[Bug 27652] New: 38-rc1: umount+rmmod cause ext4 error.

[Bug 27652] New: 38-rc1: umount+rmmod cause ext4 error.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=27652

           Summary: 38-rc1: umount+rmmod cause ext4 error.
           Product: File System
           Version: 2.5
    Kernel Version: 2.6.38-rc1
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@kernel-bugs.osdl.org
        ReportedBy: maciej.rutecki@gmail.com
                CC: rjw@sisk.pl, maciej.rutecki@gmail.com
        Regression: Yes


Subject    : 38-rc1: umount+rmmod cause ext4 error.
Submitter  : Tao Ma <tm@tao.ma>
Date       : 2011-01-19 6:53
Message-ID : 4D368A70.5030103@tao.ma
References : http://marc.info/?l=linux-ext4&m=129542001031750&w=2

This entry is being used for tracking a regression from 2.6.37. Please don't
close it until the problem is fixed in the mainline.

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[Bug 27652] 38-rc1: umount+rmmod cause ext4 error.

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Maciej Rutecki <maciej.rutecki@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |27352




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[Bug 27652] 38-rc1: umount+rmmod cause ext4 error.

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Eric Sandeen <sandeen@redhat.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sandeen@redhat.com




--- Comment #1 from Eric Sandeen <sandeen@redhat.com>  2011-01-26 20:41:05 ---
I believe patches have been sent that should fix this; there were
2 module unloading regressions in .37, both fixed.

If you can test with:

http://marc.info/?l=linux-ext4&m=129546975702198&w=2
and
http://marc.info/?l=linux-ext4&m=129527644524410&w=2

that'd be great.

Thanks,
-Eric

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[Bug 27652] 38-rc1: umount+rmmod cause ext4 error.

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Tao Ma <tm@tao.ma> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tm@tao.ma




--- Comment #2 from Tao Ma <tm@tao.ma>  2011-01-28 06:01:10 ---
ok, so I have applied the 2 patches. And now I did hit another bug every time,
I have tried to revert these 2 patches. And it still show up every time. I use
38-rc2 now. So Maciej, is it necessary to open another bug for it?

BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
IP: [<ffffffff8233d343>] _raw_spin_lock_irqsave+0x11/0x22
PGD 12292c067 PUD 10fdb6067 PMD 0 
Oops: 0002 [#1] SMP 
last sysfs file: /sys/devices/pci0000:00/0000:00:19.0/irq
CPU 1 
Modules linked in: ext4(-) jbd2 ipv6 autofs4 hidp rfcomm l2cap crc16 bluetooth
rfkill ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager ocfs2_stackglue
configfs lockd sunrpc cpufreq_ondemand acpi_cpufreq dm_mirror video sbs sbshc
battery acpi_memhotplug ac lp sg snd_hda_codec_analog snd_hda_intel
snd_hda_codec snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq
snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm option usb_wwan usbserial
rtc_cmos tpm_tis snd_timer snd soundcore tpm pcspkr i2c_i801 parport_pc e1000e
serio_raw dcdbas shpchp rtc_core rtc_lib i2c_core parport snd_page_alloc button
tpm_bios dm_region_hash dm_log dm_mod usb_storage ahci libahci libata sd_mod
scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd [last unloaded: microcode]

Pid: 4015, comm: rmmod Not tainted 2.6.38-rc2+ #30 0V4W66/OptiPlex 780          
RIP: 0010:[<ffffffff8233d343>]  [<ffffffff8233d343>]
_raw_spin_lock_irqsave+0x11/0x22
RSP: 0018:ffff88010fdbbe48  EFLAGS: 00010046
RAX: 0000000000000246 RBX: ffff88010fdbbe98 RCX: 00000000c0000100
RDX: 0000000000000100 RSI: ffff88010fdbbe98 RDI: 0000000000000020
RBP: ffff88010fdbbe48 R08: ffff88010fdba000 R09: ffff8800cfa0da70
R10: ffffffff82069498 R11: 0000000000000000 R12: 0000000000000020
R13: 0000000000000002 R14: 00007fffa52c5c60 R15: 0000000000000880
FS:  00007f7dd0d016e0(0000) GS:ffff8800cfa40000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000020 CR3: 000000011dc48000 CR4: 00000000000406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process rmmod (pid: 4015, threadinfo ffff88010fdba000, task ffff88012271e180)
Stack:
 ffff88010fdbbe88 ffffffff82055ee2 ffffffff82069498 ffff88010fdbbe98
 ffff88010fdbbe98 ffffffffa04d8440 0000000000000880 00007fffa52c5c60
 ffff88010fdbbed8 ffffffffa04ca2cc 0000000000000000 ffff88012271e180
Call Trace:
 [<ffffffff82055ee2>] prepare_to_wait+0x25/0x7b
 [<ffffffff82069498>] ? __try_stop_module+0x0/0x3d
 [<ffffffffa04ca2cc>] ext4_exit_fs+0x94/0x112 [ext4]
 [<ffffffff82055cdf>] ? autoremove_wake_function+0x0/0x3d
 [<ffffffff82067bce>] sys_delete_module+0x1b5/0x218
 [<ffffffff8207506f>] ? audit_syscall_entry+0x187/0x1ba
 [<ffffffff82002a6b>] system_call_fastpath+0x16/0x1b
Code: 1f 44 00 00 b8 00 01 00 00 f0 66 0f c1 07 38 e0 74 06 f3 90 8a 07 eb f6
c9 c3 55 48 89 e5 0f 1f 44 00 00 9c 58 fa ba 00 01 00 00 <f0> 66 0f c1 17 38 f2
74 06 f3 90 8a 17 eb f6 c9 c3 55 48 89 e5 
RIP  [<ffffffff8233d343>] _raw_spin_lock_irqsave+0x11/0x22
 RSP <ffff88010fdbbe48>
CR2: 0000000000000020
---[ end trace ec9d834b678544aa ]---

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[Bug 27652] 38-rc1: umount+rmmod cause ext4 error.

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--- Comment #3 from Tao Ma <tm@tao.ma>  2011-01-28 09:51:52 ---
Just tested with 37+the 2 patches. Still the same error.
So it isn't a 38 problem really.


BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
IP: [<ffffffff8233dabb>] _raw_spin_lock_irqsave+0x11/0x22
PGD 122b58067 PUD 122594067 PMD 0 
Oops: 0002 [#1] SMP 
last sysfs file: /sys/devices/virtual/misc/autofs/dev
CPU 1 
Modules linked in: ext4(-) jbd2 ipv6 autofs4 hidp rfcomm l2cap crc16 bluetooth
rfkill ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager ocfs2_stackglue
configfs cpufreq_ondemand acpi_cpufreq dm_mirror video output sbs sbshc battery
acpi_memhotplug ac lp sg snd_hda_codec_analog snd_hda_intel snd_hda_codec
snd_seq_dummy snd_seq_oss option usb_wwan snd_seq_midi_event snd_seq
snd_seq_device snd_pcm_oss usbserial snd_mixer_oss snd_pcm snd_timer rtc_cmos
snd rtc_core tpm_tis tpm i2c_i801 shpchp parport_pc parport serio_raw button
soundcore rtc_lib tpm_bios pcspkr dcdbas e1000e i2c_core snd_page_alloc
dm_region_hash dm_log dm_mod usb_storage ahci libahci libata sd_mod scsi_mod
ext3 jbd uhci_hcd ohci_hcd ehci_hcd

Pid: 4717, comm: rmmod Not tainted 2.6.37+ #2 0V4W66/OptiPlex 780               
RIP: 0010:[<ffffffff8233dabb>]  [<ffffffff8233dabb>]
_raw_spin_lock_irqsave+0x11/0x22
RSP: 0018:ffff88011f7ade48  EFLAGS: 00010046
RAX: 0000000000000246 RBX: ffff88011f7ade98 RCX: 00000000c0000100
RDX: 0000000000000100 RSI: ffff88011f7ade98 RDI: 0000000000000020
RBP: ffff88011f7ade48 R08: ffff88011f7ac000 R09: ffff8800cfa0da70
R10: ffff8800cfa51a00 R11: ffff88011f7add48 R12: 0000000000000020
R13: 0000000000000002 R14: 00007fff3d3ad400 R15: 0000000000000880
FS:  00007fe07ff0e6e0(0000) GS:ffff8800cfa40000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000020 CR3: 000000011ee14000 CR4: 00000000000406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process rmmod (pid: 4717, threadinfo ffff88011f7ac000, task ffff88012358f8d0)
Stack:
 ffff88011f7ade88 ffffffff82056d4e ffffffff8206a6e4 ffff88011f7ade98
 ffff88011f7ade98 ffffffffa0441500 0000000000000880 00007fff3d3ad400
 ffff88011f7aded8 ffffffffa0433428 0000000000000000 ffff88012358f8d0
Call Trace:
 [<ffffffff82056d4e>] prepare_to_wait+0x25/0x7b
 [<ffffffff8206a6e4>] ? __try_stop_module+0x0/0x3d
 [<ffffffffa0433428>] ext4_exit_fs+0x94/0x112 [ext4]
 [<ffffffff82056b4b>] ? autoremove_wake_function+0x0/0x3d
 [<ffffffff82069127>] sys_delete_module+0x1b5/0x218
 [<ffffffff820c26f9>] ? do_munmap+0x2e2/0x318
 [<ffffffff820767db>] ? audit_syscall_entry+0x1d6/0x209
 [<ffffffff82002aeb>] system_call_fastpath+0x16/0x1b
Code: 1f 44 00 00 b8 00 01 00 00 f0 66 0f c1 07 38 e0 74 06 f3 90 8a 07 eb f6
c9 c3 55 48 89 e5 0f 1f 44 00 00 9c 58 fa ba 00 01 00 00 <f0> 66 0f c1 17 38 f2
74 06 f3 90 8a 17 eb f6 c9 c3 55 48 89 e5 
RIP  [<ffffffff8233dabb>] _raw_spin_lock_irqsave+0x11/0x22
 RSP <ffff88011f7ade48>
CR2: 0000000000000020
---[ end trace e0bdca5906fdcbe6 ]---

--- Comment #4 from Eric Sandeen <sandeen@redhat.com>  2011-01-28 17:15:01 ---
Is that last oops with or without the patches I pointed at?

That might be in here:

static void ext4_destroy_lazyinit_thread(void)
{
        /*
         * If thread exited earlier
         * there's nothing to be done.
         */
        if (!ext4_li_info)
                return;

        ext4_clear_request_list();

        while (ext4_li_info->li_task) {
                wake_up(&ext4_li_info->li_wait_daemon);
                wait_event(ext4_li_info->li_wait_task,
                           ext4_li_info->li_task == NULL);
        }
}

> BUG: unable to handle kernel NULL pointer dereference at 0000000000000020

li_wait_task is 0x20 into the ext4_lazy_init struct... did ext4_li_info go
away?
It does get freed and set to NULL when the lazyinit thread exits.  I'm guessing
we need a little judicial application of ext4_li_mtx in the teardown thread.

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[Bug 27652] 38-rc1: umount+rmmod cause ext4 error.

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--- Comment #5 from Eric Sandeen <sandeen@redhat.com>  2011-01-28 17:32:13 ---
I could also be off base ;)  Is the filesystem under test created with the
lazy_itable_init feature?

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--- Comment #6 from Eric Sandeen <sandeen@redhat.com>  2011-01-28 22:07:53 ---
Ok it is in fact lazyinit uninit that's falling down, the wait_event is waiting
on something that gets freed.

This fixes it up for me:

Index: linux-2.6/fs/ext4/super.c
===================================================================
--- linux-2.6.orig/fs/ext4/super.c
+++ linux-2.6/fs/ext4/super.c
@@ -77,6 +77,7 @@ static struct dentry *ext4_mount(struct 
                const char *dev_name, void *data);
 static void ext4_destroy_lazyinit_thread(void);
 static void ext4_unregister_li_request(struct super_block *sb);
+static void ext4_clear_request_list(void);

 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) &&
defined(CONFIG_EXT4_USE_FOR_EXT23)
 static struct file_system_type ext3_fs_type = {
@@ -2704,6 +2705,8 @@ static void ext4_unregister_li_request(s
     mutex_unlock(&ext4_li_info->li_list_mtx);
 }

+static struct task_struct *ext4_lazyinit_task;
+
 /*
  * This is the function where ext4lazyinit thread lives. It walks
  * through the request list searching for next scheduled filesystem.
@@ -2772,6 +2775,10 @@ cont_thread:
         if (time_before(jiffies, next_wakeup))
             schedule();
         finish_wait(&eli->li_wait_daemon, &wait);
+        if (kthread_should_stop()) {
+            ext4_clear_request_list();
+            goto exit_thread;
+        }
     }

 exit_thread:
@@ -2796,6 +2803,7 @@ exit_thread:
     wake_up(&eli->li_wait_task);

     kfree(ext4_li_info);
+    ext4_lazyinit_task = NULL;
     ext4_li_info = NULL;
     mutex_unlock(&ext4_li_mtx);

@@ -2818,11 +2826,10 @@ static void ext4_clear_request_list(void

 static int ext4_run_lazyinit_thread(void)
 {
-    struct task_struct *t;
-
-    t = kthread_run(ext4_lazyinit_thread, ext4_li_info, "ext4lazyinit");
-    if (IS_ERR(t)) {
-        int err = PTR_ERR(t);
+    ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
+                     ext4_li_info, "ext4lazyinit");
+    if (IS_ERR(ext4_lazyinit_task)) {
+        int err = PTR_ERR(ext4_lazyinit_task);
         ext4_clear_request_list();
         del_timer_sync(&ext4_li_info->li_timer);
         kfree(ext4_li_info);
@@ -2976,13 +2983,7 @@ static void ext4_destroy_lazyinit_thread
     if (!ext4_li_info)
         return;

-    ext4_clear_request_list();

[Bug 27652] 38-rc1: umount+rmmod cause ext4 error.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=27652


Florian Mickler <florian@mickler.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |florian@mickler.org
         Resolution|                            |PATCH_ALREADY_AVAILABLE




--- Comment #7 from Florian Mickler <florian@mickler.org>  2011-01-29 12:02:12 ---
Patch: https://bugzilla.kernel.org/show_bug.cgi?id=27652#c6 

Tao Ma, does this work for you too?

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--- Comment #8 from Tao Ma <tm@tao.ma>  2011-01-30 02:36:58 ---
(In reply to comment #7)
> Patch: https://bugzilla.kernel.org/show_bug.cgi?id=27652#c6 
> 
> Tao Ma, does this work for you too?

Hi sorry for the delay.
So the patch works for the kernel panic.
Reported-and-Tested-by: Tao Ma <boyu.mt@taobao.com>

As for the original bug, it doesn't help. I can still get the error message.

slab error in kmem_cache_destroy(): cache `ext4_inode_cache': Can't free all
objects
Pid: 4674, comm: rmmod Not tainted 2.6.38-rc2+ #1
Call Trace:
 [<ffffffff820d61ac>] ? kmem_cache_destroy+0x83/0xc7
 [<ffffffffa03a9000>] ? destroy_inodecache+0x15/0x17 [ext4]
 [<ffffffffa03c7264>] ? ext4_exit_fs+0x30/0x60 [ext4]
 [<ffffffff82067bce>] ? sys_delete_module+0x1b5/0x218
 [<ffffffff8207506f>] ? audit_syscall_entry+0x187/0x1ba
 [<ffffffff82002a6b>] ? system_call_fastpath+0x16/0x1b
SLAB: cache with size 888 has lost its name

And as I pointed in the original mail, I have done some basic investigation and
it looks as if it is introduced by Nick's new ext4_i_callback.

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[Bug 27652] 38-rc1: umount+rmmod cause ext4 error.

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--- Comment #9 from Tao Ma <tm@tao.ma>  2011-01-30 02:41:57 ---
An off-topic question. How can I reopen this bug? I can't find a button to
reopen it to 'New' or 'Not Fixed'?

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Florian Mickler <florian@mickler.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|PATCH_ALREADY_AVAILABLE     |




--- Comment #10 from Florian Mickler <florian@mickler.org>  2011-01-30 19:47:35 ---
Well, the bugzilla could use a little love. Only the reporter or an obscure
group of people can change the status of bugs (as far as I know). But it is
also not possible to change the reporter. Don't know. Here you go...

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Florian Mickler <florian@mickler.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |NEW




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--- Comment #11 from Eric Sandeen <sandeen@redhat.com>  2011-01-31 16:07:56 ---
Seems we have about 4 regressions all tracked in 1 bugzilla, sadly.  1 bug per
regression would work better... though partly my fault for getting OT on the
original bug.

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--- Comment #12 from Florian Mickler <florian@mickler.org>  2011-01-31 17:55:30 ---
No problem, the regression team is up to a severe game of last man standing :)

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--- Comment #13 from Florian Mickler <florian@mickler.org>  2011-01-31 17:57:09 ---
Ignore-Patch: https://bugzilla.kernel.org/show_bug.cgi?id=27652#c6

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--- Comment #14 from Tao Ma <tm@tao.ma>  2011-02-09 02:01:04 ---
http://marc.info/?l=linux-fsdevel&m=129718595331581&w=2

I have tested this patch and it can resolve this bug. So please close it.
Thanks.

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Florian Mickler <florian@mickler.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |PATCH_ALREADY_AVAILABLE




--- Comment #15 from Florian Mickler <florian@mickler.org>  2011-02-09 04:50:23 ---
Patch: http://marc.info/?l=linux-fsdevel&m=129718595331581&w=2

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[Bug 27652] 38-rc1: umount+rmmod cause ext4 error.

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--- Comment #16 from Rafael J. Wysocki <rjw@sisk.pl>  2011-02-09 09:42:53 ---
Handled-By : Boaz Harrosh <bharrosh@panasas.com>

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Rafael J. Wysocki <rjw@sisk.pl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED
         Resolution|PATCH_ALREADY_AVAILABLE     |CODE_FIX




--- Comment #17 from Rafael J. Wysocki <rjw@sisk.pl>  2011-02-12 22:38:59 ---
Fixed by commit d863b50ab01333659314c2034890cb76d9fdc3c7 .

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[Bug #27652] 38-rc1: umount+rmmod cause ext4 error.

[Rafael J. Wysocki]

This message has been generated automatically as a part of a summary report
of recent regressions.

The following bug entry is on the current list of known regressions
from 2.6.37.  Please verify if it still should be listed and let the tracking team
know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=27652
Subject		: 38-rc1: umount+rmmod cause ext4 error.
Submitter	: Tao Ma <tm@tao.ma>
Date		: 2011-01-19 6:53 (15 days old)
Message-ID	: <4D368A70.5030103@tao.ma>
References	: http://marc.info/?l=linux-ext4&m=129542001031750&w=2

[Bug #27652] 38-rc1: umount+rmmod cause ext4 error.

[Rafael J. Wysocki]

This message has been generated automatically as a part of a summary report
of recent regressions.

The following bug entry is on the current list of known regressions
from 2.6.37.  Please verify if it still should be listed and let the tracking team
know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=27652
Subject		: 38-rc1: umount+rmmod cause ext4 error.
Submitter	: Tao Ma <tm-d1IQDZat3X0@public.gmane.org>
Date		: 2011-01-19 6:53 (15 days old)
Message-ID	: <4D368A70.5030103-d1IQDZat3X0@public.gmane.org>
References	: http://marc.info/?l=linux-ext4&m=129542001031750&w=2