------------[ 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 ]---
Created attachment 919048 [details] dmesg 3.16.0-0.rc5.git0.1.fc21.x86_64 - WARNING mm/slab_common.c:69 kmem_cache_create
Overall it was a good fight.
"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.
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