https://www.dropbox.com/s/k117zefr83k6b11/ppc64%20bt.png?dl=0 is the backtrace gdb reports from that core, helpful as it is.
I actually originally had this happen on qemu 5.2, then I upgraded to 6.1 to see if it went away (it does not, and it happily reproduces on fresh upgrade each time). - Rich On Thu, Jan 6, 2022 at 3:36 AM Rich <rincebr...@gmail.com> wrote: > Hi Aurelien, > It's a VM running in qemu on an amd64 Debian bullseye system, no KVM > acceleration to be found here. > > dmesg doesn't have any backtraces - the two messages that show up are > py3compile segfaulting with all the addresses printed as xxxxxxxx instead, > and a couple of programs (like mandb) reporting getting a pointer of > 0xfffffffffffffff1 or similar and dying in a fire. > > The first ones after the upgrade: > Jan 6 01:30:39 encrepro kernel: [ 6715.078626] mandb[1903]: User access > of kernel address (ffffffffffff8408) - exploit attempt? (uid: 6) > Jan 6 01:30:39 encrepro kernel: [ 6715.093977] mandb[1903]: segfault (11) > at ffffffffffff8408 nip 7fffb37f5f28 lr 7fffb37f5f08 code 1 in > libseccomp.so.2.5.3[7fffb37f0000+30000] > Jan 6 01:30:39 encrepro kernel: [ 6715.100149] mandb[1903]: code: > fbe10078 38800000 7c7f1b78 4bffddfd e8410028 2c030000 41800030 ebe10078 > Jan 6 01:30:39 encrepro kernel: [ 6715.100308] mandb[1903]: code: > 38600000 38210080 60000000 e8010010 <906283f8> 7c6307b4 7c0803a6 4e800020 > Jan 6 01:31:31 encrepro kernel: [ 6767.287646] reportbug[1982]: segfault > (11) at 34c8 nip 34c8 lr 34c8 code 1 in python3.9[10000000+5d0000] > Jan 6 01:31:31 encrepro kernel: [ 6767.293334] reportbug[1982]: code: > XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX > Jan 6 01:31:31 encrepro kernel: [ 6767.293545] reportbug[1982]: code: > XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX > > And later: > > Jan 6 01:35:30 encrepro systemd[2290]: free(): invalid pointer > > and > > Jan 6 01:42:53 encrepro systemd[1]: Created slice User Slice of UID 1000. > Jan 6 01:42:53 encrepro systemd[1]: Starting User Runtime Directory > /run/user/1000... > Jan 6 01:42:53 encrepro systemd[1]: Finished User Runtime Directory > /run/user/1000. > Jan 6 01:42:53 encrepro systemd[1]: Starting User Manager for UID 1000... > Jan 6 01:42:53 encrepro systemd[2370]: free(): invalid pointer > Jan 6 01:42:54 encrepro systemd[1]: user@1000.service: Main process > exited, code=killed, status=6/ABRT > Jan 6 01:42:54 encrepro systemd[1]: user@1000.service: Failed with > result 'signal'. > Jan 6 01:42:54 encrepro systemd[1]: Failed to start User Manager for UID > 1000. > > I've got a core dump from mandb: > https://www.dropbox.com/s/4z6bfbuluwub29r/ppc64_libc?dl=0 > > I don't have a stacktrace from it, though, since I didn't already have gdb > on the VM, and it wants to upgrade libc to install. (I know I could go find > an appropriately old section of snapshots.debian.org, but haven't done > that yet...) > > - Rich > > On Thu, Jan 6, 2022 at 3:13 AM Aurelien Jarno <aurel...@aurel32.net> > wrote: > >> control: tag -1 + help >> control: user debian-powe...@lists.debian.org >> control: usertag -1 ppc64 >> >> On 2022-01-06 01:45, Rich Ercolani wrote: >> > Package: libc6 >> > Version: 2.33-1 >> > Severity: important >> > X-Debbugs-Cc: rincebr...@gmail.com >> > >> > Dear Maintainer, >> > >> > (I marked this as serious because it's "just" ppc64, but the system is >> permaneantly unusable if this upgrade is installed.) >> >> I have added the powerpc list in Cc: as the ppc64 porters are the people >> who can help you there. >> >> > I booted my ppc64 VM in qemu 6.1, apt update, apt upgrade, and 20-30 >> packages in, it died horribly >> > with Python3 packages erroring out with "Cannot get content of >> [whatever package]". >> >> Is it a VM running with KVM or is it using QEMU emulation? >> >> > Trying to log into a shell over ssh or at a tty after this happens dies >> with an error that flashes fast, but >> > but seems to be "free(): invalid pointer" >> > >> > Random applications will now just crash out, in addition to the >> obvious. (I'm writing this from a session >> > spawned before the upgrade, which can still spawn children successfully >> until I log out.) >> > >> > If I reboot after upgrading, all services fail to start on boot, and it >> never spawns a login prompt or rescue >> > prompt, it just sits forever on a list of failed service starts. >> > >> > Anything that would be helpful to debug this? I have a snapshot of the >> VM before this began, so I can >> > just roll it back and repeat the exercise. >> >> Ideally a backtrace would help, dmesg outputs can also be useful, >> however given the state of you system, they might be difficult to get. >> >> Regards, >> Aurelien >> >> -- >> Aurelien Jarno GPG: 4096R/1DDD8C9B >> aurel...@aurel32.net http://www.aurel32.net >> >
