------------[ cut here ]------------
WARNING: CPU: 3 PID: 7174 at drivers/ata/libata-core.c:5394 ata_qc_issue+0x519/0xea0 drivers/ata/libata-core.c:5393
Kernel panic - not syncing: panic_on_warn set ...

CPU: 3 PID: 7174 Comm: syz-executor2 Not tainted 4.13.0-next-20170915+ #5
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 panic+0x1e4/0x417 kernel/panic.c:181
 __warn+0x1c4/0x1d9 kernel/panic.c:542
 report_bug+0x211/0x2d0 lib/bug.c:183
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:178
 do_trap_no_signal arch/x86/kernel/traps.c:212 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:261
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:298
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:311
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905
RIP: 0010:ata_qc_issue+0x519/0xea0 drivers/ata/libata-core.c:5393
RSP: 0018:ffff880045eeeee8 EFLAGS: 00010016
RAX: 0000000000010000 RBX: 0000000000000002 RCX: ffffc90002f02000
RDX: 0000000000000a75 RSI: ffffffff83620ce9 RDI: ffff88003b1a0260
RBP: ffff880045eef000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: ffffed0007634040 R12: 0000000000000000
R13: ffff88003b1a23ec R14: ffff88003b1a01c8 R15: ffff88003b1a0040
9pnet_virtio: no channels available for device ./file0
 ata_scsi_translate+0x34a/0x5e0 drivers/ata/libata-scsi.c:2023
 __ata_scsi_queuecmd drivers/ata/libata-scsi.c:4325 [inline]
 ata_scsi_queuecmd+0x2ae/0x6b0 drivers/ata/libata-scsi.c:4374
 scsi_dispatch_cmd+0x432/0xb60 drivers/scsi/scsi_lib.c:1712
 scsi_request_fn+0xdf0/0x1e50 drivers/scsi/scsi_lib.c:1847
 __blk_run_queue_uncond block/blk-core.c:376 [inline]
 __blk_run_queue+0x1a6/0x370 block/blk-core.c:396
 __elv_add_request+0x497/0xce0 block/elevator.c:673
 blk_execute_rq_nowait+0x1f8/0x310 block/blk-exec.c:77
 blk_execute_rq+0x12f/0x200 block/blk-exec.c:101
 sg_scsi_ioctl+0x38b/0x750 block/scsi_ioctl.c:508
 sg_ioctl+0x192d/0x2ed0 drivers/scsi/sg.c:1070
 vfs_ioctl fs/ioctl.c:45 [inline]
 do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685
 SYSC_ioctl fs/ioctl.c:700 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x4474f9
RSP: 002b:00007f7f875bcc08 EFLAGS: 00000296 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000016 RCX: 00000000004474f9
RDX: 0000000020001000 RSI: 0000000000000001 RDI: 0000000000000016
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 00000000ffffffff
R13: 00000000000058a0 R14: 00000000006e8960 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..