Oops: general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067]
CPU: 1 UID: 0 PID: 12389 Comm: syz.2.1680 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:kthread_destroy_worker+0x96/0x250
Code: f8 f8 4a 89 04 2b 4a 89 4c 2b 08 48 b8 f8 f8 f8 f8 f3 f3 f3 f3 4a 89 44 2b 10 e8 85 20 35 00 4d 8d 77 68 4c 89 f0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 f7 e8 cb 5c a0 00 49 8b 06 48 85 c0 0f
RSP: 0018:ffffc90008d96f40 EFLAGS: 00010207
RAX: 000000000000000c RBX: 1ffff920011b2dec RCX: 0000000000080000
RDX: ffffc9000fa58000 RSI: 0000000000000346 RDI: 0000000000000347
RBP: ffffc90008d97080 R08: ffff8881ac59d03b R09: 1ffff110358b3a07
R10: dffffc0000000000 R11: ffffffff85496860 R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000064 R15: fffffffffffffffc
FS:  00007fd7d9a386c0(0000) GS:ffff8882a91f9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd7d9a16ff8 CR3: 00000001af164000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 vdpasim_free+0x56/0x440
 vdpa_release_dev+0x72/0xd0
 device_release+0xc4/0x1f0
 kobject_put+0x222/0x550
 vdpasim_create+0x3a5/0x940
 vdpasim_blk_dev_add+0x11c/0x2a0
 vdpa_nl_cmd_dev_add_set_doit+0xa8b/0xbd0
 genl_family_rcv_msg_doit+0x233/0x340
 genl_rcv_msg+0x614/0x7a0
 netlink_rcv_skb+0x226/0x4a0
 genl_rcv+0x28/0x40
 netlink_unicast+0x7bb/0x940
 netlink_sendmsg+0x813/0xb40
 ____sys_sendmsg+0x9b9/0xa20
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd7d8b9e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd7d9a38028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fd7d8e25fa0 RCX: 00007fd7d8b9e159
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000010
RBP: 00007fd7d8c3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd7d8e26038 R14: 00007fd7d8e25fa0 R15: 00007ffdafde97f8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:kthread_destroy_worker+0x96/0x250
Code: f8 f8 4a 89 04 2b 4a 89 4c 2b 08 48 b8 f8 f8 f8 f8 f3 f3 f3 f3 4a 89 44 2b 10 e8 85 20 35 00 4d 8d 77 68 4c 89 f0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 f7 e8 cb 5c a0 00 49 8b 06 48 85 c0 0f
RSP: 0018:ffffc90008d96f40 EFLAGS: 00010207
RAX: 000000000000000c RBX: 1ffff920011b2dec RCX: 0000000000080000
RDX: ffffc9000fa58000 RSI: 0000000000000346 RDI: 0000000000000347
RBP: ffffc90008d97080 R08: ffff8881ac59d03b R09: 1ffff110358b3a07
R10: dffffc0000000000 R11: ffffffff85496860 R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000064 R15: fffffffffffffffc
FS:  00007fd7d9a386c0(0000) GS:ffff88818dbf9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 00000001af164000 CR4: 00000000000006f0
