https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209428
Bug ID: 209428
Summary: if_vtnet(4) panics when doing kldunload if_vtnet
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: no...@freebsd.org
When using if_vtnet(4) as a module and unloading it using "kldunload if_vtnet"
it immediately causes a panic:
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address = 0x80
fault code = supervisor read data, page not present
instruction pointer = 0x20:0xffffffff80cff56d
stack pointer = 0x28:0xfffffe0096eb28a0
frame pointer = 0x28:0xfffffe0096eb28d0
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 779 (kldunload)
[ thread pid 779 tid 100058 ]
Stopped at uma_zone_get_cur+0xd: movq 0x80(%r14),%rdi
db> bt
Tracing pid 779 tid 100058 td 0xfffff800064219a0
uma_zone_get_cur() at uma_zone_get_cur+0xd/frame 0xfffffe0096eb28d0
vtnet_modevent() at vtnet_modevent+0x51/frame 0xfffffe0096eb2900
module_unload() at module_unload+0x32/frame 0xfffffe0096eb2920
linker_file_unload() at linker_file_unload+0x24b/frame 0xfffffe0096eb2970
kern_kldunload() at kern_kldunload+0xbc/frame 0xfffffe0096eb29a0
amd64_syscall() at amd64_syscall+0x2db/frame 0xfffffe0096eb2ab0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe0096eb2ab0
--- syscall (444, FreeBSD ELF64, sys_kldunloadf), rip = 0x80086b15a, rsp =
0x7fffffffe348, rbp = 0x7fffffffebb0 ---
db>
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