[Bug 266054] panic: page fault in sys/ofed/drivers/infiniband/core/ib_cma.c:1060

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266054

            Bug ID: 266054
           Summary: panic: page fault in
                    sys/ofed/drivers/infiniband/core/ib_cma.c:1060
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: pkubaj@FreeBSD.org

I'm on CURRENT on 27c6009e7237597a502521e0255a74164ff6bea7 with our internal
irdma driver (newer than in vanilla FreeBSD, but with no other modifications).

I do (yes, wrong IP in rping):
ifconfig ice0 100.0.0.117/24
rping -svda 100.0.0.116

Instead of the usual error, there is an instant panic after:
created cm_id 0x128dd9c99000

The panic is:
(kgdb) #0  __curthread () at /usr/237bd1/sys/amd64/include/pcpu_aux.h:59
#1  dump_savectx () at /usr/237bd1/sys/kern/kern_shutdown.c:405
#2  0xffffffff80bf0495 in dumpsys (di=0x0)
    at /usr/237bd1/sys/x86/include/dump.h:87
#3  doadump (textdump=1) at /usr/237bd1/sys/kern/kern_shutdown.c:434
#4  kern_reboot (howto=260) at /usr/237bd1/sys/kern/kern_shutdown.c:541
#5  0xffffffff80bf08de in vpanic (fmt=<optimized out>,
    ap=ap@entry=0xfffffe029d759a50)
    at /usr/237bd1/sys/kern/kern_shutdown.c:979
#6  0xffffffff80bf0643 in panic (fmt=<unavailable>)
    at /usr/237bd1/sys/kern/kern_shutdown.c:903
#7  0xffffffff81160a29 in trap_fatal (frame=0xfffffe029d759b40, eva=40)
    at /usr/237bd1/sys/amd64/amd64/trap.c:955
#8  0xffffffff81160adb in trap_pfault (frame=0xfffffe029d759b40,
    usermode=false, signo=<optimized out>, ucode=<optimized out>)
    at /usr/237bd1/sys/amd64/amd64/trap.c:763
#9  <signal handler called>
#10 0xffffffff80e8de19 in cma_loopback_addr (addr=0xfffffe029d759c78)
    at /usr/237bd1/sys/ofed/drivers/infiniband/core/ib_cma.c:1060
#11 cma_any_addr (addr=0xfffffe029d759c78)
    at /usr/237bd1/sys/ofed/drivers/infiniband/core/ib_cma.c:1075
#12 rdma_bind_addr (id=0xfffff80156479c00, addr=addr@entry=0xfffffe029d759c78)
    at /usr/237bd1/sys/ofed/drivers/infiniband/core/ib_cma.c:3459
#13 0xffffffff80eb179f in ucma_bind_ip (linux_file=0xfffff80127d96380,
    inbuf=<optimized out>, in_len=<optimized out>, out_len=<optimized out>)
    at /usr/237bd1/sys/ofed/drivers/infiniband/core/ib_ucma.c:650
#14 0xffffffff80eb0c82 in ucma_write (filp=<optimized out>,
    buf=<optimized out>, len=48, pos=<optimized out>)
    at /usr/237bd1/sys/ofed/drivers/infiniband/core/ib_ucma.c:1635
#15 0xffffffff80e66ea7 in linux_file_write (file=0xfffff801220afaf0,
    uio=0xfffffe029d759da0, active_cred=<optimized out>,
    flags=<optimized out>, td=<optimized out>)
    at /usr/237bd1/sys/compat/linuxkpi/common/src/linux_compat.c:1592
#16 0xffffffff80c67001 in fo_write (fp=0xfffff801220afaf0,
    uio=0xfffffe029d759da0, active_cred=0x74000064061c0210,
    td=0xfffffe00f35cd720, flags=<optimized out>)
    at /usr/237bd1/sys/sys/file.h:349
#17 dofilewrite (td=td@entry=0xfffffe00f35cd720, fd=fd@entry=3,
    fp=0xfffff801220afaf0, auio=auio@entry=0xfffffe029d759da0,
    offset=offset@entry=-1, flags=flags@entry=0)
    at /usr/237bd1/sys/kern/sys_generic.c:565
#18 0xffffffff80c66b30 in kern_writev (td=0xfffffe00f35cd720, fd=3,
    auio=0xfffffe029d759da0) at /usr/237bd1/sys/kern/sys_generic.c:492
#19 sys_write (td=0xfffffe00f35cd720, uap=<optimized out>)
    at /usr/237bd1/sys/kern/sys_generic.c:407
#20 0xffffffff811613de in syscallenter (td=<optimized out>)
    at /usr/237bd1/sys/amd64/amd64/../../kern/subr_syscall.c:189
#21 amd64_syscall (td=0xfffffe00f35cd720, traced=0)
    at /usr/237bd1/sys/amd64/amd64/trap.c:1200
#22 <signal handler called>
#23 0x0000128dd91f413a in ?? ()

which suggests an issue in the OFED code.

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