[Bug 220141] sysutils/pefs-kmod: panic: stack overflow detected

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220141

            Bug ID: 220141
           Summary: sysutils/pefs-kmod: panic: stack overflow detected
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: gleb at FreeBSD.org
          Reporter: mikael.urankar at gmail.com
             Flags: maintainer-feedback?(gleb at FreeBSD.org)
          Assignee: gleb at FreeBSD.org

Hi,

I got a kernel panic on head r320060 doing pefs mount /home/mik /home/mik


FreeBSD cocyte 12.0-CURRENT FreeBSD 12.0-CURRENT #3 r320060: Sun Jun 18
05:51:19 CEST 2017     root at xxx:/usr/obj/usr/src/sys/GENERIC-NODEBUG  amd64

pefs: AESNI hardware acceleration enabled
panic: stack overflow detected; backtrace may be corrupted
cpuid = 2
time = 1497900539
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe02362fc3f0
vpanic() at vpanic+0x19c/frame 0xfffffe02362fc470
panic() at panic+0x43/frame 0xfffffe02362fc4d0
__stack_chk_fail() at __stack_chk_fail+0x12/frame 0xfffffe02362fc4e0
pefs_statfs() at pefs_statfs+0x122/frame 0xfffffe02362fc6f0
KDB: enter: panic
<snip>
__curthread () at ./machine/pcpu.h:232
warning: Source file is more recent than executable.
232             __asm("movq %%gs:%1,%0" : "=r" (td)
(kgdb) #0  __curthread () at ./machine/pcpu.h:232
#1  doadump (textdump=0) at /usr/src/sys/kern/kern_shutdown.c:318
#2  0xffffffff803a33cb in db_dump (dummy=<optimized out>, 
    dummy2=<error reading variable: access outside bounds of object referenced
via synthetic pointer>, dummy3=<unavailable>, dummy4=<unavailable>)
    at /usr/src/sys/ddb/db_command.c:546
#3  0xffffffff803a31bf in db_command (last_cmdp=<optimized out>, 
    cmd_table=<optimized out>, dopager=<optimized out>)
    at /usr/src/sys/ddb/db_command.c:453
#4  0xffffffff803a2ef4 in db_command_loop ()
    at /usr/src/sys/ddb/db_command.c:506
#5  0xffffffff803a602f in db_trap (type=<optimized out>, code=<optimized out>)
    at /usr/src/sys/ddb/db_main.c:248
#6  0xffffffff80ac2cb3 in kdb_trap (type=3, code=-61456, tf=<optimized out>)
    at /usr/src/sys/kern/subr_kdb.c:654
#7  0xffffffff80f0c6ee in trap (frame=0xfffffe02362fc320)
    at /usr/src/sys/amd64/amd64/trap.c:537
#8  <signal handler called>
#9  kdb_enter (why=0xffffffff814669f0 "panic", msg=<optimized out>)
    at /usr/src/sys/kern/subr_kdb.c:444
#10 0xffffffff80a7f679 in vpanic (fmt=<optimized out>, ap=0xfffffe02362fc4b0)
    at /usr/src/sys/kern/kern_shutdown.c:772
#11 0xffffffff80a7f4b3 in panic (fmt=0x0)
    at /usr/src/sys/kern/kern_shutdown.c:710
#12 0xffffffff80aaf432 in __stack_chk_fail ()
    at /usr/src/sys/kern/stack_protector.c:17
#13 0xffffffff82839932 in pefs_statfs () from /boot/modules/pefs.ko

kernel, userland and pefs-kmod are in sync.
I can build a debug kernel and provide additional info if needed.



Thanks in advance

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