Bug 1121092

Summary: WARNING: CPU: 1 PID: 495 at mm/slab_common.c:69 kmem_cache_create+0x1a9/0x330()
Product: [Fedora] Fedora Reporter: poma <pomidorabelisima>
Component: kernelAssignee: Kernel Maintainer List <kernel-maint>
Status: CLOSED UPSTREAM QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: rawhideCC: emilne, gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda, mchehab, msnitzer, pbonzini
Target Milestone: ---Keywords: Reopened
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2014-08-09 08:29:53 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
dmesg 3.16.0-0.rc5.git0.1.fc21.x86_64 - WARNING mm/slab_common.c:69 kmem_cache_create none

Description poma 2014-07-18 10:46:02 UTC 
------------[ cut here ]------------
WARNING: CPU: 1 PID: 495 at mm/slab_common.c:69 kmem_cache_create+0x1a9/0x330()
Modules linked in: virtio_net virtio_scsi(+) drm virtio_pci i2c_core virtio_ring ata_generic pata_acpi virtio sunrpc dm_crypt dm_round_robin linear raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor xor async_tx raid6_pq raid1 raid0 iscsi_ibft iscsi_boot_sysfs floppy iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi squashfs cramfs edd dm_multipath
CPU: 1 PID: 495 Comm: systemd-udevd Not tainted 3.16.0-0.rc5.git0.1.fc21.x86_64 #1
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
 0000000000000000 00000000bfd3b05a ffff88007f55fa40 ffffffff8171b4e3
 0000000000000000 ffff88007f55fa78 ffffffff8108f30d ffff880079175d40
 ffff88007f55ffd8 ffffffff81c6de08 ffff88007f55ffd8 ffff88007f55ffd8
Call Trace:
 [<ffffffff8171b4e3>] dump_stack+0x45/0x56
 [<ffffffff8108f30d>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff8108f43a>] warn_slowpath_null+0x1a/0x20
 [<ffffffff811a7c59>] kmem_cache_create+0x1a9/0x330
 [<ffffffff814a4070>] scsi_setup_command_freelist+0x120/0x270
 [<ffffffff814a4d90>] scsi_add_host_with_dma+0x60/0x2b0
 [<ffffffffa017b9c9>] virtscsi_probe+0x269/0x2af [virtio_scsi]
 [<ffffffffa01877c0>] ? vp_reset+0x90/0x90 [virtio_pci]
 [<ffffffffa010e1d9>] virtio_dev_probe+0xe9/0x160 [virtio]
 [<ffffffff81483d83>] driver_probe_device+0xa3/0x400
 [<ffffffff814841ab>] __driver_attach+0x8b/0x90
 [<ffffffff81484120>] ? __device_attach+0x40/0x40
 [<ffffffff81481b23>] bus_for_each_dev+0x73/0xc0
 [<ffffffff8148381e>] driver_attach+0x1e/0x20
 [<ffffffff814833f0>] bus_add_driver+0x180/0x250
 [<ffffffffa0180000>] ? 0xffffffffa017ffff
 [<ffffffff81484974>] driver_register+0x64/0xf0
 [<ffffffffa010e550>] register_virtio_driver+0x20/0x40 [virtio]
 [<ffffffffa0180085>] init+0x85/0x1000 [virtio_scsi]
 [<ffffffff81002148>] do_one_initcall+0xd8/0x210
 [<ffffffff811c3952>] ? __vunmap+0xa2/0x100
 [<ffffffff8110d951>] load_module+0x2061/0x2600
 [<ffffffff811092f0>] ? store_uevent+0x70/0x70
 [<ffffffff8110dfbd>] SyS_init_module+0xcd/0x120
 [<ffffffff817223a9>] system_call_fastpath+0x16/0x1b
---[ end trace 64d7cf025fd3bf4a ]---
Comment 1 poma 2014-07-18 10:47:59 UTC 
Created attachment 919048 [details]
dmesg 3.16.0-0.rc5.git0.1.fc21.x86_64 - WARNING mm/slab_common.c:69 kmem_cache_create
Comment 2 poma 2014-07-22 07:55:34 UTC 
Overall it was a good fight.
Comment 3 poma 2014-07-29 23:33:17 UTC 
"scsi: use short driver name for per-driver cmd slab caches"
http://git.infradead.org/users/hch/scsi-queue.git/commitdiff/884ffee?hp=16acf5d
http://git.infradead.org/users/hch/scsi-queue.git/patch/884ffee?hp=16acf5d

Josh, I leave you to decide whether to apply this on the 3.16 or wait for the 3.17.
Comment 4 poma 2014-08-12 07:41:54 UTC 
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/scsi/scsi.c?id=884ffee
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/scsi/scsi.c?id=884ffee#n368
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/tree/drivers/scsi/scsi.c#n368
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/tree/drivers/scsi/scsi.c?id=refs/tags/next-20140812#n368