From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C9BE0C54FB3 for ; Sun, 1 Jun 2025 05:27:35 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E9EDF10E031; Sun, 1 Jun 2025 05:27:34 +0000 (UTC) Received: from mail-il1-f206.google.com (mail-il1-f206.google.com [209.85.166.206]) by gabe.freedesktop.org (Postfix) with ESMTPS id 47E9910E031 for ; Sun, 1 Jun 2025 05:27:34 +0000 (UTC) Received: by mail-il1-f206.google.com with SMTP id e9e14a558f8ab-3da7c9e4bcfso28270385ab.0 for ; Sat, 31 May 2025 22:27:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1748755653; x=1749360453; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=xhaz7c8Ohx3uimT7eQ+45HbdR02cDIa2AQKiCPMYoL4=; b=vm4qISz5hDF1X7zvyrFvnJdlYCw/iVEM7OQq/jzS6wAa8DAg6z26IawHQxZz1P7uZi aryCQK92dCPNE7AeuFc5ZEqnk1IvCxjbHwMBnMt+RcKwrKgVJ7eLwf75daiKOYgJDJD3 jvvXMfwNFhX2yVSa2ebnZAHU6rX2rB/0D3IDfRCJ8p0Uty5xCc6ACwyi2/mnBmezQXwX wlf+1Phm0B/v0kCopbL30dBRENmpzGy3OLh02HQclcRWrZ0578SNoDTVnrP+N/DFUqy/ 9kJmRoohIkNnV+vChnPS08t+vxIvIVDm8TnDz5vYjIbErvQ9ZfSJrYbhOQ6ECHVLMdXM W8iQ== X-Forwarded-Encrypted: i=1; AJvYcCV3UQsBn40yXQBeKN599yO0CyGTsJJ24xrjiaBHP+RWCofvG0t08ALANbU3jEKHC1ywy82rkOIcbAc=@lists.freedesktop.org X-Gm-Message-State: AOJu0YwshQV1lBsHa5Y7YxywTOWLjV6la1YWDlXIXRFeTBXI15esk0qI 3q+jBGIPjm3vu4GGNLfWxSQqXDQaS6ERW3pdURl+g+azzmhZq+J4rdKhWeXQyiEP/SA4iMo2Wpk Y/Hp4CY+htvam0Gvzb9NnzPkC8OVtuZZi/+KZAMI2ebv/M+zFUEDw/k/En18= X-Google-Smtp-Source: AGHT+IGi/gyEf4DMw+FzEMKQjOH4vXvqvVJzPKkapkIP5lPSMqoB4BRhEHNI9ye2b5BSP43oLhamCJ74rttIpVjQ/b9SDde+QdBs MIME-Version: 1.0 X-Received: by 2002:a05:6e02:16c7:b0:3dc:868e:dae7 with SMTP id e9e14a558f8ab-3dda33d3149mr32072895ab.15.1748755653503; Sat, 31 May 2025 22:27:33 -0700 (PDT) Date: Sat, 31 May 2025 22:27:33 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <683be4c5.a00a0220.d8eae.0028.GAE@google.com> Subject: [syzbot] [dri?] possible deadlock in drm_mode_setcrtc From: syzbot To: airlied@gmail.com, dri-devel@lists.freedesktop.org, hamohammed.sa@gmail.com, linux-kernel@vger.kernel.org, louis.chauvet@bootlin.com, maarten.lankhorst@linux.intel.com, melissa.srw@gmail.com, mripard@kernel.org, simona@ffwll.ch, syzkaller-bugs@googlegroups.com, tzimmermann@suse.de Content-Type: text/plain; charset="UTF-8" X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Hello, syzbot found the following issue on: HEAD commit: d7fa1af5b33e Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=10597170580000 kernel config: https://syzkaller.appspot.com/x/.config?x=89c13de706fbf07a dashboard link: https://syzkaller.appspot.com/bug?extid=9f17e6387907dc224b18 compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/da97ad659b2c/disk-d7fa1af5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/659e123552a8/vmlinux-d7fa1af5.xz kernel image: https://storage.googleapis.com/syzbot-assets/6ec5dbf4643e/Image-d7fa1af5.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9f17e6387907dc224b18@syzkaller.appspotmail.com ====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 Not tainted ------------------------------------------------------ syz.0.268/7988 is trying to acquire lock: ffff0000d5c9c5d0 (&mm->mmap_lock){++++}-{4:4}, at: __might_fault+0x9c/0x124 mm/memory.c:7150 but task is already holding lock: ffff80009ce07948 (crtc_ww_class_mutex){+.+.}-{4:4}, at: drm_mode_setcrtc+0x3e4/0x182c drivers/gpu/drm/drm_crtc.c:730 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #7 (crtc_ww_class_mutex){+.+.}-{4:4}: ww_acquire_init include/linux/ww_mutex.h:162 [inline] drm_modeset_acquire_init+0x1d8/0x374 drivers/gpu/drm/drm_modeset_lock.c:250 drmm_mode_config_init+0xb0c/0x10d8 drivers/gpu/drm/drm_mode_config.c:462 vkms_modeset_init drivers/gpu/drm/vkms/vkms_drv.c:146 [inline] vkms_create drivers/gpu/drm/vkms/vkms_drv.c:207 [inline] vkms_init+0x2c0/0x5ac drivers/gpu/drm/vkms/vkms_drv.c:242 do_one_initcall+0x250/0x990 init/main.c:1257 do_initcall_level+0x154/0x214 init/main.c:1319 do_initcalls+0x84/0xf4 init/main.c:1335 do_basic_setup+0x8c/0xa0 init/main.c:1354 kernel_init_freeable+0x2dc/0x444 init/main.c:1567 kernel_init+0x24/0x1dc init/main.c:1457 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847 -> #6 (crtc_ww_class_acquire){+.+.}-{0:0}: ww_acquire_init include/linux/ww_mutex.h:161 [inline] drm_modeset_acquire_init+0x1b8/0x374 drivers/gpu/drm/drm_modeset_lock.c:250 drm_client_modeset_commit_atomic+0xcc/0x6ac drivers/gpu/drm/drm_client_modeset.c:1018 drm_client_modeset_commit_locked+0xd0/0x4a0 drivers/gpu/drm/drm_client_modeset.c:1182 drm_client_modeset_commit+0x50/0x7c drivers/gpu/drm/drm_client_modeset.c:1208 __drm_fb_helper_restore_fbdev_mode_unlocked+0x94/0x198 drivers/gpu/drm/drm_fb_helper.c:237 drm_fb_helper_set_par+0xa4/0x108 drivers/gpu/drm/drm_fb_helper.c:1359 fbcon_init+0xe4c/0x1d18 drivers/video/fbdev/core/fbcon.c:1112 visual_init+0x27c/0x540 drivers/tty/vt/vt.c:1011 do_bind_con_driver+0x7b8/0xdd8 drivers/tty/vt/vt.c:3831 do_take_over_console+0x824/0x97c drivers/tty/vt/vt.c:4397 do_fbcon_takeover+0x158/0x25c drivers/video/fbdev/core/fbcon.c:548 do_fb_registered drivers/video/fbdev/core/fbcon.c:2989 [inline] fbcon_fb_registered+0x354/0x4c8 drivers/video/fbdev/core/fbcon.c:3009 do_register_framebuffer drivers/video/fbdev/core/fbmem.c:449 [inline] register_framebuffer+0x44c/0x5ec drivers/video/fbdev/core/fbmem.c:515 __drm_fb_helper_initial_config_and_unlock+0x103c/0x159c drivers/gpu/drm/drm_fb_helper.c:1851 drm_fb_helper_initial_config+0x3c/0x58 drivers/gpu/drm/drm_fb_helper.c:1916 drm_fbdev_client_hotplug+0x154/0x22c drivers/gpu/drm/clients/drm_fbdev_client.c:52 drm_client_register+0x13c/0x1d4 drivers/gpu/drm/drm_client.c:140 drm_fbdev_client_setup+0x194/0x3d0 drivers/gpu/drm/clients/drm_fbdev_client.c:159 drm_client_setup+0x78/0x140 drivers/gpu/drm/clients/drm_client_setup.c:39 vkms_create drivers/gpu/drm/vkms/vkms_drv.c:218 [inline] vkms_init+0x4b8/0x5ac drivers/gpu/drm/vkms/vkms_drv.c:242 do_one_initcall+0x250/0x990 init/main.c:1257 do_initcall_level+0x154/0x214 init/main.c:1319 do_initcalls+0x84/0xf4 init/main.c:1335 do_basic_setup+0x8c/0xa0 init/main.c:1354 kernel_init_freeable+0x2dc/0x444 init/main.c:1567 kernel_init+0x24/0x1dc init/main.c:1457 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847 -> #5 (&client->modeset_mutex){+.+.}-{4:4}: __mutex_lock_common+0x1d0/0x2190 kernel/locking/mutex.c:601 __mutex_lock kernel/locking/mutex.c:746 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:798 drm_client_modeset_probe+0x2f0/0x4e88 drivers/gpu/drm/drm_client_modeset.c:843 __drm_fb_helper_initial_config_and_unlock+0xf0/0x159c drivers/gpu/drm/drm_fb_helper.c:1828 drm_fb_helper_initial_config+0x3c/0x58 drivers/gpu/drm/drm_fb_helper.c:1916 drm_fbdev_client_hotplug+0x154/0x22c drivers/gpu/drm/clients/drm_fbdev_client.c:52 drm_client_register+0x13c/0x1d4 drivers/gpu/drm/drm_client.c:140 drm_fbdev_client_setup+0x194/0x3d0 drivers/gpu/drm/clients/drm_fbdev_client.c:159 drm_client_setup+0x78/0x140 drivers/gpu/drm/clients/drm_client_setup.c:39 vkms_create drivers/gpu/drm/vkms/vkms_drv.c:218 [inline] vkms_init+0x4b8/0x5ac drivers/gpu/drm/vkms/vkms_drv.c:242 do_one_initcall+0x250/0x990 init/main.c:1257 do_initcall_level+0x154/0x214 init/main.c:1319 do_initcalls+0x84/0xf4 init/main.c:1335 do_basic_setup+0x8c/0xa0 init/main.c:1354 kernel_init_freeable+0x2dc/0x444 init/main.c:1567 kernel_init+0x24/0x1dc init/main.c:1457 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847 -> #4 (&helper->lock){+.+.}-{4:4}: __mutex_lock_common+0x1d0/0x2190 kernel/locking/mutex.c:601 __mutex_lock kernel/locking/mutex.c:746 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:798 __drm_fb_helper_restore_fbdev_mode_unlocked+0x74/0x198 drivers/gpu/drm/drm_fb_helper.c:228 drm_fb_helper_set_par+0xa4/0x108 drivers/gpu/drm/drm_fb_helper.c:1359 fbcon_init+0xe4c/0x1d18 drivers/video/fbdev/core/fbcon.c:1112 visual_init+0x27c/0x540 drivers/tty/vt/vt.c:1011 do_bind_con_driver+0x7b8/0xdd8 drivers/tty/vt/vt.c:3831 do_take_over_console+0x824/0x97c drivers/tty/vt/vt.c:4397 do_fbcon_takeover+0x158/0x25c drivers/video/fbdev/core/fbcon.c:548 do_fb_registered drivers/video/fbdev/core/fbcon.c:2989 [inline] fbcon_fb_registered+0x354/0x4c8 drivers/video/fbdev/core/fbcon.c:3009 do_register_framebuffer drivers/video/fbdev/core/fbmem.c:449 [inline] register_framebuffer+0x44c/0x5ec drivers/video/fbdev/core/fbmem.c:515 __drm_fb_helper_initial_config_and_unlock+0x103c/0x159c drivers/gpu/drm/drm_fb_helper.c:1851 drm_fb_helper_initial_config+0x3c/0x58 drivers/gpu/drm/drm_fb_helper.c:1916 drm_fbdev_client_hotplug+0x154/0x22c drivers/gpu/drm/clients/drm_fbdev_client.c:52 drm_client_register+0x13c/0x1d4 drivers/gpu/drm/drm_client.c:140 drm_fbdev_client_setup+0x194/0x3d0 drivers/gpu/drm/clients/drm_fbdev_client.c:159 drm_client_setup+0x78/0x140 drivers/gpu/drm/clients/drm_client_setup.c:39 vkms_create drivers/gpu/drm/vkms/vkms_drv.c:218 [inline] vkms_init+0x4b8/0x5ac drivers/gpu/drm/vkms/vkms_drv.c:242 do_one_initcall+0x250/0x990 init/main.c:1257 do_initcall_level+0x154/0x214 init/main.c:1319 do_initcalls+0x84/0xf4 init/main.c:1335 do_basic_setup+0x8c/0xa0 init/main.c:1354 kernel_init_freeable+0x2dc/0x444 init/main.c:1567 kernel_init+0x24/0x1dc init/main.c:1457 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847 -> #3 (console_lock){+.+.}-{0:0}: console_lock+0x194/0x1ec kernel/printk/printk.c:2849 __bch2_print_string_as_lines fs/bcachefs/util.c:267 [inline] bch2_print_string_as_lines+0x34/0x150 fs/bcachefs/util.c:286 bucket_ref_update_err+0x1c8/0x21c fs/bcachefs/buckets.c:417 bch2_bucket_ref_update+0x3d8/0x888 fs/bcachefs/buckets.c:-1 __mark_pointer fs/bcachefs/buckets.c:572 [inline] bch2_trigger_pointer fs/bcachefs/buckets.c:618 [inline] __trigger_extent+0xd90/0x35fc fs/bcachefs/buckets.c:763 bch2_trigger_extent+0x3e4/0x78c fs/bcachefs/buckets.c:881 run_one_trans_trigger fs/bcachefs/btree_trans_commit.c:-1 [inline] bch2_trans_commit_run_triggers fs/bcachefs/btree_trans_commit.c:550 [inline] __bch2_trans_commit+0x7e8/0x62d0 fs/bcachefs/btree_trans_commit.c:990 bch2_trans_commit fs/bcachefs/btree_update.h:195 [inline] bch2_extent_update+0x2d8/0x7e8 fs/bcachefs/io_write.c:353 bch2_fpunch_at+0x4dc/0x98c fs/bcachefs/io_misc.c:187 __bchfs_fallocate+0xe80/0x1080 fs/bcachefs/fs-io.c:749 bchfs_fallocate+0x28c/0x538 fs/bcachefs/fs-io.c:789 bch2_fallocate_dispatch+0x344/0x4e0 fs/bcachefs/fs-io.c:836 vfs_fallocate+0x5cc/0x73c fs/open.c:338 ioctl_preallocate fs/ioctl.c:290 [inline] file_ioctl fs/ioctl.c:-1 [inline] do_vfs_ioctl+0x1d4c/0x2218 fs/ioctl.c:885 __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __arm64_sys_ioctl+0xe4/0x1c4 fs/ioctl.c:892 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #2 (bcachefs_btree){+.+.}-{0:0}: trans_set_locked+0x94/0x200 fs/bcachefs/btree_locking.h:198 bch2_trans_begin+0x6f8/0xa40 fs/bcachefs/btree_iter.c:3288 bch2_read_err_msg_trans+0x64/0x298 fs/bcachefs/io_read.c:346 __bch2_read_extent+0x21fc/0x3694 fs/bcachefs/io_read.c:975 bch2_read_extent fs/bcachefs/io_read.h:140 [inline] bchfs_read+0x1178/0x17dc fs/bcachefs/fs-io-buffered.c:226 bch2_read_single_folio+0x498/0x6e4 fs/bcachefs/fs-io-buffered.c:360 bch2_read_folio+0x40/0x84 fs/bcachefs/fs-io-buffered.c:378 filemap_read_folio+0xec/0x2f8 mm/filemap.c:2401 filemap_fault+0xd48/0x1278 mm/filemap.c:3495 bch2_page_fault+0x2cc/0x700 fs/bcachefs/fs-io-pagecache.c:594 __do_fault+0xf8/0x498 mm/memory.c:5098 do_shared_fault mm/memory.c:5582 [inline] do_fault mm/memory.c:5656 [inline] do_pte_missing mm/memory.c:4160 [inline] handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault mm/memory.c:6140 [inline] handle_mm_fault+0x1a08/0x4d18 mm/memory.c:6309 do_page_fault+0x598/0x1554 arch/arm64/mm/fault.c:690 do_translation_fault+0xc4/0x114 arch/arm64/mm/fault.c:783 do_mem_abort+0x70/0x194 arch/arm64/mm/fault.c:919 el0_da+0x64/0x160 arch/arm64/kernel/entry-common.c:627 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:789 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #1 (mapping.invalidate_lock#3){.+.+}-{4:4}: down_read+0x58/0x2f8 kernel/locking/rwsem.c:1524 filemap_invalidate_lock_shared include/linux/fs.h:922 [inline] filemap_fault+0x564/0x1278 mm/filemap.c:3391 bch2_page_fault+0x2cc/0x700 fs/bcachefs/fs-io-pagecache.c:594 __do_fault+0xf8/0x498 mm/memory.c:5098 do_read_fault mm/memory.c:5518 [inline] do_fault mm/memory.c:5652 [inline] do_pte_missing mm/memory.c:4160 [inline] handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault mm/memory.c:6140 [inline] handle_mm_fault+0x2cb0/0x4d18 mm/memory.c:6309 faultin_page mm/gup.c:1193 [inline] __get_user_pages+0x1dd4/0x30d8 mm/gup.c:1491 populate_vma_page_range+0x218/0x2e8 mm/gup.c:1929 __mm_populate+0x208/0x330 mm/gup.c:2032 mm_populate include/linux/mm.h:3487 [inline] vm_mmap_pgoff+0x378/0x43c mm/util.c:584 ksys_mmap_pgoff+0x394/0x5b8 mm/mmap.c:607 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #0 (&mm->mmap_lock){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1728/0x3058 kernel/locking/lockdep.c:5235 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5866 __might_fault+0xc4/0x124 mm/memory.c:7151 drm_mode_setcrtc+0xdc0/0x182c drivers/gpu/drm/drm_crtc.c:840 drm_ioctl_kernel+0x238/0x310 drivers/gpu/drm/drm_ioctl.c:796 drm_ioctl+0x65c/0xa5c drivers/gpu/drm/drm_ioctl.c:893 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:892 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 other info that might help us debug this: Chain exists of: &mm->mmap_lock --> crtc_ww_class_acquire --> crtc_ww_class_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(crtc_ww_class_mutex); lock(crtc_ww_class_acquire); lock(crtc_ww_class_mutex); rlock(&mm->mmap_lock); *** DEADLOCK *** 2 locks held by syz.0.268/7988: #0: ffff80009ce07920 (crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_mode_setcrtc+0x3e4/0x182c drivers/gpu/drm/drm_crtc.c:730 #1: ffff80009ce07948 (crtc_ww_class_mutex){+.+.}-{4:4}, at: drm_mode_setcrtc+0x3e4/0x182c drivers/gpu/drm/drm_crtc.c:730 stack backtrace: CPU: 1 UID: 0 PID: 7988 Comm: syz.0.268 Not tainted 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x324/0x32c kernel/locking/lockdep.c:2079 check_noncircular+0x154/0x174 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1728/0x3058 kernel/locking/lockdep.c:5235 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5866 __might_fault+0xc4/0x124 mm/memory.c:7151 drm_mode_setcrtc+0xdc0/0x182c drivers/gpu/drm/drm_crtc.c:840 drm_ioctl_kernel+0x238/0x310 drivers/gpu/drm/drm_ioctl.c:796 drm_ioctl+0x65c/0xa5c drivers/gpu/drm/drm_ioctl.c:893 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:892 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 --- This report is generated by a bot. 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