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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hello Sidhartha, Hope you are doing well. I am Chaitanya from the linux graphics team in Int= el. This mail is regarding a regression we are seeing in our CI runs[1] on linu= x-next repository. Since the version next-20240625 [2], we are seeing the following regression ```````````````````````````````````````````````````````````````````````````= `````` <3>[ 2.336948] BUG: sleeping function called from invalid context at inc= lude/linux/sched/mm.h:337 <3>[ 2.336974] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 95= , name: kdevtmpfs <3>[ 2.336989] preempt_count: 1, expected: 0 <3>[ 2.336998] RCU nest depth: 0, expected: 0 <4>[ 2.337006] 3 locks held by kdevtmpfs/95: <4>[ 2.337015] #0: ffff888100d2c3f0 (sb_writers){.+.+}-{0:0}, at: filen= ame_create+0x5d/0x160 <4>[ 2.337041] #1: ffff888100800840 (&type->i_mutex_dir_key/1){+.+.}-{3= :3}, at: filename_create+0x9d/0x160 <4>[ 2.337065] #2: ffff888100800658 (&simple_offset_lock_class){+.+.}-{= 2:2}, at: mtree_alloc_cyclic+0x71/0xf0 <3>[ 2.337089] Preemption disabled at: <3>[ 2.337091] [<0000000000000000>] 0x0 <4>[ 2.337105] CPU: 13 UID: 0 PID: 95 Comm: kdevtmpfs Not tainted 6.10.0= -rc5-next-20240625-next-20240625-g0fc4bfab2cd4+ #1 <4>[ 2.337126] Hardware name: ASUS System Product Name/PRIME Z790-P WIFI= , BIOS 0812 02/24/2023 <4>[ 2.337141] Call Trace: <4>[ 2.337147] <4>[ 2.337152] dump_stack_lvl+0xb0/0xd0 <4>[ 2.337163] __might_resched+0x194/0x2b0 <4>[ 2.337175] kmem_cache_alloc_noprof+0x20c/0x280 <4>[ 2.337186] ? mas_alloc_nodes+0x173/0x230 <4>[ 2.337197] mas_alloc_nodes+0x173/0x230 <4>[ 2.337207] mas_alloc_cyclic+0x27b/0x550 <4>[ 2.337220] mtree_alloc_cyclic+0x92/0xf0 ```````````````````````````````````````````````````````````````````````````= `````` Details log can be found in [3]. After bisecting the tree, the following patch [4] seems to be the first "ba= d" commit ```````````````````````````````````````````````````````````````````````````= `````````````````````````````` maple_tree: remove mas_destroy() from mas_nomem() Separate call to mas_destroy() from mas_nomem() so we can check for no memory errors without destroying the current maple state in mas_store_gfp(). We then add calls to mas_destroy() to callers of mas_nomem(). Link: https://lkml.kernel.org/r/20240618204750.79512-6-sidhartha.kumar@= oracle.com Signed-off-by: Sidhartha Kumar sidhartha.kumar@oracle.com ```````````````````````````````````````````````````````````````````````````= `````````````````````````````` We could not revert the patch because of merge conflicts but resetting to t= he parent of the commit seems to fix the issue. Could you please check why the patch causes this regression and provide a f= ix if necessary? Thank you. Regards Chaitanya [1] https://intel-gfx-ci.01.org/tree/linux-next/combined-alt.html? [2] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/com= mit/?h=3Dnext-20240625 [3] https://intel-gfx-ci.01.org/tree/linux-next/next-20240625/bat-rpls-4/bo= ot0.txt [4] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/com= mit/?id=3D187827d2dc3749d66546696b78584ee4c54687b0 --_000_SJ1PR11MB6129ACCDD516E5C546C7AA94B9D62SJ1PR11MB6129namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hello Sidhartha,

 

Hope you are doing well. I am Chaitanya from the = linux graphics team in Intel.

 

This mail is regarding a regression we are seeing= in our CI runs[1] on linux-next repository.

 

Since the version next-20240625 [2], we are seein= g the following regression

 

`````````````````````````````````````````````````= ````````````````````````````````

<3>[ =    2.336948] BUG: sleeping function called from invalid context a= t include/linux/sched/mm.h:337

<3>[ =    2.336974] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pi= d: 95, name: kdevtmpfs

<3>[ =    2.336989] preempt_count: 1, expected: 0

<3>[ =    2.336998] RCU nest depth: 0, expected: 0

<4>[ =    2.337006] 3 locks held by kdevtmpfs/95:

<4>[ =    2.337015]  #0: ffff888100d2c3f0 (sb_writers){.+.+}-{0:0},= at: filename_create+0x5d/0x160

<4>[ =    2.337041]  #1: ffff888100800840 (&type->i_mutex_di= r_key/1){+.+.}-{3:3}, at: filename_create+0x9d/0x160

<4>[ =    2.337065]  #2: ffff888100800658 (&simple_offset_lock_= class){+.+.}-{2:2}, at: mtree_alloc_cyclic+0x71/0xf0

<3>[ =    2.337089] Preemption disabled at:

<3>[ =    2.337091] [<0000000000000000>] 0x0

<4>[ =    2.337105] CPU: 13 UID: 0 PID: 95 Comm: kdevtmpfs Not tainted 6= .10.0-rc5-next-20240625-next-20240625-g0fc4bfab2cd4+ #1

<4>[ =    2.337126] Hardware name: ASUS System Product Name/PRIME Z790-P= WIFI, BIOS 0812 02/24/2023

<4>[ =    2.337141] Call Trace:

<4>[ =    2.337147]  <TASK>

<4>[ =    2.337152]  dump_stack_lvl+0xb0/0xd0

<4>[ =    2.337163]  __might_resched+0x194/0x2b0<= /p>

<4>[ =    2.337175]  kmem_cache_alloc_noprof+0x20c/0x280=

<4>[ =    2.337186]  ? mas_alloc_nodes+0x173/0x230

<4>[ =    2.337197]  mas_alloc_nodes+0x173/0x230<= /p>

<4>[ =    2.337207]  mas_alloc_cyclic+0x27b/0x550=

<4>[ =    2.337220]  mtree_alloc_cyclic+0x92/0xf0=

`````````````````````````````````````````````````= ````````````````````````````````

Details log can be found in [3].

 

After bisecting the tree, the following patch [4]= seems to be the first "bad"

commit

 

`````````````````````````````````````````````````= ````````````````````````````````````````````````````````

    maple_tree: remove mas_destroy() = from mas_nomem()

 

    Separate call to mas_destroy() fr= om mas_nomem() so we can check for no

    memory errors without destroying = the current maple state in

    mas_store_gfp().  We then ad= d calls to mas_destroy() to callers of

    mas_nomem().

 

    Link: https://lkml.kernel.org/r/20240618204750.79512-6-sidhartha.kumar@oracle.com=

    Signed-off-by: Sidhartha Kumar sidhartha.kumar@oracle.com

 

`````````````````````````````````````````````````= ````````````````````````````````````````````````````````

 

We could not revert the patch because of merge co= nflicts but resetting to the parent of the commit seems to fix the issue.

 

Could you please check why the patch causes this = regression and provide a fix if necessary?

 

Thank you.

 

Regards

 

Chaitanya

 

[1] https://intel-gfx-ci.01.org/tree/linux-next/combined-alt.html?

[2] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next= .git/commit/?h=3Dnext-20240625

[3] htt= ps://intel-gfx-ci.01.org/tree/linux-next/next-20240625/bat-rpls-4/boot0.txt=

[4] https://git.kernel.org/pub/scm/linu= x/kernel/git/next/linux-next.git/commit/?id=3D187827d2dc3749d66546696b78584= ee4c54687b0

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