BUG: kernel NULL pointer dereference, address: 00000000000000c0
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 72251067 P4D 72251067 PUD 1898f067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 6570 Comm: syz-fuzzer Not tainted 5.15.0-rc6-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 4b be 81 4c 8b 3e 48 29 c6 48 89
RSP: 0018:ffffc90002bdf878 EFLAGS: 00010246
RAX: ffffea0000000000 RBX: ffff88807b834800 RCX: ffffea0000000007
RDX: 0000000000000000 RSI: ffff888000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000002e
R10: ffffffff81348f0a R11: 000000000000003f R12: dffffc0000000000
R13: ffffc90002bdf8b0 R14: ffffea0000000000 R15: ffff888000000000
FS:  000000c0000d2090(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000c0 CR3: 000000006f2b2000 CR4: 00000000003526f0
Call Trace:
 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272
 __kasan_slab_alloc+0x95/0xb0 mm/kasan/common.c:444
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook mm/slab.h:519 [inline]
 slab_alloc_node mm/slub.c:3213 [inline]
 __kmalloc_node_track_caller+0x23d/0x340 mm/slub.c:4947
 kmalloc_reserve net/core/skbuff.c:355 [inline]
 __alloc_skb+0xde/0x340 net/core/skbuff.c:426
 alloc_skb_fclone include/linux/skbuff.h:1166 [inline]
 sk_stream_alloc_skb+0x109/0xc30 net/ipv4/tcp.c:887
 tcp_sendmsg_locked+0xc78/0x2f10 net/ipv4/tcp.c:1309
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1461
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:821
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:724
 sock_write_iter+0x289/0x3c0 net/socket.c:1057
 call_write_iter include/linux/fs.h:2163 [inline]
 new_sync_write+0x429/0x660 fs/read_write.c:507
 vfs_write+0x7cf/0xae0 fs/read_write.c:594
 ksys_write+0x1ee/0x250 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4b129b
Code: fb ff eb bd e8 46 96 fb ff e9 61 ff ff ff cc e8 3b 62 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30
RSP: 002b:000000c001807310 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000c00001c000 RCX: 00000000004b129b
RDX: 0000000000000004 RSI: 000000c00000a200 RDI: 0000000000000006
RBP: 000000c001807360 R08: 000000c001807401 R09: 0000000000000004
R10: 0000000000000008 R11: 0000000000000202 R12: 000000000000011e
R13: 000000c0004d8000 R14: 000000000000000f R15: 00000000000094e8
Modules linked in:
CR2: 00000000000000c0
---[ end trace d8a4c3f10ec99063 ]---
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 4b be 81 4c 8b 3e 48 29 c6 48 89
RSP: 0018:ffffc90002bdf878 EFLAGS: 00010246
RAX: ffffea0000000000 RBX: ffff88807b834800 RCX: ffffea0000000007
RDX: 0000000000000000 RSI: ffff888000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000002e
R10: ffffffff81348f0a R11: 000000000000003f R12: dffffc0000000000
R13: ffffc90002bdf8b0 R14: ffffea0000000000 R15: ffff888000000000
FS:  000000c0000d2090(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000c0 CR3: 000000006f2b2000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	f5                   	cmc
   1:	48 83 ec 08          	sub    $0x8,%rsp
   5:	48 8b 37             	mov    (%rdi),%rsi
   8:	48 85 f6             	test   %rsi,%rsi
   b:	0f 84 96 00 00 00    	je     0xa7
  11:	49 be 00 00 00 00 00 	movabs $0xffffea0000000000,%r14
  18:	ea ff ff
  1b:	49 89 fd             	mov    %rdi,%r13
  1e:	49 bc 00 00 00 00 00 	movabs $0xdffffc0000000000,%r12
  25:	fc ff df
  28:	eb 2d                	jmp    0x57
* 2a:	48 63 87 c0 00 00 00 	movslq 0xc0(%rdi),%rax <-- trapping instruction
  31:	48 c7 c2 a5 4b be 81 	mov    $0xffffffff81be4ba5,%rdx
  38:	4c 8b 3e             	mov    (%rsi),%r15
  3b:	48 29 c6             	sub    %rax,%rsi
  3e:	48                   	rex.W
  3f:	89                   	.byte 0x89