On Mon, Jun 4, 2012 at 4:43 PM, udit agarwal <fzdudit@xxxxxxxxx> wrote: > Sorry ,the link is: [...] If you run iozone again, does the bug happen again? Comparing your iozone run with our test suite, we don't currently do -i 2 (random read/write), and we only run a few specific record sizes to save time (-r 16K,1M); your run is talking about record len "4" (K?) when it crashes. That might be relevant for triggering this. Summarizing for others: Jun 4 22:19:03 hp1 kernel: [ 7627.132026] BUG: unable to handle kernel NULL pointer dereference at 000000000000000a Jun 4 22:19:03 hp1 kernel: [ 7627.132036] IP: [<ffffffffa01a1fd3>] ceph_update_writeable_page+0xe3/0x590 [ceph] Jun 4 22:19:03 hp1 kernel: [ 7627.132058] PGD 795e3067 PUD 37673067 PMD 0 Jun 4 22:19:03 hp1 kernel: [ 7627.132065] Oops: 0000 [#1] PREEMPT SMP ... Jun 4 22:19:03 hp1 kernel: [ 7627.132213] Call Trace: Jun 4 22:19:03 hp1 kernel: [ 7627.132247] [<ffffffffa01a24ec>] ceph_write_begin+0x6c/0x100 [ceph] Jun 4 22:19:03 hp1 kernel: [ 7627.132267] [<ffffffff810f6652>] generic_perform_write+0xc2/0x200 Jun 4 22:19:03 hp1 kernel: [ 7627.132277] [<ffffffff810f67ea>] generic_file_buffered_write+0x5a/0x90 Jun 4 22:19:03 hp1 kernel: [ 7627.132284] [<ffffffff810f7dc9>] __generic_file_aio_write+0x219/0x410 Jun 4 22:19:03 hp1 kernel: [ 7627.132293] [<ffffffff810f802f>] generic_file_aio_write+0x6f/0xf0 Jun 4 22:19:03 hp1 kernel: [ 7627.132306] [<ffffffffa019cfbf>] ceph_aio_write+0x2cf/0x580 [ceph] Jun 4 22:19:03 hp1 kernel: [ 7627.132323] [<ffffffff811533d8>] do_sync_write+0xb8/0xf0 Jun 4 22:19:03 hp1 kernel: [ 7627.132330] [<ffffffff81153bce>] vfs_write+0xae/0x180 Jun 4 22:19:03 hp1 kernel: [ 7627.132337] [<ffffffff81153ef7>] sys_write+0x47/0x90 Jun 4 22:19:03 hp1 kernel: [ 7627.132344] [<ffffffff815a5d12>] system_call_fastpath+0x16/0x1b Any takers? Now, while we're interested in resolving this bug, we are currently focusing on RADOS, RBD, and radosgw, and that means that the Ceph Distributed File System is not getting as much of our time. It may take a while for us to come back. If none of the developers see an easy fix for this, we'll need to file it in the bug tracker and come back to it in a few months. -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
