https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221957
Bug ID: 221957
Summary: cam iosched: Add a handler for the quanta sysctl to
enforce valid values
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Keywords: patch
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: f...@fabiankeil.de
Flags: mfc-stable11?
Created attachment 185948
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=185948&action=edit
cam iosched: Add a handler for the quanta sysctl to enforce valid values
The attached patch adds a handler for the iosched quanta sysctl
to enforce valid values
Invalid values can result in devision-by-zero panics and other
undesirable behaviour.
Example panic:
Fatal trap 18: integer divide fault while in kernel mode
cpuid = 0; apic id = 00
instruction pointer = 0x20:0xffffffff802998e5
stack pointer = 0x28:0xfffffe01ea3bf8d0
frame pointer = 0x28:0xfffffe01ea3bf900
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 = 12 (swi4: clock (0))
trap number = 18
panic: integer divide fault
cpuid = 0
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
0xfffffe01ea3bf510
vpanic() at vpanic+0x186/frame 0xfffffe01ea3bf590
panic() at panic+0x43/frame 0xfffffe01ea3bf5f0
trap_fatal() at trap_fatal+0x322/frame 0xfffffe01ea3bf640
trap() at trap+0x5e/frame 0xfffffe01ea3bf800
calltrap() at calltrap+0x8/frame 0xfffffe01ea3bf800
--- trap 0x12, rip = 0xffffffff802998e5, rsp = 0xfffffe01ea3bf8d0, rbp =
0xfffffe01ea3bf900 ---
cam_iosched_ticker() at cam_iosched_ticker+0x25/frame 0xfffffe01ea3bf900
softclock_call_cc() at softclock_call_cc+0x13e/frame 0xfffffe01ea3bf9b0
softclock() at softclock+0xb9/frame 0xfffffe01ea3bf9e0
intr_event_execute_handlers() at intr_event_execute_handlers+0xec/frame
0xfffffe01ea3bfa20
ithread_loop() at ithread_loop+0xd6/frame 0xfffffe01ea3bfa70
fork_exit() at fork_exit+0x85/frame 0xfffffe01ea3bfab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe01ea3bfab0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
Uptime: 2h29m20s
Dumping 1165 out of 8055
MB:..2%..11%..21%..31%..42%..51%..61%..71%..81%..91%
Obtained from: ElectroBSD
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