Hey folks, We have two servers that map a lot of RBDs (20 to 30 each so far), using the RBD kernel module. They are running Ubuntu 12.10, and I originally saw a lot of kernel panics (obviously from Ceph) when running a 3.5.7 kernel. I upgrade a while back to a 3.8.5 kernel to get a much newer RBD module, and the kernel panics from Ceph went away...and were replaced by these nebulous "General Protection Faults" that I couldn't really tell what was causing them. Today we saw one that actually had a Ceph backtrace in it, so I wanted to throw it on here: May 6 23:02:58 nfs1 kernel: [295972.423165] general protection fault: 0000 [#3] SMP May 6 23:02:58 nfs1 kernel: [295972.428252] Modules linked in: rbd libceph libcrc32c coretemp nfsd kvm nfs_acl auth_rpcgss nfs fscache lockd sunrpc gpio_ich psmouse microcode serio_raw i7core_edac ipmi_si edac_core lpc_ich ioatdma ipmi_devintf mac_hid ipmi_msghandler bonding lp parport tcp_bic raid10 raid456 async_pq async_xor xor async_memcpy async_raid6_recov hid_generic raid6_pq usbhid async_tx hid igb raid1 myri10ge raid0 ahci ptp libahci dca pps_core multipath linear May 6 23:02:58 nfs1 kernel: [295972.468114] CPU 17 May 6 23:02:58 nfs1 kernel: [295972.470133] Pid: 15920, comm: kworker/17:2 Tainted: G D 3.8.5-030805-generic #201303281651 Penguin Computing Relion 1751/X8DTU May 6 23:02:58 nfs1 kernel: [295972.482635] RIP: 0010:[<ffffffff811851ff>] [<ffffffff811851ff>] kmem_cache_alloc_trace+0x5f/0x140 May 6 23:02:58 nfs1 kernel: [295972.491686] RSP: 0018:ffff880624cb1a98 EFLAGS: 00010202 May 6 23:02:58 nfs1 kernel: [295972.497074] RAX: 0000000000000000 RBX: ffff88032ddc46d0 RCX: 000000000003c867 May 6 23:02:58 nfs1 kernel: [295972.504283] RDX: 000000000003c866 RSI: 0000000000008050 RDI: 0000000000016c80 May 6 23:02:58 nfs1 kernel: [295972.511490] RBP: ffff880624cb1ae8 R08: ffff880333d76c80 R09: 0000000000000002 May 6 23:02:58 nfs1 kernel: [295972.518697] R10: ffff88032ce40070 R11: 000000000000000d R12: ffff880333802200 May 6 23:02:58 nfs1 kernel: [295972.525906] R13: 2e0460b9275465f2 R14: ffffffffa023901e R15: 0000000000008050 May 6 23:02:58 nfs1 kernel: [295972.533113] FS: 0000000000000000(0000) GS:ffff880333d60000(0000) knlGS:0000000000000000 May 6 23:02:58 nfs1 kernel: [295972.541274] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b May 6 23:02:58 nfs1 kernel: [295972.547095] CR2: 00007fbf9467f2b0 CR3: 0000000001c0d000 CR4: 00000000000007e0 May 6 23:02:58 nfs1 kernel: [295972.554305] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 May 6 23:02:58 nfs1 kernel: [295972.561512] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 May 6 23:02:58 nfs1 kernel: [295972.568720] Process kworker/17:2 (pid: 15920, threadinfo ffff880624cb0000, task ffff88032b600000) May 6 23:02:58 nfs1 kernel: [295972.577656] Stack: May 6 23:02:58 nfs1 kernel: [295972.579756] 0000000000000000 0000000000000000 0000000000000060 0000000000000000 May 6 23:02:58 nfs1 kernel: [295972.587292] 0000000000000000 ffff88032ddc46d0 0000000000000004 ffff88032ddc46c0 May 6 23:02:58 nfs1 kernel: [295972.594819] ffff88032b432b30 0000000000000000 ffff880624cb1b28 ffffffffa023901e May 6 23:02:58 nfs1 kernel: [295972.602347] Call Trace: May 6 23:02:58 nfs1 kernel: [295972.604886] [<ffffffffa023901e>] get_ticket_handler.isra.4+0x5e/0xc0 [libceph] May 6 23:02:58 nfs1 kernel: [295972.612271] [<ffffffffa02394b4>] ceph_x_proc_ticket_reply+0x274/0x440 [libceph] May 6 23:02:58 nfs1 kernel: [295972.619740] [<ffffffffa023973d>] ceph_x_handle_reply+0xbd/0x110 [libceph] May 6 23:02:58 nfs1 kernel: [295972.626696] [<ffffffffa023765c>] ceph_handle_auth_reply+0x18c/0x200 [libceph] May 6 23:02:58 nfs1 kernel: [295972.633988] [<ffffffffa022d590>] handle_auth_reply.isra.12+0xa0/0x230 [libceph] May 6 23:02:58 nfs1 kernel: [295972.641457] [<ffffffffa022e87d>] dispatch+0xbd/0x120 [libceph] May 6 23:02:58 nfs1 kernel: [295972.647450] [<ffffffffa0228205>] process_message+0xa5/0xc0 [libceph] May 6 23:02:58 nfs1 kernel: [295972.653966] [<ffffffffa022c1b1>] try_read+0x2e1/0x430 [libceph] May 6 23:02:58 nfs1 kernel: [295972.660048] [<ffffffffa022c38f>] con_work+0x8f/0x140 [libceph] May 6 23:02:58 nfs1 kernel: [295972.666043] [<ffffffff81078c31>] process_one_work+0x141/0x490 May 6 23:02:58 nfs1 kernel: [295972.671952] [<ffffffff81079b08>] worker_thread+0x168/0x400 May 6 23:02:58 nfs1 kernel: [295972.677601] [<ffffffff810799a0>] ? manage_workers+0x120/0x120 May 6 23:02:58 nfs1 kernel: [295972.683513] [<ffffffff8107eff0>] kthread+0xc0/0xd0 May 6 23:02:58 nfs1 kernel: [295972.688469] [<ffffffff8107ef30>] ? flush_kthread_worker+0xb0/0xb0 May 6 23:02:58 nfs1 kernel: [295972.694726] [<ffffffff816f532c>] ret_from_fork+0x7c/0xb0 May 6 23:02:58 nfs1 kernel: [295972.700203] [<ffffffff8107ef30>] ? flush_kthread_worker+0xb0/0xb0 May 6 23:02:58 nfs1 kernel: [295972.706456] Code: 00 4d 8b 04 24 65 4c 03 04 25 08 dc 00 00 49 8b 50 08 4d 8b 28 4d 85 ed 0f 84 cf 00 00 00 49 63 44 24 20 49 8b 3c 24 48 8d 4a 01 <49> 8b 5c 05 00 4c 89 e8 65 48 0f c7 0f 0f 94 c0 84 c0 74 c2 49 May 6 23:02:58 nfs1 kernel: [295972.726468] RIP [<ffffffff811851ff>] kmem_cache_alloc_trace+0x5f/0x140 May 6 23:02:58 nfs1 kernel: [295972.733182] RSP <ffff880624cb1a98> May 6 23:02:58 nfs1 kernel: [295972.736838] ---[ end trace 20e9b6a1bb611aba ]--- I'm not sure whether the problem started here or not. I mentioned that the previous GPFs were nebulous -- one thing most of them have had in common is that it's almost always from nfsd (this one isn't -- first and only time I've seen this one). Howevever, I am using NFS to re-export some RBDs (to provide access to multiple clients) so Ceph is still in the picture on those. I know its not a lot to go on, but any advice would be appreciated. - Travis -- 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
