mm/slub.c:2758 [inline]
+ slab_alloc mm/slub.c:2766 [inline]
+ kmem_cache_alloc+0xcd/0x270 mm/slub.c:2771
+ getname_flags fs/namei.c:140 [inline]
+ getname_flags+0xcd/0x5a0 fs/namei.c:129
+ do_sys_open+0x269/0x550 fs/open.c:1057
+ do_syscall_64+0xbc/0x4e0 arch/x86/entry/common.c:290
+ entry_SYSCALL_64_after_hwframe+0x49/0xbe
+RIP: 0033:0x411620
+Code: 48 83 c4 08 48 3d 01 f0 ff ff 0f 83 4a 19 00 00 c3 66 0f 1f 84 00 00 00 00 00 83 3d ed 4f 63 00 00 75 14 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 24 19 00 00 c3 48 83 ec 08 e8 8a f8 ff ff
+RSP: 002b:00007ffecb6b0358 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
+RAX: ffffffffffffffda RBX: 00007ffecb6b0384 RCX: 0000000000411620
+RDX: 00007ffecb6b038a RSI: 0000000000080001 RDI: 00000000004ae9ef
+RBP: 00007ffecb6b0380 R08: 0000000000000000 R09: 0000000000000000
+R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
+R13: 00000000004ae9ef R14: 0000000000000000 R15: 0000000000000000
+Modules linked in:
+Dumping ftrace buffer:
+   (ftrace buffer empty)
+CR2: 0000000000000180
+---[ end trace a29e14213d1801b6 ]---
+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+0x35/0xc0 mm/kasan/quarantine.c:167
+Code: 89 f3 48 8b 37 48 85 f6 0f 84 8e 00 00 00 49 89 fd 41 be 00 00 00 80 49 c7 c4 05 54 62 81 49 bf 00 00 00 00 00 ea ff ff eb 1d <48> 63 87 80 01 00 00 48 8b 2e 4c 89 e2 48 29 c6 e8 56 bc ff ff 48
+RSP: 0018:ffff88805536fd38 EFLAGS: 00010246
+RAX: ffffea000014bb80 RBX: 0000000000000000 RCX: ffffea000014bb87
+RDX: 0000000000000000 RSI: ffffffff852eea20 RDI: 0000000000000000
+RBP: ffffffff852eea20 R08: fffff9400025cffe R09: fffff9400025cffc
+R10: fffff9400025cffd R11: ffffea00012e7fef R12: ffffffff81625405
+R13: ffff88805536fd70 R14: 0000000080000000 R15: ffffea0000000000
+FS:  0000000001cf2940(0000) GS:ffff88806d000000(0000) knlGS:0000000000000000
+CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
+CR2: 0000000000000180 CR3: 000000006c77a006 CR4: 00000000001606f0