BUG: unable to handle kernel NULL pointer dereference at 00000000000000fc
netlink: 'syz-executor.4': attribute type 1 has an invalid length.
PGD a8ee5067 P4D a8ee5067 PUD b3d4e067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 30784 Comm: syz-executor.2 Not tainted 4.19.192-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:136 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:141 [inline]
RIP: 0010:qlist_free_all+0x28/0x140 mm/kasan/quarantine.c:166
Code: 90 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 fc 00 00 00 4c 8b 23 48 29 c3 48 83 3d b3 34 59 08 00 0f
RSP: 0018:ffff8880517cf8d0 EFLAGS: 00010246
RAX: ffffea0000000000 RBX: ffff888000000000 RCX: ffffea0000000007
RDX: 0000000000000000 RSI: ffffffff812b5e9a RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
bond252: Enslaving bridge1046 as a backup interface with an up link
R10: 0000000000000007 R11: 0000000000000000 R12: ffff888000000000
R13: ffff8880517cf908 R14: 0000000000000000 R15: 0000000000000282
FS:  0000000002ad2400(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000fc CR3: 000000002f967000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 quarantine_reduce+0x1a9/0x230 mm/kasan/quarantine.c:259
 kasan_kmalloc+0xa2/0x160 mm/kasan/kasan.c:538
 slab_post_alloc_hook mm/slab.h:445 [inline]
 slab_alloc_node mm/slab.c:3340 [inline]
 kmem_cache_alloc_node+0x133/0x3b0 mm/slab.c:3647
 alloc_task_struct_node kernel/fork.c:157 [inline]
 dup_task_struct kernel/fork.c:807 [inline]
 copy_process.part.0+0x1ceb/0x8260 kernel/fork.c:1752
 copy_process kernel/fork.c:1709 [inline]
 _do_fork+0x22f/0xf30 kernel/fork.c:2218
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x467a01
Code: 48 85 ff 74 3d 48 85 f6 74 38 48 83 ee 10 48 89 4e 08 48 89 3e 48 89 d7 4c 89 c2 4d 89 c8 4c 8b 54 24 08 b8 38 00 00 00 0f 05 <48> 85 c0 7c 13 74 01 c3 31 ed 58 5f ff d0 48 89 c7 b8 3c 00 00 00
RSP: 002b:00007ffd7102e9d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fed4a3bf700 RCX: 0000000000467a01
RDX: 00007fed4a3bf9d0 RSI: 00007fed4a3bf2f0 RDI: 00000000003d0f00
RBP: 00007ffd7102ec10 R08: 00007fed4a3bf700 R09: 00007fed4a3bf700
R10: 00007fed4a3bf9d0 R11: 0000000000000206 R12: 00007ffd7102ea8e
R13: 00007ffd7102ea8f R14: 00007fed4a3bf300 R15: 0000000000022000
Modules linked in:
CR2: 00000000000000fc
---[ end trace 44051158c6e9c1d0 ]---
RIP: 0010:qlink_to_object mm/kasan/quarantine.c:136 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:141 [inline]
RIP: 0010:qlist_free_all+0x28/0x140 mm/kasan/quarantine.c:166
Code: 90 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 fc 00 00 00 4c 8b 23 48 29 c3 48 83 3d b3 34 59 08 00 0f
bond252 (unregistering): Releasing backup interface bridge1046
RSP: 0018:ffff8880517cf8d0 EFLAGS: 00010246
RAX: ffffea0000000000 RBX: ffff888000000000 RCX: ffffea0000000007
RDX: 0000000000000000 RSI: ffffffff812b5e9a RDI: 0000000000000007
bond252 (unregistering): Released all slaves
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000000 R12: ffff888000000000
R13: ffff8880517cf908 R14: 0000000000000000 R15: 0000000000000282
FS:  0000000002ad2400(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000541198 CR3: 000000002f967000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400