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A mirror of the official Linux kernel repository just in case
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In certain tests where the SCSI error handler issues an abort that is already outstanding, we will cleanup the command so that the SCSI error handler can proceed. In some of these cases we were seeing a command mismatch: kernel: scsi host2: bnx2fc: xid:0x42b eh_abort - refcnt = 2 kernel: bnx2fc: eh_abort: io_req (xid = 0x42b) already in abts processing kernel: scsi host2: bnx2fc: xid:0x42b Entered bnx2fc_initiate_cleanup kernel: scsi host2: bnx2fc: xid:0x42b CLEANUP io_req xid = 0x80b kernel: scsi host2: bnx2fc: xid:0x80b cq_compl- cleanup resp rcvd kernel: scsi host2: bnx2fc: xid:0x42b complete - rx_state = 9 kernel: scsi host2: bnx2fc: xid:0x42b Entered process_cleanup_compl refcnt = 2, cmd_type = 1 kernel: scsi host2: bnx2fc: xid:0x42b scsi_done. err_code = 0x7 kernel: scsi host2: bnx2fc: xid:0x42b sc=ffff8807f93dfb80, result=0x7, retries=0, allowed=5 kernel: ------------[ cut here ]------------ kernel: WARNING: at /root/rpmbuild/BUILD/netxtreme2-7.14.43/obj/default/bnx2fc-2.12.1/driver/bnx2fc_io.c:1347 bnx2fc_eh_abort+0x56f/0x680 [bnx2fc]() kernel: xid=0x42b refcount=-1 kernel: Modules linked in: kernel: nls_utf8 isofs sr_mod cdrom tcp_lp dm_round_robin xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 tun bridge ebtable_filter ebtables fuse ip6table_filter ip6_tables iptable_filter bnx2fc(OE) cnic(OE) uio fcoe libfcoe 8021q libfc garp mrp scsi_transport_fc stp llc scsi_tgt vfat fat dm_service_time intel_powerclamp coretemp intel_rapl iosf_mbi kvm_intel kvm irqbypass crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd ses enclosure ipmi_ssif i2c_core hpilo hpwdt wmi sg ipmi_devintf pcspkr ipmi_si ipmi_msghandler shpchp acpi_power_meter dm_multipath nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables xfs sd_mod crc_t10dif kernel: crct10dif_generic bnx2x(OE) crct10dif_pclmul crct10dif_common crc32c_intel mdio ptp pps_core libcrc32c smartpqi scsi_transport_sas fjes uas usb_storage dm_mirror dm_region_hash dm_log dm_mod kernel: CPU: 9 PID: 2012 Comm: scsi_eh_2 Tainted: G W OE ------------ 3.10.0-514.el7.x86_64 #1 kernel: Hardware name: HPE Synergy 480 Gen10/Synergy 480 Gen10 Compute Module, BIOS I42 03/21/2018 kernel: ffff8807f25a3d98 0000000015e7fa0c ffff8807f25a3d50 ffffffff81685eac kernel: ffff8807f25a3d88 ffffffff81085820 ffff8807f8e39000 ffff880801ff7468 kernel: ffff880801ff7610 0000000000002002 ffff8807f8e39014 ffff8807f25a3df0 kernel: Call Trace: kernel: [<ffffffff81685eac>] dump_stack+0x19/0x1b kernel: [<ffffffff81085820>] warn_slowpath_common+0x70/0xb0 kernel: [<ffffffff810858bc>] warn_slowpath_fmt+0x5c/0x80 kernel: [<ffffffff8168d842>] ? _raw_spin_lock_bh+0x12/0x50 kernel: [<ffffffffa0549e6f>] bnx2fc_eh_abort+0x56f/0x680 [bnx2fc] kernel: [<ffffffff814570af>] scsi_error_handler+0x59f/0x8b0 kernel: [<ffffffff81456b10>] ? scsi_eh_get_sense+0x250/0x250 kernel: [<ffffffff810b052f>] kthread+0xcf/0xe0 kernel: [<ffffffff810b0460>] ? kthread_create_on_node+0x140/0x140 kernel: [<ffffffff81696418>] ret_from_fork+0x58/0x90 kernel: [<ffffffff810b0460>] ? kthread_create_on_node+0x140/0x140 kernel: ---[ end trace 42deb88f2032b111 ]--- The reason that there was a mismatch is that the SCSI command is actual returned from the cleanup handler. In previous testing, the type of cleanup notification we'd get from the CQE did not trigger the code that returned the SCSI command. To overcome the previous behavior we would put a reference in bnx2fc_abts_cleanup() to account for the SCSI command. However, in cases where the SCSI command is actually off, we end up with an extra put. The fix for this is to only take the extra put in bnx2fc_abts_cleanup if the completion for the cleanup times out. Signed-off-by: Chad Dupuis <cdupuis@marvell.com> Signed-off-by: Saurav Kashyap <skashyap@marvell.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> |
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| certs | ||
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| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.