[ open-vm-tools-Tracker-3584834 ] vmhgfs kernel module panics on FreeBSD

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Tracker item #3584834, was opened at 2012-11-06 12:16
Message generated for change (Comment added) made by kot
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Category: kernel modules
Group: None
Status: Open
Resolution: None
Priority: 8
Private: No
Submitted By: Mikhail Teterin (kot)
Assigned to: Nobody/Anonymous (nobody)
Summary: vmhgfs kernel module panics on FreeBSD

Initial Comment:
The problem reported in bug 3584833 suggests, the module has not been tested on FreeBSD in a while... Indeed, after fixing the build, and trying to use the module I get the following kernel panic (this is FreeBSD/x86 8.3, 32-bit):

Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address   = 0x4
...
#6  0xc07c0d2c in calltrap () at /mi/src/sys/i386/i386/exception.s:168
#7  0xc83add06 in DblLnkLst_Link (l1=0xc6ff3644, l2=0xc7560000)
    at dbllnklst.h:153
#8  0xc83adcdb in DblLnkLst_LinkLast (head=0xc6ff3644, l=0xc7560000)
    at dbllnklst.h:286
#9  0xc83adcab in HgfsKReq_AllocateRequest (container=0xc6ff3640, 
    errorRet=0xe9461994) at request.c:418
#10 0xc83b2da6 in HgfsStatfsInt (vp=0xc831ca78, stat=0xc727ecf4)
    at vfsopscommon.c:77
#11 0xc83aa44b in HgfsVfsMount (mp=0xc727ec94) at vfsops.c:258
#12 0xc0670732 in vfs_donmount (td=0xc78825c0, fsflags=0, fsoptions=0xc728bd00)
    at /mi/src/sys/kern/vfs_mount.c:1011
#13 0xc0671011 in nmount (td=0xc78825c0, uap=0xe9461cec)
    at /mi/src/sys/kern/vfs_mount.c:447
...

Examining frame #7 reveals:

(kgdb) p *l1
$1 = {prev = 0x0, next = 0xc7560000}
(kgdb) p *l2
$2 = {prev = 0x0, next = 0x0}

And then:
(kgdb) up  
#8  0xc83adcdb in DblLnkLst_LinkLast (head=0xc6ff3644, l=0xc7560000)
    at dbllnklst.h:286
286     in dbllnklst.h
(kgdb) p *head
$3 = {prev = 0x0, next = 0xc7560000}
(kgdb) p *l
$4 = {prev = 0x0, next = 0x0}

(It is possible, the problem reported in bug 3580633 is related.)

I have the core-dump with debug symbols, so, if anybody cares for more variables, etc. let me know.

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>Comment By: Mikhail Teterin (kot)
Date: 2012-11-07 14:58

Message:
FWIW, I just tried the 9.2.2-893683 and got the exact same panic.

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Comment By: Mikhail Teterin (kot)
Date: 2012-11-06 12:20

Message:
I should add, that I experienced this problem with 9.2.0-799703.

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