Opened 4 years ago
Closed 4 years ago
#19902 closed defect (fixed)
Crash due to invalid assumption (unsigned wrap around) in vgsvcCpuHotPlugGetACPIDevicePath (VBoxService) => fixed in SVN/next maintenance
| Reported by: | musteresel | Owned by: | |
|---|---|---|---|
| Component: | guest additions | Version: | VirtualBox 6.1.6 |
| Keywords: | hotplug | Cc: | |
| Guest type: | Linux | Host type: | Linux |
Description
TL;DR: There's an unsigned integer "underflow"/wrap around of the variable iLvlCurr in the function vgsvcCpuHotPlugGetACPIDevicePath in src/VBox/Additions/common/VBoxService/VBoxServiceCpuHotPlug.cpp
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When I try to unplug a CPU (initiated from the host to a linux guest with guest additions installed and VBoxService running) then I get a segmentation fault in the guest additions code, most certainly in the vgsvcCpuHotPlugGetACPIDevicePath function (src/VBox/Additions/common/VBoxService/VBoxServiceCpuHotPlug.cpp). On the host side I get an error that the CPU couldn't be safely unplugged:
$ VBoxManage controlvm nixos-vm unplugcpu 2 VBoxManage: error: Hot-Remove was aborted because the CPU may still be used by the guest VBoxManage: error: Details: code VBOX_E_VM_ERROR (0x80bb0003), component ConsoleWrap, interface IConsole, callee nsISupports VBoxManage: error: Context: "HotUnplugCPU(n)" at line 427 of file VBoxManageControlVM.cpp
The code (in VBoxService) actually contains an assertion which shows the (invalid) assumption which causes this crash:
Here's the output from VBoxService -f -vvvv run from within gdb:
Reading symbols from /run/current-system/sw/bin/VBoxService... warning: Loadable section ".dynsym" outside of ELF segments warning: Loadable section ".dynstr" outside of ELF segments (No debugging symbols found in /run/current-system/sw/bin/VBoxService) (gdb) run -f -vvvv Starting program: /nix/store/w3j8lnbn641g9hc1ghq3l6bz9cb10ba8-system-path/bin/VBoxService -f -vvvv [Thread debugging using libthread_db enabled] Using host libthread_db library "/nix/store/xg6ilb9g9zhi2zg1dpi4zcp288rhnvns-glibc-2.30/lib/libthread_db.so.1". [New Thread 0x7fffeac5c700 (LWP 19725)] [New Thread 0x7fffea45b700 (LWP 19726)] [Thread 0x7fffea45b700 (LWP 19726) exited] [Thread 0x7fffeac5c700 (LWP 19725) exited] 23:36:57.721123 main VBoxService 6.1.6 r137129 (verbosity: 4) linux.amd64 (Apr 9 2020 19:52:18) release log 23:36:57.721127 main Log opened 2020-09-19T23:36:57.721111000Z 23:36:57.753045 main OS Product: Linux 23:36:57.753150 main OS Release: 5.4.66 23:36:57.753187 main OS Version: #1-NixOS SMP Thu Sep 17 11:47:56 UTC 2020 23:36:57.753246 main Executable: /nix/store/m7jdv9mzg0czfz3l6b6zcy76z80wl0p4-VirtualBox-GuestAdditions-6.1.6-5.4.66/bin/VBoxService 23:36:57.753247 main Process ID: 19721 23:36:57.753248 main Package type: LINUX_64BITS_GENERIC 23:36:57.754037 main Guest Property: /VirtualBox/GuestAdd/VBoxService/--timesync-interval not found 23:36:57.755296 main Guest Property: /VirtualBox/GuestAdd/VBoxService/--timesync-min-adjust not found 23:36:57.757081 main Guest Property: /VirtualBox/GuestAdd/VBoxService/--timesync-latency-factor not found 23:36:57.759389 main Guest Property: /VirtualBox/GuestAdd/VBoxService/--timesync-max-latency not found 23:36:57.760613 main Guest Property: /VirtualBox/GuestAdd/VBoxService/--timesync-set-threshold not found 23:36:57.762017 main Guest Property: /VirtualBox/GuestAdd/VBoxService/--timesync-set-start not found 23:36:57.762802 main Guest Property: /VirtualBox/GuestAdd/VBoxService/--timesync-no-set-start not found 23:36:57.764212 main Guest Property: /VirtualBox/GuestAdd/VBoxService/--timesync-set-on-restore not found 23:36:57.765754 main Guest Property: /VirtualBox/GuestAdd/VBoxService/--timesync-no-set-on-restore not found 23:36:57.767093 main Guest Property: /VirtualBox/GuestAdd/VBoxService/--timesync-verbosity not found 23:36:57.767759 main 6.1.6 r137129 started. Verbose level = 4 23:36:57.769269 main Setting VBoxService status to 30 23:36:57.785986 main Initializing services ... 23:36:57.812554 main vbglR3GuestCtrlDetectPeekGetCancelSupport: Supported (#1) 23:36:57.812996 main Guest control service client ID=25 w/ optimizations 23:36:57.814539 main Host features: 0x3 23:36:57.816135 main Property Service Client ID: 0x1a 23:36:57.818363 main Guest Property: /VirtualBox/GuestAdd/VBoxService/--vminfo-user-idle-threshold not found 23:36:57.819907 main vgsvcBalloonInit 23:36:57.821279 main MemBalloon: New balloon size 0 MB (R0 memory) 23:36:57.822376 main vgsvcVMStatsInit 23:36:57.823971 main vgsvcVMStatsInit: New statistics interval 0 seconds 23:36:57.825671 main vbsvcAutomounterInit 23:36:57.827241 main vbsvcAutomounterInit: Service Client ID: 0x1b 23:36:57.842866 main Starting services ... 23:36:57.843246 main Starting service 'control' ... [New Thread 0x7fffe9c5a700 (LWP 19727)] [New Thread 0x7fffe9bd9700 (LWP 19728)] 23:36:57.847465 control GstCtrl: Waiting for host msg ... 23:36:57.849543 main Starting service 'timesync' ... [New Thread 0x7fffe9b58700 (LWP 19729)] 23:36:57.853321 main Starting service 'vminfo' ... 23:36:57.853813 timesync vgsvcTimeSyncWorker: Host: 2020-09-19T23:36:57.859000000Z (MinAdjust: 100 ms), Guest: 2020-09-19T23:36:57.853394000Z => 5 606 000 ns drift [New Thread 0x7fffe9ad7700 (LWP 19730)] 23:36:57.856894 main Starting service 'cpuhotplug' ... [New Thread 0x7fffe9a56700 (LWP 19731)] 23:36:57.859560 vminfo Writing guest property '/VirtualBox/GuestInfo/OS/Product' = 'Linux' 23:36:57.862285 main Starting service 'memballoon' ... 23:36:57.863818 vminfo Writing guest property '/VirtualBox/GuestInfo/OS/Release' = '5.4.66' [New Thread 0x7fffe99d5700 (LWP 19732)] 23:36:57.865417 vminfo Writing guest property '/VirtualBox/GuestInfo/OS/Version' = '#1-NixOS SMP Thu Sep 17 11:47:56 UTC 2020' 23:36:57.865591 vminfo Writing guest property '/VirtualBox/GuestInfo/OS/ServicePack' = '' 23:36:57.865858 vminfo Writing guest property '/VirtualBox/GuestAdd/Version' = '6.1.6' 23:36:57.865934 main Starting service 'vmstats' ... 23:36:57.866023 vminfo Writing guest property '/VirtualBox/GuestAdd/VersionExt' = '6.1.6' [New Thread 0x7fffe9954700 (LWP 19733)] 23:36:57.866911 vminfo Writing guest property '/VirtualBox/GuestAdd/Revision' = '137129' 23:36:57.867451 vminfo Found entry 'reboot' (type: 2, PID: 0, session: 0) 23:36:57.867573 vminfo Found entry 'danieljour' (type: 7, PID: 728, session: 0) 23:36:57.867616 vminfo Adding user 'danieljour' (type: 7) to list 23:36:57.867667 vminfo Found entry 'danieljour' (type: 7, PID: 947, session: 0) 23:36:57.868003 main Starting service 'automount' ... [New Thread 0x7fffe98d3700 (LWP 19734)] 23:36:57.873438 main All services started. 23:36:57.873757 main Setting VBoxService status to 50 23:36:57.877053 automount vbsvcAutomounterRefreshTable: 0 entries in mount table after pass #1. 23:36:57.877954 automount vbsvcAutomounterWorker: Waiting with uConfigVer=0 23:36:57.880908 automount vbsvcAutomounterWorker: Woke up with uNewVersion=0 and rc=VERR_CANCELLED 23:36:57.948426 vminfo Checking ConsoleKit sessions ... 23:36:57.950917 vminfo cUsersInList=1, pszUserList=danieljour, rc=VINF_SUCCESS 23:36:57.951405 vminfo [PropCache 0000000000692340]: Written '/VirtualBox/GuestInfo/OS/LoggedInUsersList'='danieljour' (flags: a), rc=VINF_SUCCESS 23:36:57.951545 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/OS/LoggedInUsersList' resulted in rc=VINF_SUCCESS 23:36:57.951712 vminfo [PropCache 0000000000692340]: Written '/VirtualBox/GuestInfo/OS/LoggedInUsers'='1' (flags: a), rc=VINF_SUCCESS 23:36:57.951777 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/OS/LoggedInUsers' resulted in rc=VINF_SUCCESS 23:36:57.953751 vminfo [PropCache 0000000000692340]: Written '/VirtualBox/GuestInfo/OS/NoLoggedInUsers'='false' (flags: a), rc=VINF_SUCCESS 23:36:57.954069 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/OS/NoLoggedInUsers' resulted in rc=VINF_SUCCESS 23:36:57.954880 vminfo Writing users returned with rc=VINF_SUCCESS 23:36:57.957360 vminfo [PropCache 0000000000692340]: Written '/VirtualBox/GuestInfo/Net/0/V4/IP'='10.0.2.15' (flags: 0), rc=VINF_SUCCESS 23:36:57.957848 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/Net/0/V4/IP' resulted in rc=VINF_SUCCESS 23:36:57.959430 vminfo [PropCache 0000000000692340]: Written '/VirtualBox/GuestInfo/Net/0/V4/Broadcast'='10.0.2.255' (flags: 0), rc=VINF_SUCCESS 23:36:57.960786 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/Net/0/V4/Broadcast' resulted in rc=VINF_SUCCESS 23:36:57.961677 vminfo [PropCache 0000000000692340]: Written '/VirtualBox/GuestInfo/Net/0/V4/Netmask'='255.255.255.0' (flags: 0), rc=VINF_SUCCESS 23:36:57.961792 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/Net/0/V4/Netmask' resulted in rc=VINF_SUCCESS 23:36:57.963149 vminfo [PropCache 0000000000692340]: Written '/VirtualBox/GuestInfo/Net/0/MAC'='0800272F54B7' (flags: 0), rc=VINF_SUCCESS 23:36:57.965817 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/Net/0/MAC' resulted in rc=VINF_SUCCESS 23:36:57.969406 vminfo [PropCache 0000000000692340]: Written '/VirtualBox/GuestInfo/Net/0/Status'='Up' (flags: 0), rc=VINF_SUCCESS 23:36:57.969887 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/Net/0/Status' resulted in rc=VINF_SUCCESS 23:36:57.971318 vminfo [PropCache 0000000000692340]: Written '/VirtualBox/GuestInfo/Net/0/Name'='enp0s3' (flags: 0), rc=VINF_SUCCESS 23:36:57.973628 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/Net/0/Name' resulted in rc=VINF_SUCCESS 23:36:57.975789 vminfo [PropCache 0000000000692340]: Written '/VirtualBox/GuestInfo/Net/Count'='1' (flags: 6), rc=VINF_SUCCESS 23:36:57.977170 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/Net/Count' resulted in rc=VINF_SUCCESS 23:36:57.977976 vminfo Guest Property: /VirtualBox/HostInfo/VRDP/ActiveClient not found 23:36:57.978041 vminfo VRDP: Handling location awareness done 23:36:59.007040 automount vbsvcAutomounterWorker: Waiting with uConfigVer=0 23:37:03.058141 vminfo Found entry 'reboot' (type: 2, PID: 0, session: 0) 23:37:03.058253 vminfo Found entry 'danieljour' (type: 7, PID: 728, session: 0) 23:37:03.058292 vminfo Adding user 'danieljour' (type: 7) to list 23:37:03.058352 vminfo Found entry 'danieljour' (type: 7, PID: 947, session: 0) 23:37:03.058396 vminfo Checking ConsoleKit sessions ... 23:37:03.059076 vminfo cUsersInList=1, pszUserList=danieljour, rc=VINF_SUCCESS 23:37:03.059696 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/OS/LoggedInUsersList' resulted in rc=VINF_NO_CHANGE 23:37:03.059771 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/OS/LoggedInUsers' resulted in rc=VINF_NO_CHANGE 23:37:03.059812 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/OS/NoLoggedInUsers' resulted in rc=VINF_NO_CHANGE 23:37:03.059853 vminfo Writing users returned with rc=VINF_NO_CHANGE 23:37:03.059911 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/Net/0/V4/IP' resulted in rc=VINF_NO_CHANGE 23:37:03.059962 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/Net/0/V4/Broadcast' resulted in rc=VINF_NO_CHANGE 23:37:03.060000 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/Net/0/V4/Netmask' resulted in rc=VINF_NO_CHANGE 23:37:03.060043 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/Net/0/MAC' resulted in rc=VINF_NO_CHANGE 23:37:03.060679 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/Net/0/Status' resulted in rc=VINF_NO_CHANGE 23:37:03.060765 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/Net/0/Name' resulted in rc=VINF_NO_CHANGE 23:37:03.060973 vminfo [PropCache 0000000000692340]: Written '/VirtualBox/GuestInfo/Net/Count'='1' (flags: 6), rc=VINF_SUCCESS 23:37:03.061045 vminfo [PropCache 0000000000692340]: Updating '/VirtualBox/GuestInfo/Net/Count' resulted in rc=VINF_SUCCESS 23:37:03.061702 vminfo Guest Property: /VirtualBox/HostInfo/VRDP/ActiveClient not found 23:37:03.061795 vminfo VRDP: Handling location awareness done 23:37:05.685843 cpuhotplug CpuHotPlug: Event happened idCpuCore=2 idCpuPackage=0 enmEventType=3 23:37:05.686102 cpuhotplug Final path after probing /sys/devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0004:01/LNXCPU:01 rc=VINF_SUCCESS 23:37:05.686215 cpuhotplug Going deeper (iLvlCurr=1) 23:37:05.686257 cpuhotplug New path /sys/devices/LNXSYSTM:00/LNXSYBUS:* 23:37:05.686311 cpuhotplug Going deeper (iLvlCurr=2) 23:37:05.686345 cpuhotplug New path /sys/devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0004:* 23:37:05.686396 cpuhotplug Going deeper (iLvlCurr=3) 23:37:05.686428 cpuhotplug New path /sys/devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0004:01/LNXCPU:* 23:37:05.686536 cpuhotplug CPU doesn't match, next directory 23:37:05.686577 cpuhotplug Directory not found, going back (iLvlCurr=2) 23:37:05.686616 cpuhotplug Going deeper (iLvlCurr=3) 23:37:05.686641 cpuhotplug New path /sys/devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0004:02/LNXCPU:* 23:37:05.686698 cpuhotplug CPU doesn't match, next directory 23:37:05.686729 cpuhotplug Directory not found, going back (iLvlCurr=2) 23:37:05.686756 cpuhotplug Going deeper (iLvlCurr=3) 23:37:05.686797 cpuhotplug New path /sys/devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0004:00/LNXCPU:* 23:37:05.686866 cpuhotplug CPU doesn't match, next directory 23:37:05.686898 cpuhotplug Directory not found, going back (iLvlCurr=2) 23:37:05.686927 cpuhotplug Directory not found, going back (iLvlCurr=1) 23:37:05.686954 cpuhotplug Going deeper (iLvlCurr=2) 23:37:05.686978 cpuhotplug New path /sys/devices/LNXSYSTM:00/LNXSYBUS:01/ACPI0004:* 23:37:05.687019 cpuhotplug Directory not found, going back (iLvlCurr=1) 23:37:05.687058 cpuhotplug Directory not found, going back (iLvlCurr=0) 23:37:05.687114 cpuhotplug Directory not found, going back (iLvlCurr=4294967295) Thread 8 "cpuhotplug" received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x7fffe9a56700 (LWP 19731)] 0x0000000000414756 in ?? () (gdb) bt #0 0x0000000000414756 in ?? () #1 0x0000000000404ddf in ?? () #2 0x00000000004382fc in ?? () #3 0x0000000000417e7b in ?? () #4 0x00007ffff7fafedd in start_thread () from /nix/store/xg6ilb9g9zhi2zg1dpi4zcp288rhnvns-glibc-2.30/lib/libpthread.so.0 #5 0x00007ffff7ed6aaf in clone () from /nix/store/xg6ilb9g9zhi2zg1dpi4zcp288rhnvns-glibc-2.30/lib/libc.so.6 (gdb)
Change History (6)
comment:1 by , 4 years ago
comment:2 by , 4 years ago
(Side note, found reason for the CPU not being online: https://www.virtualbox.org/ticket/19903)
comment:3 by , 4 years ago
| Summary: | Crash due to invalid assumption (unsigned wrap around) in vgsvcCpuHotPlugGetACPIDevicePath (VBoxService) → Crash due to invalid assumption (unsigned wrap around) in vgsvcCpuHotPlugGetACPIDevicePath (VBoxService) => fixed in SVN/next maintenance |
|---|
Thanks for the report, should be fixed in the next maintenance release. There is a new testbuild available on Testbuilds, >= r140448. You only need to update the guest additions if you want to try it out.
comment:4 by , 4 years ago
@aeichner Thank you, yes indeed, the test builds work fine! When is it planned that this feature will hit a "stable" version (6.1.16 probably?)? (I'm packaging this, and since your testbuild isos for a specific revision don't stay online for long this is difficult)
comment:5 by , 4 years ago
We usually don't give any release dates but the next Oracle CPU (Critical Patch Update) is on the 20th of October 2020, so you can likely expect a release on this date at latest. ;)
Note:
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for help on using tickets.
Ok, found out more for *why* the ACPI path cannot be found:
cat /sys/devices/system/cpu/cpu2/onlinereturns 0)/sys/devices/LNXSYSTM\:00/LNXSYBUS\:00/ACPI0004\:02/LNXCPU\:02/physical_node/contains notopologydirectory; and the above mentioned function fails to find the ACPI path (and crashes due to the bug)If I make sure that the CPU is online prior to unplugging, then everything works as expected. This should be fixed, though, because VBoxService might not be the only thing turning CPUs on and off on a system (and apparently, for some other unrelated issue, it is not turning them on on mine).