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SubjectSoft lockup in scsi_remove_target under 3.6 (regression from 3.5)
Upgraded to 3.6 today on my dev box and after seeing an FC attached SAN
go down and come back up (due to an expected reboot) I started getting
the following in my logs. It continues even after the array is back and
functioning - I'm seeing:

kernel:[109104.348034] BUG: soft lockup - CPU#6 stuck for 23s!
[kworker/6:0:30692]

repeated on logged in sessions and backtraces like the following (this
is the first). I don't see the same problem under 3.5.

[10819.389706] device-mapper: multipath: Failing path 8:240.
[11233.683936] device-mapper: multipath: Failing path 8:240.
[108394.592042] rport-10:0-4: blocked FC remote port time out: removing target and saving binding
[108394.609594] sd 10:0:1:0: rejecting I/O to offline device
[108394.620457] lpfc 0000:0c:00.0: 2:(0):0203 Devloss timeout on WWPN 21:11:00:02:ac:01:86:06 NPort x030500 Data: x0 x7 x0
[108394.620591] sd 10:0:1:0: alua: Detached
[108394.650159] sd 10:0:1:0: [sdbc] Synchronizing SCSI cache
[108394.661071] sd 10:0:1:0: [sdbc]
[108394.667877] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
[108394.680154] ses 10:0:1:254: alua: Detached
[108420.348032] BUG: soft lockup - CPU#6 stuck for 23s! [kworker/6:0:30692]
[108420.352003] Modules linked in: nfsv4 autofs4 ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat ebtables x_tables rpcsec_gss_krb5 ipv6 nfsd nfs_acl auth_rpcgss nfs lockd sunrpc dm_round_robin dm_multipath ipmi_devintf ipmi_si ipmi_msghandler sg evdev acpi_cpufreq freq_table serio_raw mperf processor button thermal_sys coretemp kvm_intel kvm lpc_ich ioatdma mfd_core tpm_tis i2c_i801 tpm microcode tpm_bios rng_core i2c_core i5k_amb dca ses enclosure ata_generic lpfc ata_piix scsi_transport_fc scsi_tgt
[108420.352003] CPU 6
[108420.352003] Pid: 30692, comm: kworker/6:0 Not tainted 3.6.0 #5 Intel S5000PAL./S5000PAL0
[108420.352003] RIP: 0010:[<ffffffff8134e744>] [<ffffffff8134e744>] _raw_spin_unlock_irqrestore+0x5/0x6
[108420.352003] RSP: 0018:ffff8802563a7d98 EFLAGS: 00000286
[108420.352003] RAX: ffff88024e975000 RBX: 00000000000000bb RCX: 0000000000000000
[108420.352003] RDX: 0000000000000000 RSI: 0000000000000286 RDI: ffff88024e975050
[108420.352003] RBP: ffff88024e975000 R08: 0000000000000000 R09: ffffffff8166f890
[108420.352003] R10: ffff88024e975000 R11: ffffffffa00d6bf0 R12: 0000000000000000
[108420.352003] R13: ffffffff8166f890 R14: ffff88024e975000 R15: ffffffffa00d6bf0
[108420.352003] FS: 0000000000000000(0000) GS:ffff88025fd80000(0000) knlGS:0000000000000000
[108420.352003] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[108420.352003] CR2: 00007f5b5dec6070 CR3: 000000024f0eb000 CR4: 00000000000007e0
[108420.352003] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[108420.352003] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[108420.352003] Process kworker/6:0 (pid: 30692, threadinfo ffff8802563a6000, task ffff880252f32a10)
[108420.352003] Stack:
[108420.352003] ffffffff8125a498 ffff88025fd8d080 0000000000000286 ffffffffa0015c28
[108420.352003] ffff88024d1207c0 ffff88025fd8d080 ffff88025fd98100 ffffffffa0015c28
[108420.352003] 0000000000000000 ffff88024f22abd8 ffffffff81045d07 0000000000012240
[108420.352003] Call Trace:
[108420.352003] [<ffffffff8125a498>] ? scsi_remove_target+0x138/0x154
[108420.352003] [<ffffffffa0015c28>] ? store_fc_host_system_hostname+0x66/0x66 [scsi_transport_fc]
[108420.352003] [<ffffffffa0015c28>] ? store_fc_host_system_hostname+0x66/0x66 [scsi_transport_fc]
[108420.352003] [<ffffffff81045d07>] ? process_one_work+0x1f8/0x30a
[108420.352003] [<ffffffff81046034>] ? worker_thread+0x21b/0x314
[108420.352003] [<ffffffff81045e19>] ? process_one_work+0x30a/0x30a
[108420.352003] [<ffffffff81045e19>] ? process_one_work+0x30a/0x30a
[108420.352003] [<ffffffff810496cf>] ? kthread+0x81/0x89
[108420.352003] [<ffffffff81350174>] ? kernel_thread_helper+0x4/0x10
[108420.352003] [<ffffffff8104964e>] ? kthread_freezable_should_stop+0x4e/0x4e
[108420.352003] [<ffffffff81350170>] ? gs_change+0xb/0xb
[108420.352003] Code: 66 39 d0 0f 94 c0 0f b6 c0 c3 fa b8 00 01 00 00 f0 66 0f c1 07 88 c2 66 c1 e8 08 38 c2 74 06 f3 90 8a 17 eb f6 c3 80 07 01 56 9d <c3> 83 ca ff f0 0f c1 17 b8 01 00 00 00 ff ca 79 05 f0 ff 07 30
[108448.348033] BUG: soft lockup - CPU#6 stuck for 22s! [kworker/6:0:30692]
[108448.352003] Modules linked in: nfsv4 autofs4 ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat ebtables x_tables rpcsec_gss_krb5 ipv6 nfsd nfs_acl auth_rpcgss nfs lockd sunrpc dm_round_robin dm_multipath ipmi_devintf ipmi_si ipmi_msghandler sg evdev acpi_cpufreq freq_table serio_raw mperf processor button thermal_sys coretemp kvm_intel kvm lpc_ich ioatdma mfd_core tpm_tis i2c_i801 tpm microcode tpm_bios rng_core i2c_core i5k_amb dca ses enclosure ata_generic lpfc ata_piix scsi_transport_fc scsi_tgt
[108448.352003] CPU 6
[108448.352003] Pid: 30692, comm: kworker/6:0 Not tainted 3.6.0 #5 Intel S5000PAL./S5000PAL0
[108448.352003] RIP: 0010:[<ffffffff8134e744>] [<ffffffff8134e744>] _raw_spin_unlock_irqrestore+0x5/0x6
[108448.352003] RSP: 0018:ffff8802563a7d98 EFLAGS: 00000286
[108448.352003] RAX: ffff88024e975000 RBX: 00000000000000a2 RCX: 0000000000000087
[108448.352003] RDX: 0000000000000087 RSI: 0000000000000286 RDI: ffff88024e975050
[108448.352003] RBP: ffff88024e975000 R08: 0000000000000000 R09: ffffffff8166f890
[108448.352003] R10: ffff88024e975000 R11: ffffffffa00d6bf0 R12: 0000000000000000
[108448.352003] R13: ffffffff8166f890 R14: ffff88024e975000 R15: ffffffffa00d6bf0
[108448.352003] FS: 0000000000000000(0000) GS:ffff88025fd80000(0000) knlGS:0000000000000000
[108448.352003] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[108448.352003] CR2: 00007f5b5dec6070 CR3: 000000024f0eb000 CR4: 00000000000007e0
[108448.352003] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[108448.352003] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[108448.352003] Process kworker/6:0 (pid: 30692, threadinfo ffff8802563a6000, task ffff880252f32a10)
[108448.352003] Stack:
[108448.352003] ffffffff8125a498 ffff88025fd8d080 0000000000000286 ffffffffa0015c28
[108448.352003] ffff88024d1207c0 ffff88025fd8d080 ffff88025fd98100 ffffffffa0015c28
[108448.352003] 0000000000000000 ffff88024f22abd8 ffffffff81045d07 0000000000012240
[108448.352003] Call Trace:
[108448.352003] [<ffffffff8125a498>] ? scsi_remove_target+0x138/0x154
[108448.352003] [<ffffffffa0015c28>] ? store_fc_host_system_hostname+0x66/0x66 [scsi_transport_fc]
[108448.352003] [<ffffffffa0015c28>] ? store_fc_host_system_hostname+0x66/0x66 [scsi_transport_fc]
[108448.352003] [<ffffffff81045d07>] ? process_one_work+0x1f8/0x30a
[108448.352003] [<ffffffff81046034>] ? worker_thread+0x21b/0x314
[108448.352003] [<ffffffff81045e19>] ? process_one_work+0x30a/0x30a
[108448.352003] [<ffffffff81045e19>] ? process_one_work+0x30a/0x30a
[108448.352003] [<ffffffff810496cf>] ? kthread+0x81/0x89
[108448.352003] [<ffffffff81350174>] ? kernel_thread_helper+0x4/0x10
[108448.352003] [<ffffffff8104964e>] ? kthread_freezable_should_stop+0x4e/0x4e
[108448.352003] [<ffffffff81350170>] ? gs_change+0xb/0xb
[108448.352003] Code: 66 39 d0 0f 94 c0 0f b6 c0 c3 fa b8 00 01 00 00 f0 66 0f c1 07 88 c2 66 c1 e8 08 38 c2 74 06 f3 90 8a 17 eb f6 c3 80 07 01 56 9d <c3> 83 ca ff f0 0f c1 17 b8 01 00 00 00 ff ca 79 05 f0 ff 07 30

J.

--
101 things you can't have too | .''`. Debian GNU/Linux Developer
much of : 28 - Sunshine. | : :' : Happy to accept PGP signed
| `. `' or encrypted mail - RSA
| `- key on the keyservers.


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