On Wed, 2017-01-25 at 18:25 +0100, Christoph Hellwig wrote:
> Hi all,
>
> this series splits the support for SCSI passthrough commands from the
> main struct request used all over the block layer into a separate
> scsi_request structure that drivers that want to support SCSI passthough
> need to embedded as the first thing into their request-private data,
> similar to how we handle NVMe passthrough commands.
>
> To support this I've added support for that the private data after
> request structure to the legacy request path instead, so that it can
> be treated the same way as the blk-mq path. Compare to the current
> scsi_cmnd allocator that actually is a major simplification.
>
> Changes since V1:
> - fix handling of a NULL sense pointer in __scsi_execute
> - clean up handling of the flush flags in the block layer and MD
> - additional small cleanup in dm-rq
Hello Christoph,
Thanks for having fixed the NULL pointer issue I had reported for v1.
However, if I try to run my srp-test testsuite on top of your
hch-block/block-pc-refactor branch (commit ID a07dc3521034) merged
with v4.10-rc5 the following appears on the console:
[ 707.317403] BUG: scheduling while atomic: fio/9073/0x00000003
[ 707.317404] 1 lock held by fio/9073:
[ 707.317404] #0: (rcu_read_lock){......}, at: [<ffffffff8132618e>] __blk_mq_run_hw_queue+0xde/0x1c0
[ 707.317409] Modules linked in: dm_service_time ib_srp scsi_transport_srp target_core_user uio target_core_pscsi target_core_file ib_srpt target_core_iblock target_core_mod brd netconsole xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat libcrc32c nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp tun bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables af_packet ib_ipoib rdma_ucm ib_ucm ib_uverbs ib_umad rdma_cm configfs ib_cm iw_cm msr mlx4_ib ib_core sb_edac edac_core x86_pkg_temp_thermal intel_powerclamp coretemp ipmi_ssif kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul mlx4_core crc32c_intel ghash_clmulni_intel hid_generic pcbc usbhid iTCO_wdt tg3 aesni_intel
[ 707.317445] ptp iTCO_vendor_support aes_x86_64 crypto_simd pps_core glue_helper dcdbas ipmi_si ipmi_devintf libphy devlink lpc_ich cryptd pcspkr ipmi_msghandler mfd_core fjes mei_me tpm_tis button tpm_tis_core shpchp mei tpm wmi mgag200 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm sr_mod cdrom drm ehci_pci ehci_hcd usbcore usb_common sg dm_multipath dm_mod scsi_dh_rdac scsi_dh_emc scsi_dh_alua autofs4
[ 707.317469] CPU: 6 PID: 9073 Comm: fio Tainted: G W 4.10.0-rc5-dbg+ #1
[ 707.317470] Hardware name: Dell Inc. PowerEdge R430/03XKDV, BIOS 1.0.2 11/17/2014
[ 707.317470] Call Trace:
[ 707.317473] dump_stack+0x68/0x93
[ 707.317475] __schedule_bug+0x5b/0x80
[ 707.317477] __schedule+0x762/0xb00
[ 707.317479] schedule+0x38/0x90
[ 707.317481] schedule_timeout+0x2fe/0x640
[ 707.317491] io_schedule_timeout+0x9f/0x110
[ 707.317493] blk_mq_get_tag+0x158/0x260
[ 707.317496] __blk_mq_alloc_request+0x16/0xe0
[ 707.317498] blk_mq_sched_get_request+0x30d/0x360
[ 707.317502] blk_mq_alloc_request+0x3b/0x90
[ 707.317505] blk_get_request+0x2f/0x110
[ 707.317507] multipath_clone_and_map+0xcd/0x140 [dm_multipath]
[ 707.317512] map_request+0x3c/0x290 [dm_mod]
[ 707.317517] dm_mq_queue_rq+0x77/0x100 [dm_mod]
[ 707.317519] blk_mq_dispatch_rq_list+0x1ff/0x320
[ 707.317521] blk_mq_sched_dispatch_requests+0xa9/0xe0
[ 707.317523] __blk_mq_run_hw_queue+0x122/0x1c0
[ 707.317528] blk_mq_run_hw_queue+0x84/0x90
[ 707.317530] blk_mq_flush_plug_list+0x39f/0x480
[ 707.317531] blk_flush_plug_list+0xee/0x270
[ 707.317533] blk_finish_plug+0x27/0x40
[ 707.317534] do_io_submit+0x475/0x900
[ 707.317537] SyS_io_submit+0xb/0x10
[ 707.317539] entry_SYSCALL_64_fastpath+0x18/0xad
Bart.--
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