URL:
<http://savannah.gnu.org/bugs/?19473>
Summary: Running a fatfs translator on a node N can crash
the file system server where N is on
Project: The GNU Hurd
Submitted by: tschwinge
Submitted on: Friday 03/30/07 at 20:14
Category: Hurd Servers
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Reproducibility: Every Time
Size (loc): None
Planned Release: None
Effort: 0.00
Wiki-like text discussion box:
_______________________________________________________
Details:
The current Debian-shipped fatfs translator doesn't work. I got a statically
linked one to work. However, the current `/hurd/fatfs' will, when run on a
node N, crash the file system server where N is on. It goes like this:
#v+
Program received signal EXC_BAD_ACCESS, Could not access memory.
[Switching to thread 459.10]
0x010f8000 in _hurd_intr_rpc_msg_sp_restored () from /lib/libc.so.0.3
(gdb) bt
#0 0x010f8000 in _hurd_intr_rpc_msg_sp_restored () from /lib/libc.so.0.3
#1 0x01273768 in fsys_getroot () from /lib/libhurduser.so.0.3
#2 0x0105f4ea in fshelp_fetch_root (box=0x8065cec, cookie=0x805ef18,
dotdot=37, user=0x805eec0, flags=64,
callback1=0x1037d10 <short_circuited_callback1.10167>,
callback2=0x104dbf0 <_diskfs_translator_callback2_fn>, retry=0x132df74,
retryname=0x132df7c "", root=0x132e380) at
/var/tmp/hurd-io+stat+fatfs/hurd-20060825/build-tree/hurd/libfshelp/fetch-root.c:179
#3 0x0103844e in diskfs_S_dir_lookup (dircred=0x805ee68, path=0x132bf5c "b",
flags=<value optimized out>, mode=0, retry=0x132df74,
retryname=0x132df7c "", returned_port=0x132e380,
returned_port_poly=0x132be60)
at
/var/tmp/hurd-io+stat+fatfs/hurd-20060825/build-tree/hurd/libdiskfs/dir-lookup.c:275
#4 0x01040cab in _Xdir_lookup (InHeadP=0x132bf40, OutHeadP=0x132df50) at
fsServer.c:1521
#5 0x0103e9ad in diskfs_fs_server (InHeadP=0x132bf40, OutHeadP=0x805d618) at
fsServer.c:2682
#6 0x0103719e in diskfs_demuxer (inp=0x132bf40, outp=0x132df50)
at
/var/tmp/hurd-io+stat+fatfs/hurd-20060825/build-tree/hurd/libdiskfs/demuxer.c:32
#7 0x010aedfd in internal_demuxer (inp=0x132bf40, outheadp=0x132df50)
at
/var/tmp/hurd-io+stat+fatfs/hurd-20060825/build-tree/hurd/libports/manage-multithread.c:119
#8 0x010dcd32 in mach_msg_server_timeout () from /lib/libc.so.0.3
#9 0x010aeb84 in thread_function.7379 () at
/var/tmp/hurd-io+stat+fatfs/hurd-20060825/build-tree/hurd/libports/manage-multithread.c:170
#10 0x010a892d in cthread_body (self=0x8066c70) at
/var/tmp/hurd-io+stat+fatfs/hurd-20060825/build-tree/hurd/libthreads/cthreads.c:306
#11 0x00000000 in ?? ()
(gdb) x/5i $pc
0x10f8000 <_hurd_intr_rpc_msg_sp_restored+977>: mov (%edi),%eax
0x10f8002 <_hurd_intr_rpc_msg_sp_restored+979>: inc %esi
0x10f8003 <_hurd_intr_rpc_msg_sp_restored+980>: add $0x4,%edi
0x10f8006 <_hurd_intr_rpc_msg_sp_restored+983>: mov %eax,0x4(%esp)
0x10f800a <_hurd_intr_rpc_msg_sp_restored+987>: mov 0xffffffbc(%ebp),%ecx
(gdb) info registers
eax 0x2 2
ecx 0x11 17
edx 0x805d618 134600216
ebx 0x124067c 19138172
esp 0x132aaa4 0x132aaa4
ebp 0x132ab0c 0x132ab0c
esi 0x1 1
edi 0x25 37
eip 0x10f8000 0x10f8000
<_hurd_intr_rpc_msg_sp_restored+977>
eflags 0x10202 [ IF RF ]
cs 0x17 23
ss 0x1f 31
ds 0x1f 31
es 0x1f 31
fs 0x1f 31
gs 0x1f 31
#v-
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