Re: [Crash-utility] arm64: doesn't work for kernel v5.4?

On Tue, Oct 08, 2019 at 04:55:48PM -0400, Dave Anderson wrote: > > > ----- Original Message ----- > > > Hi Dave, > > > > > > I tried to use crash v7.2.7 with kernel v5.4-rc1 on arm64. > > > > > > 1. VA_BITS_ACTUAL is missing in vmcoreinfo. > > > Does anyone work on fixing it on kernel side? > > > (just adding one or two lines though) > > > > > > 2. With a tweak above, I still fail to run crash with vmcore > > > seeing the following errors; > > > (I didn't dig into details) > > > > > > crash-arm64: invalid kernel virtual address: ffff800010c689a8 type: > > > "kernel_config_data" > > > WARNING: cannot read kernel_config_data > > > crash-arm64: invalid kernel virtual address: ffff80001177a160 type: > > > "possible" > > > WARNING: cannot read cpu_possible_map > > > crash-arm64: invalid kernel virtual address: ffff80001177a140 type: > > > "present" > > > WARNING: cannot read cpu_present_map > > > crash-arm64: invalid kernel virtual address: ffff80001177a120 type: > > > "online" > > > WARNING: cannot read cpu_online_map > > > crash-arm64: invalid kernel virtual address: ffff80001177a188 type: > > > "active" > > > WARNING: cannot read cpu_active_map > > > crash-arm64: invalid kernel virtual address: ffff80001196afe0 type: > > > "shadow_timekeeper xtime_sec" > > > crash-arm64: invalid kernel virtual address: ffff800011782b3c type: > > > "init_uts_ns" > > > WARNING: invalid linux_banner pointer: ffff800010c500e8 > > > crash: vmlinux.1003 and vmcore.1003 do not match! > > > > > > Have you noticed this issue? > > > > I have been waiting for our internal 5.4-rc1 based ARK kernel to be > > built, > > and it looks like it should be available soon. But I did not expect > > crash > > to work on arm64 in 5.4. > > > > I put in a bunch of 52-bit support into the crash utility last spring, > > but > > it was based upon an early proposed patch-set from Steve Capper that > > Chris > > von Recklinghausen backported to our 4.18.0-80.el8 kernel at the time. > > I believe Chris may have added the VA_BITS_ACTUAL vmcoreinfo entry (?), > > and I'm presuming there will be other VM-related things that are > > different from that original kernel patch. > > > > Thanks, > > Dave > > I still haven't got a 5.4-rc1 kernel to test with, but Chris Von > Recklinghausen > has backported the latest upstream 52-bit patch-set to a 4.18-based kernel. > However, it did require one additional patch needed for crash to run live > on /proc/kcore, which he posted on the arm list today: > > [PATCH] arm64: remove arm64 definitions of kc_vaddr_to_offset and > kc_offset_to_vaddr. > http://lists.infradead.org/pipermail/linux-arm-kernel/2019-October/685109... > > With his patch-set (including the above), crash-7.2.7 comes up unmodified > on > a live system -- albeit one which downgrades from 52 bits to 48 bits. Chris is > going to test crash running live on a 52 bit simulator tomorrow. I may misunderstand something, but even after applying this patch, nothing has changed, at least, against /proc/vmcore. (I see the same errors.)

Thanks, -Takahiro Akashi > Dave > > -- > Crash-utility mailing list > Crash-utility(a)redhat.com > https://www.redhat.com/mailman/listinfo/crash-utility -- Crash-utility mailing list Crash-utility(a)redhat.com https://www.redhat.com/mailman/listinfo/crash-utility