Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Wed, Feb 8, 2012 at 10:23 AM, Lars Ellenberg <lars.ellenberg at linbit.com> wrote: > On Thu, Feb 02, 2012 at 08:39:40AM -0430, Jose Ildefonso Camargo Tolosa wrote: >> Greetings, >> >> I just tried to update to DRBD 8.4.1 (after having issues with 8.3.7 : >> it would freeze reads while it was writing, see may other thread for >> more info "Read performance goes really low while writing."), and >> things looks much worse..... it just freeze to stall!, I can't >> background the cp process anymore, and I had to actually reboot the >> systems. Oh, and I got this on dmesg (before rebooting): >> >> [ 4645.904918] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 >> [ 4645.951918] IP: [<ffffffff81439544>] clone_endio+0x34/0xe0 >> [ 4646.354667] Pid: 3517, comm: kdmflush Not tainted 2.6.32-38-server #83-Ubuntu X8DTN >> [ 4647.103463] Call Trace: >> [ 4647.118114] [<ffffffff81173d2d>] bio_endio+0x1d/0x40 >> [ 4647.148336] [<ffffffffa03a87fb>] drbd_make_request+0x34b/0x350 [drbd] >> [ 4647.259232] [<ffffffff812a22a1>] generic_make_request+0x1b1/0x4f0 >> [ 4647.365981] [<ffffffff81438fcd>] __map_bio+0xad/0x130 >> [ 4647.396717] [<ffffffff814394fd>] __clone_and_map+0x4ad/0x4c0 >> [ 4647.464943] [<ffffffff8143a5d8>] __split_and_process_bio+0x108/0x190 >> [ 4647.503466] [<ffffffff8143a6b6>] dm_flush+0x56/0x70 >> (.....) >> >> I removed some lines because it was too long (I you need them, I could >> paste them somewhere). > > Very nice, thank you ;-) > That should be fixed by > http://git.drbd.org/gitweb.cgi?p=drbd-8.4.git;a=commitdiff;h=55a81dc Good! I worked around it by upgrading the kernel, but I will certainly apply that patch to any further installs (until it gets released). Thanks! Ildefonso Camargo