-----Message d'origine----- De : HAGIO KAZUHITO(萩尾 一仁) <k-hagio-ab@xxxxxxx> Envoyé : mercredi 6 avril 2022 09:48 À : Agrain Patrick <patrick.agrain@xxxxxxxxxxxxxxxxx> Cc : Discussion list for crash utility usage, maintenance and development <crash-utility@xxxxxxxxxx>; kexec@xxxxxxxxxxxxxxxxxxx Objet : RE: EXT: RE: crash: read error on type: "memory section root table" -----Original Message----- > Hello, > > Suggested trace above gives following information after a crash -d 8 command: > <...> > kernel NR_CPUS: 2 > <readmem: ffffffffa4925820, KVADDR, "high_memory", 8, (FOE), > 56017b542648> > <read_diskdump: addr: ffffffffa4925820 paddr: 12925820 cnt: 8> > read_diskdump: paddr/pfn: 12925820/12925 -> cache physical page: > 12925000 > GETBUF(328 -> 0) > FREEBUF(0) > GETBUF(328 -> 0) > FREEBUF(0) > PAGESIZE=4096 > mem_section_size = 16384 > NR_SECTION_ROOTS = 2048 > NR_MEM_SECTIONS = 524288 > SECTIONS_PER_ROOT = 256 > SECTION_ROOT_MASK = 0xff > PAGES_PER_SECTION = 32768 > <readmem: ffffffffa4926db0, KVADDR, "mem_section", 8, (FOE), > 7ffd1b6bb000> > <read_diskdump: addr: ffffffffa4926db0 paddr: 12926db0 cnt: 8> > read_diskdump: paddr/pfn: 12926db0/12926 -> cache physical page: > 12926000 > <readmem: ffff904c7f7fc000, KVADDR, "memory section root table", > 16384, (FOE), 56017da26fd0> > <read_diskdump: addr: ffff904c7f7fc000 paddr: 3f7fc000 cnt: 4096> > read_diskdump: paddr/pfn: 3f7fc000/3f7fc -> cache physical page: > 3f7fc000 > crash: PAG3 - errno=2 r=0 pd.size=49 > read_diskdump: READ_ERROR: cannot cache page: 3f7fc000 > crash: read error: kernel virtual address: ffff904c7f7fc000 type: "memory section root table" hmm, r=0 means end of file, can you check again whether pd.offset exceeds the dumpfile size? If so, somehow the dumpfile is shorter than expected. Indeed, the offset points outside the dumpfile: Get: crash: PAG3 - errno=2 r=0 pd.size=52 pd.offset=168956485 with a dumpfile 164820 -rw-r--r--. 1 root root 168775680 6 avril 17:23 crashdump--20220406-1713 And another one: Get: crash: PAG3 - errno=2 r=0 pd.size=49 pd.offset=215640649 with a dumpfile 209984 -rw-r--r--. 1 root root 215023616 1 avril 10:58 crashdump-585.000-20220401-1054 I think a RHEL-based kexec-tools does "sync" after makedumpfile, but can you check? Actually, we are executing the makedumpfile in a script designated as init file for the second kernel. Therefore, we do not perform the sync as per core_collector. Thanks, Kazu Best regards, Patrick -- Crash-utility mailing list Crash-utility@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/crash-utility Contribution Guidelines: https://github.com/crash-utility/crash/wiki
