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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-20250814 [2], we are seeing the following regression ````````````````````````````````````````````````````````````````````````````````` <4>[ 25.645493] ====================================================== <4>[ 25.645497] WARNING: possible circular locking dependency detected <5>[ 25.645501] 6.17.0-rc2-next-20250818-next-20250818-g3ac864c2d9bb+ #1 Not tainted <4>[ 25.645506] ------------------------------------------------------ <4>[ 25.645509] swapper/0/1 is trying to acquire lock: <5>[ 25.645513] ffffffff83488270 (cpu_hotplug_lock){++++}-{0:0}, at: static_key_slow_inc+0x12/0x30 <4>[ 25.645526] but task is already holding lock: <5>[ 25.645529] ffff8881063fce30 (&q->q_usage_counter(io)){++++}-{0:0}, at: blk_mq_freeze_queue_nomemsave+0x12/0x30 <4>[ 25.645540] which lock already depends on the new lock. <4>[ 25.645545] the existing dependency chain (in reverse order) is: <5>[ 25.645549] -> #2 (&q->q_usage_counter(io)){++++}-{0:0}: <5>[ 25.645554] blk_alloc_queue+0x324/0x360 <5>[ 25.645560] blk_mq_alloc_queue+0x6a/0xe0 <5>[ 25.645564] __blk_mq_alloc_disk+0x19/0x70 <5>[ 25.645567] loop_add+0x240/0x430 <5>[ 25.645573] loop_init+0xcd/0x190 <5>[ 25.645576] do_one_initcall+0x5d/0x3f0 <5>[ 25.645581] kernel_init_freeable+0x3cd/0x6a0 <5>[ 25.645586] kernel_init+0x1b/0x200 <5>[ 25.645591] ret_from_fork+0x26c/0x2e0 <5>[ 25.645597] ret_from_fork_asm+0x1a/0x30 ````````````````````````````````````````````````````````````````````````````````` Details log can be found in [3]. After bisecting the tree, the following patch [4] seems to be the first "bad" commit ````````````````````````````````````````````````````````````````````````````````````````````````````````` commit 8f5845e0743bf3512b71b3cb8afe06c192d6acc4 Author: Julian Sun sunjunchao2870@gmail.com Date: Tue Aug 12 23:42:57 2025 +0800 block: restore default wbt enablement ````````````````````````````````````````````````````````````````````````````````````````````````````````` We also verified that if we revert the patch the issue is not seen. 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=next-20250814 [3] https://intel-gfx-ci.01.org/tree/linux-next/next-20250818/bat-twl-1/boot0.txt [4] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?h=next-20250818&id=8f5845e0743bf3512b71b3cb8afe06c192d6acc4