BUG: unable to handle kernel NULL pointer dereference at 00000000000000fc
#PF error: [normal kernel read fault]
PGD 913ed067 P4D 913ed067 PUD 8f62a067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 11030 Comm: syz-executor.3 Not tainted 5.1.0-rc3+ #157
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+0x2f/0x150 mm/kasan/quarantine.c:167
Code: 57 41 56 41 55 41 54 49 89 f4 53 48 83 ec 08 48 8b 37 48 85 f6 0f 84 0d 01 00 00 4d 85 e4 49 89 fe 4d 89 e7 0f 84 8c 00 00 00 <49> 63 87 fc 00 00 00 4c 8b 2e 48 29 c6 48 83 3d e4 fb e9 06 00 0f
RSP: 0018:ffff88804a9bf730 EFLAGS: 00010246
RAX: ffffea000184de40 RBX: 0000000000000282 RCX: ffff888096db5d37
RDX: 0000000000000000 RSI: ffff888061379540 RDI: 0000000000000007
RBP: ffff88804a9bf760 R08: ffff88809bc4a0c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888061379540 R14: ffff88804a9bf770 R15: 0000000000000000
FS:  00007f9a29d22700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000fc CR3: 000000008cc26000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 quarantine_reduce+0x169/0x1b0 mm/kasan/quarantine.c:260
 __kasan_kmalloc.constprop.0+0xa3/0xe0 mm/kasan/common.c:478
 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:505
 slab_post_alloc_hook mm/slab.h:437 [inline]
 slab_alloc_node mm/slab.c:3337 [inline]
 kmem_cache_alloc_node+0x131/0x710 mm/slab.c:3647
 __alloc_skb+0xd5/0x5e0 net/core/skbuff.c:196
 alloc_skb include/linux/skbuff.h:1058 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1182 [inline]
 netlink_sendmsg+0x97b/0xd70 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0xdd/0x130 net/socket.c:661
 ___sys_sendmsg+0x3e2/0x930 net/socket.c:2260
 __sys_sendmmsg+0x1bf/0x4d0 net/socket.c:2355
 __do_sys_sendmmsg net/socket.c:2384 [inline]
 __se_sys_sendmmsg net/socket.c:2381 [inline]
 __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2381
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4582b9
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f9a29d21c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000004582b9
RDX: 0492492492492805 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9a29d226d4
R13: 00000000004c5239 R14: 00000000004d9398 R15: 00000000ffffffff
Modules linked in:
CR2: 00000000000000fc
---[ end trace 09b1c8ceb49ace22 ]---
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+0x2f/0x150 mm/kasan/quarantine.c:167
Code: 57 41 56 41 55 41 54 49 89 f4 53 48 83 ec 08 48 8b 37 48 85 f6 0f 84 0d 01 00 00 4d 85 e4 49 89 fe 4d 89 e7 0f 84 8c 00 00 00 <49> 63 87 fc 00 00 00 4c 8b 2e 48 29 c6 48 83 3d e4 fb e9 06 00 0f
RSP: 0018:ffff88804a9bf730 EFLAGS: 00010246
RAX: ffffea000184de40 RBX: 0000000000000282 RCX: ffff888096db5d37
RDX: 0000000000000000 RSI: ffff888061379540 RDI: 0000000000000007
RBP: ffff88804a9bf760 R08: ffff88809bc4a0c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888061379540 R14: ffff88804a9bf770 R15: 0000000000000000
FS:  00007f9a29d22700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbb179f8518 CR3: 000000008cc26000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400