From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f72.google.com (mail-oo1-f72.google.com [209.85.161.72]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 473153E8C70 for ; Thu, 26 Feb 2026 15:05:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.72 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772118329; cv=none; b=lm0wMMguQbJR5sIaxP6Gi8urbyp68kLxqxgPC38wFdk+13UNgMLzwprg4UuYfMcLiLuOjQ0taM/eVzryaGhqsomdzcw4/RcWW8Azrf3Zw66VIJaHSLPgjFqbxrjPjCAmuhZKvx87yGEvvE9DAm/wLJmvF3bFBCWDqLDG2DuS6FI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772118329; c=relaxed/simple; bh=y7+kfGp/RJno7FbTmPFqXkd2TGEO5Nfwjs8ZlFh6hcw=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=n3PQ+SMBnr4TRQRhBgphYDSeMiqcsyr7ZzyGoOSeiJmbWABMThCSi3nUogECgbsP0gqkuuUMxUifhJOYREWpLFnW2yPWTVxkUsNU9b1hsovVy6FF6cyKW4Vce2RTnBgvlgcZYOU89PTS+lMmZSyTV1HcL3xl+QBgcGZiGItLsU4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.161.72 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oo1-f72.google.com with SMTP id 006d021491bc7-679deba5e9fso8249989eaf.0 for ; Thu, 26 Feb 2026 07:05:27 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1772118326; x=1772723126; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=zmDYSkk6amWrHsgLmDE145+Yj0Kcw8ZGMbR6kx/n19I=; b=FycYorzDSWFS3RI5+H3supJhG87pfEjQL4GpiDmkYSa237vWPk3OHghSHOIECcJEw0 Zw6fTObMpMA2XwTVMPaRv9BsPxnmMw9FnszfKdkMFaQL4ZQKiGJIDn3xotiKsgQVj+rB /swEq5wfkIO7YTD6Q4ksn4eXtP2YhXIDTB6RBreBmx9yD6LRmzjJd1Ei0ovjcCYYpYRo f926tPltckW3EvNN0QCjhl0vAJw+x/UPbiIObmFbcQl5NHppl1FhO6rPwXyShllnc0i5 P+wanqPjl92aQ+OBEv2khAAKZu2gUGm6g0GPB7vKyF812QtqZPYRAO1ucFEwzUHowUy5 mq2Q== X-Forwarded-Encrypted: i=1; AJvYcCX6DKc6vhKklk/JBN33W2GGIU9BqVaNFddWXOYsBeh6ck9+tvjgl2ta6XnJVrPGFvqiiqvKowBd8YWeJ/4=@vger.kernel.org X-Gm-Message-State: AOJu0YwTOW9xNCoNhgSf0U8Au/SE62GgFa0DyM488qA9I2IfuHN2i4P8 qhB3bM7Io7G3PPh5wnl6Z9gjT/yxVeyz3tPhSH2xi6FvLn6NYOMXL5JY5z0F+BOxAaMaVqU0ECV sQ2kEx6YxMq+RgkcRLXpGGiBW/z1ot2Xis1IJp3mVlyWlwdC0QBzx9oUxbxk= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:6ac1:b0:679:f37c:f995 with SMTP id 006d021491bc7-679f3d79437mr1157767eaf.37.1772118325826; Thu, 26 Feb 2026 07:05:25 -0800 (PST) Date: Thu, 26 Feb 2026 07:05:25 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69a06135.050a0220.305b49.0024.GAE@google.com> Subject: [syzbot] [arm?] BUG: using __this_cpu_read() in preemptible code in __delay From: syzbot To: catalin.marinas@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, will@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 32a92f8c8932 Convert more 'alloc_obj' cases to default GFP.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1019fc02580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b77d736d2f4fe1b1 dashboard link: https://syzkaller.appspot.com/bug?extid=b29d18a34746f34c94cc compiler: aarch64-linux-gnu-gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/fa3fbcfdac58/non_bootable_disk-32a92f8c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/aabf4d7d9d6a/vmlinux-32a92f8c.xz kernel image: https://storage.googleapis.com/syzbot-assets/0367e274b699/Image-32a92f8c.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b29d18a34746f34c94cc@syzkaller.appspotmail.com BUG: using __this_cpu_read() in preemptible [00000000] code: syz.0.1012/5537 caller is __this_cpu_preempt_check+0x20/0x40 lib/smp_processor_id.c:64 CPU: 0 UID: 0 PID: 5537 Comm: syz.0.1012 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: linux,dummy-virt (DT) Call trace: show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x7c/0xb0 lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 check_preemption_disabled+0xe0/0xe8 lib/smp_processor_id.c:47 __this_cpu_preempt_check+0x20/0x40 lib/smp_processor_id.c:64 __arch_counter_get_cntvct_stable arch/arm64/include/asm/arch_timer.h:195 [inline] __delay+0x40/0x374 arch/arm64/lib/delay.c:39 __const_udelay+0x48/0x64 arch/arm64/lib/delay.c:66 udelay include/asm-generic/delay.h:62 [inline] snd_timer_close_locked+0x258/0x94c sound/core/timer.c:443 snd_timer_close+0xa4/0x120 sound/core/timer.c:476 snd_seq_timer_close+0x88/0xd0 sound/core/seq/seq_timer.c:311 queue_delete+0x50/0xac sound/core/seq/seq_queue.c:126 snd_seq_queue_delete+0x2c/0x58 sound/core/seq/seq_queue.c:188 snd_seq_ioctl_delete_queue+0x6c/0xa0 sound/core/seq/seq_clientmgr.c:1546 call_seq_client_ctl+0x94/0x120 sound/core/seq/seq_clientmgr.c:2419 snd_seq_kernel_client_ctl+0x68/0x100 sound/core/seq/seq_clientmgr.c:2447 delete_seq_queue.isra.0+0xbc/0x124 sound/core/seq/oss/seq_oss_init.c:371 snd_seq_oss_release+0x13c/0x1a0 sound/core/seq/oss/seq_oss_init.c:416 odev_release+0x4c/0x88 sound/core/seq/oss/seq_oss.c:141 __fput+0x2d0/0x958 fs/file_table.c:469 ____fput+0x14/0x20 fs/file_table.c:497 task_work_run+0x134/0x238 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] exit_to_user_mode_loop+0x194/0x1c8 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] exit_to_user_mode_prepare_legacy include/linux/irq-entry-common.h:242 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline] el0_svc+0x258/0x29c arch/arm64/kernel/entry-common.c:725 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 BUG: using __this_cpu_read() in preemptible [00000000] code: syz.0.1012/5537 caller is __this_cpu_preempt_check+0x20/0x40 lib/smp_processor_id.c:64 CPU: 0 UID: 0 PID: 5537 Comm: syz.0.1012 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: linux,dummy-virt (DT) Call trace: show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x7c/0xb0 lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 check_preemption_disabled+0xe0/0xe8 lib/smp_processor_id.c:47 __this_cpu_preempt_check+0x20/0x40 lib/smp_processor_id.c:64 __arch_counter_get_cntvct_stable arch/arm64/include/asm/arch_timer.h:195 [inline] __delay+0x10c/0x374 arch/arm64/lib/delay.c:55 __const_udelay+0x48/0x64 arch/arm64/lib/delay.c:66 udelay include/asm-generic/delay.h:62 [inline] snd_timer_close_locked+0x258/0x94c sound/core/timer.c:443 snd_timer_close+0xa4/0x120 sound/core/timer.c:476 snd_seq_timer_close+0x88/0xd0 sound/core/seq/seq_timer.c:311 queue_delete+0x50/0xac sound/core/seq/seq_queue.c:126 snd_seq_queue_delete+0x2c/0x58 sound/core/seq/seq_queue.c:188 snd_seq_ioctl_delete_queue+0x6c/0xa0 sound/core/seq/seq_clientmgr.c:1546 call_seq_client_ctl+0x94/0x120 sound/core/seq/seq_clientmgr.c:2419 snd_seq_kernel_client_ctl+0x68/0x100 sound/core/seq/seq_clientmgr.c:2447 delete_seq_queue.isra.0+0xbc/0x124 sound/core/seq/oss/seq_oss_init.c:371 snd_seq_oss_release+0x13c/0x1a0 sound/core/seq/oss/seq_oss_init.c:416 odev_release+0x4c/0x88 sound/core/seq/oss/seq_oss.c:141 __fput+0x2d0/0x958 fs/file_table.c:469 ____fput+0x14/0x20 fs/file_table.c:497 task_work_run+0x134/0x238 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] exit_to_user_mode_loop+0x194/0x1c8 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] exit_to_user_mode_prepare_legacy include/linux/irq-entry-common.h:242 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline] el0_svc+0x258/0x29c arch/arm64/kernel/entry-common.c:725 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 BUG: using __this_cpu_read() in preemptible [00000000] code: syz.0.1012/5537 caller is __this_cpu_preempt_check+0x20/0x40 lib/smp_processor_id.c:64 CPU: 0 UID: 0 PID: 5537 Comm: syz.0.1012 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: linux,dummy-virt (DT) Call trace: show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x7c/0xb0 lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 check_preemption_disabled+0xe0/0xe8 lib/smp_processor_id.c:47 __this_cpu_preempt_check+0x20/0x40 lib/smp_processor_id.c:64 __arch_counter_get_cntvct_stable arch/arm64/include/asm/arch_timer.h:195 [inline] __delay+0x19c/0x374 arch/arm64/lib/delay.c:59 __const_udelay+0x48/0x64 arch/arm64/lib/delay.c:66 udelay include/asm-generic/delay.h:62 [inline] snd_timer_close_locked+0x258/0x94c sound/core/timer.c:443 snd_timer_close+0xa4/0x120 sound/core/timer.c:476 snd_seq_timer_close+0x88/0xd0 sound/core/seq/seq_timer.c:311 queue_delete+0x50/0xac sound/core/seq/seq_queue.c:126 snd_seq_queue_delete+0x2c/0x58 sound/core/seq/seq_queue.c:188 snd_seq_ioctl_delete_queue+0x6c/0xa0 sound/core/seq/seq_clientmgr.c:1546 call_seq_client_ctl+0x94/0x120 sound/core/seq/seq_clientmgr.c:2419 snd_seq_kernel_client_ctl+0x68/0x100 sound/core/seq/seq_clientmgr.c:2447 delete_seq_queue.isra.0+0xbc/0x124 sound/core/seq/oss/seq_oss_init.c:371 snd_seq_oss_release+0x13c/0x1a0 sound/core/seq/oss/seq_oss_init.c:416 odev_release+0x4c/0x88 sound/core/seq/oss/seq_oss.c:141 __fput+0x2d0/0x958 fs/file_table.c:469 ____fput+0x14/0x20 fs/file_table.c:497 task_work_run+0x134/0x238 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] exit_to_user_mode_loop+0x194/0x1c8 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] exit_to_user_mode_prepare_legacy include/linux/irq-entry-common.h:242 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline] el0_svc+0x258/0x29c arch/arm64/kernel/entry-common.c:725 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup