[Xen-users] unable to shutdown (page fault in mwait_idle()/do_dbs_timer()/__find_next_bit())

[Martin Cerveny <martin@xxxxxxxxx>]

Hello.

I cannot shutdown XEN4.10 (probability 10%) with crash during "Preparing system for 
ACPI S5 state."

[ 1369.468861] ACPI: Preparing to enter system sleep state S5^M
[ 1369.516061] reboot: Power down^M
(XEN) Preparing system for ACPI S5 state.
(XEN) Disabling non-boot CPUs ...
(XEN) Broke affinity for irq 139
(XEN) Broke affinity for irq 140
(XEN) Broke affinity for irq 83
(XEN) Broke affinity for irq 141
(XEN) Broke affinity for irq 138
(XEN) ----[ Xen-4.10.0-vgpu  x86_64  debug=n   Not tainted ]----
(XEN) CPU:    23
(XEN) RIP:    e008:[<ffff82d08026ae60>] __find_next_bit+0x10/0x80
(XEN) RFLAGS: 0000000000010206   CONTEXT: hypervisor
(XEN) rax: 0000000000000000   rbx: ffff830879db0400   rcx: 0000000000000018
(XEN) rdx: 0000000000000018   rsi: 0000000000000018   rdi: 0000000000000000
(XEN) rbp: 00000000061be65c   rsp: ffff83104eaafdd8   r8:  0000000000000018
(XEN) r9:  ffff830879db6d70   r10: ffff830879db28e8   r11: 0000014161aecbf1
(XEN) r12: 0000000000000000   r13: ffff8308788cef80   r14: ffff82d0805614e0
(XEN) r15: 0000000000000017   cr0: 000000008005003b   cr4: 00000000001526e0
(XEN) cr3: 000000007da2f000   cr2: 0000000000000000
(XEN) fsb: 0000000000000000   gsb: 0000000000000000   gss: 0000000000000000
(XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: 0000   cs: e008
(XEN) Xen code around <ffff82d08026ae60> (__find_next_bit+0x10/0x80):
(XEN)  e1 3f 48 8d 3c c7 74 25 <4c> 8b 0f 41 b8 40 00 00 00 41 29 c8 49 d3 e9 49
(XEN) Xen stack trace from rsp=ffff83104eaafdd8:
(XEN)    ffff82d080253180 0000000000000017 ffff830800000018 ffff82d080577380
(XEN)    00200f0879db6d98 000001415ff7b66d 0000000000000004 ffff830879db6e40
(XEN)    ffff82d08054ac80 000001415ff7b66d 0000000000000017 0000000000000017
(XEN)    ffff82d0802c7c0e ffff830879db0300 000001415a01f82d ffff830879db6ef8
(XEN)    0000002000000008 000012340000152e 0000000000000000 0000000000000000
(XEN)    0000001900000001 ffff82e028c4b300 ffff82000007ffff ffff82d080552c80
(XEN)    ffff82d08054b800 ffff82d0805771f0 0000000000000017 0000000000000017
(XEN)    ffff82d0805614e0 ffff82d080420e80 ffff82d08026fa56 000000fd00000000
(XEN)    ffff83104eaaffff ffff83007ddf5000 ffff83007ddf5000 ffff83007ddf5000
(XEN)    ffff830879db0180 ffff830879db0188 000001415a00df4b ffff82d0805614e0
(XEN)    0000000000000002 0000000000008000 0000000000000004 0000000000000000
(XEN)    0000000000000000 0000000000000050 0000000000000000 0000000000000000
(XEN)    0000000000000203 0000000000000000 0000000000002001 0000000000000001
(XEN)    000000000000b004 000000000000b000 000000000000b000 000000fa00000000
(XEN)    fffff80002a0910c 0000000000000000 0000000000000002 fffff88002ffb840
(XEN)    0000000000000000 0000000000000000 0000000000000000 0000000000000000
(XEN)    0000000000000000 0000000000000017 ffff83007ddf5000 00000037f9839080
(XEN)    00000000001526e0
(XEN) Xen call trace:
(XEN)    [<ffff82d08026ae60>] __find_next_bit+0x10/0x80
(XEN)    [<ffff82d080253180>] cpufreq_ondemand.c#do_dbs_timer+0x160/0x220
(XEN)    [<ffff82d0802c7c0e>] mwait-idle.c#mwait_idle+0x23e/0x340
(XEN)    [<ffff82d08026fa56>] domain.c#idle_loop+0x86/0xc0
(XEN)
(XEN) Pagetable walk from 0000000000000000:
(XEN)  L4[0x000] = 000000087ffeb063 ffffffffffffffff
(XEN)  L3[0x000] = 000000087ffea063 ffffffffffffffff
(XEN)  L2[0x000] = 000000087ffe9063 ffffffffffffffff
(XEN)  L1[0x000] = 0000000000000000 ffffffffffffffff
(XEN)
(XEN) ****************************************
(XEN) Panic on CPU 23:
(XEN) FATAL PAGE FAULT
(XEN) [error_code=0000]
(XEN) Faulting linear address: 0000000000000000
(XEN) ****************************************
(XEN)
(XEN) Reboot in five seconds...
(XEN) Resetting with ACPI MEMORY or I/O RESET_REG.

Known problem ?
How to fix it ?

Thanks, Martin

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