BUG: kernel NULL pointer dereference, address: 0000000000000080
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 214619067 P4D 214619067 PUD 20f14d067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 16808 Comm: syz-executor.0 Not tainted 5.9.0-rc7-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 35 54 45 08 00 0f
RSP: 0018:ffffc9001a3a7778 EFLAGS: 00010246
RAX: ffffea0000000000 RBX: 0000000000000286 RCX: ffffea0000000007
RDX: 0000000000000000 RSI: ffff888000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8d0c0a8f
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888000000000
R13: ffffc9001a3a77c0 R14: 0000000000000200 R15: dffffc0000000000
FS:  00007eff0eb69700(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004e1210 CR3: 0000000214704000 CR4: 00000000001506f0
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_node mm/slab.c:3258 [inline]
 kmem_cache_alloc_node+0x136/0x430 mm/slab.c:3578
 __alloc_skb+0x71/0x550 net/core/skbuff.c:198
 alloc_skb_fclone include/linux/skbuff.h:1144 [inline]
 sk_stream_alloc_skb+0x109/0xc30 net/ipv4/tcp.c:884
 do_tcp_sendpages+0xaf6/0x1bb0 net/ipv4/tcp.c:1007
 tcp_sendpage_locked net/ipv4/tcp.c:1113 [inline]
 tcp_sendpage_locked net/ipv4/tcp.c:1105 [inline]
 tcp_sendpage+0x80/0xd0 net/ipv4/tcp.c:1123
 inet_sendpage+0xd0/0x140 net/ipv4/af_inet.c:831
 kernel_sendpage net/socket.c:3642 [inline]
 sock_sendpage+0xe5/0x140 net/socket.c:944
 pipe_to_sendpage+0x2ad/0x380 fs/splice.c:448
 splice_from_pipe_feed fs/splice.c:502 [inline]
 __splice_from_pipe+0x3dc/0x830 fs/splice.c:626
 splice_from_pipe fs/splice.c:661 [inline]
 generic_splice_sendpage+0xd4/0x140 fs/splice.c:834
 do_splice_from fs/splice.c:846 [inline]
 do_splice+0xbcd/0x1820 fs/splice.c:1144
 __do_sys_splice fs/splice.c:1419 [inline]
 __se_sys_splice fs/splice.c:1401 [inline]
 __x64_sys_splice+0x198/0x250 fs/splice.c:1401
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45dd99
Code: 0d b4 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007eff0eb68c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00000000000350c0 RCX: 000000000045dd99
RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 000000000118bf78 R08: 0000000000010003 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 000000000169fb6f R14: 00007eff0eb699c0 R15: 000000000118bf2c
Modules linked in:
CR2: 0000000000000080
---[ end trace ccecec93255fcec8 ]---
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 35 54 45 08 00 0f
RSP: 0018:ffffc9001a3a7778 EFLAGS: 00010246
RAX: ffffea0000000000 RBX: 0000000000000286 RCX: ffffea0000000007
RDX: 0000000000000000 RSI: ffff888000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8d0c0a8f
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888000000000
R13: ffffc9001a3a77c0 R14: 0000000000000200 R15: dffffc0000000000
FS:  00007eff0eb69700(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004ec290 CR3: 0000000214704000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400