[Bug 779490] New: kernel hangs in mnt_want_write / __sb_start_write
https://bugzilla.novell.com/show_bug.cgi?id=779490 https://bugzilla.novell.com/show_bug.cgi?id=779490#c0 Summary: kernel hangs in mnt_want_write / __sb_start_write Classification: openSUSE Product: openSUSE 12.2 Version: Final Platform: Other OS/Version: Other Status: NEW Severity: Normal Priority: P5 - None Component: Kernel AssignedTo: kernel-maintainers@forge.provo.novell.com ReportedBy: dmueller@suse.com QAContact: qa-bugs@suse.de Found By: --- Blocker: --- Created an attachment (id=504985) --> (http://bugzilla.novell.com/attachment.cgi?id=504985) dmesg output Hi, since the switch to 3.6.rcX I'm experiencing frequent hangs of processes in mnt_want_write / __sb_start_write. It does not seem to occur in kernel-vanilla it seems, although that might have been luck. It takes a few days until it happens, but it happens regularly. Attached is the dmesg output -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
https://bugzilla.novell.com/show_bug.cgi?id=779490 https://bugzilla.novell.com/show_bug.cgi?id=779490#c Dirk Mueller <dmueller@suse.com> changed: What |Removed |Added ---------------------------------------------------------------------------- AssignedTo|kernel-maintainers@forge.pr |jack@suse.com |ovo.novell.com | -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
https://bugzilla.novell.com/show_bug.cgi?id=779490 https://bugzilla.novell.com/show_bug.cgi?id=779490#c1 Jan Kara <jack@suse.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |NEEDINFO InfoProvider| |dmueller@suse.com --- Comment #1 from Jan Kara <jack@suse.com> 2012-09-10 09:43:33 UTC --- Interesting. So everyone is waiting for filesystem to be unfrozen. I'm somewhat surprised you are using filesystem freezing. Do you know what uses it and how? -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
https://bugzilla.novell.com/show_bug.cgi?id=779490 https://bugzilla.novell.com/show_bug.cgi?id=779490#c2 Dirk Mueller <dmueller@suse.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEEDINFO |NEW InfoProvider|dmueller@suse.com | --- Comment #2 from Dirk Mueller <dmueller@suse.com> 2012-09-10 13:36:48 CEST --- I'm not using it actively. either some autobuild job goes berzerk or there is a bug somewhere. any idea how to track/debug this? -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
https://bugzilla.novell.com/show_bug.cgi?id=779490 https://bugzilla.novell.com/show_bug.cgi?id=779490#c3 Jan Kara <jack@suse.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |NEEDINFO InfoProvider| |dmueller@suse.com --- Comment #3 from Jan Kara <jack@suse.com> 2012-09-13 21:10:59 UTC --- So let's try the following: 1) Install and boot -trace flavor of the kernel. 2) echo "freeze_super thaw_super" >/sys/kernel/debug/tracing/set_ftrace_filter 3) echo "function" >/sys/kernel/debug/tracing/current_tracer 4) echo 1 >/sys/kernel/debug/tracing/tracing_on 5) cat /sys/kernel/debug/tracing/trace_pipe | tee /tmp/freeze_calls.txt Watch processes calling freeze_super() and thaw_super(). They should be paired... Also attach /tmp/freeze_calls.txt here. Thanks. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
https://bugzilla.novell.com/show_bug.cgi?id=779490 https://bugzilla.novell.com/show_bug.cgi?id=779490#c Jan Kara <jack@suse.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Priority|P5 - None |P3 - Medium -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
https://bugzilla.novell.com/show_bug.cgi?id=779490 https://bugzilla.novell.com/show_bug.cgi?id=779490#c4 --- Comment #4 from Dirk Mueller <dmueller@suse.com> 2012-09-26 12:05:14 CEST --- it appeared again.. now rebooted into kernel-trace, lets see if I can trigger it. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
https://bugzilla.novell.com/show_bug.cgi?id=779490 https://bugzilla.novell.com/show_bug.cgi?id=779490#c5 --- Comment #5 from Dirk Mueller <dmueller@suse.com> 2012-10-12 16:04:30 CEST --- It seems it was caused by a build job running xfs_io freeze and then dieing :/ -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
https://bugzilla.novell.com/show_bug.cgi?id=779490 https://bugzilla.novell.com/show_bug.cgi?id=779490#c6 Jan Kara <jack@suse.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEEDINFO |RESOLVED InfoProvider|dmueller@suse.com | Resolution| |INVALID --- Comment #6 from Jan Kara <jack@suse.com> 2012-10-16 08:52:56 UTC --- OK, that would demonstrate exactly like what you observed. So let's close this as invalid and please reopen the bug if you find some new information pointing to a kernel bug. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
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