[Bug 193075] New: netmap: attaching to 'vale0' with netmap-libpcap causes a kernel panic

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193075

            Bug ID: 193075
           Summary: netmap: attaching to 'vale0' with netmap-libpcap
                    causes a kernel panic
           Product: Base System
           Version: 10.0-STABLE
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: nenolod at tortois.es

To reproduce, run tcpdump -ni vale0 and your system kernel panics.

If this is an invalid parameter, it should of course not cause a kernel panic. 
So I am pretty sure this is a bug, even if I'm doing it wrong.

----

as6461-1-4 dumped core - see /var/crash/vmcore.1

Wed Aug 27 11:26:02 CDT 2014

FreeBSD as6461-1-4 10.1-PRERELEASE FreeBSD 10.1-PRERELEASE #1 r270719: Wed Aug
27 10:06:55 CDT 2014     kaniini at as6461-1-4:/usr/obj/usr/src/sys/CENTARRA 
amd64

panic: page fault

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Unread portion of the kernel message buffer:
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 1896 (tcpdump)
trap number             = 12
panic: page fault
cpuid = 1
KDB: stack backtrace:
#0 0xffffffff8092e950 at kdb_backtrace+0x60
#1 0xffffffff808f3c15 at panic+0x155
#2 0xffffffff80ced5ef at trap_fatal+0x38f
#3 0xffffffff80ced908 at trap_pfault+0x308
#4 0xffffffff80cecf6a at trap+0x47a
#5 0xffffffff80cd3042 at calltrap+0x8
#6 0xffffffff807e36c4 at devfs_ioctl_f+0x114
#7 0xffffffff80945515 at kern_ioctl+0x255
#8 0xffffffff8094526c at sys_ioctl+0x13c
#9 0xffffffff80cedf21 at amd64_syscall+0x351
#10 0xffffffff80cd332b at Xfast_syscall+0xfb
Uptime: 2m1s
Dumping 1358 out of 32722 MB:..2%..11%..21%..31%..41%..51%..61%..71%..81%..91%

Reading symbols from /boot/kernel/ums.ko.symbols...done.
Loaded symbols for /boot/kernel/ums.ko.symbols
#0  doadump (textdump=<value optimized out>) at pcpu.h:219
219     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) #0  doadump (textdump=<value optimized out>) at pcpu.h:219
#1  0xffffffff808f3892 in kern_reboot (howto=260)
    at /usr/src/sys/kern/kern_shutdown.c:452
#2  0xffffffff808f3c54 in panic (fmt=<value optimized out>)
    at /usr/src/sys/kern/kern_shutdown.c:759
#3  0xffffffff80ced5ef in trap_fatal (frame=<value optimized out>,
    eva=<value optimized out>) at /usr/src/sys/amd64/amd64/trap.c:865
#4  0xffffffff80ced908 in trap_pfault (frame=0xfffffe085f91e430,
    usermode=<value optimized out>) at /usr/src/sys/amd64/amd64/trap.c:676
#5  0xffffffff80cecf6a in trap (frame=0xfffffe085f91e430)
    at /usr/src/sys/amd64/amd64/trap.c:440
#6  0xffffffff80cd3042 in calltrap ()
    at /usr/src/sys/amd64/amd64/exception.S:232
#7  0xffffffff8062cb2e in netmap_ioctl (dev=0xfffff800174ef800,
    cmd=3223349521, data=0xfffff800170a34c0 "vale0", fflag=-65534,
    td=0xfffff80017637490) at /usr/src/sys/dev/netmap/netmap.c:2236
#8  0xffffffff807e36c4 in devfs_ioctl_f (fp=0xfffff8001752c9b0,
    com=3223349521, data=0xfffff800170a34c0, cred=<value optimized out>,
    td=0xfffff80017637490) at /usr/src/sys/fs/devfs/devfs_vnops.c:757
#9  0xffffffff80945515 in kern_ioctl (td=0xfffff80017637490,
    fd=<value optimized out>, com=18446735278003074240) at file.h:319
#10 0xffffffff8094526c in sys_ioctl (td=0xfffff80017637490,
    uap=0xfffffe085f91ea40) at /usr/src/sys/kern/sys_generic.c:702
#11 0xffffffff80cedf21 in amd64_syscall (td=0xfffff80017637490, traced=0)
    at subr_syscall.c:134
#12 0xffffffff80cd332b in Xfast_syscall ()
    at /usr/src/sys/amd64/amd64/exception.S:391
#13 0x0000000800e4d53a in ?? ()
Previous frame inner to this frame (corrupt stack?)
Current language:  auto; currently minimal
(kgdb)

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