Messages in this thread | | | Date | Mon, 25 May 2009 15:45:22 +0200 | From | Richard Atterer <> | Subject | Re: [Bug #13371] s2disk hangs with kernel 2.6.29 and later, SATA, Gigabyte EG45M-DS2H |
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Hello,
this bug is still present, but so far (despite lots of useful help by Bartlomiej) I have been unable to bisect the issue.
We took some of the discussion off-list - here is a summary, with some new results at the end:
* I originally bisected the bug and identified this patch as the culprit: 295f00042aaf6b553b5f37348f89bab463d4a469: ide: don't execute the next queued command from the hard-IRQ context (v2)
* The fix for 295f000 (2ea5521: ide: fix suspend regression) did not fix my problem either.
* After some mails, I switched to CONFIG_IDE=n in the config I use for testing (was CONFIG_IDE=m before), because the problem still occurred in that case. The result of this: 295f000 (ide: don't execute the next queued command from the hard-IRQ context (v2)): ***Works*** with CONFIG_IDE=n 2ea5521 (ide: fix suspend regression): Hangs with CONFIG_IDE=n 1406de8 (2.6.30-rc6): Hangs with CONFIG_IDE=n
I also disconnected my second (PATA) disk at that point, since it does not influence the bug. So my system is SATA-only, both the (single) hard disk and my DVD writer are SATA.
* I bisected 295f000..2ea5521 and ended up at this as the first bad commit: 9ea09af3bd3090e8349ca2899ca2011bd94cda85: stop_machine: introduce stop_machine_create/destroy. This turns out to be a bug that was fixed by a0e280e0f33f6c859a235fb69a875ed8f3420388: stop_machine/cpu hotplug: fix disable_nonboot_cpus
* a0e280e worked for me, so (with increasing grumpiness;) I bisected a0e280e..2ea5521. This bisect didn't work, I ended up with a reported "bad" commit which was clearly not the problem. The configs and bisect log are at <http://atterer.net/s2disk-config/> The bisect log lines with "OK" mean that I went back and booted the kernel a second time, to make sure I hadn't mixed something up. But the second tries all had the same result as the first.
* Bart analysed that part of the history and suggested trying out 73d5931, and if that worked, bisecting 73d5931..2ea5521.
Today I re-tried both 73d5931 and 2ea5521, and it turns out that in both cases, s2disk hangs. :-|
By chance, I noticed that the behaviour during the hang is different from what I reported before, at least with these two versions. Initially, I said that the system would hang after the "s2disk: Snapshotting system" with a blinking cursor. It turns out that actually it hangs for quite a while (maybe 2 minutes?) and only then starts to perform the s2disk!! The last lines written are "s2disk: Compression ratio 0.24" or similar, and then a line containing just "S¦". Afterwards, the system does *not* power off as it usually does, but just seems to hang again. (I think I waited for a few minutes, but nothing happened.)
Since the last, third bisect did not work, I'm at a loss what to try next.
Cheers,
Richard
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