On 06/23/2014 06:13 PM, Mark Tinguely wrote: > On 06/23/14 17:08, Mark Tinguely wrote: >> On 06/23/14 16:48, Michael L. Semon wrote: >>> At the ACL limit of v5-superblock XFS--with a directory filled with >>> both default >>> and access ACL entries--I'm getting a null pointer dereference on x86 >>> after >>> creating the directory successfully. >>> >>> Disclaimer: There's some current issues on 32-bit x86 that, for >>> instance, can >>> make badblocks see phantom bad blocks on a read test. My apologies in >>> advance >>> if this turns out to be a false alarm bug report. >>> >>> My first encounter with this issue involved fsstress. Here's part of a >>> `crash` >>> session from the fsstress run. >>> >>> root@oldsvrhw:/mnt/crashdump/xfs-fsstress-max-acl-2# crash vmlinux >>> System.map vmcore >>> crash 7.0.4 > ... >>> Thanks! >>> >>> Michael >>> >> >> Michael, do you have the vmcore dump for this or was this just from the >> messages. >> >> Thanks. >> >> --Mark. > > ummm, duh me. you were running crash ... > > Can I look at the core? > > --Mark. Sure! I've uploaded two sets of core dumps (vmcore, vmlinux, System.map, config, sample crash session) and put them here for a short time: https://drive.google.com/folderview?id=0B41268QKoNjtUGFpcTlCbEdkQXM xfs-fsstress-max-acl-2.tar.xz has the dmesg that was originally posted. xfs-fsstress-max-acl-3.tar.xz came from the simple mkdir/rm test. I got lucky with this simple test because the message looks like it came from the kernel linked list diagnostic: [ 1068.431391] ------------[ cut here ]------------ [ 1068.431566] WARNING: CPU: 0 PID: 41 at lib/list_debug.c:59 __list_del_entry+0xce/0x110() [ 1068.431596] list_del corruption. prev->next should be db5bf580, but was (null) [ 1068.431629] CPU: 0 PID: 41 Comm: kworker/0:1H Not tainted 3.16.0-rc1+ #3 [ 1068.431656] Hardware name: Dell Computer Corporation L733r /CA810E , BIOS A14 09/05/2001 [ 1068.431697] Workqueue: xfslogd xfs_buf_iodone_work [ 1068.431738] 00000000 00000000 de92fc24 c15d4e76 de92fc68 de92fc58 c103ca33 c1737648 [ 1068.431891] de92fc84 00000029 c173705a 0000003b c13c3e9e 0000003b c13c3e9e 0000003b [ 1068.432115] db5bf580 00000001 de92fc70 c103cab3 00000009 de92fc68 c1737648 de92fc84 [ 1068.432267] Call Trace: [ 1068.432329] [<c15d4e76>] dump_stack+0x48/0x60 [ 1068.432386] [<c103ca33>] warn_slowpath_common+0x83/0xa0 [ 1068.432433] [<c13c3e9e>] ? __list_del_entry+0xce/0x110 [ 1068.432478] [<c13c3e9e>] ? __list_del_entry+0xce/0x110 [ 1068.432524] [<c103cab3>] warn_slowpath_fmt+0x33/0x40 [ 1068.432569] [<c13c3e9e>] __list_del_entry+0xce/0x110 [ 1068.432615] [<c13c3eeb>] list_del+0xb/0x20 [ 1068.432674] [<c126eb4d>] xfs_ail_delete+0x1d/0x60 [ 1068.432721] [<c126f945>] xfs_trans_ail_update_bulk+0x1a5/0x410 [ 1068.432780] [<c12070ab>] xfs_trans_committed_bulk+0x2eb/0x320 [ 1068.432827] [<c126957a>] xlog_cil_committed+0x3a/0x150 [ 1068.432874] [<c12655ba>] xlog_state_do_callback+0x18a/0x390 [ 1068.432919] [<c1265883>] xlog_state_done_syncing+0xc3/0xe0 [ 1068.432964] [<c126590e>] xlog_iodone+0x6e/0x100 [ 1068.433055] [<c11e821b>] xfs_buf_iodone_work+0x5b/0xe0 [ 1068.433114] [<c1058557>] process_one_work+0x1b7/0x5d0 [ 1068.433160] [<c10584da>] ? process_one_work+0x13a/0x5d0 [ 1068.433205] [<c1058a1b>] ? worker_thread+0xab/0x4b0 [ 1068.433250] [<c10589a9>] worker_thread+0x39/0x4b0 [ 1068.433304] [<c108909b>] ? trace_hardirqs_on+0xb/0x10 [ 1068.433350] [<c1058970>] ? process_one_work+0x5d0/0x5d0 [ 1068.433398] [<c105fb58>] kthread+0xa8/0xc0 [ 1068.433444] [<c108909b>] ? trace_hardirqs_on+0xb/0x10 [ 1068.433495] [<c15dc781>] ret_from_kernel_thread+0x21/0x30 [ 1068.433540] [<c105fab0>] ? insert_kthread_work+0x80/0x80 [ 1068.433567] ---[ end trace 60289514948e4bd7 ]--- [ 1068.433603] BUG: unable to handle kernel NULL pointer dereference at 0000000c [ 1068.433795] IP: [<c126eac8>] xfs_ail_check+0x58/0xc0 [ 1068.433925] *pde = 00000000 [ 1068.434027] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC [ 1068.434027] CPU: 0 PID: 41 Comm: kworker/0:1H Tainted: G W 3.16.0-rc1+ #3 [ 1068.434027] Hardware name: Dell Computer Corporation L733r /CA810E , BIOS A14 09/05/2001 [ 1068.434027] Workqueue: xfslogd xfs_buf_iodone_work [ 1068.434027] task: de8faac0 ti: de92e000 task.ti: de92e000 [ 1068.434027] EIP: 0060:[<c126eac8>] EFLAGS: 00010286 CPU: 0 [ 1068.434027] EIP is at xfs_ail_check+0x58/0xc0 [ 1068.434027] EAX: 00000000 EBX: db5bf0b0 ECX: 00000015 EDX: 00000015 [ 1068.434027] ESI: 00000001 EDI: 00000001 EBP: de92fc9c ESP: de92fc90 [ 1068.434027] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 [ 1068.434027] CR0: 8005003b CR2: 0000000c CR3: 00ab9000 CR4: 000007d0 [ 1068.434027] Stack: [ 1068.434027] ddc81d80 db5bf0b0 00000001 de92fcac c126eb43 db5bf0b0 00000005 de92fd04 [ 1068.434027] c126f945 00000000 00000001 00000000 00000000 ddc81d88 de92fd38 db04b210 [ 1068.434027] ddc81d80 00000000 00000015 de92fd44 ddc81d80 00000001 00000037 00000005 [ 1068.434027] Call Trace: [ 1068.434027] [<c126eb43>] xfs_ail_delete+0x13/0x60 [ 1068.434027] [<c126f945>] xfs_trans_ail_update_bulk+0x1a5/0x410 [ 1068.434027] [<c12070ab>] xfs_trans_committed_bulk+0x2eb/0x320 [ 1068.434027] [<c126957a>] xlog_cil_committed+0x3a/0x150 [ 1068.434027] [<c12655ba>] xlog_state_do_callback+0x18a/0x390 [ 1068.434027] [<c1265883>] xlog_state_done_syncing+0xc3/0xe0 [ 1068.434027] [<c126590e>] xlog_iodone+0x6e/0x100 [ 1068.434027] [<c11e821b>] xfs_buf_iodone_work+0x5b/0xe0 [ 1068.434027] [<c1058557>] process_one_work+0x1b7/0x5d0 [ 1068.434027] [<c10584da>] ? process_one_work+0x13a/0x5d0 [ 1068.434027] [<c1058a1b>] ? worker_thread+0xab/0x4b0 [ 1068.434027] [<c10589a9>] worker_thread+0x39/0x4b0 [ 1068.434027] [<c108909b>] ? trace_hardirqs_on+0xb/0x10 [ 1068.434027] [<c1058970>] ? process_one_work+0x5d0/0x5d0 [ 1068.434027] [<c105fb58>] kthread+0xa8/0xc0 [ 1068.434027] [<c108909b>] ? trace_hardirqs_on+0xb/0x10 [ 1068.434027] [<c15dc781>] ret_from_kernel_thread+0x21/0x30 [ 1068.434027] [<c105fab0>] ? insert_kthread_work+0x80/0x80 [ 1068.434027] Code: c1 b8 50 be 72 c1 e8 38 f7 f8 ff 8b 43 04 39 c6 74 10 8b 7b 0c 39 78 0c 8b 53 08 8b 48 08 74 43 73 45 8b 03 39 c6 74 24 8b 73 0c <39> 70 0c 8b 53 08 8b 48 08 74 4d 73 14 b9 38 00 00 00 ba 83 a3 [ 1068.434027] EIP: [<c126eac8>] xfs_ail_check+0x58/0xc0 SS:ESP 0068:de92fc90 [ 1068.434027] CR2: 000000000000000c I can reproduce the oops in kernel 3.15.0, perhaps with xfs-oss/for-next merged, but there's no vmlinux to go with the kernel. Therefore, I'll have to resort to other means (rebuilt kernel with netconsole, re-attaching the serial cable, etc.) to get the full crash log. Thanks for looking into this! I'll take Dave's advice on tracing, too, but it will be morning before I can collect the results. Michael _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
