Xenocara crash with emacs, acme, and window resizing

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Xenocara crash with emacs, acme, and window resizing

Daniel Moerner-2
>Synopsis: Xenocara crashes when resizing editor window if editing same file
>Category: user
>Environment:
        System      : OpenBSD 6.5
        Details     : OpenBSD 6.5 (GENERIC.MP) #1: Mon May 27 18:27:59 CEST 2019
                         [hidden email]:/usr/src/sys/arch/amd64/compile/GENERIC.MP

        Architecture: OpenBSD.amd64
        Machine     : amd64
>Description:

When I use emacs and acme (from plan9port) to edit the same text file,
I can reproducibly crash Xenocara and return myself to a xenodm login
screen by aggressively resizing the acme window. I tested this with
both fvwm and cwm. See more details in the How-To-Repeat section
below.

(Sorry, I'm not sure exactly what category this falls under.)

>How-To-Repeat:

Install editors/emacs and plan9/plan9port. Run emacs and 9 acme. Have
both open the same text file. Position the acme window around the
emacs window and start to resize it.

After a few movements of the mouse, it appears that Xenocara
crashes. I get returned to a xenodm login prompt. I reproduced this
with both cwm and fvwm, and I was able to get the crash 100% of the
time, although sometimes you need to move your mouse around a bit
while resizing the window. The one thing that's not clearly
reproducible about this bug is that sometimes I can then log in again
with xenodm, sometimes it appears that I can't type anything---but I
can switch to a virtual console and login and reboot.

I get the following message in /var/log/Xorg.0.log:

[192422.775] (EE) Segmentation fault at address 0x2b8aabac000
[192422.775] (EE)
Fatal server error:
[192422.775] (EE) Caught signal 11 (Segmentation fault). Server aborting
[192422.775] (EE)
[192422.775] (EE)
Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.
[192422.775] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[192422.775] (EE)
[192422.775] (EE) ws: /dev/wsmouse0: unknown command 4
[192422.776] (EE) ws: /dev/wsmouse: unknown command 4
[192422.776] (II) AIGLX: Suspending AIGLX clients for VT switch
[192423.090] (EE) Server terminated with error (1). Closing log file.


>Fix:

No known fix. In cases where I can log back in at the xenodm prompt,
the system appears to be functioning properly. In cases where I have
not been able to log back in after the crash, I switch to a virtual
console and reboot.

I'm happy to try to provide any other information.

Best,
Daniel


dmesg:
OpenBSD 6.5 (GENERIC.MP) #1: Mon May 27 18:27:59 CEST 2019
    [hidden email]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 8446976000 (8055MB)
avail mem = 8181358592 (7802MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.7 @ 0xccbfd000 (65 entries)
bios0: vendor LENOVO version "N14ET50W (1.28 )" date 03/21/2019
bios0: LENOVO 20BSCTO1WW
acpi0 at bios0: rev 2
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP ASF! HPET ECDT APIC MCFG SSDT SSDT SSDT SSDT SSDT SSDT SSDT SSDT SSDT SSDT PCCT SSDT UEFI MSDM BATB FPDT UEFI BGRT DMAR
acpi0: wakeup devices LID_(S4) SLPB(S3) IGBE(S4) EXP2(S4) XHCI(S3) EHC1(S3)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpihpet0 at acpi0: 14318179 Hz
acpiec0 at acpi0
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 798.29 MHz, 06-3d-04
cpu0: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu0: 256KB 64b/line 8-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
cpu0: apic clock running at 99MHz
cpu0: mwait min=64, max=64, C-substates=0.2.1.2.4.1.1.1, IBE
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 798.16 MHz, 06-3d-04
cpu1: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu1: 256KB 64b/line 8-way L2 cache
cpu1: smt 1, core 0, package 0
cpu2 at mainbus0: apid 2 (application processor)
cpu2: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 798.16 MHz, 06-3d-04
cpu2: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu2: 256KB 64b/line 8-way L2 cache
cpu2: smt 0, core 1, package 0
cpu3 at mainbus0: apid 3 (application processor)
cpu3: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 798.16 MHz, 06-3d-04
cpu3: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu3: 256KB 64b/line 8-way L2 cache
cpu3: smt 1, core 1, package 0
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 40 pins
acpimcfg0 at acpi0
acpimcfg0: addr 0xf8000000, bus 0-63
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus -1 (PEG_)
acpiprt2 at acpi0: bus 3 (EXP1)
acpiprt3 at acpi0: bus 4 (EXP2)
acpiprt4 at acpi0: bus -1 (EXP3)
acpiprt5 at acpi0: bus -1 (EXP6)
acpicpu0 at acpi0: C3(200@233 mwait.1@0x40), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS
acpicpu1 at acpi0: C3(200@233 mwait.1@0x40), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS
acpicpu2 at acpi0: C3(200@233 mwait.1@0x40), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS
acpicpu3 at acpi0: C3(200@233 mwait.1@0x40), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS
acpipwrres0 at acpi0: PUBS, resource for XHCI, EHC1
acpipwrres1 at acpi0: NVP3, resource for PEG_
acpipwrres2 at acpi0: NVP2, resource for PEG_
acpitz0 at acpi0: critical temperature is 128 degC
acpibtn0 at acpi0: LID_
acpibtn1 at acpi0: SLPB
acpipci0 at acpi0 PCI0: 0x00000000 0x00000011 0x00000001
acpicmos0 at acpi0
acpibat0 at acpi0: BAT0 model "00HW003" serial   315 type LiP oem "SMP"
acpiac0 at acpi0: AC unit offline
acpithinkpad0 at acpi0
"PNP0C14" at acpi0 not configured
"PNP0C14" at acpi0 not configured
"PNP0C14" at acpi0 not configured
"INT340F" at acpi0 not configured
acpivideo0 at acpi0: VID_
acpivout at acpivideo0 not configured
acpivideo1 at acpi0: VID_
cpu0: using VERW MDS workaround
cpu0: Enhanced SpeedStep 798 MHz: speeds: 2201, 2200, 2100, 2000, 1800, 1700, 1600, 1500, 1300, 1200, 1100, 1000, 900, 700, 600, 500 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel Core 5G Host" rev 0x09
inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics 5500" rev 0x09
drm0 at inteldrm0
inteldrm0: msi
inteldrm0: 1920x1080, 32bpp
wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation)
wsdisplay0: screen 1-5 added (std, vt100 emulation)
azalia0 at pci0 dev 3 function 0 "Intel Core 5G HD Audio" rev 0x09: msi
xhci0 at pci0 dev 20 function 0 "Intel 9 Series xHCI" rev 0x03: msi, xHCI 1.0
usb0 at xhci0: USB revision 3.0
uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 addr 1
"Intel 9 Series MEI" rev 0x03 at pci0 dev 22 function 0 not configured
em0 at pci0 dev 25 function 0 "Intel I218-V" rev 0x03: msi, address 54:ee:75:54:d3:16
azalia1 at pci0 dev 27 function 0 "Intel 9 Series HD Audio" rev 0x03: msi
azalia1: codecs: Realtek ALC292
audio0 at azalia1
ppb0 at pci0 dev 28 function 0 "Intel 9 Series PCIE" rev 0xe3: msi
pci1 at ppb0 bus 3
ppb1 at pci0 dev 28 function 1 "Intel 9 Series PCIE" rev 0xe3: msi
pci2 at ppb1 bus 4
iwm0 at pci2 dev 0 function 0 "Intel Dual Band Wireless AC 7265" rev 0x59, msi
ehci0 at pci0 dev 29 function 0 "Intel 9 Series USB" rev 0x03: apic 2 int 23
usb1 at ehci0: USB revision 2.0
uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
pcib0 at pci0 dev 31 function 0 "Intel 9 Series LPC" rev 0x03
ahci0 at pci0 dev 31 function 2 "Intel 9 Series AHCI" rev 0x03: msi, AHCI 1.3
ahci0: port 3: 6.0Gb/s
scsibus1 at ahci0: 32 targets
sd0 at scsibus1 targ 3 lun 0: <ATA, TOSHIBA THNSFJ25, JULA> SCSI3 0/direct fixed naa.500080d9103acb80
sd0: 244198MB, 512 bytes/sector, 500118192 sectors, thin
ichiic0 at pci0 dev 31 function 3 "Intel 9 Series SMBus" rev 0x03: apic 2 int 18
iic0 at ichiic0
pchtemp0 at pci0 dev 31 function 6 "Intel 9 Series Thermal" rev 0x03
isa0 at pcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pms0 at pckbc0 (aux slot)
wsmouse0 at pms0 mux 0
wsmouse1 at pms0 mux 0
pms0: Synaptics clickpad, firmware 8.1, 0x1e2b1 0x943300
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
vmm0 at mainbus0: VMX/EPT
efifb at mainbus0 not configured
uhub2 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.03 addr 2
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
sd1 at scsibus3 targ 1 lun 0: <OPENBSD, SR CRYPTO, 006> SCSI2 0/direct fixed
sd1: 244197MB, 512 bytes/sector, 500116577 sectors
root on sd1a (0a93bdc49ee068f4.a) swap on sd1b dump on sd1b
iwm0: hw rev 0x210, fw ver 16.242414.0, address 5c:e0:c5:39:da:eb

usbdevs:
Controller /dev/usb0:
addr 01: 8086:0000 Intel, xHCI root hub
         super speed, self powered, config 1, rev 1.00
         driver: uhub0
Controller /dev/usb1:
addr 01: 8086:0000 Intel, EHCI root hub
         high speed, self powered, config 1, rev 1.00
         driver: uhub1
addr 02: 8087:8001 Intel, Rate Matching Hub
         high speed, self powered, config 1, rev 0.03
         driver: uhub2

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Re: Xenocara crash with emacs, acme, and window resizing

Jeremy O'Brien
On Sat, Jun 1, 2019, at 17:39, Daniel Moerner wrote:

> >Synopsis: Xenocara crashes when resizing editor window if editing same file
> >Category: user
> >Environment:
> System      : OpenBSD 6.5
> Details     : OpenBSD 6.5 (GENERIC.MP) #1: Mon May 27 18:27:59 CEST
> 2019
>
> [hidden email]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
>
> Architecture: OpenBSD.amd64
> Machine     : amd64
> >Description:
>
> When I use emacs and acme (from plan9port) to edit the same text file,
> I can reproducibly crash Xenocara and return myself to a xenodm login
> screen by aggressively resizing the acme window. I tested this with
> both fvwm and cwm. See more details ihttps://github.com/openbsd/xenocara/commit/4fd0ec7f37876473a4f16a0e4a6dc6c55974d317n the How-To-Repeat section
> below.
>
> (Sorry, I'm not sure exactly what category this falls under.)
>
> >How-To-Repeat:
>
> Install editors/emacs and plan9/plan9port. Run emacs and 9 acme. Have
> both open the same text file. Position the acme window around the
> emacs window and start to resize it.
>
> After a few movements of the mouse, it appears that Xenocara
> crashes. I get returned to a xenodm login prompt. I reproduced this
> with both cwm and fvwm, and I was able to get the crash 100% of the
> time, although sometimes you need to move your mouse around a bit
> while resizing the window. The one thing that's not clearly
> reproducible about this bug is that sometimes I can then log in again
> with xenodm, sometimes it appears that I can't type anything---but I
> can switch to a virtual console and login and reboot.
>
> I get the following message in /var/log/Xorg.0.log:
>

<snip crash/dmesg>

I had this exact same crash with acme, which ended up being solved by the following commit (which is also in -current): https://github.com/openbsd/xenocara/commit/4fd0ec7f37876473a4f16a0e4a6dc6c55974d317

I know the fix says it's only for multi-GPU systems, but I managed to grab a stacktrace from my (single-GPU) system which showed the same stacktrace pattern. Haven't had any crashes since applying that patch.

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Re: Xenocara crash with emacs, acme, and window resizing

Daniel Moerner
On Sun, Jun 2, 2019 at 2:03 PM Jeremy O'Brien <[hidden email]> wrote:
> I had this exact same crash with acme, which ended up being solved by the following commit (which is also in -current): https://github.com/openbsd/xenocara/commit/4fd0ec7f37876473a4f16a0e4a6dc6c55974d317
>
> I know the fix says it's only for multi-GPU systems, but I managed to grab a stacktrace from my (single-GPU) system which showed the same stacktrace pattern. Haven't had any crashes since applying that patch.

Thanks for sharing. I don't have a -current machine with Xenocara to
confirm this, but that's great to hear. (Fortunately the bug doesn't
affect my day-to-day use on -stable.)

Best,
Daniel