Attaching the .config file. And this is seen on Hardware name: IBM Power MMU=RADIX On 23/04/26 5:29 pm, Venkat Rao Bagalkote wrote: > Hello!! > > IBM CI has reported vmcore save failures when kdump is tested by > triggering a kernel crash via sysrq. > > > Below are the kernel and tool details: > > Upstream kernel version: 7.0.0+ > Upstream kernel commit-id: 2e68039281932e6dc37718a1ea7cbb8e2cda42e6 > > kexec-tools 2.0.32.git > makedumpfile: version 1.7.9 (released on 20 Apr 2026) > > > Error: > > While booting to crash kernel, I see below continous prints in console > logs: > > > [    0.037177] vmcore: Warning: Zero PT_NOTE entries found > [    0.037181] vmcore: Warning: Zero PT_NOTE entries found > [    0.037184] vmcore: Warning: Zero PT_NOTE entries found > [    0.037186] vmcore: Warning: Zero PT_NOTE entries found > > > And During vmcore collection, I see below error. > > > [    9.948432] systemd[1]: Starting kdump-capture.service - Kdump > Vmcore Save Service... >          Starting kdump-capture.service - Kdump Vmcore > Save Service... > > [    9.992306] kdump[408]: [0;1;38:5:185mKdump is using the default > log level(3). > [   10.158555] kdump[526]: saving to > /sysroot/var/crash/127.0.0.1-2026-04-23-06:06:27/ > [   10.164060] kdump[531]: saving vmcore-dmesg.txt to > /sysroot/var/crash/127.0.0.1-2026-04-23-06:06:27/ > [   10.198598] kdump[537]: saving vmcore-dmesg.txt complete > [   10.200376] kdump[539]: saving vmcore > > Checking for memory holes                         : [  0.0 %] / > Checking for memory holes                         : [100.0 %] | > Excluding unnecessary pages                       : [  6.3 %] \       >       WARNING: Invalid free page order: pfn=5a45fc, order=64424509439, > max order=12 > WARNING: Invalid free page order: pfn=621a02, > order=2166518513861132288, max order=12 > WARNING: Invalid free page order: pfn=6697b3, > order=6706141453275365419, max order=12 > WARNING: Invalid free page order: pfn=669b5d, order=69335804542976, > max order=12 > WARNING: Invalid free page order: pfn=66c5a8, > order=14125543804861677568, max order=12 > WARNING: Invalid free page order: pfn=66c661, order=845524441759747, > max order=12 > WARNING: Invalid free page order: pfn=67dadc, > order=17224182427472101376, max order=12 > WARNING: Invalid free page order: pfn=682b38, > order=3103260797896228864, max order=12 > WARNING: Invalid free page order: pfn=682efa, > order=14269216714183933953, max order=12 > WARNING: Invalid free page order: pfn=682efe, order=134217728, max > order=12 > WARNING: Invalid free page order: pfn=68c0a0, > order=3031209642551148544, max order=12 > WARNING: Invalid free page order: pfn=69709d, > order=17296239995740225536, max order=12 > WARNING: Invalid free page order: pfn=6aa909, > order=2166511968028983296, max order=12 > WARNING: Invalid free page order: pfn=6ae921, > order=6273236509957029888, max order=12 > WARNING: Invalid free page order: pfn=6c1456, > order=17296239987150290944, max order=12 > WARNING: Invalid free page order: pfn=6c35a4, > order=14197601399000268800, max order=12 > WARNING: Invalid free page order: pfn=6c5de2, > order=2166511933669244928, max order=12 > WARNING: Invalid free page order: pfn=6d58da, > order=17296239987150290944, max order=12 > WARNING: Invalid free page order: pfn=6d7987, > order=14557325072076374016, max order=12 > WARNING: Invalid free page order: pfn=6dbb95, > order=17944838645085110272, max order=12 > WARNING: Invalid free page order: pfn=709d7d, > order=6273234623090655232, max order=12 > WARNING: Invalid free page order: pfn=709e11, > order=3031203148023726080, max order=12 > WARNING: Invalid free page order: pfn=70c02f, > order=6705580187335000064, max order=12 > WARNING: Invalid free page order: pfn=715384, > order=14990794317172375552, max order=12 > WARNING: Invalid free page order: pfn=715aef, > order=5048255524311662592, max order=12 > WARNING: Invalid free page order: pfn=71a51e, > order=6199767839173706752, max order=12 > WARNING: Invalid free page order: pfn=71aab5, > order=5048255524311662592, max order=12 > WARNING: Invalid free page order: pfn=732e19, order=28147502510048512, > max order=12 > WARNING: Invalid free page order: pfn=739896, > order=17296239987150290944, max order=12 > WARNING: Invalid free page order: pfn=73b956, > order=17296239991445258240, max order=12 > WARNING: Invalid free page order: pfn=73e043, > order=2166511933669244928, max order=12 > WARNING: Invalid free page order: pfn=740049, > order=6705582074453032960, max order=12 > WARNING: Invalid free page order: pfn=760109, > order=6345294104196284416, max order=12 > WARNING: Invalid free page order: pfn=760260, > order=2166511968028983296, max order=12 > WARNING: Invalid free page order: pfn=774eb8, > order=3103267236521967616, max order=12 > WARNING: Invalid free page order: pfn=77949f, > order=3103260802191196160, max order=12 > WARNING: Invalid free page order: pfn=784ac6, order=1971974104455872, > max order=12 > WARNING: Invalid free page order: pfn=785196, > order=2166518513861132288, max order=12 > WARNING: Invalid free page order: pfn=790654, > order=14557325072177037312, max order=12 > WARNING: Invalid free page order: pfn=792cbe, > order=13837309858646983424, max order=12 > WARNING: Invalid free page order: pfn=792dbe, > order=13837309859722035968, max order=12 > WARNING: Invalid free page order: pfn=793779, > order=15351363758810792960, max order=12 > WARNING: Invalid free page order: pfn=7963af, > order=2166511933669244928, max order=12 > WARNING: Invalid free page order: pfn=7bda8a, > order=13837313428760297472, max order=12 > WARNING: Invalid free page order: pfn=7bfbfa, > order=14269094696377647104, max order=12 > WARNING: Invalid free page order: pfn=7c8498, > order=18088873534452400128, max order=12 > WARNING: Invalid free page order: pfn=7d4bf7, order=1441792, max order=12 > WARNING: Invalid free page order: pfn=7db498, > order=18088873534452400128, max order=12 > WARNING: Invalid free page order: pfn=7dba0d, > order=6345292217329909760, max order=12 > WARNING: Invalid free page order: pfn=7dc618, > order=3319440018652528640, max order=12 > WARNING: Invalid free page order: pfn=7e8788, > order=1113619897082537567, max order=12 > readpage_elf: Attempt to read non-existent page at 0x20000000. > readmem: type_addr: 0, addr:c00c000020000000, size:32768 > __exclude_unnecessary_pages: Can't read the buffer of struct page. > create_2nd_bitmap: Can't exclude unnecessary pages. > > makedumpfile Failed. > [   10.687238] kdump[542]: saving vmcore failed, exitcode:1 > [   10.689073] kdump[544]: saving vmcore failed > [   10.699975] kdump[549]: saving the /run/initramfs/kexec-dmesg.log > to /sysroot/var/crash/127.0.0.1-2026-04-23-06:06:27/// > [   10.701749] systemd[1]: kdump-capture.service: Main > process exited, code=exited, status=1/FAILURE > [   10.701933] systemd[1]: [0;1;38:5:185mkdump-capture.service: > Failed with result 'exit-code'. > [FAILED] Failed to start > kdump-capture.service - Kdump Vmcore Save Service. > > [   10.702090] systemd[1]: Failed to start > kdump-capture.service - Kdump Vmcore Save Service. > See 'systemctl status kdump-capture.service' for details. > > [   10.702249] systemd[1]: Startup finished in 3.351s (kernel) + 0 > (initrd) + 7.350s (userspace) = 10.702s. > [   10.702388] systemd[1]: kdump-capture.service: Triggering > OnFailure= dependencies. > [   10.703543] systemd[1]: Stopped target timers.target - Timer Units. > > > > If you happen to fix, this please add below tag. > > > Reported-by: Venkat Rao Bagalkote > > > Regards, > > Venkat. > >