[LU-9106] ASSERTION( vio->vui_tot_nrsegs >= vio->vui_iter->nr_segs )

• Status: Resolved
• Project: Lustre
• Type: Bug
• Priority: Minor
• Reporter: Andriy Skulysh
• Assignee: WC Triage
• Resolution: Cannot Reproduce
• Severity: 3

Description

[ 4206.142919] LustreError: 663:0:(vvp_io.c:573:vvp_io_update_iov()) ASSERTION( vio->vui_tot_nrsegs >= vio->vui_iter->nr_segs ) failed: tot_nrsegs: 1, nrsegs: 2
[ 4206.149328] LustreError: 663:0:(vvp_io.c:573:vvp_io_update_iov()) LBUG
[ 4206.152489] Pid: 663, comm: nfsd
[ 4206.154854]
               Call Trace:
[ 4206.154877]  [<ffffffffa03f1853>] libcfs_debug_dumpstack+0x53/0x80 [libcfs]
[ 4206.154883]  [<ffffffffa03f1f95>] lbug_with_loc+0x45/0xc0 [libcfs]
[ 4206.154915]  [<ffffffffa0aab327>] vvp_io_rw_lock+0x6c7/0x770 [lustre]
[ 4206.154924]  [<ffffffffa0401d27>] ? libcfs_debug_msg+0x57/0x80 [libcfs]
[ 4206.154938]  [<ffffffffa0aab403>] vvp_io_write_lock+0x33/0x40 [lustre]
[ 4206.154984]  [<ffffffffa05707fc>] cl_io_lock+0x5c/0x410 [obdclass]
[ 4206.155014]  [<ffffffffa0570db2>] cl_io_loop+0x92/0x190 [obdclass]
[ 4206.155025]  [<ffffffffa0a46c91>] ll_file_io_generic+0x601/0xad0 [lustre]
[ 4206.155035]  [<ffffffffa0a4750d>] ll_file_aio_write+0x20d/0x870 [lustre]
[ 4206.155039]  [<ffffffff811dde39>] do_sync_readv_writev+0x79/0xd0
[ 4206.155040]  [<ffffffff811df40e>] do_readv_writev+0xce/0x260
[ 4206.155049]  [<ffffffffa0a47300>] ? ll_file_aio_write+0x0/0x870 [lustre]
[ 4206.155059]  [<ffffffffa0a47b70>] ? ll_file_write+0x0/0x1d0 [lustre]
[ 4206.155061]  [<ffffffff812a7383>] ? ima_get_action+0x23/0x30
[ 4206.155063]  [<ffffffff812a69ee>] ? process_measurement+0x8e/0x250
[ 4206.155064]  [<ffffffff812a6c13>] ? ima_file_check+0x63/0x1b0
[ 4206.155065]  [<ffffffff811df635>] vfs_writev+0x35/0x60
[ 4206.155076]  [<ffffffffa029923e>] nfsd_vfs_write.isra.13+0xae/0x380 [nfsd]
[ 4206.155081]  [<ffffffffa029cf0c>] nfsd_write+0xec/0x100 [nfsd]
[ 4206.155087]  [<ffffffffa02a3660>] nfsd3_proc_write+0xc0/0x160 [nfsd]
[ 4206.155091]  [<ffffffffa029512b>] nfsd_dispatch+0xbb/0x200 [nfsd]
[ 4206.155104]  [<ffffffffa025a183>] svc_process_common+0x453/0x6f0 [sunrpc]
[ 4206.155111]  [<ffffffffa025a523>] svc_process+0x103/0x170 [sunrpc]
[ 4206.155115]  [<ffffffffa0294aaf>] nfsd+0xdf/0x150 [nfsd]
[ 4206.155118]  [<ffffffffa02949d0>] ? nfsd+0x0/0x150 [nfsd]
[ 4206.155122]  [<ffffffff810a5acf>] kthread+0xcf/0xe0
[ 4206.155123]  [<ffffffff810a5a00>] ? kthread+0x0/0xe0
[ 4206.155127]  [<ffffffff81645bd8>] ret_from_fork+0x58/0x90
[ 4206.155128]  [<ffffffff810a5a00>] ? kthread+0x0/0xe0
[ 4206.155129]
[ 4206.155130] Kernel panic - not syncing: LBUG

Issue Links

• duplicates: LU-7382 (vvp_io.c:573:vvp_io_update_iov()) AS...
• is related to: LU-4257 parallel dds are slower than serial dds

Comments

[Gerrit Updater]

Andriy Skulysh ([e-mail]) uploaded a new patch: https://review.whamcloud.com/25371
Subject: LU-9106 llite: ASSERTION(vio->vui_tot_nrsegs >= vio->vui_iter->nr_segs)
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 009f9e659e7af42b11fb5da315bab9136cc6cb1d

[Dmitry Eremin (Inactive)]

This is not related to master. What version was used to get this assert?

[Andriy Skulysh]

The assertion was hit before https://review.whamcloud.com/#/c/20256/  but u.normal.via_iter is still modified.

[Dmitry Eremin (Inactive)]

Ok. This means not affected versions more than v2.8.54.
The u.normal.via_iter is just pointer. So, modification of it not affect the content.

[Jinshan Xiong (Inactive)]

I agree with Dmitry - it's just a pointer.

[Andreas Dilger]

Should this be closed as a duplicate of LU-7382, and the patch abandoned?

[Andriy Skulysh]

LU-7382 is a different issue. This one reproduces with LU-7382 patch applied but on 2.7 branch. master doesn't need it now.

[Peter Jones]

The LU branch relates to the community releases and the master branch. It sounds like this suggestion is something that should be tracked on the SEA project (which it is)