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Date: Fri, 4 Jul 2014 01:32:50 -0400
From: Joe Lawrence <joe.lawrence@stratus.com>
To: <linux-kernel@vger.kernel.org>
CC: Joe Julian <joe@julianfamily.org>, Joe Lawrence <joe.lawrence@stratus.com>
Subject: RE: mpt2sas stuck installing
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On Thu, Jul 3 2014 Joe Julian wrote:

> I have a knox enclosure with an unresponsive drive. When the mpt2sas 
> module is loaded the module loading process hangs. modprobe/insmod is 
> stuck and any further attempts to load modules also hang. By 
> blacklisting the module and loading it last, I can get the computer to 
> boot, but attempting to manually load the module will still hang. When I 
> shut down, I get the following:
> 
> [55473.508343] mpt2sas1: _config_request: timeout
> [55474.510395] BUG: unable to handle kernel paging request at ffffc90020ae0000
> [55474.513048] IP: [<ffffffffa03c00f0>] mpt2sas_base_get_iocstate+0x10/0x30 [mpt2sas]
> [55474.525196] PGD 103f80c067 PUD 203f003067 PMD 1026dca067 PTE 0
> [55474.526115] Oops: 0000 [#1] SMP
> [55474.527837] Modules linked in: raid456 async_pq async_xor xor async_memcpy async_raid6_recov raid6_pq async_tx ses enclosure mpt2sas raid_class rdma_ucm ib_ucm rdma_cm iw_cm ib_addr ib_ipoib ib_cm ib_uverbs ib_umad mlx4_en mlx4_ib(-) ib_sa ib_mad ib_core coretemp mlx4_core kvm_intel kvm 8021q garp stp ghash_clmulni_intel llc aesni_intel ablk_helper cryptd nfsd lrw aes_x86_64 xts psmouse gf128mul sb_edac nfs_acl auth_rpcgss edac_core mei microcode serio_raw mac_hid lp lpc_ich nfs fscache parport lockd sunrpc ext2 isci libsas ahci libahci e1000e scsi_transport_sas [last unloaded: mlx4_core]
> [55474.538831] CPU 2
> [55474.539218] Pid: 3516, comm: scsi_eh_10 Not tainted 3.8.0-38-generic #56~precise1-Ubuntu Quanta F03R /Winterfell
> [55474.541004] RIP: 0010:[<ffffffffa03c00f0>] [<ffffffffa03c00f0>] mpt2sas_base_get_iocstate+0x10/0x30 [mpt2sas]
> [55474.542772] RSP: 0018:ffff881019a39ae8  EFLAGS: 00010246
> [55474.543590] RAX: ffffc90020ae0000 RBX: ffff88100fd1e6b0 RCX: 0000000000000000
> [55474.546285] RDX: ffff881019a39fd8 RSI: 0000000000000001 RDI: ffff88100fd1e6b0
> [55474.548451] RBP: ffff881019a39ae8 R08: 0000000000000000 R09: 0000000000000000
> [55474.549585] R10: 00000000000007db R11: 00000000000007da R12: 0000000000000001
> [55474.550689] R13: ffff881019a39bbc R14: 000000000000ffff R15: ffff881019a39c80
> [55474.551791] FS:  0000000000000000(0000) GS:ffff88103fc40000(0000) knlGS:0000000000000000
> [55474.553044] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [55474.553928] CR2: ffffc90020ae0000 CR3: 0000000001c0d000 CR4: 00000000000407e0
> [55474.555187] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [55474.557030] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [55474.558139] Process scsi_eh_10 (pid: 3516, threadinfo ffff881019a38000, task ffff8810257b5d00)
> [55474.560748] Stack:
> [55474.561069]  ffff881019a39b98 ffffffffa03c183a 0000000000000006 0000000000000006
> [55474.562218]  ffff88100fd1eb00 ffff88100fd1eaf8 ffff88100fd1e6d0 0000000000000000
> [55474.563343]  ffff881019a30000 ffffffff8105b3ea ffff88100fd1ead8 0000000000000000
> [55474.564595] Call Trace:
> [55474.565003]  [<ffffffffa03c183a>] _config_request.constprop.5+0x15a/0x590 [mpt2sas]
> [55474.568223]  [<ffffffff8105b3ea>] ? console_unlock+0x1a/0x30
> [55474.569896]  [<ffffffffa03c2a3a>] mpt2sas_config_get_expander_pg0+0x8a/0xf0 [mpt2sas]
> [55474.571322]  [<ffffffffa03c589c>] _scsih_search_responding_expanders+0x5c/0xe0 [mpt2sas]
> [55474.572582]  [<ffffffffa03c4599>] ?  _scsih_search_responding_sas_devices+0xa9/0xc0 [mpt2sas]
> [55474.573912]  [<ffffffffa03cd43e>] mpt2sas_scsih_reset_handler+0xbe/0x1a0 [mpt2sas]
> [55474.575191]  [<ffffffffa03bf91f>] _base_reset_handler+0x1f/0x40 [mpt2sas]
> [55474.576250]  [<ffffffffa03c0d9e>] mpt2sas_base_hard_reset_handler+0x1ae/0x1e0 [mpt2sas]
> [55474.577500]  [<ffffffffa03c499c>] _scsih_host_reset+0x5c/0xb0 [mpt2sas]
> [55474.578554]  [<ffffffff814ac2f3>] scsi_try_host_reset+0x53/0x110
> [55474.579729]  [<ffffffff814adbbc>] scsi_eh_host_reset+0x4c/0x170
> [55474.580764]  [<ffffffff814ae532>] scsi_eh_ready_devs+0x82/0xa0
> [55474.581866]  [<ffffffff814aef2d>] scsi_unjam_host+0xed/0x1d0
> [55474.584848]  [<ffffffff814af175>] scsi_error_handler+0x165/0x1c0
> [55474.585984]  [<ffffffff814af010>] ? scsi_unjam_host+0x1d0/0x1d0
> [55474.592375]  [<ffffffff8107f2e0>] kthread+0xc0/0xd0
> [55474.594325]  [<ffffffff8107f220>] ? flush_kthread_worker+0xb0/0xb0
> [55474.595654]  [<ffffffff816ff1ac>] ret_from_fork+0x7c/0xb0
> [55474.598729]  [<ffffffff8107f220>] ? flush_kthread_worker+0xb0/0xb0
> [55474.607501] Code: c7 c2 f8 7d 3d a0 48 c7 c7 52 ac 3d a0 31 c0 e8 f1 de 31 e1 e9 f6 fe ff ff 66 90 66 66 66 66 90 55 48 8b 87 88 00 00 00 48 89 e5 <8b> 00 89 c2 81 e2 00 00 00 f0 85 f6 0f 45 c2 5d c3 66 66 66 66
> [55474.611823] RIP  [<ffffffffa03c00f0>] mpt2sas_base_get_iocstate+0x10/0x30 [mpt2sas]
> [55474.613007]  RSP <ffff881019a39ae8>
> [55474.613548] CR2: ffffc90020ae0000
> [55474.614183] ---[ end trace a817d8e30eb9f07c ]---

Hi Joe,

I was investigating a crash inside mpt2sas_base_get_iocstate just
earlier today.  In my case, it appeared that ioc->chip had been cleared
when mpt2sas_base_get_iocstate tried to reference through it.  This was
with a newer kernel on RHEL7, but it also occured early in
mpt2sas_base_get_iocstate and EAX held the bogo address.

A few follow up questions:

Do you happen to have kdump enabled?
Were there any other interesting log messages after loading the driver?
Is this crash easily reproducible?

Regards,

-- Joe
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