On Sat, Sep 7, 2013 at 10:44 PM, Toralf Förster <[email protected]> wrote:
> Today I run latest git tree with a patched UML (this patch + one for xterm
> issues) and got 2 times a core dump
> when I fuzzy test an UML machine with a nearly identical scenario as already
> described but just shutdowned
> both UML images instead of shooting one of it in the head.
>
> I'll probably need time to figure out a test case, but just as a pre-info
> here's the back trace:
>
> tfoerste@n22 ~ $ gdb --core=/mnt/ramdisk/core
> /usr/local/bin/linux-v3.11-7550-g768c9d3 -n -batch -ex bt
>
> warning: core file may not match specified executable file.
> [New LWP 7470]
> [New LWP 7479]
> [New LWP 7477]
> [New LWP 7478]
> Core was generated by `/usr/local/bin/linux-v3.11-7550-g768c9d3 earlyprintk
> ubda=/home/tfoerste/virtua'.
> Program terminated with signal 6, Aborted.
> #0 0xb77be424 in __kernel_vsyscall ()
> #0 0xb77be424 in __kernel_vsyscall ()
> #1 0x083aada5 in kill ()
> #2 0x0807163d in uml_abort () at arch/um/os-Linux/util.c:93
> #3 0x08071925 in os_dump_core () at arch/um/os-Linux/util.c:138
> #4 0x080613a7 in panic_exit (self=0x85b1518 <panic_exit_notifier>,
> unused1=0, unused2=0x85e76e0 <buf.15920>) at arch/um/kernel/um_arch.c:240
> #5 0x0809a398 in notifier_call_chain (nl=0x0, val=0, v=0x85e76e0
> <buf.15920>, nr_to_call=-2, nr_calls=0x0) at kernel/notifier.c:93
> #6 0x0809a4e3 in __atomic_notifier_call_chain (nr_calls=<optimized out>,
> nr_to_call=<optimized out>, v=<optimized out>, val=<optimized out>,
> nh=<optimized out>) at kernel/notifier.c:182
> #7 atomic_notifier_call_chain (nh=0x85e76c4 <panic_notifier_list>, val=0,
> v=0x85e76e0 <buf.15920>) at kernel/notifier.c:191
> #8 0x08408628 in panic (fmt=0x0) at kernel/panic.c:128
> #9 0x081131c9 in shrink_dcache_for_umount_subtree (dentry=0x428028f0) at
> fs/dcache.c:941
That is:
if (dentry->d_lockref.count != 0) {
printk(KERN_ERR
"BUG: Dentry %p{i=%lx,n=%s}"
" still in use (%d)"
" [unmount of %s %s]\n",
dentry,
dentry->d_inode ?
dentry->d_inode->i_ino : 0UL,
dentry->d_name.name,
dentry->d_lockref.count,
dentry->d_sb->s_type->name,
dentry->d_sb->s_id);
BUG();
}
Do you also have the console output?
--
Thanks,
//richard
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