From: "J. Bruce Fields" <bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
Subject: Re: Issues with a rather unusual configured NFS server
Date: Tue, 10 Sep 2013 10:09:37 -0400
Message-ID: <20130910140937.GD16011@fieldses.org>
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Cc: Jan Kara <jack-AlSwsSmVLrQ@public.gmane.org>,
	Linux NFS mailing list <linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"user-mode-linux-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org"
	<user-mode-linux-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>,
	linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Linux Kernel <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"J. Bruce Fields" <bfields-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Toralf =?utf-8?Q?F=C3=B6rster?= <toralf.foerster-Mmb7MZpHnFY@public.gmane.org>
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On Sat, Sep 07, 2013 at 10:44:00PM +0200, Toralf F=C3=B6rster 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.

>=20
> I'll probably need time to figure out a test case, but just as a pre-=
info here's the back trace:
>=20
> tfoerste@n22 ~ $ gdb --core=3D/mnt/ramdisk/core /usr/local/bin/linux-=
v3.11-7550-g768c9d3 -n -batch -ex bt
>=20
> 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 early=
printk ubda=3D/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=3D0x85b1518 <panic_exit_notifier>,=
 unused1=3D0, unused2=3D0x85e76e0 <buf.15920>) at arch/um/kernel/um_arc=
h.c:240
> #5  0x0809a398 in notifier_call_chain (nl=3D0x0, val=3D0, v=3D0x85e76=
e0 <buf.15920>, nr_to_call=3D-2, nr_calls=3D0x0) at kernel/notifier.c:9=
3
> #6  0x0809a4e3 in __atomic_notifier_call_chain (nr_calls=3D<optimized=
 out>, nr_to_call=3D<optimized out>, v=3D<optimized out>, val=3D<optimi=
zed out>, nh=3D<optimized out>) at kernel/notifier.c:182
> #7  atomic_notifier_call_chain (nh=3D0x85e76c4 <panic_notifier_list>,=
 val=3D0, v=3D0x85e76e0 <buf.15920>) at kernel/notifier.c:191
> #8  0x08408628 in panic (fmt=3D0x0) at kernel/panic.c:128
> #9  0x081131c9 in shrink_dcache_for_umount_subtree (dentry=3D0x428028=
f0) at fs/dcache.c:941
> #10 0x08113948 in shrink_dcache_for_umount (sb=3D0x463b8000) at fs/dc=
ache.c:1002
> #11 0x08101677 in generic_shutdown_super (sb=3D0x463b8000) at fs/supe=
r.c:404
> #12 0x08102395 in kill_anon_super (sb=3D0x0) at fs/super.c:875
> #13 0x081d3ff8 in nfs_kill_super (s=3D0x0) at fs/nfs/super.c:2598
> #14 0x0810153a in deactivate_locked_super (s=3D0x463b8000) at fs/supe=
r.c:294
> #15 0x081015d1 in deactivate_super (s=3D0x463b8000) at fs/super.c:319
> #16 0x08119c0c in mntfree (mnt=3D<optimized out>) at fs/namespace.c:8=
91
> #17 mntput_no_expire (mnt=3D0x0) at fs/namespace.c:929
> #18 0x0811b195 in SYSC_umount (flags=3D<optimized out>, name=3D<optim=
ized out>) at fs/namespace.c:1335
> #19 SyS_umount (name=3D134633856, flags=3D2) at fs/namespace.c:1305
> #20 0x080618e2 in handle_syscall (r=3D0x498be5d4) at arch/um/kernel/s=
kas/syscall.c:35
> #21 0x08073c0d in handle_trap (local_using_sysemu=3D<optimized out>, =
regs=3D<optimized out>, pid=3D<optimized out>) at arch/um/os-Linux/skas=
/process.c:198
> #22 userspace (regs=3D0x498be5d4) at arch/um/os-Linux/skas/process.c:=
431
> #23 0x0805e65c in fork_handler () at arch/um/kernel/process.c:160
> #24 0x00000000 in ?? ()
>=20
>=20
>=20
> --=20
> MfG/Sincerely
> Toralf F=C3=B6rster
> pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
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