[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1186473
Title:
Kernel panic with two USB3 HDD: ring_doorbell_for_active_rings
Status in “linux” package in Ubuntu:
Expired
Bug description:
See attached photo of the screen after the panic.
This kernel panic occurred using Dmedia with two USB3 HDD connected.
Both drives contained Dmedia FileStores, and this happened during
Dmedia's background tasks. I can reliably trigger this panic with
Dmedia (usually happens within an hour or so), but I haven't
encountered this when Dmedia isn't running, when I'm just browsing
through the drives with Nautilus or somesuch.
Also interesting is this seems only to occur when *two* USB3 HDD are
connected. With only one USB3 HDD connected, I haven't experienced
this yet, even when Dmedia is running.
I have a few theories as to why Dmedia can trigger this but other apps
don't seem to. For one, Dmedia has unusually high IO throughput.
During its many background tasks, Dmedia will do very fast sequential
reads through large files, and can generally keep the read IO almost
fully saturated. Dmedia was definitely doing such a read from one
drive when this happened, and was possibly writing a file to the other
drive at the same time.
The other perhaps unusual thing is Dmedia uses posix_fadvise() with
POSIX_FADV_WILLNEED, which is a big part of how it achieves such fast
reads. After Dmedia reads an 8 MiB chunk, it immediately calls
posix_fadvise() to hint its read intent to the kernel, like so:
Py_BEGIN_ALLOW_THREADS
n = read(fd, PyBytes_AS_STRING(buffer), size);
if (n == size) {
offset = (off_t) (index + 1) * size;
res = posix_fadvise(fd, offset, (off_t) size, POSIX_FADV_WILLNEED);
}
Py_END_ALLOW_THREADS
Above from the filestore_fastread() function:
http://bazaar.launchpad.net/~dmedia/filestore/trunk/view/head:/_filestore.c#L48
I don't have experience with this sort of kernel debugging, so I'm not
sure how to get more information after the panic (system isn't usable
at all). Suggestions welcome =)
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-3.8.0-23-generic 3.8.0-23.34
ProcVersionSignature: Ubuntu 3.8.0-23.34-generic 3.8.11
Uname: Linux 3.8.0-23-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: jderose 2370 F.... pulseaudio
Date: Fri May 31 19:56:21 2013
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-03-11 (81 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130310)
MachineType: System76, Inc. Gazelle Professional
MarkForUpload: True
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-23-generic
root=UUID=c2975d9e-7759-42b0-a550-8a34f8a6964f ro quiet splash
acpi_os_name=Linux acpi_osi= vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.8.0-23-generic N/A
linux-backports-modules-3.8.0-23-generic N/A
linux-firmware 1.106
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/16/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.5
dmi.board.asset.tag: Tag 12345
dmi.board.name: Gazelle Professional
dmi.board.vendor: System76, Inc.
dmi.board.version: gazp7
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd05/16/2012:svnSystem76,Inc.:pnGazelleProfessional:pvrgazp7:rvnSystem76,Inc.:rnGazelleProfessional:rvrgazp7:cvnNoEnclosure:ct9:cvrN/A:
dmi.product.name: Gazelle Professional
dmi.product.version: gazp7
dmi.sys.vendor: System76, Inc.
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