------------[ cut here ]------------
ap->ops->qc_defer(qc)
WARNING: drivers/ata/libata-scsi.c:1677 at ata_scsi_deferred_qc_work+0x199/0x1f0 drivers/ata/libata-scsi.c:1677, CPU#2: kworker/2:1H/796
Modules linked in:
CPU: 2 UID: 0 PID: 796 Comm: kworker/2:1H Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: events_highpri ata_scsi_deferred_qc_work
RIP: 0010:ata_scsi_deferred_qc_work+0x199/0x1f0 drivers/ata/libata-scsi.c:1677
Code: 48 48 8b bb 90 df ff ff 48 89 ee 5b 5d 41 5c 41 5d 41 5e 41 5f e9 f7 58 15 05 e8 12 03 f8 fb e9 0d ff ff ff e8 98 a3 8b fb 90 <0f> 0b 90 eb 86 4c 89 ff e8 2a 03 f8 fb e9 bb fe ff ff 4c 89 ef e8
RSP: 0018:ffffc90004b3fc10 EFLAGS: 00010093
RAX: 0000000000000000 RBX: ffff888029a32080 RCX: ffffffff867cf7ef
RDX: ffff888027ab2480 RSI: ffffffff867cf868 RDI: ffff888027ab2480
RBP: 0000000000000246 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 000000000000760b R12: 0000000000000001
R13: ffff888029a30010 R14: ffff888029a31710 R15: ffff888029a320c8
FS:  0000000000000000(0000) GS:ffff8880d6548000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c347c45 CR3: 0000000027487000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275
 process_scheduled_works kernel/workqueue.c:3358 [inline]
 worker_thread+0x5da/0xe40 kernel/workqueue.c:3439
 kthread+0x370/0x450 kernel/kthread.c:467
 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>