Created attachment 148601 [details] 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.
Can't reproduce in FreeBSD hammer 14.0-CURRENT FreeBSD 14.0-CURRENT #8 main-n260121-431d2a81d421: Tue Jan 17 12:07:04 CET 2023 root@hammer:/usr/obj/usr/home/fernape/FreeBSD-repos/src/amd64.amd64/sys/GENERIC amd64 Loads vmm.ko without pptdev.