https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194569
Bug ID: 194569
Summary: kernel panics while loading vmm(4)
Product: Base System
Version: 11.0-CURRENT
Hardware: amd64
OS: Any
Status: Needs Triage
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 148601
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=148601&action=edit
vmm.c.patch
When loading vmm(4), following stack trace is shown and kernel panics.
(kgdb) #0 doadump (textdump=0) at pcpu.h:219
#1 0xffffffff80332b8e in db_dump (dummy=<value optimized out>, dummy2=0,
dummy3=0, dummy4=0x0) at /data/rhea/usr/src/sys/ddb/db_command.c:533
#2 0xffffffff8033266d in db_command (cmd_table=0x0)
at /data/rhea/usr/src/sys/ddb/db_command.c:440
#3 0xffffffff803323e4 in db_command_loop ()
at /data/rhea/usr/src/sys/ddb/db_command.c:493
#4 0xffffffff80334e60 in db_trap (type=<value optimized out>, code=0)
at /data/rhea/usr/src/sys/ddb/db_main.c:251
#5 0xffffffff806c9111 in kdb_trap (type=12, code=0, tf=<value optimized out>)
at /data/rhea/usr/src/sys/kern/subr_kdb.c:654
#6 0xffffffff808fd45c in trap_fatal (frame=0xfffffe046bcc2400,
eva=<value optimized out>)
at /data/rhea/usr/src/sys/amd64/amd64/trap.c:861
#7 0xffffffff808fd6f6 in trap_pfault (frame=0xfffffe046bcc2400,
usermode=<value optimized out>)
at /data/rhea/usr/src/sys/amd64/amd64/trap.c:677
#8 0xffffffff808fce0e in trap (frame=0xfffffe046bcc2400)
at /data/rhea/usr/src/sys/amd64/amd64/trap.c:426
#9 0xffffffff808e20b2 in calltrap ()
at /data/rhea/usr/src/sys/amd64/amd64/exception.S:231
#10 0xffffffff807405fb in strlen (str=0x0)
at /data/rhea/usr/src/sys/libkern/strlen.c:98
#11 0xffffffff8064e8de in freeenv (env=0x0)
at /data/rhea/usr/src/sys/kern/kern_environment.c:266
#12 0xffffffff816059a8 in vmm_is_pptdev (bus=0, slot=0, func=0)
at /data/rhea/usr/src/sys/modules/vmm/../../amd64/vmm/vmm.c:1969
#13 0xffffffff8160ca27 in ppt_probe (dev=0xfffff8000765bd00)
at /data/rhea/usr/src/sys/modules/vmm/../../amd64/vmm/io/ppt.c:128
#14 0xffffffff806be860 in device_probe_child (dev=0xfffff8000765c000,
child=0xfffff8000765bd00) at device_if.h:108
#15 0xffffffff806bf4c0 in device_probe (dev=0xfffff8000765bd00)
at /data/rhea/usr/src/sys/kern/subr_bus.c:2763
#16 0xffffffff806bf5ae in device_probe_and_attach (dev=0xfffff8000765bd00)
at /data/rhea/usr/src/sys/kern/subr_bus.c:2787
#17 0xffffffff804c8a6a in pci_driver_added (dev=0xfffff8000765c000,
driver=<value optimized out>) at /data/rhea/usr/src/sys/dev/pci/pci.c:3784
#18 0xffffffff806bdb5a in devclass_driver_added (dc=0xfffff800074aaf00,
driver=0xffffffff816298e0) at bus_if.h:204
#19 0xffffffff806bdabc in devclass_add_driver (dc=0xfffff800074aaf00,
driver=0xffffffff816298e0, pass=<value optimized out>,
dcp=<value optimized out>) at /data/rhea/usr/src/sys/kern/subr_bus.c:1138
#20 0xffffffff80676490 in module_register_init (arg=0xffffffff81629958)
at /data/rhea/usr/src/sys/kern/kern_module.c:123
#21 0xffffffff8066b238 in linker_load_module (kldname=<value optimized out>,
modname=0xfffff8000bf6e000 "vmm", parent=0x0, verinfo=0x0,
lfpp=0xfffffe046bcc2a68) at /data/rhea/usr/src/sys/kern/kern_linker.c:224
#22 0xffffffff8066c617 in kern_kldload (td=<value optimized out>,
file=<value optimized out>, fileid=0xfffffe046bcc2aa4)
at /data/rhea/usr/src/sys/kern/kern_linker.c:1031
#23 0xffffffff8066c6db in sys_kldload (td=0xfffff80178059000,
uap=<value optimized out>)
at /data/rhea/usr/src/sys/kern/kern_linker.c:1057
This panic occurs when "pptdev" kernel environment is not set.
Attached patch fixes this problem, I think.
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