Re: Issues with a rather unusual configured NFS server

[J. Bruce Fields]

On Sat, Sep 07, 2013 at 10:44:00PM +0200, Toralf FÃrster 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.

This is a slightly different test case, so for now it sounds like this
could be a preexisting problem, not a regression?

--b.

> 
> 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
> #10 0x08113948 in shrink_dcache_for_umount (sb=0x463b8000) at fs/dcache.c:1002
> #11 0x08101677 in generic_shutdown_super (sb=0x463b8000) at fs/super.c:404
> #12 0x08102395 in kill_anon_super (sb=0x0) at fs/super.c:875
> #13 0x081d3ff8 in nfs_kill_super (s=0x0) at fs/nfs/super.c:2598
> #14 0x0810153a in deactivate_locked_super (s=0x463b8000) at fs/super.c:294
> #15 0x081015d1 in deactivate_super (s=0x463b8000) at fs/super.c:319
> #16 0x08119c0c in mntfree (mnt=<optimized out>) at fs/namespace.c:891
> #17 mntput_no_expire (mnt=0x0) at fs/namespace.c:929
> #18 0x0811b195 in SYSC_umount (flags=<optimized out>, name=<optimized out>) at fs/namespace.c:1335
> #19 SyS_umount (name=134633856, flags=2) at fs/namespace.c:1305
> #20 0x080618e2 in handle_syscall (r=0x498be5d4) at arch/um/kernel/skas/syscall.c:35
> #21 0x08073c0d in handle_trap (local_using_sysemu=<optimized out>, regs=<optimized out>, pid=<optimized out>) at arch/um/os-Linux/skas/process.c:198
> #22 userspace (regs=0x498be5d4) at arch/um/os-Linux/skas/process.c:431
> #23 0x0805e65c in fork_handler () at arch/um/kernel/process.c:160
> #24 0x00000000 in ?? ()
> 
> 
> 
> -- 
> MfG/Sincerely
> Toralf FÃrster
> pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
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