On Wed, Jun 07, 2017 at 11:33:57AM +0800, Eryu Guan wrote: > On Fri, Jun 02, 2017 at 02:04:57PM +0800, Eryu Guan wrote: > > Hi all, > > > > Starting from 4.12-rc1 kernel, I saw Linux nfs server crashes all the > > time in my fstests (xfstests) runs, I appended the console log of an > > NFSv3 crash to the end of this mail. > > > > I was exporting a directory resided on XFS, and loopback mounted the NFS > > export on localhost. Both NFSv3 and NFSv4 could hit this crash. The > > I did more test runs with ext4 exported, seems it's only reproducible > when the exported local filesystem is XFS, ext4 survived 20 rounds of > fstests runs auto group tests. > > And this crash can still be seen with 4.12-rc4 kernel. So this sounds a little more likely to be an xfs bug. I also don't see any likely looking nfsd commits in the v4.11..v4.12-rc1 range. But I take it you can't reproduce when running directly on xfs with no NFS involvement? Not knowing this code well I don't know what to suggest other than the long painful bisect. --b. > Thanks, > Eryu > > > crash usually happens when running test case generic/029 or generic/095. > > > > But the problem is, there's no easy and efficient way to reproduce it, I > > tried run only generic/029 and generic/095 in a loop for 1000 times but > > failed, I also tried run the 'quick' group tests only for 50 iterations > > but failed again. It seems that the only reliable way to reproduce it is > > run the 'auto' group tests for 20 iterations. > > > > i=0 > > while [ $i -lt 20 ]; do > > ./check -nfs -g auto > > ((i++)) > > done > > > > And usually server crashed within 5 iterations, but at times it could > > survive 10 iterations and only crashed if you left it running for more > > iterations. This makes it hard to bisect and bisecting is very > > time-consuming. > > > > (The bisecting is running now, it needs a few days to finish. My first > > two attempts pointed first bad commit to some mm patches, but reverting > > that patch didn't prevent server from crashing, so I enlarged the loop > > count and started bisecting for the third time). > > > > If more info is needed please let me know. > > > > Thanks, > > Eryu > > > > > > [88895.796834] run fstests generic/028 at 2017-06-01 00:43:18 > > [88900.945420] run fstests generic/029 at 2017-06-01 00:43:23 > > [88901.127315] BUG: unable to handle kernel paging request at ffffffffc0360e12 > > [88901.135095] IP: report_bug+0x64/0x100 > > [88901.139177] PGD 3b7c0c067 > > [88901.139177] P4D 3b7c0c067 > > [88901.142194] PUD 3b7c0e067 > > [88901.145209] PMD 469e33067 > > [88901.148225] PTE 80000004675f4161 > > [88901.151240] > > [88901.156497] Oops: 0003 [#1] SMP > > [88901.159997] Modules linked in: loop dm_mod nfsv3 nfs fscache ext4 jbd2 mbcache intel_rapl sb_edac x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm nfsd irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc ipmi_ssif cdc_ether aesni_intel iTCO_wdt usbnet crypto_simd ipmi_si glue_helper sg iTCO_vendor_support wmi mii cryptd ipmi_devintf ipmi_msghandler auth_rpcgss shpchp i2c_i801 pcspkr ioatdma lpc_ich nfs_acl lockd grace sunrpc ip_tables xfs libcrc32c sd_mod mgag200 drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops igb ttm drm ptp pps_core dca megaraid_sas crc32c_intel i2c_algo_bit i2c_core > > [88901.221606] CPU: 9 PID: 3278 Comm: nfsd Not tainted 4.12.0-rc3 #42 > > [88901.228500] Hardware name: IBM System x3650 M4 -[7915ON3]-/00J6520, BIOS -[VVE124AUS-1.30]- 11/21/2012 > > [88901.238885] task: ffffa10062d12d00 task.stack: ffffc2820478c000 > > [88901.245488] RIP: 0010:report_bug+0x64/0x100 > > [88901.250153] RSP: 0018:ffffc2820478f598 EFLAGS: 00010202 > > [88901.255980] RAX: ffffffffc0360e08 RBX: ffffffffc0301cdc RCX: 0000000000000001 > > [88901.263940] RDX: 0000000000000907 RSI: ffffffffc038bc80 RDI: ffffffffffff0d22 > > [88901.271901] RBP: ffffc2820478f5b8 R08: 0000000000000001 R09: 00000000000001cc > > [88901.279861] R10: ffffffffb6a36f67 R11: 0000000000000000 R12: ffffc2820478f6e8 > > [88901.287821] R13: ffffffffc0351b2a R14: 00000000000003fb R15: 0000000000000004 > > [88901.295783] FS: 0000000000000000(0000) GS:ffffa1007f6c0000(0000) knlGS:0000000000000000 > > [88901.304818] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > [88901.311227] CR2: ffffffffc0360e12 CR3: 00000003b7c09000 CR4: 00000000000406e0 > > [88901.319188] Call Trace: > > [88901.321920] do_trap+0x16a/0x190 > > [88901.325519] do_error_trap+0x89/0x110 > > [88901.329652] ? xfs_do_writepage+0x65c/0x680 [xfs] > > [88901.334917] ? _xfs_buf_find+0x2a2/0x510 [xfs] > > [88901.339875] ? kmem_cache_alloc+0x194/0x1a0 > > [88901.344561] ? kmem_zone_alloc+0x96/0x100 [xfs] > > [88901.349615] do_invalid_op+0x20/0x30 > > [88901.353604] invalid_op+0x1e/0x30 > > [88901.357318] RIP: 0010:xfs_do_writepage+0x65c/0x680 [xfs] > > [88901.363242] RSP: 0018:ffffc2820478f790 EFLAGS: 00010206 > > [88901.369069] RAX: 0000000000340140 RBX: ffffc2820478f8b8 RCX: 0000000000000000 > > [88901.377030] RDX: 0000000000000000 RSI: ffffc2820478f9f8 RDI: fffffc2be1095400 > > [88901.384991] RBP: ffffc2820478f838 R08: 0000000000000002 R09: 000000000001ff20 > > [88901.392950] R10: ffffa1007ffd1d00 R11: 0000000000000000 R12: ffffa10053c2ea58 > > [88901.400911] R13: fffffc2be1095400 R14: ffffc2820478f960 R15: ffffc2820478f9f8 > > [88901.408876] ? page_mkclean+0x69/0xb0 > > [88901.412960] ? invalid_page_referenced_vma+0x90/0x90 > > [88901.418500] write_cache_pages+0x26f/0x510 > > [88901.423085] ? xfs_vm_set_page_dirty+0x1d0/0x1d0 [xfs] > > [88901.428819] ? block_write_end+0x36/0x80 > > [88901.433193] ? generic_write_end+0x54/0xc0 > > [88901.437791] xfs_vm_writepages+0xb6/0xd0 [xfs] > > [88901.442741] do_writepages+0x1c/0x70 > > [88901.446727] __filemap_fdatawrite_range+0xc6/0x100 > > [88901.452071] filemap_write_and_wait_range+0x41/0x90 > > [88901.457532] xfs_file_fsync+0x63/0x1d0 [xfs] > > [88901.462294] vfs_fsync_range+0x3d/0xb0 > > [88901.466491] xfs_file_write_iter+0x121/0x140 [xfs] > > [88901.471835] __do_readv_writev+0x2d3/0x360 > > [88901.476402] do_readv_writev+0x76/0xb0 > > [88901.480582] ? do_dentry_open+0x261/0x310 > > [88901.485069] ? xfs_extent_busy_ag_cmp+0x20/0x20 [xfs] > > [88901.490704] vfs_writev+0x3c/0x50 > > [88901.494409] nfsd_vfs_write+0xd0/0x360 [nfsd] > > [88901.499271] ? ima_file_check+0x20/0x30 > > [88901.503553] nfsd_write+0x15a/0x210 [nfsd] > > [88901.508116] nfsd3_proc_write+0x9d/0x130 [nfsd] > > [88901.513172] nfsd_dispatch+0xce/0x270 [nfsd] > > [88901.517950] svc_process_common+0x387/0x740 [sunrpc] > > [88901.523492] svc_process+0xfc/0x1c0 [sunrpc] > > [88901.528248] nfsd+0xe9/0x160 [nfsd] > > [88901.532137] kthread+0x109/0x140 > > [88901.535740] ? nfsd_destroy+0x60/0x60 [nfsd] > > [88901.540501] ? kthread_park+0x60/0x60 > > [88901.544586] ret_from_fork+0x25/0x30 > > [88901.548572] Code: 63 78 04 44 0f b7 70 08 41 89 d0 4c 8d 2c 38 41 83 e0 01 f6 c2 02 74 17 66 45 85 c0 74 11 f6 c2 04 b9 01 00 00 00 75 bb 83 ca 04 <66> 89 50 0a 66 45 85 c0 74 52 0f b6 48 0b 41 0f b7 f6 4d 89 e0 > > [88901.569642] RIP: report_bug+0x64/0x100 RSP: ffffc2820478f598 > > [88901.575955] CR2: ffffffffc0360e12 > > [88901.579663] ---[ end trace 62c63b9fb594e7f4 ]--- > > [88901.584811] Kernel panic - not syncing: Fatal exception > > [88901.590694] Kernel Offset: 0x35000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) > > [88901.602731] Rebooting in 3 seconds.. > -- > To unsubscribe from this list: send the line "unsubscribe linux-nfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
