[Bug 234444] cc_htcp + TCP_RFC7413

Thu Dec 27 14:03:29 UTC 2018

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234444

            Bug ID: 234444
           Summary: cc_htcp + TCP_RFC7413
           Product: Base System
           Version: 11.2-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: gonzahq at yandex.ru

/boot/loader.conf.local
cc_htcp_load="YES"

/etc/sysctl.conf
net.inet.tcp.cc.algorithm=htcp
net.inet.tcp.cc.htcp.adaptive_backoff=1
net.inet.tcp.cc.htcp.rtt_scaling=1

+

<kernel>
options     TCP_RFC7413

/etc/sysctl.conf
net.inet.tcp.fastopen.enabled=1

= kernel panic

hq dumped core - see /var/crash/vmcore.1

Thu Dec 27 11:28:57 MSK 2018

FreeBSD hq 11.2-STABLE FreeBSD 11.2-STABLE #1: Thu Dec 27 10:47:31 MSK 2018    
root at hq:/usr/src/sys/amd64/compile/HQ  amd64

panic: page fault

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Unread portion of the kernel message buffer:
[121] 
[121] 
[121] Fatal trap 12: page fault while in kernel mode
[121] cpuid = 0; apic id = 00
[121] fault virtual address     = 0x30
[121] fault code                = supervisor read data, page not present
[121] instruction pointer       = 0x20:0xffffffff804eab36
[121] stack pointer             = 0x28:0xfffffe083ed8d920
[121] frame pointer             = 0x28:0xfffffe083ed8d9c0
[121] code segment              = base 0x0, limit 0xfffff, type 0x1b
[121]                   = DPL 0, pres 1, long 1, def32 0, gran 1
[121] processor eflags  = interrupt enabled, resume, IOPL = 0
[121] current process           = 12 (swi4: clock (0))
[121] trap number               = 12
[121] panic: page fault
[121] cpuid = 0
[121] KDB: stack backtrace:
[121] #0 0xffffffff805175c7 at kdb_backtrace+0x67
[121] #1 0xffffffff804d3277 at vpanic+0x177
[121] #2 0xffffffff804d30f3 at panic+0x43
[121] #3 0xffffffff807e4c1f at trap_fatal+0x35f
[121] #4 0xffffffff807e4c79 at trap_pfault+0x49
[121] #5 0xffffffff807e4473 at trap+0x2d3
[121] #6 0xffffffff807c661c at calltrap+0x8
[121] #7 0xffffffff804eb029 at softclock+0x79
[121] #8 0xffffffff804a2189 at intr_event_execute_handlers+0xe9
[121] #9 0xffffffff804a2466 at ithread_loop+0xe6
[121] #10 0xffffffff8049f642 at fork_exit+0x82
[121] #11 0xffffffff807c75ce at fork_trampoline+0xe
[121] Uptime: 2m1s
[121] Dumping 1221 out of 32728
MB:..2%..11%..21%..31%..41%..52%..61%..71%..82%..91%

Reading symbols from /boot/kernel/cc_htcp.ko...Reading symbols from
/usr/lib/debug//boot/kernel/cc_htcp.ko.debug...done.
done.
Loaded symbols for /boot/kernel/cc_htcp.ko
#0  doadump (textdump=<value optimized out>) at pcpu.h:230
230     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) #0  doadump (textdump=<value optimized out>) at pcpu.h:230
#1  0xffffffff804d2e8a in kern_reboot (howto=260)
    at ../../../kern/kern_shutdown.c:383
#2  0xffffffff804d32b1 in vpanic (fmt=<value optimized out>, 
    ap=<value optimized out>) at ../../../kern/kern_shutdown.c:776
#3  0xffffffff804d30f3 in panic (fmt=<value optimized out>)
    at ../../../kern/kern_shutdown.c:707
#4  0xffffffff807e4c1f in trap_fatal (frame=0xfffffe083ed8d860, 
    eva=<value optimized out>) at ../../../amd64/amd64/trap.c:877
#5  0xffffffff807e4c79 in trap_pfault (frame=0xfffffe083ed8d860, 
    usermode=<value optimized out>) at cpufunc.h:832
#6  0xffffffff807e4473 in trap (frame=0xfffffe083ed8d860)
    at ../../../amd64/amd64/trap.c:415
#7  0xffffffff807c661c in calltrap () at ../../../amd64/amd64/exception.S:231
#8  0xffffffff804eab36 in softclock_call_cc (c=<value optimized out>, 
    cc=0xffffffff80d79e80, direct=0) at ../../../kern/kern_timeout.c:749
#9  0xffffffff804eb029 in softclock (arg=0xffffffff80d79e80)
    at ../../../kern/kern_timeout.c:867
#10 0xffffffff804a2189 in intr_event_execute_handlers (
    p=<value optimized out>, ie=0xfffff80005e9d700)
    at ../../../kern/kern_intr.c:1336
#11 0xffffffff804a2466 in ithread_loop (arg=0xfffff800082aa880)
    at ../../../kern/kern_intr.c:1349
#12 0xffffffff8049f642 in fork_exit (
    callout=0xffffffff804a2380 <ithread_loop>, arg=<value optimized out>, 
    frame=<value optimized out>) at ../../../kern/kern_fork.c:1072
#13 0xffffffff807c75ce in fork_trampoline ()
    at ../../../amd64/amd64/exception.S:972
#14 0x0000000000000000 in ?? ()
Current language:  auto; currently minimal
(kgdb)

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