Created attachment 177600 [details] core.txt FreeBSD 11.0-RELEASE-p2 #0: Mon Oct 24 06:55:27 UTC 2016 root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64 # cat /boot/loader.conf if_iwm_load="YES" iwm3160fw_load="YES" iwm7260fw_load="YES" iwm7265fw_load="YES" linux_load="YES" cuse4bsd_load="YES" Panics every time when webcamd_enable="YES" is added to rc.conf. If webcamd is started manually, panic does not happen immediately, and for a while the camera works, checked with pvcview. See core.txt.7 attached. Briefly: Fatal trap 12: page fault while in kernel mode cpuid = 2; apic id = 02 fault virtual address = 0x100000019 fault code = supervisor read data, page not present instruction pointer = 0x20:0xffffffff80b4392e stack pointer = 0x28:0xfffffe0234b714f0 frame pointer = 0x28:0xfffffe0234b71540 code segment = base rx0, limit 0xfffff, type 0x1b = DPL 0, pres 1, long 1, def32 0, gran 1 processor eflags = interrupt enabled, resume, IOPL = 0 current process = 378 (webcamd) trap number = 12 panic: page fault cpuid = 2 KDB: stack backtrace: #0 0xffffffff80b24077 at kdb_backtrace+0x67 #1 0xffffffff80ad93e2 at vpanic+0x182 #2 0xffffffff80ad9253 at panic+0x43 #3 0xffffffff80fa0d51 at trap_fatal+0x351 #4 0xffffffff80fa0f43 at trap_pfault+0x1e3 #5 0xffffffff80fa04ec at trap+0x26c #6 0xffffffff80f84141 at calltrap+0x8 #7 0xffffffff82581318 at cuse_server_close+0x178 #8 0xffffffff80985a35 at devfs_close+0x5e5 #9 0xffffffff8110ade9 at VOP_CLOSE_APV+0x89 #10 0xffffffff80bbdcce at vn_close+0x13e #11 0xffffffff80bbc77a at vn_closefile+0x4a #12 0xffffffff8098665c at devfs_close_f+0x2c #13 0xffffffff80a735ca at _fdrop+0x1a #14 0xffffffff80a770a4 at closef+0x2d4 #15 0xffffffff80a76b3d at fdescfree_fds+0x7d #16 0xffffffff80a766f2 at fdescfree+0x6a2 #17 0xffffffff80a8855a at exit1+0x73a
Suggested by scf@ in a private mail: "I do suspect it is the specific cuse module you are loading. It is possible that you are loading a module compiled for 10 when you are running 11. Regardless, you should not be loading cuse4bsd any longer. cuse(4) is part of FreeBSD 11 now. cuse_load="YES" is what you want." Indeed changing to cuse_load="YES" fixed to the problem. I think this PR can be closed. However, the webcamd man page needs updating because it still points to cuse4bsd: WEBCAMD(8) FreeBSD System Manager's Manual WEBCAMD(8) webcamd requires the cuse4bsd(3) kernel module. To load the driver as a module at boot time, place the following line in loader.conf(5): cuse4bsd_load="YES"
Is this still relevant?