https://jira.whamcloud.com This file is an XML representation of an issue en-us 9.4.14 940014 05-12-2023 https://jira.whamcloud.com/browse/LU-12945 Lustre <p><tt>Oct 26 12:58:25 oss kernel: BUG: Bad page state in process socknal_sd03_00 pfn:b0641</tt><br/> <tt>Oct 26 12:58:25 oss kernel: page:ffffeea482c19040 count:0 mapcount:-1 mapping: (null) index:0x0</tt><br/> <tt>Oct 26 12:58:25 oss kernel: page flags: 0x1fffff00008000(tail)</tt><br/> <tt>Oct 26 12:58:25 oss kernel: page dumped because: nonzero mapcount</tt><br/> <tt>Oct 26 12:58:25 oss kernel: Modules linked in: osp(OE) ofd(OE) lfsck(OE) ost(OE) mgc(OE) osd_zfs(OE) lquota(OE) fid(OE) fld(OE) ksocklnd(OE) ptlrpc(OE) obdclass(OE) lnet(OE) libcfs(OE) fuse zfs(POE) snd_hda_codec_generic zunicode(POE) zlua(POE) ppdev zcommon(POE) znvpair(POE) zavl(POE) snd_hda_intel icp(POE) iosf_mbi crc32_pclmul snd_hda_codec spl(OE) snd_hda_core snd_hwdep ghash_clmulni_intel snd_seq snd_seq_device aesni_intel snd_pcm lrw gf128mul joydev glue_helper snd_timer parport_pc ablk_helper snd virtio_balloon cryptd pcspkr parport sg soundcore i2c_piix4 ip_tables xfs libcrc32c sd_mod sr_mod crc_t10dif cdrom crct10dif_generic ata_generic pata_acpi virtio_scsi virtio_net virtio_console qxl drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm ata_piix drm crct10dif_pclmul libata virtio_pci crct10dif_common</tt><br/> <tt>Oct 26 12:58:25 oss kernel: virtio_ring crc32c_intel serio_raw floppy virtio drm_panel_orientation_quirks dm_mirror dm_region_hash dm_log dm_mod</tt><br/> <tt>Oct 26 12:58:25 oss kernel: CPU: 6 PID: 4165 Comm: socknal_sd03_00 Kdump: loaded Tainted: P OE ------------ 3.10.0-957.27.3.ldiskfs.el7.x86_64 #1</tt></p> <p>When running with upstream linux <b>debug</b> <span class="error">&#91;CONFIG_DEBUG_VM&#93;</span> kernel (v5.0-3279-ga10674bf2406) has added a test for PageSlab() on the memory passed to tcp_sendpages and blocks sending.</p> <p>Oct 30 23:47:01 oss kernel: WARNING: CPU: 2 PID: 3642 at net/ipv4/tcp.c:966 do_tcp_sendpages+0xb56/0xcb0</p> <p>Avoid sending PageSlab through the tcp stack</p> LU-12945

Avoid sending PageSlab pages through tcp stack

Bug Minor Resolved Fixed Shaun Tancheff Shaun Tancheff Wed, 6 Nov 2019 18:53:15 +0000 Wed, 17 Feb 2021 22:13:16 +0000 Wed, 10 Jun 2020 15:50:55 +0000 Lustre 2.14.0 0 3 <p>Shaun Tancheff (stancheff@cray.com) uploaded a new patch: <a href="https://review.whamcloud.com/36691" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/36691</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-12945" title="Avoid sending PageSlab pages through tcp stack" class="issue-link" data-issue-key="LU-12945"><del>LU-12945</del></a> lnet: Avoid sending PageSlab pages via tcp<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: 9f59d66ab83ce50de606b063da9a8bc6693ed55a</p> <p>Frequency of PageSlab occurrence:<br/>      ksocknal_lib_send_iov: buffered 142330 / zero 197893</p> <p>The vast majority of buffered sends use 2 pages per instance.</p> <p>This BUG: <br/>    page:ffffeea482c19040 count:0 mapcount:-1 mapping: (null) index:0x0</p> <p>Appears to also be related to the kernel version and ZFS version used.<br/>   5.4 + zfs 0.8.2+ the issue is not reproducible.<br/> with CentOS 7.6 kernel <b>or</b> older ZFS (early 0.8.0) this does reproduce.</p> <p><a href="https://review.whamcloud.com/36691" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/36691</a> at patch 4/5/6 resolves:</p> <p><tt>Oct 26 12:58:25 oss kernel: BUG: Bad page state in process socknal_sd03_00 pfn:b0641</tt><br/> <tt>Oct 26 12:58:25 oss kernel: page:ffffeea482c19040 count:0 mapcount:-1 mapping: (null) index:0x0</tt><br/> <tt>O</tt></p> <p>For all zfs/kernel combinations.</p> <p> </p> <p><del>Shaun Tancheff (stancheff@cray.com) uploaded a new patch:</del> <a href="https://review.whamcloud.com/37297" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/37297</a><br/> <del>Subject: <a href="https://jira.whamcloud.com/browse/LU-12945" title="Avoid sending PageSlab pages through tcp stack" class="issue-link" data-issue-key="LU-12945"><del>LU-12945</del></a> lnet: Disable zero copy when running on VM</del><br/> <del>Project: fs/lustre-release</del><br/> <del>Branch: master</del><br/> <del>Current Patch Set: 1</del><br/> <del>Commit: 6dd727501adf35064d4d6dcd9b1c5f60688883bc</del></p> <p>Shaun Tancheff (stancheff@cray.com) uploaded a new patch: <a href="https://review.whamcloud.com/37300" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/37300</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-12945" title="Avoid sending PageSlab pages through tcp stack" class="issue-link" data-issue-key="LU-12945"><del>LU-12945</del></a> lnet: Disable zero copy when running on VM<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: 9d485b153fd18cfc739012a864944eaf0c29fd42</p> <p>Oleg Drokin (green@whamcloud.com) merged in patch <a href="https://review.whamcloud.com/37300/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/37300/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-12945" title="Avoid sending PageSlab pages through tcp stack" class="issue-link" data-issue-key="LU-12945"><del>LU-12945</del></a> lnet: Disable zero copy when running on VM<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: <br/> Commit: 0c45e49457a3f61ca661f4f7b0ad749cceaf7709</p> <p>All patches needed for issue are landed.</p> Development Rank 1|i00p33: Rank (Obsolete) 9223372036854775807 Severity