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Xen crash in scheduler during cpu hotplug


  • To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Wed, 15 May 2024 12:58:32 +0100
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  • Delivery-date: Wed, 15 May 2024 11:58:46 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

Just so it doesn't get lost.  In XenRT, we've found:

> (XEN) ----[ Xen-4.19.0-1-d  x86_64  debug=y  Tainted:     H  ]----
> (XEN) CPU:    45
> (XEN) RIP:    e008:[<ffff82d040244cbf>]
> common/sched/credit.c#csched_load_balance+0x41/0x877
> (XEN) RFLAGS: 0000000000010092   CONTEXT: hypervisor
> (XEN) rax: ffff82d040981618   rbx: ffff82d040981618   rcx:
> 0000000000000000
> (XEN) rdx: 0000003ff68cd000   rsi: 000000000000002d   rdi:
> ffff83103723d450
> (XEN) rbp: ffff83207caa7d48   rsp: ffff83207caa7b98   r8: 
> 0000000000000000
> (XEN) r9:  ffff831037253cf0   r10: ffff83103767c3f0   r11:
> 0000000000000009
> (XEN) r12: ffff831037237990   r13: ffff831037237990   r14:
> ffff831037253720
> (XEN) r15: 0000000000000000   cr0: 000000008005003b   cr4:
> 0000000000f526e0
> (XEN) cr3: 000000005bc2f000   cr2: 0000000000000010
> (XEN) fsb: 0000000000000000   gsb: 0000000000000000   gss:
> 0000000000000000
> (XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: 0000   cs: e008
> (XEN) Xen code around <ffff82d040244cbf>
> (common/sched/credit.c#csched_load_balance+0x41/0x877):
> (XEN)  48 8b 0c 10 48 8b 49 08 <48> 8b 79 10 48 89 bd b8 fe ff ff 49
> 8b 4e 28 48
> <snip>
> (XEN) Xen call trace:
> (XEN)    [<ffff82d040244cbf>] R
> common/sched/credit.c#csched_load_balance+0x41/0x877
> (XEN)    [<ffff82d040245a18>] F
> common/sched/credit.c#csched_schedule+0x36a/0x69f
> (XEN)    [<ffff82d040252644>] F common/sched/core.c#do_schedule+0xe8/0x433
> (XEN)    [<ffff82d0402572dd>] F common/sched/core.c#schedule+0x2e5/0x2f9
> (XEN)    [<ffff82d040232f35>] F common/softirq.c#__do_softirq+0x94/0xbe
> (XEN)    [<ffff82d040232fc8>] F do_softirq+0x13/0x15
> (XEN)    [<ffff82d0403075ef>] F arch/x86/domain.c#idle_loop+0x92/0xe6
> (XEN)
> (XEN) Pagetable walk from 0000000000000010:
> (XEN)  L4[0x000] = 000000103ffca063 ffffffffffffffff
> (XEN)  L3[0x000] = 000000103ffc9063 ffffffffffffffff
> (XEN)  L2[0x000] = 000000103ffc8063 ffffffffffffffff
> (XEN)  L1[0x000] = 0000000000000000 ffffffffffffffff
> (XEN)
> (XEN) ****************************************
> (XEN) Panic on CPU 45:
> (XEN) FATAL PAGE FAULT
> (XEN) [error_code=0000]
> (XEN) Faulting linear address: 0000000000000010
> (XEN) ****************************************

which we can reproduce reliably enough with a shell script doing
xen-hptool cpu-{off,on}line.

~Andrew



 


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