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* FAILED: patch "[PATCH] bcache: Revert "bcache: use sysfs_match_string() instead of" failed to apply to 5.2-stable tree
@ 2019-08-11 15:01 gregkh
  2019-08-11 15:41 ` Coly Li
  0 siblings, 1 reply; 5+ messages in thread
From: gregkh @ 2019-08-11 15:01 UTC (permalink / raw)
  To: colyli, alexandru.ardelean, axboe, pflin; +Cc: stable


The patch below does not apply to the 5.2-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 20621fedb2a696e4dc60bc1c5de37cf21976abcb Mon Sep 17 00:00:00 2001
From: Coly Li <colyli@suse.de>
Date: Fri, 9 Aug 2019 14:14:05 +0800
Subject: [PATCH] bcache: Revert "bcache: use sysfs_match_string() instead of
 __sysfs_match_string()"

This reverts commit 89e0341af082dbc170019f908846f4a424efc86b.

In drivers/md/bcache/sysfs.c:bch_snprint_string_list(), NULL pointer at
the end of list is necessary. Remove the NULL from last element of each
lists will cause the following panic,

[ 4340.455652] bcache: register_cache() registered cache device nvme0n1
[ 4340.464603] bcache: register_bdev() registered backing device sdk
[ 4421.587335] bcache: bch_cached_dev_run() cached dev sdk is running already
[ 4421.587348] bcache: bch_cached_dev_attach() Caching sdk as bcache0 on set 354e1d46-d99f-4d8b-870b-078b80dc88a6
[ 5139.247950] general protection fault: 0000 [#1] SMP NOPTI
[ 5139.247970] CPU: 9 PID: 5896 Comm: cat Not tainted 4.12.14-95.29-default #1 SLE12-SP4
[ 5139.247988] Hardware name: HPE ProLiant DL380 Gen10/ProLiant DL380 Gen10, BIOS U30 04/18/2019
[ 5139.248006] task: ffff888fb25c0b00 task.stack: ffff9bbacc704000
[ 5139.248021] RIP: 0010:string+0x21/0x70
[ 5139.248030] RSP: 0018:ffff9bbacc707bf0 EFLAGS: 00010286
[ 5139.248043] RAX: ffffffffa7e432e3 RBX: ffff8881c20da02a RCX: ffff0a00ffffff04
[ 5139.248058] RDX: 3f00656863616362 RSI: ffff8881c20db000 RDI: ffffffffffffffff
[ 5139.248075] RBP: ffff8881c20db000 R08: 0000000000000000 R09: ffff8881c20da02a
[ 5139.248090] R10: 0000000000000004 R11: 0000000000000000 R12: ffff9bbacc707c48
[ 5139.248104] R13: 0000000000000fd6 R14: ffffffffc0665855 R15: ffffffffc0665855
[ 5139.248119] FS:  00007faf253b8700(0000) GS:ffff88903f840000(0000) knlGS:0000000000000000
[ 5139.248137] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 5139.248149] CR2: 00007faf25395008 CR3: 0000000f72150006 CR4: 00000000007606e0
[ 5139.248164] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 5139.248179] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 5139.248193] PKRU: 55555554
[ 5139.248200] Call Trace:
[ 5139.248210]  vsnprintf+0x1fb/0x510
[ 5139.248221]  snprintf+0x39/0x40
[ 5139.248238]  bch_snprint_string_list.constprop.15+0x5b/0x90 [bcache]
[ 5139.248256]  __bch_cached_dev_show+0x44d/0x5f0 [bcache]
[ 5139.248270]  ? __alloc_pages_nodemask+0xb2/0x210
[ 5139.248284]  bch_cached_dev_show+0x2c/0x50 [bcache]
[ 5139.248297]  sysfs_kf_seq_show+0xbb/0x190
[ 5139.248308]  seq_read+0xfc/0x3c0
[ 5139.248317]  __vfs_read+0x26/0x140
[ 5139.248327]  vfs_read+0x87/0x130
[ 5139.248336]  SyS_read+0x42/0x90
[ 5139.248346]  do_syscall_64+0x74/0x160
[ 5139.248358]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[ 5139.248370] RIP: 0033:0x7faf24eea370
[ 5139.248379] RSP: 002b:00007fff82d03f38 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[ 5139.248395] RAX: ffffffffffffffda RBX: 0000000000020000 RCX: 00007faf24eea370
[ 5139.248411] RDX: 0000000000020000 RSI: 00007faf25396000 RDI: 0000000000000003
[ 5139.248426] RBP: 00007faf25396000 R08: 00000000ffffffff R09: 0000000000000000
[ 5139.248441] R10: 000000007c9d4d41 R11: 0000000000000246 R12: 00007faf25396000
[ 5139.248456] R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000fff
[ 5139.248892] Code: ff ff ff 0f 1f 80 00 00 00 00 49 89 f9 48 89 cf 48 c7 c0 e3 32 e4 a7 48 c1 ff 30 48 81 fa ff 0f 00 00 48 0f 46 d0 48 85 ff 74 45 <44> 0f b6 02 48 8d 42 01 45 84 c0 74 38 48 01 fa 4c 89 cf eb 0e

The simplest way to fix is to revert commit 89e0341af082 ("bcache: use
sysfs_match_string() instead of __sysfs_match_string()").

This bug was introduced in Linux v5.2, so this fix only applies to
Linux v5.2 is enough for stable tree maintainer.

Fixes: 89e0341af082 ("bcache: use sysfs_match_string() instead of __sysfs_match_string()")
Cc: stable@vger.kernel.org
Cc: Alexandru Ardelean <alexandru.ardelean@analog.com>
Reported-by: Peifeng Lin <pflin@suse.com>
Acked-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index 9f0826712845..e2059af90791 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -23,24 +23,28 @@ static const char * const bch_cache_modes[] = {
 	"writethrough",
 	"writeback",
 	"writearound",
-	"none"
+	"none",
+	NULL
 };
 
 /* Default is 0 ("auto") */
 static const char * const bch_stop_on_failure_modes[] = {
 	"auto",
-	"always"
+	"always",
+	NULL
 };
 
 static const char * const cache_replacement_policies[] = {
 	"lru",
 	"fifo",
-	"random"
+	"random",
+	NULL
 };
 
 static const char * const error_actions[] = {
 	"unregister",
-	"panic"
+	"panic",
+	NULL
 };
 
 write_attribute(attach);
@@ -338,7 +342,7 @@ STORE(__cached_dev)
 	}
 
 	if (attr == &sysfs_cache_mode) {
-		v = sysfs_match_string(bch_cache_modes, buf);
+		v = __sysfs_match_string(bch_cache_modes, -1, buf);
 		if (v < 0)
 			return v;
 
@@ -349,7 +353,7 @@ STORE(__cached_dev)
 	}
 
 	if (attr == &sysfs_stop_when_cache_set_failed) {
-		v = sysfs_match_string(bch_stop_on_failure_modes, buf);
+		v = __sysfs_match_string(bch_stop_on_failure_modes, -1, buf);
 		if (v < 0)
 			return v;
 
@@ -816,7 +820,7 @@ STORE(__bch_cache_set)
 			    0, UINT_MAX);
 
 	if (attr == &sysfs_errors) {
-		v = sysfs_match_string(error_actions, buf);
+		v = __sysfs_match_string(error_actions, -1, buf);
 		if (v < 0)
 			return v;
 
@@ -1088,7 +1092,7 @@ STORE(__bch_cache)
 	}
 
 	if (attr == &sysfs_cache_replacement_policy) {
-		v = sysfs_match_string(cache_replacement_policies, buf);
+		v = __sysfs_match_string(cache_replacement_policies, -1, buf);
 		if (v < 0)
 			return v;
 


^ permalink raw reply related	[flat|nested] 5+ messages in thread
* Re: FAILED: patch "[PATCH] bcache: Revert "bcache: use sysfs_match_string() instead of" failed to apply to 5.2-stable tree
  2019-08-11 15:01 FAILED: patch "[PATCH] bcache: Revert "bcache: use sysfs_match_string() instead of" failed to apply to 5.2-stable tree gregkh
@ 2019-08-11 15:41 ` Coly Li
  2019-08-11 16:09   ` Greg KH
  0 siblings, 1 reply; 5+ messages in thread
From: Coly Li @ 2019-08-11 15:41 UTC (permalink / raw)
  To: gregkh; +Cc: alexandru.ardelean, axboe, pflin, stable

On 2019/8/11 11:01 下午, gregkh@linuxfoundation.org wrote:
> 
> The patch below does not apply to the 5.2-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@vger.kernel.org>.
> 
> thanks,
> 
> greg k-h

Hi Greg,

I will post a rebased patch for the 5.2-stable tree.

Thanks.


Coly Li


> 
> ------------------ original commit in Linus's tree ------------------
> 
> From 20621fedb2a696e4dc60bc1c5de37cf21976abcb Mon Sep 17 00:00:00 2001
> From: Coly Li <colyli@suse.de>
> Date: Fri, 9 Aug 2019 14:14:05 +0800
> Subject: [PATCH] bcache: Revert "bcache: use sysfs_match_string() instead of
>  __sysfs_match_string()"
> 
> This reverts commit 89e0341af082dbc170019f908846f4a424efc86b.
> 
> In drivers/md/bcache/sysfs.c:bch_snprint_string_list(), NULL pointer at
> the end of list is necessary. Remove the NULL from last element of each
> lists will cause the following panic,
> 
> [ 4340.455652] bcache: register_cache() registered cache device nvme0n1
> [ 4340.464603] bcache: register_bdev() registered backing device sdk
> [ 4421.587335] bcache: bch_cached_dev_run() cached dev sdk is running already
> [ 4421.587348] bcache: bch_cached_dev_attach() Caching sdk as bcache0 on set 354e1d46-d99f-4d8b-870b-078b80dc88a6
> [ 5139.247950] general protection fault: 0000 [#1] SMP NOPTI
> [ 5139.247970] CPU: 9 PID: 5896 Comm: cat Not tainted 4.12.14-95.29-default #1 SLE12-SP4
> [ 5139.247988] Hardware name: HPE ProLiant DL380 Gen10/ProLiant DL380 Gen10, BIOS U30 04/18/2019
> [ 5139.248006] task: ffff888fb25c0b00 task.stack: ffff9bbacc704000
> [ 5139.248021] RIP: 0010:string+0x21/0x70
> [ 5139.248030] RSP: 0018:ffff9bbacc707bf0 EFLAGS: 00010286
> [ 5139.248043] RAX: ffffffffa7e432e3 RBX: ffff8881c20da02a RCX: ffff0a00ffffff04
> [ 5139.248058] RDX: 3f00656863616362 RSI: ffff8881c20db000 RDI: ffffffffffffffff
> [ 5139.248075] RBP: ffff8881c20db000 R08: 0000000000000000 R09: ffff8881c20da02a
> [ 5139.248090] R10: 0000000000000004 R11: 0000000000000000 R12: ffff9bbacc707c48
> [ 5139.248104] R13: 0000000000000fd6 R14: ffffffffc0665855 R15: ffffffffc0665855
> [ 5139.248119] FS:  00007faf253b8700(0000) GS:ffff88903f840000(0000) knlGS:0000000000000000
> [ 5139.248137] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 5139.248149] CR2: 00007faf25395008 CR3: 0000000f72150006 CR4: 00000000007606e0
> [ 5139.248164] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 5139.248179] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 5139.248193] PKRU: 55555554
> [ 5139.248200] Call Trace:
> [ 5139.248210]  vsnprintf+0x1fb/0x510
> [ 5139.248221]  snprintf+0x39/0x40
> [ 5139.248238]  bch_snprint_string_list.constprop.15+0x5b/0x90 [bcache]
> [ 5139.248256]  __bch_cached_dev_show+0x44d/0x5f0 [bcache]
> [ 5139.248270]  ? __alloc_pages_nodemask+0xb2/0x210
> [ 5139.248284]  bch_cached_dev_show+0x2c/0x50 [bcache]
> [ 5139.248297]  sysfs_kf_seq_show+0xbb/0x190
> [ 5139.248308]  seq_read+0xfc/0x3c0
> [ 5139.248317]  __vfs_read+0x26/0x140
> [ 5139.248327]  vfs_read+0x87/0x130
> [ 5139.248336]  SyS_read+0x42/0x90
> [ 5139.248346]  do_syscall_64+0x74/0x160
> [ 5139.248358]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
> [ 5139.248370] RIP: 0033:0x7faf24eea370
> [ 5139.248379] RSP: 002b:00007fff82d03f38 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
> [ 5139.248395] RAX: ffffffffffffffda RBX: 0000000000020000 RCX: 00007faf24eea370
> [ 5139.248411] RDX: 0000000000020000 RSI: 00007faf25396000 RDI: 0000000000000003
> [ 5139.248426] RBP: 00007faf25396000 R08: 00000000ffffffff R09: 0000000000000000
> [ 5139.248441] R10: 000000007c9d4d41 R11: 0000000000000246 R12: 00007faf25396000
> [ 5139.248456] R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000fff
> [ 5139.248892] Code: ff ff ff 0f 1f 80 00 00 00 00 49 89 f9 48 89 cf 48 c7 c0 e3 32 e4 a7 48 c1 ff 30 48 81 fa ff 0f 00 00 48 0f 46 d0 48 85 ff 74 45 <44> 0f b6 02 48 8d 42 01 45 84 c0 74 38 48 01 fa 4c 89 cf eb 0e
> 
> The simplest way to fix is to revert commit 89e0341af082 ("bcache: use
> sysfs_match_string() instead of __sysfs_match_string()").
> 
> This bug was introduced in Linux v5.2, so this fix only applies to
> Linux v5.2 is enough for stable tree maintainer.
> 
> Fixes: 89e0341af082 ("bcache: use sysfs_match_string() instead of __sysfs_match_string()")
> Cc: stable@vger.kernel.org
> Cc: Alexandru Ardelean <alexandru.ardelean@analog.com>
> Reported-by: Peifeng Lin <pflin@suse.com>
> Acked-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
> Signed-off-by: Coly Li <colyli@suse.de>
> Signed-off-by: Jens Axboe <axboe@kernel.dk>
> 
> diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
> index 9f0826712845..e2059af90791 100644
> --- a/drivers/md/bcache/sysfs.c
> +++ b/drivers/md/bcache/sysfs.c
> @@ -23,24 +23,28 @@ static const char * const bch_cache_modes[] = {
>  	"writethrough",
>  	"writeback",
>  	"writearound",
> -	"none"
> +	"none",
> +	NULL
>  };
>  
>  /* Default is 0 ("auto") */
>  static const char * const bch_stop_on_failure_modes[] = {
>  	"auto",
> -	"always"
> +	"always",
> +	NULL
>  };
>  
>  static const char * const cache_replacement_policies[] = {
>  	"lru",
>  	"fifo",
> -	"random"
> +	"random",
> +	NULL
>  };
>  
>  static const char * const error_actions[] = {
>  	"unregister",
> -	"panic"
> +	"panic",
> +	NULL
>  };
>  
>  write_attribute(attach);
> @@ -338,7 +342,7 @@ STORE(__cached_dev)
>  	}
>  
>  	if (attr == &sysfs_cache_mode) {
> -		v = sysfs_match_string(bch_cache_modes, buf);
> +		v = __sysfs_match_string(bch_cache_modes, -1, buf);
>  		if (v < 0)
>  			return v;
>  
> @@ -349,7 +353,7 @@ STORE(__cached_dev)
>  	}
>  
>  	if (attr == &sysfs_stop_when_cache_set_failed) {
> -		v = sysfs_match_string(bch_stop_on_failure_modes, buf);
> +		v = __sysfs_match_string(bch_stop_on_failure_modes, -1, buf);
>  		if (v < 0)
>  			return v;
>  
> @@ -816,7 +820,7 @@ STORE(__bch_cache_set)
>  			    0, UINT_MAX);
>  
>  	if (attr == &sysfs_errors) {
> -		v = sysfs_match_string(error_actions, buf);
> +		v = __sysfs_match_string(error_actions, -1, buf);
>  		if (v < 0)
>  			return v;
>  
> @@ -1088,7 +1092,7 @@ STORE(__bch_cache)
>  	}
>  
>  	if (attr == &sysfs_cache_replacement_policy) {
> -		v = sysfs_match_string(cache_replacement_policies, buf);
> +		v = __sysfs_match_string(cache_replacement_policies, -1, buf);
>  		if (v < 0)
>  			return v;
>  
> 

^ permalink raw reply	[flat|nested] 5+ messages in thread
* Re: FAILED: patch "[PATCH] bcache: Revert "bcache: use sysfs_match_string() instead of" failed to apply to 5.2-stable tree
  2019-08-11 15:41 ` Coly Li
@ 2019-08-11 16:09   ` Greg KH
  2019-08-12  5:04     ` Coly Li
  0 siblings, 1 reply; 5+ messages in thread
From: Greg KH @ 2019-08-11 16:09 UTC (permalink / raw)
  To: Coly Li; +Cc: alexandru.ardelean, axboe, pflin, stable

On Sun, Aug 11, 2019 at 11:41:57PM +0800, Coly Li wrote:
> On 2019/8/11 11:01 下午, gregkh@linuxfoundation.org wrote:
> > 
> > The patch below does not apply to the 5.2-stable tree.
> > If someone wants it applied there, or to any other stable or longterm
> > tree, then please email the backport, including the original git commit
> > id to <stable@vger.kernel.org>.
> > 
> > thanks,
> > 
> > greg k-h
> 
> Hi Greg,
> 
> I will post a rebased patch for the 5.2-stable tree.

Is it really needed?

I ask because in the patch it says:

> > This bug was introduced in Linux v5.2, so this fix only applies to
> > Linux v5.2 is enough for stable tree maintainer.
> > 
> > Fixes: 89e0341af082 ("bcache: use sysfs_match_string() instead of __sysfs_match_string()")

But commit 89e0341af082 showed up in 5.3-rc1, not 5.2.

So why is this needed in 5.2.y?

thanks,

greg k-h

^ permalink raw reply	[flat|nested] 5+ messages in thread
* Re: FAILED: patch "[PATCH] bcache: Revert "bcache: use sysfs_match_string() instead of" failed to apply to 5.2-stable tree
  2019-08-11 16:09   ` Greg KH
@ 2019-08-12  5:04     ` Coly Li
  2019-08-12  5:27       ` Greg KH
  0 siblings, 1 reply; 5+ messages in thread
From: Coly Li @ 2019-08-12  5:04 UTC (permalink / raw)
  To: Greg KH; +Cc: alexandru.ardelean, axboe, pflin, stable

On 2019/8/12 12:09 上午, Greg KH wrote:
> On Sun, Aug 11, 2019 at 11:41:57PM +0800, Coly Li wrote:
>> On 2019/8/11 11:01 下午, gregkh@linuxfoundation.org wrote:
>>>
>>> The patch below does not apply to the 5.2-stable tree.
>>> If someone wants it applied there, or to any other stable or longterm
>>> tree, then please email the backport, including the original git commit
>>> id to <stable@vger.kernel.org>.
>>>
>>> thanks,
>>>
>>> greg k-h
>>
>> Hi Greg,
>>
>> I will post a rebased patch for the 5.2-stable tree.
> 
> Is it really needed?
> 
> I ask because in the patch it says:
> 
>>> This bug was introduced in Linux v5.2, so this fix only applies to
>>> Linux v5.2 is enough for stable tree maintainer.
>>>
>>> Fixes: 89e0341af082 ("bcache: use sysfs_match_string() instead of __sysfs_match_string()")

Hi Greg,

> 
> But commit 89e0341af082 showed up in 5.3-rc1, not 5.2.
> 
> So why is this needed in 5.2.y?

Indeed I was not sure which version this patch was merged, so I ran,
> git describe 89e0341af082
v5.2-rc4-245-g89e0341af082

It seems I use git in an incorrect way. After check man git-describe I
see '--contains' should be added (to find a tag which after/contains the
commit),
> git describe --contains 89e0341af082
v5.3-rc1~164^2~57

Yes, the fixing bug is from v5.3-rc1. Please ignore the noise....

Thanks.

-- 

Coly Li

^ permalink raw reply	[flat|nested] 5+ messages in thread
* Re: FAILED: patch "[PATCH] bcache: Revert "bcache: use sysfs_match_string() instead of" failed to apply to 5.2-stable tree
  2019-08-12  5:04     ` Coly Li
@ 2019-08-12  5:27       ` Greg KH
  0 siblings, 0 replies; 5+ messages in thread
From: Greg KH @ 2019-08-12  5:27 UTC (permalink / raw)
  To: Coly Li; +Cc: alexandru.ardelean, axboe, pflin, stable

On Mon, Aug 12, 2019 at 01:04:24PM +0800, Coly Li wrote:
> On 2019/8/12 12:09 上午, Greg KH wrote:
> > On Sun, Aug 11, 2019 at 11:41:57PM +0800, Coly Li wrote:
> >> On 2019/8/11 11:01 下午, gregkh@linuxfoundation.org wrote:
> >>>
> >>> The patch below does not apply to the 5.2-stable tree.
> >>> If someone wants it applied there, or to any other stable or longterm
> >>> tree, then please email the backport, including the original git commit
> >>> id to <stable@vger.kernel.org>.
> >>>
> >>> thanks,
> >>>
> >>> greg k-h
> >>
> >> Hi Greg,
> >>
> >> I will post a rebased patch for the 5.2-stable tree.
> > 
> > Is it really needed?
> > 
> > I ask because in the patch it says:
> > 
> >>> This bug was introduced in Linux v5.2, so this fix only applies to
> >>> Linux v5.2 is enough for stable tree maintainer.
> >>>
> >>> Fixes: 89e0341af082 ("bcache: use sysfs_match_string() instead of __sysfs_match_string()")
> 
> Hi Greg,
> 
> > 
> > But commit 89e0341af082 showed up in 5.3-rc1, not 5.2.
> > 
> > So why is this needed in 5.2.y?
> 
> Indeed I was not sure which version this patch was merged, so I ran,
> > git describe 89e0341af082
> v5.2-rc4-245-g89e0341af082
> 
> It seems I use git in an incorrect way. After check man git-describe I
> see '--contains' should be added (to find a tag which after/contains the
> commit),
> > git describe --contains 89e0341af082
> v5.3-rc1~164^2~57
> 
> Yes, the fixing bug is from v5.3-rc1. Please ignore the noise....

No problem, thanks for the confirmation.

greg k-h

^ permalink raw reply	[flat|nested] 5+ messages in thread
end of thread, other threads:[~2019-08-12  5:27 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-08-11 15:01 FAILED: patch "[PATCH] bcache: Revert "bcache: use sysfs_match_string() instead of" failed to apply to 5.2-stable tree gregkh
2019-08-11 15:41 ` Coly Li
2019-08-11 16:09   ` Greg KH
2019-08-12  5:04     ` Coly Li
2019-08-12  5:27       ` Greg KH

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