Messages in this thread | | | Date | Mon, 8 Nov 2021 09:12:00 +0100 | From | Peter Zijlstra <> | Subject | Re: DEAD callback error for CPU, WARNING: CPU: 3 PID: 1134 at kernel/cpu.c:1163 _cpu_down+0x20a/0x3a0 |
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On Sun, Nov 07, 2021 at 11:59:17AM +0000, Colin King (gmail) wrote: > On a SMP system in a VM, a deadlock callback error can be reproduced with > 5.15, tested from head at commit d4439a1189f93d0ac1eaf0197db8e6b3e197d5c7 > > Didn't see this issue on 5.13 > > How to reproduce: > > git clone https://github.com/ColinIanKing/stress-ng > cd stress-ng > make -j $(nproc) > sudo ./stress-ng --cpu-online 0 -t 15 --pathological > > Tested on a 8 thread virtual machine, 4MB of memory. > > [ 2239.378724] smpboot: CPU 6 is now offline > [ 2239.379443] smpboot: Booting Node 0 Processor 6 APIC 0x6 > [ 2239.380169] kvm-clock: cpu 6, msr 79201181, secondary cpu clock > [ 2239.401652] ------------[ cut here ]------------ > [ 2239.401658] DEAD callback error for CPU6 > [ 2239.401721] WARNING: CPU: 3 PID: 1134 at kernel/cpu.c:1163 > _cpu_down+0x20a/0x3a0
Can you do the same with whatever magic is required to get the pr_debug() output from cpuhp_down_callbacks() included?
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