On ma, 2008-01-28 at 12:46 +1100, Nick Piggin wrote: > On Sunday 27 January 2008 00:29, Frederik Himpe wrote: > > On di, 2008-01-22 at 16:25 +1100, Nick Piggin wrote: > > > > > On Tuesday 22 January 2008 07:58, Frederik Himpe wrote: > > > > > > With Linux 2.6.24-rc8 I often have the problem that the pan usenet > > > > > > reader starts using 100% of CPU time after some time. When this > > > > > > happens, kill -9 does not work, and strace just hangs when trying > > > > > > to attach to the process. The same with gdb. ps shows the process > > > > > > as being in the R state. > > > > > > > > > > > > I pressed Ctrl-Alt-SysRq-T, and this was shown for pan: > > > > > > Jan 21 21:45:01 Anastacia kernel: pan R running task > > > > > > 0 > > > > > > Nasty. The attached patch is something really simple that can sometimes > > > help. sysrq+p is also an option, if you're on a UP system. > > > > > > Any luck getting traces? > > > > I just succeeded to reproduce the problem with this patch. Does this > > smell like an XFS problem? > > > > Jan 26 14:17:43 Anastacia kernel: pan R running task 0 > > 7564 1 Jan 26 14:17:43 Anastacia kernel: 000000003f5b3248 > > 0000000000001000 ffffffff880c28b0 0000000000000000 Jan 26 14:17:43 > > Anastacia kernel: ffff81003f5b3248 ffff81002d1ed900 000000002d1ed900 > > 0000000000000000 Jan 26 14:17:43 Anastacia kernel: ffff810016050dd0 > > fffff000fffff000 0000000000000000 ffff81002d1eda10 Jan 26 14:17:43 > > Anastacia kernel: Call Trace: > > Jan 26 14:17:43 Anastacia kernel: [_end+127964408/2129947720] > > :xfs:xfs_get_blocks+0x0/0x10 Jan 26 14:17:43 Anastacia kernel: > > [unix_poll+0/176] unix_poll+0x0/0xb0 Jan 26 14:17:43 Anastacia kernel: > > [_end+127964408/2129947720] :xfs:xfs_get_blocks+0x0/0x10 Jan 26 14:17:43 > > Anastacia kernel: [iov_iter_copy_from_user_atomic+65/160] > > iov_iter_copy_from_user_atomic+0x41/0xa0 Jan 26 14:17:43 Anastacia kernel: > > [iov_iter_copy_from_user_atomic+46/160] > > iov_iter_copy_from_user_atomic+0x2e/0xa0 Jan 26 14:17:43 Anastacia kernel: > > [generic_file_buffered_write+383/1728] > > Well after trying a lot of writev combinations, I've reproduced a hang > *hangs head*. > > Does this help?
I'm currently running with this patch. The problem happens about two times a week, so it will take a few days to come to a conclusion whether it is fixed. I'll let you all know. Thanks for the patch! -- Frederik Himpe <[EMAIL PROTECTED]> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
