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Mikhail T.

2008-Apr-20 23:30 UTC

panic: ffs_truncate: readonly filesystem

Hello!

I tried, accidentally, to save a video-file (via firewire) to a
read-only location.

The entire system paniced with the message in subject. Why did it
happen?

Thanks!

	-mi

Kostik Belousov

2008-Apr-21 11:28 UTC

head link

panic: ffs_truncate: readonly filesystem

On Sun, Apr 20, 2008 at 07:10:44PM -0400, Mikhail T.
wrote:> Hello!
> 
> I tried, accidentally, to save a video-file (via firewire) to a
> read-only location.
> 
> The entire system paniced with the message in subject. Why did it
> happen?Because the kernel has a bug ? As is, the report is useless. Please, do
not hesitate to provide at least the backtrace.

The ufs_setattr() seems to properly check for ro mounts, as well as the
direct callers of the UFS_TRUNCATE() function.

Besides the possible logic error, the other possibility is the concurrent
remount. Could it be that you actually remounted the fs readonly during
the write ?
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Mikhail Teterin

2008-Apr-21 12:27 UTC

head link

panic: ffs_truncate: readonly filesystem

On ????????? 21 ??????? 2008, Kostik Belousov wrote:
= Because the kernel has a bug ? As is, the report is useless. Please, do
= not hesitate to provide at least the backtrace.

The backtrace is attached. The filesystem is thus (newfs -N):

/store: 476940.0MB (976773168 sectors) block size 16384, fragment size 2048
        using 2597 cylinder groups of 183.72MB, 11758 blks, 23552 inodes.

= Besides the possible logic error, the other possibility is the concurrent
= remount. Could it be that you actually remounted the fs readonly during
= the write ?

No... It is mounted readonly by default and when I want to add more files, I 
remount it read-write. This one time I forgot to do it...

Thanks,

	-mi
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[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so:
Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
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welcome to change it and/or distribute copies of it under certain conditions.
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details.
This GDB was configured as "amd64-marcel-freebsd".
There is no member named pathname.
Reading symbols from /opt/modules/fuse.ko...done.
Loaded symbols for /opt/modules/fuse.ko
Reading symbols from /opt/modules/rtc.ko...done.
Loaded symbols for /opt/modules/rtc.ko

Unread portion of the kernel message buffer:
g_vfs_done():ad8[WRITE(offset=161248411648, length=131072)]error = 1
g_vfs_done():ad8[WRITE(offset=161242284032, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248411648, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248428032, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248444416, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248460800, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248477184, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248493568, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248509952, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248526336, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248542720, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248559104, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248575488, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248591872, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161242284032, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161242284032, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248411648, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248428032, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248444416, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248460800, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248477184, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248493568, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248509952, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248526336, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248542720, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248559104, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248575488, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248591872, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161242284032, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248411648, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248428032, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248444416, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248460800, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248477184, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248493568, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248509952, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248526336, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248542720, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248559104, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248575488, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248591872, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161242284032, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248411648, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248428032, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248444416, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248460800, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248477184, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248493568, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248509952, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248526336, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248542720, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248559104, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248575488, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248591872, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161242284032, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248411648, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248428032, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248444416, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248460800, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248477184, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248493568, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248509952, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248526336, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248542720, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248559104, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248575488, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248591872, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248411648, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248428032, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248444416, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248460800, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248477184, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248493568, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248509952, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248526336, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248542720, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248559104, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248575488, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248591872, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248411648, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248428032, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248444416, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248460800, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248477184, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248493568, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248509952, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248526336, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248542720, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248559104, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248575488, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248591872, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248411648, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248428032, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248444416, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248460800, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248477184, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248493568, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248509952, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248526336, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248542720, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248559104, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248575488, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248591872, length=16384)]error = 1
g_vfs_done():ad8[WRITE(offset=161248411648, length=16384)]error = 1
panic: ffs_truncate: read-only filesystem
cpuid = 1
Uptime: 2m37s
Physical memory: 3607 MB
Dumping 485 MB: 470 454 438 422 406 390 374 358 342 326 310 294 278 262 246
230fs = /store
panic: ffs_sync: rofs mod
cpuid = 1
 214 198 182 166 150 134 118 102 86 70 54 38 22 6

#0  doadump () at pcpu.h:194
194		__asm __volatile("movq %%gs:0,%0" : "=r" (td));
(kgdb) #0  doadump () at pcpu.h:194
#1  0x0000000000000004 in ?? ()
#2  0xffffffff802e8b60 in boot (howto=260)
    at /var/src/sys/kern/kern_shutdown.c:409
#3  0xffffffff802e8f7d in panic (fmt=0x104 <Address 0x104 out of bounds>)
    at /var/src/sys/kern/kern_shutdown.c:563
#4  0xffffffff803f3513 in ffs_truncate (vp=Variable "vp" is not
available.
)
    at /var/src/sys/ufs/ffs/ffs_inode.c:248
#5  0xffffffff8040be0b in ffs_write (ap=0xffffffffb05a4a10)
    at /var/src/sys/ufs/ffs/ffs_vnops.c:800
#6  0xffffffff8049d485 in VOP_WRITE_APV (vop=0xffffffff806536c0, 
    a=0xffffffffb05a4a10) at vnode_if.c:691
#7  0xffffffff8036fd20 in vn_write (fp=0xffffff000360bb40, 
    uio=0xffffffffb05a4b00, active_cred=Variable "active_cred" is not
available.
) at vnode_if.h:373
#8  0xffffffff8031d638 in dofilewrite (td=0xffffff0003324340, fd=4, 
    fp=0xffffff000360bb40, auio=0xffffffffb05a4b00, offset=Variable
"offset" is not available.
) at file.h:254
#9  0xffffffff8031d93e in kern_writev (td=0xffffff0003324340, fd=4, 
    auio=0xffffffffb05a4b00) at /var/src/sys/kern/sys_generic.c:401
#10 0xffffffff8031d9bc in write (td=0x0, uap=0x0)
    at /var/src/sys/kern/sys_generic.c:317
#11 0xffffffff8045a700 in syscall (frame=0xffffffffb05a4c70)
    at /var/src/sys/amd64/amd64/trap.c:852
#12 0xffffffff8043f38b in Xfast_syscall ()
    at /var/src/sys/amd64/amd64/exception.S:290
#13 0x000000080070a32c in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)

freebsd stable - Apr 2008 - panic: ffs_truncate: readonly filesystem

panic: ffs_truncate: readonly filesystem

panic: ffs_truncate: readonly filesystem

panic: ffs_truncate: readonly filesystem