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SubjectRe: BUG on unloading the fuse module
On Fri, Oct 05, 2007 at 11:37:58AM +0200, Miklos Szeredi wrote:
> > In 2.6.23-rc8-mm2, the fuse module always bugs on unloading.
>
> It's fixed in Greg's patch queue.
>
> This patch against -mm will also fix it.

Oh no, it panics:

[ 2.602060] general protection fault: 0000 [1] SMP
[ 2.603334] last sysfs file:
[ 2.604063] CPU 0
[ 2.604587] Modules linked in:
[ 2.605397] Pid: 1, comm: swapper Not tainted 2.6.23-rc8-mm2 #27
[ 2.606841] RIP: 0010:[<ffffffff810a5e0d>] [<ffffffff810a5e0d>] kfree+0x3d/0x110
[ 2.608613] RSP: 0000:ffff8100029dbac0 EFLAGS: 00000203
[ 2.609897] RAX: 0284087ebd278440 RBX: 0284087ebd278440 RCX: 000000000000003f
[ 2.611681] RDX: ffff81000000b000 RSI: ffff8100029e0830 RDI: 0006b6bea6b6b6b6
[ 2.613414] RBP: ffff8100029dbaf0 R08: ffffffff8152cb00 R09: 0000000000000000
[ 2.615135] R10: 0000000000000001 R11: 0000000000000008 R12: 6b6b6b6b6b6b6b6b
[ 2.616867] R13: ffff810002ab4e70 R14: ffffffff814f3360 R15: ffffffff813cc069
[ 2.618602] FS: 0000000000000000(0000) GS:ffffffff81512000(0000) knlGS:0000000000000000
[ 2.620134] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
[ 2.621188] CR2: 0000000000000000 CR3: 0000000001001000 CR4: 00000000000006e0
[ 2.622485] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2.623596] DR3: 0000000000000000 DR6: 0000000000000000 DR7: 0000000000000000
[ 2.624818] Process swapper (pid: 1, threadinfo ffff8100029da000, task ffff8100029e0000)
[ 2.626781] last branch before last exception/interrupt
[ 2.628033] from [<0000000000000000>]
[ 2.629009] to [<0000000000000000>]
[ 2.629925] Stack: ffffffff814f3360 ffff810003eb3958 ffffffff814f5c00 ffff810002ab4e70
[ 2.631979] ffffffff814f3360 ffffffff813cc069 ffff8100029dbb20 ffffffff81155422
[ 2.633851] ffff8100029bb9a8 ffff810003eb3960 ffffffff81155460 ffff8100029bb9a8
[ 2.635700] Call Trace:
[ 2.636427] [<ffffffff81155422>] kobject_cleanup+0x42/0x80
[ 2.636851] [<ffffffff8115546d>] kobject_release+0xd/0x10
[ 2.637076] [<ffffffff811565a3>] kref_put+0x43/0x80
[ 2.637291] [<ffffffff811553d9>] kobject_put+0x19/0x20
[ 2.637510] [<ffffffff811c0c25>] put_device+0x15/0x20
[ 2.637725] [<ffffffff811c1459>] device_unregister+0x19/0x20
[ 2.637958] [<ffffffff811c1519>] device_destroy+0xb9/0xd0
[ 2.638187] [<ffffffff8119e9e1>] tty_unregister_device+0x21/0x30
[ 2.638434] [<ffffffff811b84eb>] uart_remove_one_port+0x9b/0x120
[ 2.638680] [<ffffffff811bddc9>] serial8250_register_port+0x69/0x110
[ 2.638938] [<ffffffff811befd0>] serial_pnp_probe+0xf0/0x170
[ 2.639168] [<ffffffff81195ca2>] pnp_device_probe+0x82/0xe0
[ 2.639408] [<ffffffff811c3cb1>] driver_probe_device+0xa1/0x1c0
[ 2.639650] [<ffffffff811c3fa5>] __driver_attach+0xe5/0xf0
[ 2.639877] [<ffffffff811c2e93>] bus_for_each_dev+0x53/0x80
[ 2.640109] [<ffffffff811c3aec>] driver_attach+0x1c/0x20
[ 2.640331] [<ffffffff811c32b5>] bus_add_driver+0xa5/0x210
[ 2.640560] [<ffffffff811c41ed>] driver_register+0x4d/0x80
[ 2.640788] [<ffffffff811959e8>] pnp_register_driver+0x38/0x40
[ 2.641030] [<ffffffff81561b50>] serial8250_pnp_init+0x10/0x20
[ 2.641273] [<ffffffff8154078b>] kernel_init+0x15b/0x340
[ 2.641467] [<ffffffff8100d248>] child_rip+0xa/0x12
[ 2.641641]
[ 2.641706] INFO: lockdep is turned off.
[ 2.641838]
[ 2.641844] Code: 48 8b 00 25 00 40 02 00 48 3d 00 40 02 00 0f 84 a5 00 00 00
[ 2.642408] RIP [<ffffffff810a5e0d>] kfree+0x3d/0x110
[ 2.642598] RSP <ffff8100029dbac0>
[ 2.643388] Kernel panic - not syncing: Attempted to kill init!
Thank you,
Fengguang

> ---
>
> Index: linux/lib/kobject.c
> ===================================================================
> --- linux.orig/lib/kobject.c 2007-10-02 17:20:04.000000000 +0200
> +++ linux/lib/kobject.c 2007-10-03 13:58:42.000000000 +0200
> @@ -498,18 +498,17 @@ void kobject_cleanup(struct kobject * ko
> struct kobj_type * t = get_ktype(kobj);
> struct kset * s = kobj->kset;
> struct kobject * parent = kobj->parent;
> - const char *k_name = kobj->k_name;
>
> pr_debug("kobject %s: cleaning up\n",kobject_name(kobj));
> - kobj->k_name = NULL;
> - if (t && t->release)
> + if (t && t->release) {
> t->release(kobj);
> - else
> + kfree(kobj->k_name);
> + kobj->k_name = NULL;
> + } else
> pr_debug("kobject '%s' does not have a release() function, "
> "if this is not a directory kobject, it is broken "
> "and must be fixed.\n",
> - k_name);
> - kfree(k_name);
> + kobj->k_name);
> if (s)
> kset_put(s);
> kobject_put(parent);

-
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