Hello, this panic happens when I kldunload if_igb(4) on 12.1-prerelease with debug kernel: Fatal trap 9: general protection fault while in kernel mode cpuid = 1; apic id = 01 instruction pointer = 0x20:0xffffffff80613313 stack pointer = 0x28:0xfffffe00005e1710 frame pointer = 0x28:0xfffffe00005e1740 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 = 1941 (kldunload) trap number = 9 panic: general protection fault cpuid = 1 time = 1568622439 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00005e1420 vpanic() at vpanic+0x19d/frame 0xfffffe00005e1470 panic() at panic+0x43/frame 0xfffffe00005e14d0 trap_fatal() at trap_fatal+0x39c/frame 0xfffffe00005e1530 trap() at trap+0x6c/frame 0xfffffe00005e1640 calltrap() at calltrap+0x8/frame 0xfffffe00005e1640 --- trap 0x9, rip = 0xffffffff80613313, rsp = 0xfffffe00005e1710, rbp = 0xfffffe00005e1740 --- _eventhandler_deregister() at _eventhandler_deregister+0x133/frame 0xfffffe00005e1740 iflib_deregister() at iflib_deregister+0x44/frame 0xfffffe00005e1760 iflib_device_deregister() at iflib_device_deregister+0x347/frame 0xfffffe00005e17b0 device_detach() at device_detach+0x185/frame 0xfffffe00005e17f0 devclass_driver_deleted() at devclass_driver_deleted+0x4f/frame 0xfffffe00005e1830 devclass_delete_driver() at devclass_delete_driver+0x9d/frame 0xfffffe00005e1870 driver_module_handler() at driver_module_handler+0x10f/frame 0xfffffe00005e18c0 module_unload() at module_unload+0x32/frame 0xfffffe00005e18e0 linker_file_unload() at linker_file_unload+0x21b/frame 0xfffffe00005e1940 kern_kldunload() at kern_kldunload+0x10d/frame 0xfffffe00005e1980 amd64_syscall() at amd64_syscall+0x276/frame 0xfffffe00005e1ab0 fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe00005e1ab0 --- syscall (444, FreeBSD ELF64, sys_kldunloadf), rip = 0x8002db98a, rsp = 0x7fffffffe198, rbp = 0x7fffffffe9f0 --- KDB: enter: panic #9 0xffffffff805cf4ca in vpanic (fmt=<value optimized out>, ap=<value optimized out>) at /usr/local/share/deploy-tools/RELENG_12/src/sys/kern/kern_shutdown.c:866 #10 0xffffffff805cf273 in panic (fmt=<value optimized out>) at /usr/local/share/deploy-tools/RELENG_12/src/sys/kern/kern_shutdown.c:804 #11 0xffffffff8093a0bc in trap_fatal (frame=<value optimized out>, eva=<value optimized out>) at /usr/local/share/deploy-tools/RELENG_12/src/sys/amd64/amd64/trap.c:943 #12 0xffffffff809394bc in trap (frame=0xfffffe00005e1650) at RELENG_12/src/sys/amd64/include/counter.h:87 #13 0xffffffff80911c2c in calltrap () at /usr/local/share/deploy-tools/RELENG_12/src/sys/amd64/amd64/exception.S:289 #14 0xffffffff80613313 in _eventhandler_deregister (list=0xfffff8000295eb80, tag=0xfffff80002517600) at /usr/local/share/deploy-tools/RELENG_12/src/sys/kern/subr_eventhandler.c:198 #15 0xffffffff806fc524 in iflib_deregister (ctx=0xfffff800023e3800) at /usr/local/share/deploy-tools/RELENG_12/src/sys/net/iflib.c:5331 #16 0xffffffff806fd427 in iflib_device_deregister (ctx=<value optimized out>) at /usr/local/share/deploy-tools/RELENG_12/src/sys/net/iflib.c:5069 #17 0xffffffff80605ac5 in device_detach (dev=0xfffff80002951300) at device_if.h:234 #18 0xffffffff8060502f in devclass_driver_deleted (busclass=0xfffff800023eca80, dc=0xfffff80002884000, driver=0xffffffff81f58418) at /usr/local/share/deploy-tools/RELENG_12/src/sys/kern/subr_bus.c:1227 #19 0xffffffff80604f3d in devclass_delete_driver (busclass=0xfffff800023eca80, driver=0xffffffff81f58418) at /usr/local/share/deploy-tools/RELENG_12/src/sys/kern/subr_bus.c:1302 #20 0xffffffff8060addf in driver_module_handler (mod=0xfffff800024dd900, what=1, arg=0xffffffff81f583e8) at /usr/local/share/deploy-tools/RELENG_12/src/sys/kern/subr_bus.c:5172 #21 0xffffffff805b3ee2 in module_unload (mod=0xfffff800024dd900) at /usr/local/share/deploy-tools/RELENG_12/src/sys/kern/kern_module.c:261 #22 0xffffffff805a65bb in linker_file_unload (file=0xfffff8000380b400, flags=-1) at /usr/local/share/deploy-tools/RELENG_12/src/sys/kern/kern_linker.c:697 #23 0xffffffff805a790d in kern_kldunload (td=<value optimized out>, fileid=13, flags=0) at /usr/local/share/deploy-tools/RELENG_12/src/sys/kern/kern_linker.c:1132 ---Type <return> to continue, or q <return> to quit--- #24 0xffffffff8093abe6 in amd64_syscall (td=0xfffff80003cc7000, traced=0) at RELENG_12/src/sys/amd64/amd64/../../kern/subr_syscall.c:135 #25 0xffffffff80912550 in fast_syscall_common () at /usr/local/share/deploy-tools/RELENG_12/src/sys/amd64/amd64/exception.S:581 #26 0x00000008002db98a in ?? () Previous frame inner to this frame (corrupt stack?) In one of my setups, I depend on unloading if_igb(4) at runtime, so I hope this can be fixed without too much hassle. Like mentioned, at least in my case this isn't cosemtics only. Thanks, -Harry
Is https://reviews.freebsd.org/D21711 supposed to address this issue? Guess so, will test.
Yeah, it looks like it. Sorry, the original review didn't have the PR number, but it did fix a problem we were encountering internally at Intel.
(In reply to Eric Joyner from comment #2) Thanks, meanwhile I can confirm that https://svnweb.freebsd.org/changeset/base/352655 fixes the issue for me on 12.1-BETA1. I'd like to take the chance and point to https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240609 This seems to be a major issue, although not affecting non-debug kernels, so I don't add bug 240700 as blocker. Should I? Do you take over this report and close after MFC+MFSing? Thanks, -harry
Yeah. I'll MFC the fix after a bit and then close it.
This fix has been merged into stable/12 (r352910) and releng/12.1 (r352912).