On Mon, 2010-10-18 at 23:43 +0200, Andreas Feldner wrote: > Package: linux-2.6 > Version: 2.6.32-23 > Severity: important > > My system crashes reproducibly during the gparted operation "move /dev/sda1 to the right" in the read-only test stage. > It is very hard to track down as the system freezes (ping is working, no other networking stuff like sshd, screen > is black, keyboard doesn't react, not even the shift indicator LEDs). After reboot, no indication of the problem > can be found in the log files anymore. > > Running tail -f /var/log/kern.log on a different machine, and running gparted with remote X11 did the trick to > get to some information. The following lines were the last words to hear from the machine: > > Oct 18 21:44:10 xxxxxxx kernel: [88819.864398] BUG: unable to handle kernel NULL pointer dereference at (null) > Oct 18 21:44:10 xxxxxxx kernel: [88819.864413] IP: [<ffffffff8110c456>] drop_buffers+0x23/0x9d > Oct 18 21:44:10 xxxxxxx kernel: [88819.864429] PGD 7d9c4067 PUD 1f542067 PMD 0 > Oct 18 21:44:10 xxxxxxx kernel: [88819.864439] Oops: 0000 [#1] SMP > > gparted was attempting to read a 511.94 GiB sized partition on a SATA disk with a block size of 16.00 MiB. The > crash orccured at 365.60 GiB (in case that matters). The file system on the partition in question is reported > OK by fsck. A test with dd if=/dev/sda1 of=/dev/null bs=4096 worked out OK (didn't try with 16M block size). > SMART status if the hard disk is passed. > > I suspect some rare freezes of the machine to come from the same origin, though I didn't find another way > to actually reproduce the problem than running the described gparted operation. > > Unfortunately, I have no idea if this bug report contains any useful information, nor how to provide any > additional. [...] It really isn't enough information. Please use netconsole or a serial console to capture the full 'oops' message. Also please test whether this is reproducible if you don't use the nvidia proprietary driver. Ben. -- Ben Hutchings Once a job is fouled up, anything done to improve it makes it worse.
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