>Synopsis: on heavy load and with lot of disk i/o kernel panics
>Category: kernel
>Environment:
System : OpenBSD 6.0
Details : OpenBSD 6.0-stable (GENERIC) #1: Fri Aug 5 18:52:56 CEST
2016
[email protected]:/usr/src/sys/arch/amd64/compile/GENERIC
Architecture: OpenBSD.amd64
Machine : amd64
>Description:
On heavy load and with lot of disk i/o kernel panics, atm I have
ddb.panic=0
on this machine, I will provide more infos next time it will occur.
---------------------------------------------------
uvm_fault(0xffffffff81938e00, 0x7f8bd5773358, 0, 2) -> e
fatal page fault in supervisor mode
trap type 6 code 2 rip ffffffff813231fa cs 8 rflags 10202 cr2 7f8bd5773358 cpl
a rsp ffff800022143d10
panic: trap type 6, code=2, pc=ffffffff813231fa
Starting stack trace...
panic() at panic+0x10b
trap() at trap+0x6d2
--- trap (number 6) ---
pmap_page_remove() at pmap_page_remove+0x11a
uvm_anfree() at uvm_anfree+0x38
amap_wipeout() at amap_wipeout+0xe1
uvm_unmap_detach() at uvm_unmap_detach+0x52
uvm_map_teardown() at uvm_map_teardown+0x141
uvmspace_free() at uvmspace_free+0x36
uvm_exit() at uvm_exit+0x15
reaper() at reaper+0xa5
end trace frame: 0x0, count: 247
End of stack trace.
syncing disks... panic: assertwaitok: non-zero mutex count: 1
Starting stack trace...
panic() at panic+0x10b
assertwaitok() at assertwaitok+0x3a
bufq_wait() at bufq_wait+0x2d
bwrite() at bwrite+0xf5
VOP_BWRITE() at VOP_BWRITE+0x38
ffs_fsync() at ffs_fsync+0x13f
VOP_FSYNC() at VOP_FSYNC+0x3c
ffs_sync_vnode() at ffs_sync_vnode+0x6a
vfs_mount_foreach_vnode() at vfs_mount_foreach_vnode+0x35
ffs_sync() at ffs_sync+0x89
sys_sync() at sys_sync+0x87
vfs_syncwait() at vfs_syncwait+0x3b
vfs_shutdown() at vfs_shutdown+0x36
boot() at boot+0x138
reboot() at reboot+0x1d
panic() at panic+0x106
trap() at trap+0x6d2
--- trap (number 6) ---
pmap_page_remove() at pmap_page_remove+0x11a
uvm_anfree() at uvm_anfree+0x38
amap_wipeout() at amap_wipeout+0xe1
uvm_unmap_detach() at uvm_unmap_detach+0x52
uvm_map_teardown() at uvm_map_teardown+0x141
uvmspace_free() at uvmspace_free+0x36
uvm_exit() at uvm_exit+0x15
reaper() at reaper+0xa5
end trace frame: 0x0, count: 232
End of stack trace.
dump to dev 4,1 not possible
rebooting...
---------------------------------------------------
>How-To-Repeat:
do not know, it happens every now and then, seems related with disk i/o
or swap i/o
>Fix:
unknown
dmesg:
OpenBSD 6.0-stable (GENERIC) #1: Fri Aug 5 18:52:56 CEST 2016
[email protected]:/usr/src/sys/arch/amd64/compile/GENERIC
real mem = 8573026304 (8175MB)
avail mem = 8308785152 (7923MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xf0cc0 (10 entries)
bios0: vendor SeaBIOS version
"rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org" date 04/01/2014
bios0: QEMU Standard PC (i440FX + PIIX, 1996)
acpi0 at bios0: rev 0
acpi0: sleep states S3 S4 S5
acpi0: tables DSDT FACP SSDT APIC HPET
acpi0: wakeup devices
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Common KVM processor, 3700.53 MHz
cpu0:
FPU,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,SSE3,CX16,x2APIC,HV,NXE,LONG,LAHF
cpu0: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB 64b/line
16-way L2 cache
cpu0: ITLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped
cpu0: DTLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
cpu0: apic clock running at 1000MHz
ioapic0 at mainbus0: apid 0 pa 0xfec00000, version 11, 24 pins
acpihpet0 at acpi0: 100000000 Hz
acpiprt0 at acpi0: bus 0 (PCI0)
acpicpu0 at acpi0: C1(@1 halt!)
"ACPI0006" at acpi0 not configured
"PNP0303" at acpi0 not configured
"PNP0F13" at acpi0 not configured
"PNP0700" at acpi0 not configured
"PNP0A06" at acpi0 not configured
"ACPI0007" at acpi0 not configured
pvbus0 at mainbus0: KVM
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel 82441FX" rev 0x02
pcib0 at pci0 dev 1 function 0 "Intel 82371SB ISA" rev 0x00
pciide0 at pci0 dev 1 function 1 "Intel 82371SB IDE" rev 0x00: DMA, channel 0
wired to compatibility, channel 1 wired to compatibility
pciide0: channel 0 disabled (no drives)
pciide0: channel 1 disabled (no drives)
uhci0 at pci0 dev 1 function 2 "Intel 82371SB USB" rev 0x01: apic 0 int 11
piixpm0 at pci0 dev 1 function 3 "Intel 82371AB Power" rev 0x03: apic 0 int 9
iic0 at piixpm0
vga1 at pci0 dev 2 function 0 "Cirrus Logic CL-GD5446" rev 0x00
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
virtio0 at pci0 dev 3 function 0 "Qumranet Virtio Memory" rev 0x00
viomb0 at virtio0
virtio0: apic 0 int 11
virtio1 at pci0 dev 10 function 0 "Qumranet Virtio Storage" rev 0x00
vioblk0 at virtio1
scsibus1 at vioblk0: 2 targets
sd0 at scsibus1 targ 0 lun 0: <VirtIO, Block Device, > SCSI3 0/direct fixed
sd0: 40964MB, 512 bytes/sector, 83894272 sectors
virtio1: msix shared
virtio2 at pci0 dev 19 function 0 "Qumranet Virtio Network" rev 0x00
vio0 at virtio2: address 02:00:00:bd:e4:b5
virtio2: msix shared
isa0 at pcib0
isadma0 at isa0
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
fd0 at fdc0 drive 1: density unknown
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
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
usb0 at uhci0: USB revision 1.0
uhub0 at usb0 "Intel UHCI root hub" rev 1.00/1.00 addr 1
nvram: invalid checksum
uhidev0 at uhub0 port 1 configuration 1 interface 0 "QEMU QEMU USB Tablet" rev
2.00/0.00 addr 2
uhidev0: iclass 3/0
ums0 at uhidev0: 3 buttons, Z dir
wsmouse1 at ums0 mux 0
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
root on sd0a (39122aedf2ef37f7.a) swap on sd0b dump on sd0b
WARNING: / was not properly unmounted
clock: unknown CMOS layout
usbdevs:
Controller /dev/usb0:
addr 1: full speed, self powered, config 1, UHCI root hub(0x0000),
Intel(0x8086), rev 1.00
port 1 addr 2: full speed, power 100 mA, config 1, QEMU USB Tablet(0x0001),
QEMU(0x0627), rev 0.00, iSerialNumber 42
port 2 powered
