Re: [systemd-devel] BTRFS bug with parallel mounts?
On Thu, 11 Nov 2010 06:53:31 -0200 Gustavo Sverzut Barbieri barbi...@profusion.mobi wrote: On Thursday, November 11, 2010, Mike Kazantsev mk.frag...@gmail.com wrote: I thought about reporting the issue when I've encountered it, but been a bit busy adapting the system for systemd, so it kina slipped off my mind. Guess I'll get all these traces, clean my vm from possible private stuff (I rsync it from a real machine) and report the setup to btrfs maintainers in a few days. Thanks for reminder! ;) I'd appreciate it as I'm going into a business trip without much spare time do do dev/testing. If possible, add me as mail/bugzilla CC I've raised the issue on linux-btrfs ML (added you to CC as well): http://thread.gmane.org/gmane.comp.file-systems.btrfs/7515 -- Mike Kazantsev // fraggod.net signature.asc Description: PGP signature ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] BTRFS bug with parallel mounts?
On Thursday, November 11, 2010, Mike Kazantsev mk.frag...@gmail.com wrote: On Wed, 10 Nov 2010 15:52:51 -0200 Gustavo Sverzut Barbieri barbi...@profusion.mobi wrote: On Wed, Nov 10, 2010 at 2:11 PM, Greg KH g...@kroah.com wrote: On Wed, Nov 10, 2010 at 01:02:51PM -0200, Gustavo Sverzut Barbieri wrote: On Wed, Nov 10, 2010 at 9:33 AM, Gustavo Sverzut Barbieri Part of the log (sorry, I had no way but to type it all): BUG: unable to handle kernel NULL pointer dereference at 0128 IP: [811329fb] btrfs_test_super+0xb/0x30 PGD: 26b5b1067 PUD 26a465067 PMD 0 last sysfs file: /sys/devices/virtual/bdi/btrfs-2/uevent CPU 0 Modules linked in: nvidia(P) lib80211_crypt_tkip wl(P) Pid: 434, comm: mount Tainted: P 2.6.36 #3 Mac-F22586C8/MacBookPro6,2 RIP: ... btrfs_test_super+0xb/0x30 Sounds like a btrfs issue, have you contacted those developers? No, I just mailed systemd as people (kay?) seems to be using it, at least I saw people here advertising its usage, even the readahead have specific code, so maybe people had (or not) issues with it. Let's face that mounting multiple points simultaneously is not what one would expect. Also, you really are going to have to be able to reproduce this without the closed source kernel modules linked in (broadcom and nvidia) for anyone to even be able to help you out. yeah, I'm pretty sure about that ;-) I can reliably reproduce the issue on my hardware and similar vm setup with several btrfs mounts, activated during boot. Kernel spits some backtrace into terminal, then, after a few seconds it enters some kind of crazy endless error-loop, flooding terminal with more backtraces. Vanilla 2.6.36 kernel, no proprietary code. Since none of these mounts are critical to boot (I didn't trust btrfs much at the time), I've worked around the issue by comment=systemd.automount, so they got mounted after boot with systemd. I thought about reporting the issue when I've encountered it, but been a bit busy adapting the system for systemd, so it kina slipped off my mind. Guess I'll get all these traces, clean my vm from possible private stuff (I rsync it from a real machine) and report the setup to btrfs maintainers in a few days. Thanks for reminder! ;) I'd appreciate it as I'm going into a business trip without much spare time do do dev/testing. If possible, add me as mail/bugzilla CC -- Gustavo Sverzut Barbieri http://profusion.mobi embedded systems -- MSN: barbi...@gmail.com Skype: gsbarbieri Mobile: +55 (19) 9225-2202 ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] BTRFS bug with parallel mounts?
On Wed, 10 Nov 2010 15:52:51 -0200 Gustavo Sverzut Barbieri barbi...@profusion.mobi wrote: On Wed, Nov 10, 2010 at 2:11 PM, Greg KH g...@kroah.com wrote: On Wed, Nov 10, 2010 at 01:02:51PM -0200, Gustavo Sverzut Barbieri wrote: On Wed, Nov 10, 2010 at 9:33 AM, Gustavo Sverzut Barbieri Part of the log (sorry, I had no way but to type it all): BUG: unable to handle kernel NULL pointer dereference at 0128 IP: [811329fb] btrfs_test_super+0xb/0x30 PGD: 26b5b1067 PUD 26a465067 PMD 0 last sysfs file: /sys/devices/virtual/bdi/btrfs-2/uevent CPU 0 Modules linked in: nvidia(P) lib80211_crypt_tkip wl(P) Pid: 434, comm: mount Tainted: P 2.6.36 #3 Mac-F22586C8/MacBookPro6,2 RIP: ... btrfs_test_super+0xb/0x30 Sounds like a btrfs issue, have you contacted those developers? No, I just mailed systemd as people (kay?) seems to be using it, at least I saw people here advertising its usage, even the readahead have specific code, so maybe people had (or not) issues with it. Let's face that mounting multiple points simultaneously is not what one would expect. Also, you really are going to have to be able to reproduce this without the closed source kernel modules linked in (broadcom and nvidia) for anyone to even be able to help you out. yeah, I'm pretty sure about that ;-) I can reliably reproduce the issue on my hardware and similar vm setup with several btrfs mounts, activated during boot. Kernel spits some backtrace into terminal, then, after a few seconds it enters some kind of crazy endless error-loop, flooding terminal with more backtraces. Vanilla 2.6.36 kernel, no proprietary code. Since none of these mounts are critical to boot (I didn't trust btrfs much at the time), I've worked around the issue by comment=systemd.automount, so they got mounted after boot with systemd. I thought about reporting the issue when I've encountered it, but been a bit busy adapting the system for systemd, so it kina slipped off my mind. Guess I'll get all these traces, clean my vm from possible private stuff (I rsync it from a real machine) and report the setup to btrfs maintainers in a few days. Thanks for reminder! ;) -- Mike Kazantsev // fraggod.net signature.asc Description: PGP signature ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
