Your message dated Thu, 10 Mar 2016 17:34:54 +0000 with message-id <1457631294.3001.54.camel@decadent.org.uk> and subject line Re: Bug#817816: System freeze with CPU hotplug has caused the Debian Bug report #817816, regarding System freeze with CPU hotplug to be marked as done. This means that you claim that the problem has been dealt with. If this is not the case it is now your responsibility to reopen the Bug report if necessary, and/or fix the problem forthwith. (NB: If you are a system administrator and have no idea what this message is talking about, this may indicate a serious mail system misconfiguration somewhere. Please contact owner@bugs.debian.org immediately.) -- 817816: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=817816 Debian Bug Tracking System Contact owner@bugs.debian.org with problems
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- To: "submit@bugs.debian.org" <submit@bugs.debian.org>
- Subject: System freeze with CPU hotplug
- From: Harry Junior <harryjr@outlook.fr>
- Date: Thu, 10 Mar 2016 17:32:17 +0100
- Message-id: <[🔎] SNT148-W411171A69435B017994B7AC1B40@phx.gbl>
Package: linux-image-4.4.0-1-amd64 Version: 4.4.4-1 Severity: critical Justification: renders system unusable When I run the following commands, the system freezes: # echo 0 | tee /sys/devices/system/cpu/cpu*/online && echo 1 | sudo tee /sys/devices/system/cpu/cpu*/online The system freezes randomly when the CPUs are being onlined or offlined. The system is installed on a VMware virtual machine with 4 processors. Here's a stacktrace of the infinite loop: -----------------------------------------------------------------------------------------------------------------------[regs] RAX: 0xFFFFFFFF8160AC40 RBX: 0x0000000000000003 RCX: 0x0000000000000000 RDX: 0x0000000000000003 o d i t s Z a P c RSI: 0x0000000000000286 RDI: 0xFFFF88004E6B7D98 RBP: 0xFFFF88004E6B7D98 RSP: 0xFFFF88007CFCFDC0 RIP: 0xFFFFFFFF8110AD52 R8 : 0xFFFF88007F60F380 R9 : 0x0000000000000000 R10: 0xFFFFFFFF81B004C0 R11: 0x0000000000000000 R12: 0xFFFF88004E6B7DBC R13: 0x0000000000000282 R14: 0xFFFF88007F60F300 R15: 0xFFFFFFFF8110AD10 CS: 0010 DS: 0000 ES: 0000 FS: 0000 GS: 0000 SS: 0018 -----------------------------------------------------------------------------------------------------------------------[code] => 0xffffffff8110ad52 <multi_cpu_stop+66>: mov ebx,DWORD PTR [rbp+0x20] 0xffffffff8110ad55 <multi_cpu_stop+69>: cmp edx,ebx 0xffffffff8110ad57 <multi_cpu_stop+71>: je 0xffffffff8110ad74 <multi_cpu_stop+100> 0xffffffff8110ad59 <multi_cpu_stop+73>: cmp ebx,0x2 0xffffffff8110ad5c <multi_cpu_stop+76>: je 0xffffffff8110ad9e <multi_cpu_stop+142> 0xffffffff8110ad5e <multi_cpu_stop+78>: cmp ebx,0x3 0xffffffff8110ad61 <multi_cpu_stop+81>: jne 0xffffffff8110ad68 <multi_cpu_stop+88> 0xffffffff8110ad63 <multi_cpu_stop+83>: test r14b,r14b ----------------------------------------------------------------------------------------------------------------------------- multi_cpu_stop (data=0xffff88004e6b7d98) at /build/linux-xT7CCq/linux-4.4.4/kernel/stop_machine.c:197 197 /build/linux-xT7CCq/linux-4.4.4/kernel/stop_machine.c: No such file or directory. gdb$ bt #0 multi_cpu_stop (data=0xffff88004e6b7d98) at /build/linux-xT7CCq/linux-4.4.4/kernel/stop_machine.c:197 #1 0xffffffff8110afed in cpu_stopper_thread (cpu=<optimized out>) at /build/linux-xT7CCq/linux-4.4.4/kernel/stop_machine.c:456 #2 0xffffffff81097d49 in smpboot_thread_fn (data=0xffff88004e6b7d98) at /build/linux-xT7CCq/linux-4.4.4/kernel/smpboot.c:163 #3 0xffffffff81094dfd in kthread (_create=0xffff88007ce82100) at /build/linux-xT7CCq/linux-4.4.4/kernel/kthread.c:209 #4 0xffffffff8158ed8f in ret_from_fork () at /build/linux-xT7CCq/linux-4.4.4/arch/x86/entry/entry_64.S:486 #5 0x0000000000000000 in ?? () gdb$ x/x $rbp+0x20 0xffff88004e6b7db8: 0x00000003 In the function multi_cpu_stop(), curstate equals MULTI_STOP_RUN and seems to never become equal to MULTI_STOP_EXIT. Let me know if you require additional informations. Thanks
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--- Begin Message ---
- To: 817816-done@bugs.debian.org
- Subject: Re: Bug#817816: System freeze with CPU hotplug
- From: Ben Hutchings <ben@decadent.org.uk>
- Date: Thu, 10 Mar 2016 17:34:54 +0000
- Message-id: <1457631294.3001.54.camel@decadent.org.uk>
- In-reply-to: <[🔎] SNT148-W411171A69435B017994B7AC1B40@phx.gbl>
- References: <[🔎] SNT148-W411171A69435B017994B7AC1B40@phx.gbl>
On Thu, 2016-03-10 at 17:32 +0100, Harry Junior wrote: > Package: linux-image-4.4.0-1-amd64 > Version: 4.4.4-1 > Severity: critical > Justification: renders system unusable > > > When I run the following commands, the system freezes: > > # echo 0 | tee /sys/devices/system/cpu/cpu*/online && echo 1 | sudo > tee /sys/devices/system/cpu/cpu*/online > > The system freezes randomly when the CPUs are being onlined or > offlined. The system is installed on a VMware virtual machine with 4 > processors. Here's a stacktrace of the infinite loop: [...] You just asked to offline all CPUs, making the system unusable. I don't see any bug here. Ben. -- Ben Hutchings To err is human; to really foul things up requires a computer.Attachment: signature.asc
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