On 10/24/2012 02:49 PM, Nix wrote: > On 24 Oct 2012, Theodore Ts'o spake thusly: >> Toralf, Nix, if you could try applying this patch (at the end of this >> message), and let me know how and when the WARN_ON triggers, and if it >> does, please send the empty_bug_workaround plus the WARN_ON(1) report. >> I know about the case where a file system is mounted and then >> immediately unmounted, but we don't think that's the problematic case. >> If you see any other cases where WARN_ON is triggering, it would be >> really good to know.... > > Confirmed, it triggers. Traceback below. > <giant snip> The warn on triggers, but I can't tell - did the corruption still occur with Ted's patch? -Eric > > OK. That umount of local filesystems sprayed your added > empty bug workaround and WARN_ONs so many times that nearly all of them > scrolled off the screen -- and because syslogd was dead by now and this > is where my netconsole logs go, they're lost. I suspect every single > umounted filesystem sprayed one of these (and this happened long before > any reboot-before-we're-done). > > But I did the old trick of camera-capturing the last one (which was > probably /boot, which has never got corrupted because I hardly ever > write anything to it at all). I hope it's more useful than nothing. (I > can rearrange things to umount /var last, and try again, if you think > that a specific warning from an fs known to get corrupted is especially > likely to be valuable.) > > So I see, for one umount at least (and the chunk of the previous one > that scrolled offscreen is consistent with this): > > jbd2_mark_journal_empty bug workaround (21218, 21219) > [obscured by light] at fs/jbd2/journal.c:1364 jbd2_mark_journal_empty+06c/0xbd > ... > [addresses omitted for sanity: traceback only] > warn_slowpath_common+0x83/0x9b > warn_slowpath_null+0x1a/0x1c > jbd2_mark_journal_empty+06c/0xbd > jbd2_journal_destroy+0x183/0x20c > ? abort_exclusive_wait+0x8e/0x8e > ext4_put_super+0x6c/0x316 > ? evict_inodes+0xe6/0xf1 > generic_shutdown_super+0x59/0xd1 > ? free_vfsmnt+0x18/0x3c > kill_block_super+0x27/0x6a > deactivate_locked_super+0x26/0x57 > deactivate_super+0x3f/0x43 > mntput_no_expire+0x134/0x13c > sys_umount+0x308/0x33a > system_call_fastpath+0x16/0x1b -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
