Ubuntu
linux package

5.13 RT kernel hangs on SMP shutdown

Bug #1938048 reported by Colin Ian King
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Invalid
Medium
Joseph Salisbury

Bug Description

shutting down RT SMP 5.13 impish kernels in kvm-qemu is hanging in 1 in 20 or so reboots. gdb shows the hang is as follows:

#0 0xffffffff81044f72 in native_halt () at /home/cking/rt-impish/impish/arch/x86/include/asm/irqflags.h:57
#1 stop_this_cpu (dummy=dummy@entry=0x0 <fixed_percpu_data>) at /home/cking/rt-impish/impish/arch/x86/kernel/process.c:744
#2 0xffffffff8106f70c in __sysvec_reboot (regs=<optimized out>) at /home/cking/rt-impish/impish/arch/x86/kernel/smp.c:138
#3 0xffffffff81c5f4f7 in sysvec_reboot (regs=0xffffffff82e03d78) at /home/cking/rt-impish/impish/arch/x86/kernel/smp.c:134
#4 0xffffffff81e00e02 in asm_sysvec_reboot () at /home/cking/rt-impish/impish/arch/x86/include/asm/idtentry.h:654

this gets stuck in:

asm volatile("hlt": : :"memory");

Colin Ian King (colin-king)
Changed in linux (Ubuntu):
assignee: nobody → Colin Ian King (colin-king)
importance: Undecided → High
status: New → In Progress
Colin Ian King (colin-king)
Changed in linux (Ubuntu):
assignee: Colin Ian King (colin-king) → Krzysztof Kozlowski (krzk)
status: In Progress → Triaged
importance: High → Medium
Joseph Salisbury (jsalisbury)
Changed in linux (Ubuntu):
assignee: Krzysztof Kozlowski (krzk) → Joseph Salisbury (jsalisbury)
Revision history for this message
Joseph Salisbury (jsalisbury) wrote :

Could not reproduce in 5.15.

Changed in linux (Ubuntu):
status: Triaged → Incomplete
status: Incomplete → Invalid
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