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--></style></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Will this impact *<b>any</b>* version of Spectrum Scale? <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>-Laurence<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:12.0pt;color:black'>From: </span></b><span style='font-size:12.0pt;color:black'><gpfsug-discuss-bounces@spectrumscale.org> on behalf of Felipe Knop <knop@us.ibm.com><br><b>Reply-To: </b>gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br><b>Date: </b>Wednesday, April 15, 2020 at 11:30 AM<br><b>To: </b>"gpfsug-discuss@spectrumscale.org" <gpfsug-discuss@spectrumscale.org><br><b>Subject: </b>[EXTERNAL] [gpfsug-discuss] Kernel crashes with Spectrum Scale and RHEL 7.7 3.10.0-1062.18.1.el7 kernel<o:p></o:p></span></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>All,<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>A problem has been identified with Spectrum Scale when running on RHEL 7.7 and kernel 3.10.0-1062.18.1.el7. While a fix is being currently developed, customers should not move up to this kernel level.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>The new kernel was issued on March 17 via the following errata: <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__access.redhat.com_errata_RHSA-2D2020-3A0834&d=DwMFaQ&c=ApwzowJNAKKw3xye91w7BE1XMRKi2LN9kiMk5Csz9Zk&r=jT9YVKsK-wyY2c6HJLBajfkGf6fxXx9sJMQvbpzBd8c&m=YPN-i9g102_lT3PjOIGQW7QV30yaCMVpBjYT6IfCVD0&s=2wn47Q4RU_V-mmRfzurHdzx65hJromAUfZIxCDxU3Hc&e=">https://access.redhat.com/errata/RHSA-2020:0834</a><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>When this kernel is used with Scale, system crashes have been observed. The following are a couple of examples of kernel stack traces for the crash:<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'> <o:p></o:p></span></p></div><div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>[ 2915.625015] BUG: unable to handle kernel NULL pointer dereference at 0000000000000040<br>[ 2915.633770] IP: [<ffffffffc0e2cf90>] cxiDropSambaDCacheEntry+0x190/0x1b0 [mmfslinux]</span><span style='font-size:10.0pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>[ 2915.914097] [<ffffffffc0e3d28c>] gpfs_i_rmdir+0x29c/0x310 [mmfslinux]<br>[ 2915.921381] [<ffffffffb9663130>] ? take_dentry_name_snapshot+0xf0/0xf0<br>[ 2915.928760] [<ffffffffb9664f60>] ? shrink_dcache_parent+0x60/0x90<br>[ 2915.935656] [<ffffffffb96577cc>] vfs_rmdir+0xdc/0x150<br>[ 2915.941388] [<ffffffffb965cca1>] do_rmdir+0x1f1/0x220<br>[ 2915.947119] [<ffffffffb964ce66>] ? __fput+0x186/0x260<br>[ 2915.952849] [<ffffffffb964d02e>] ? ____fput+0xe/0x10<br>[ 2915.958484] [<ffffffffb94c2e60>] ? task_work_run+0xc0/0xe0<br>[ 2915.964701] [<ffffffffb965df05>] SyS_unlinkat+0x25/0x40</span><span style='font-size:10.0pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'><br></span><span style='font-size:10.0pt;font-family:"Courier New"'>[1224278.495993] [<ffffffff88e63918>] __dentry_kill+0x128/0x190<br>[1224278.496678] [<ffffffff88e63a36>] dput+0xb6/0x1a0<br>[1224278.497378] [<ffffffff88e64116>] d_prune_aliases+0xb6/0xf0<br>[1224278.498083] [<ffffffffc0c2c0ea>] cxiPruneDCacheEntry+0x13a/0x1c0 [mmfslinux]<br>[1224278.498798] [<ffffffffc0eba608>] _ZN10gpfsNode_t16invalidateOSNodeEPS_Pvij+0x108/0x350 [mmfs26]</span><span style='font-size:10.0pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'> <o:p></o:p></span></p></div></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>RHEL 7.8 is also impacted by the same problem, but validation of Scale with 7.8 is still under way.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'> Felipe<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>----<br>Felipe Knop knop@us.ibm.com<br>GPFS Development and Security<br>IBM Systems<br>IBM Building 008<br>2455 South Rd, Poughkeepsie, NY 12601<br>(845) 433-9314 T/L 293-9314<br> <o:p></o:p></span></p></div></div><p class=MsoNormal><br><br><o:p></o:p></p></div></body></html>