linux-kernel - kmalloc warning in mlx4_buddy

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Date:	Wed, 15 May 2013 03:23:49 -0500
From:	Robin Holt <holt@....com>
To:	Roland Dreier <roland@...estorage.com>
Cc:	linux-kernel@...r.kernel.org, Robin Holt <holt@....com>
Subject: kmalloc warning in mlx4_buddy_init.

Roland,

We are seeing the following when booting on a large system.

[  171.399023] mlx4_core 0004:01:00.0: irq 2410 for MSI/MSI-X
[  171.406560] ------------[ cut here ]------------
[  171.411734] WARNING: at mm/slab_common.c:376 kmalloc_slab+0x71/0x90()
[  171.418919] Modules linked in: mlx4_core(+) sg lpc_ich mfd_core shpchp pci_hotplug ehci_pci ehci_hcd ioatdma i2c_i801 igb dca i2c_algo_bit i2c_core ptp pps_core mperf processor thermal_sys hwmon usbcore usb_common ext4 jbd2 crc16 sd_mod crc_t10dif qla2xxx scsi_transport_fc scsi_tgt megaraid_sas ahci libahci isci libsas libata scsi_transport_sas scsi_mod button dm_mirror dm_region_hash dm_log dm_mod gru(O) xvma(O)
[  171.460377] CPU: 48 PID: 2561 Comm: kworker/48:1 Tainted: G        W  O 3.10.0-rc1-uv-hz100-rja+ #3
[  171.470473] Hardware name: SGI UV2000/ROMLEY, BIOS SGI UV 2000/3000 series BIOS 01/15/2013
[  171.479720] Workqueue: events work_for_cpu_fn
[  171.484597]  0000000000000178 ffff8867bb0f5ba8 ffffffff814a873c ffff8867bb0f5be8
[  171.492897]  ffffffff81045a7b 000080d0000080d0 0000000000200000 ffff88679bc7cb80
[  171.501205]  0000000000000000 00000000000082d0 0000000000000000 ffff8867bb0f5bf8
[  171.509502] Call Trace:
[  171.512266]  [<ffffffff814a873c>] dump_stack+0x19/0x1d
[  171.518007]  [<ffffffff81045a7b>] warn_slowpath_common+0x6b/0xa0
[  171.524711]  [<ffffffff81045ac5>] warn_slowpath_null+0x15/0x20
[  171.531230]  [<ffffffff811258c1>] kmalloc_slab+0x71/0x90
[  171.537176]  [<ffffffff81152e10>] __kmalloc+0x30/0x220
[  171.542989]  [<ffffffffa03a9f4b>] ? mlx4_buddy_init+0xdb/0x1d0 [mlx4_core]
[  171.550699]  [<ffffffffa03a9f4b>] mlx4_buddy_init+0xdb/0x1d0 [mlx4_core]
[  171.558183]  [<ffffffffa03aa0ef>] mlx4_init_mr_table+0xaf/0x130 [mlx4_core]
[  171.565964]  [<ffffffffa03a3c48>] mlx4_setup_hca+0x158/0x5a0 [mlx4_core]
[  171.573446]  [<ffffffffa03a5b90>] __mlx4_init_one+0x720/0x9c0 [mlx4_core]
[  171.581030]  [<ffffffffa03a5e7c>] mlx4_init_one+0x2c/0x60 [mlx4_core]
[  171.588232]  [<ffffffff8128c599>] local_pci_probe+0x49/0x80
[  171.594458]  [<ffffffff810606f3>] work_for_cpu_fn+0x13/0x20
[  171.600692]  [<ffffffff81064114>] process_one_work+0x194/0x3d0
[  171.607200]  [<ffffffff81065464>] worker_thread+0x2c4/0x410
[  171.613421]  [<ffffffff810651a0>] ? manage_workers+0x190/0x190
[  171.619940]  [<ffffffff8106aee6>] kthread+0xc6/0xd0
[  171.625392]  [<ffffffff8106ae20>] ? kthread_freezable_should_stop+0x70/0x70
[  171.633182]  [<ffffffff814b42ec>] ret_from_fork+0x7c/0xb0
[  171.639204]  [<ffffffff8106ae20>] ? kthread_freezable_should_stop+0x70/0x70
[  171.646976] ---[ end trace 822f6d487f108023 ]---
[  171.715920] mlx4_core 0004:01:00.0: command 0xc failed: fw status = 0x40
[  171.723888] mlx4_core: Initializing 0007:02:00.0

This looks to be a kmalloc larger than MAX_ORDER.  Not sure which of the two
kcallocs in mlx4_buddy_init.

Thanks,
Robin Holt
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