On 29. 03. 2020. 21:27, John Paul Adrian Glaubitz wrote: > On 3/29/20 8:16 PM, Miroslav Zubcic wrote:
>> varnava login: [ 4888.989100] Unable to handle kernel NULL pointer >> dereference >> [ 4889.057151] tsk->{mm,active_mm}->context = 00000000000000ce >> [ 4889.124099] tsk->{mm,active_mm}->pgd = fff0001375888000 >> [ 4889.187349] Kernel panic - not syncing: Attempted to kill init! >> exitcode=0x00000009 >> [ 4889.279315] Press Stop-A (L1-A) from sun keyboard or send break >> [ 4889.279315] twice on console to return to the boot prom >> [ 4889.279345] kernel BUG at kernel/cpu.c:941! >> >> (...) >> Does anybody have some information or experience with this phenomenon? > I think I have seen instability issues on the one IIIi machine we have > as well as this machine is running 4.19 for that reason. Other machines > such as the T2 or later models don't show any issues. > > So, I think this issue needs to be bisected and reported to the SPARC > Linux kernel mailing list [1]. I'm CC'ing Meelis Roos who has been doing > a lot of kernel regression testing on sparc64 in the past and might have > already found the problematic commit. Hi Adrian, Ok since now I have plenty of time during this global stay at home times, I'm willing to do any debugging you propose, test things etc. Here is more info on machine: 1. Two kernel panics from my 1st mail was from different kernels. Unfortunately, the second one (with apt remove exim) was from couple months ago. This are kernels which I have in GRUB: 4.19.0-5-sparc64-smp 5.3.0-2-sparc64-smp 5.4.0-3-sparc64-smp 5.4.0-4-sparc64-smp 5.4.1 5.5.0 Last two are compiled from source. Only 4.19.0-5 works. root@varnava:~# cat /proc/cpuinfo cpu : TI UltraSparc IIIi (Jalapeno) fpu : UltraSparc IIIi integrated FPU pmu : ultra3i prom : OBP 4.30.4 2009/08/19 07:14 type : sun4u ncpus probed : 2 ncpus active : 2 D$ parity tl1 : 0 I$ parity tl1 : 0 cpucaps : flush,stbar,swap,muldiv,v9,ultra3,mul32,div32,v8plus,vis,vis2 Cpu0ClkTck : 000000005f5e1000 Cpu1ClkTck : 000000005f5e1000 MMU Type : Cheetah+ MMU PGSZs : 8K,64K,512K,4MB State: CPU0: online CPU1: online - Debian system is routinely up to date with packages. - OBP has the latest patch which I obtained: Sun Ultra 45 Workstation, No Keyboard Copyright 2009 Sun Microsystems, Inc. All rights reserved. OpenBoot 4.30.4, 14336 MB memory installed, Serial #68142416. Ethernet address 0:14:4f:f:c1:6d, Host ID: 840fc16d. So, the problem is usually triggered by systemd or it's systemctl. Maybe some new fancy syscall or who knows what. :-) -- Not every internet quote is true. -- Oscar Wilde