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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-4.51 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; RCVD_TLS_ALL(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCPT_COUNT_TWELVE(0.00)[14]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; MID_RHS_MATCH_FROM(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_HAS_DN(0.00)[]; FREEMAIL_CC(0.00)[oss.qualcomm.com,linux.intel.com,intel.com,kernel.org,gmail.com,ffwll.ch,amd.com,lists.freedesktop.org,vger.kernel.org]; TO_DN_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns,ffwll.ch:url,suse.de:mid,suse.de:dkim]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_TRACE(0.00)[suse.de:+] X-Spam-Flag: NO X-Spam-Level: X-Rspamd-Queue-Id: 409FF211E7 X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Action: no action X-Spam-Score: -4.51 Hi Am 11.07.25 um 16:46 schrieb Ville Syrjälä: > On Fri, Jul 11, 2025 at 11:08:03AM +0200, Simona Vetter wrote: >> On Thu, Jul 10, 2025 at 04:43:02PM -0700, Jeff Johnson wrote: >>> I'm trying to debug a hibernation issue with the ath12k driver, but to >>> establish a baseline I started with Linus' current tree. I have the following >>> enabled in my .config: >>> >>> CONFIG_PROVE_LOCKING=y >>> CONFIG_PROVE_RAW_LOCK_NESTING=y >>> CONFIG_PROVE_RCU=y >>> >>> As part of the baseline I observed the following: >> On a very quick guess I'd bet on the drm_client conversion for i915 to >> have broken something here. Adding more people. > Looks to me like it's simply due to this code in radeon: > > radeon_suspend_kms(...) > { > ... > if (notify_clients) { > console_lock(); > drm_client_dev_suspend(dev, true); > console_unlock(); > } > ... > } Good catch. This is most likely fallout from refactoring the client suspend code. Radeon is also the only driver calling this with holds_console_lock=true.  I'd say, try to remove the locking here and pass false as second argument. We can later remove that second argument as well. Console locking should only be a concern of the console client (aka. fbdev emulation). Best regards Thomas > >> -Sima >> >> >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ====================================================== >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: WARNING: possible circular locking dependency detected >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: 6.16.0-rc5+ #6 Not tainted >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ------------------------------------------------------ >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: kworker/u16:13/3787 is trying to acquire lock: >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ffff8881113e0308 (&dev->clientlist_mutex){+.+.}-{4:4}, at: drm_client_dev_suspend+0x37/0x250 [drm] >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: >>> but task is already holding lock: >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ffffffff8a2e4b80 (console_lock){+.+.}-{0:0}, at: radeon_suspend_kms+0x63b/0x7d0 [radeon] >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: >>> which lock already depends on the new lock. >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: >>> the existing dependency chain (in reverse order) is: >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: >>> -> #1 (console_lock){+.+.}-{0:0}: >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: console_lock+0x8d/0x130 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: drm_fb_helper_set_suspend_unlocked+0x10e/0x200 [drm_kms_helper] >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: drm_fbdev_client_suspend+0x24/0x30 [drm_client_lib] >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: drm_client_dev_suspend+0x138/0x250 [drm] >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: i915_drm_suspend.isra.0+0x74/0x260 [i915] >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: i915_pm_suspend+0x6b/0x90 [i915] >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: pci_pm_suspend+0x1e3/0x4f0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: dpm_run_callback+0xa0/0x100 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: device_suspend+0x41e/0xdc0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: async_suspend+0x1d/0x30 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: async_run_entry_fn+0x96/0x3e0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: process_one_work+0x86e/0x14b0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: worker_thread+0x5d0/0xfc0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: kthread+0x375/0x750 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ret_from_fork+0x215/0x2f0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ret_from_fork_asm+0x1a/0x30 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: >>> -> #0 (&dev->clientlist_mutex){+.+.}-{4:4}: >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: __lock_acquire+0x15b5/0x2ac0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: lock_acquire+0x154/0x2d0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: __mutex_lock+0x15f/0x12c0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: drm_client_dev_suspend+0x37/0x250 [drm] >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: radeon_suspend_kms+0x648/0x7d0 [radeon] >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: pci_pm_suspend+0x1e3/0x4f0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: dpm_run_callback+0xa0/0x100 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: device_suspend+0x41e/0xdc0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: async_suspend+0x1d/0x30 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: async_run_entry_fn+0x96/0x3e0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: process_one_work+0x86e/0x14b0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: worker_thread+0x5d0/0xfc0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: kthread+0x375/0x750 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ret_from_fork+0x215/0x2f0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ret_from_fork_asm+0x1a/0x30 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: >>> other info that might help us debug this: >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: Possible unsafe locking scenario: >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: CPU0 CPU1 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ---- ---- >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: lock(console_lock); >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: lock(&dev->clientlist_mutex); >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: lock(console_lock); >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: lock(&dev->clientlist_mutex); >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: >>> *** DEADLOCK *** >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: 4 locks held by kworker/u16:13/3787: >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: #0: ffff888100dee148 ((wq_completion)async){+.+.}-{0:0}, at: process_one_work+0xe97/0x14b0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: #1: ffff88813f22fd30 ((work_completion)(&entry->work)){+.+.}-{0:0}, at: process_one_work+0x7f6/0x14b0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: #2: ffff8881049241b0 (&dev->mutex){....}-{4:4}, at: device_suspend+0x3bd/0xdc0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: #3: ffffffff8a2e4b80 (console_lock){+.+.}-{0:0}, at: radeon_suspend_kms+0x63b/0x7d0 [radeon] >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: >>> stack backtrace: >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: CPU: 0 UID: 0 PID: 3787 Comm: kworker/u16:13 Not tainted 6.16.0-rc5+ #6 PREEMPT(voluntary) >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: Hardware name: Hewlett-Packard HP ZBook 14 G2/2216, BIOS M71 Ver. 01.31 02/24/2020 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: Workqueue: async async_run_entry_fn >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: Call Trace: >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: dump_stack_lvl+0x5b/0x80 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: print_circular_bug.cold+0x178/0x1be >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: check_noncircular+0x130/0x150 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? 0xffffffffc1600000 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? radeon_suspend_kms+0x63b/0x7d0 [radeon] >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: __lock_acquire+0x15b5/0x2ac0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: lock_acquire+0x154/0x2d0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? drm_client_dev_suspend+0x37/0x250 [drm] >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? __pfx_stack_trace_save+0x10/0x10 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? acpi_ut_release_mutex+0xba/0x150 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: __mutex_lock+0x15f/0x12c0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? drm_client_dev_suspend+0x37/0x250 [drm] >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? drm_client_dev_suspend+0x37/0x250 [drm] >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? add_lock_to_list+0x2c/0x1b0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? __pfx___mutex_lock+0x10/0x10 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? lock_acquire+0x154/0x2d0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? radeon_suspend_kms+0x63b/0x7d0 [radeon] >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? drm_client_dev_suspend+0x37/0x250 [drm] >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: drm_client_dev_suspend+0x37/0x250 [drm] >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: radeon_suspend_kms+0x648/0x7d0 [radeon] >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? __pfx_radeon_pmops_suspend+0x10/0x10 [radeon] >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: pci_pm_suspend+0x1e3/0x4f0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? __pfx_pci_pm_suspend+0x10/0x10 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: dpm_run_callback+0xa0/0x100 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? __pfx_dpm_run_callback+0x10/0x10 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: device_suspend+0x41e/0xdc0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? __pfx_device_suspend+0x10/0x10 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? __pfx_async_suspend+0x10/0x10 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: async_suspend+0x1d/0x30 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: async_run_entry_fn+0x96/0x3e0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: process_one_work+0x86e/0x14b0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? __pfx_process_one_work+0x10/0x10 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? assign_work+0x16c/0x240 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: worker_thread+0x5d0/0xfc0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? __pfx_worker_thread+0x10/0x10 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: kthread+0x375/0x750 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? __pfx_kthread+0x10/0x10 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? ret_from_fork+0x1f/0x2f0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? lock_release+0xc6/0x2a0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? __pfx_kthread+0x10/0x10 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ret_from_fork+0x215/0x2f0 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ? __pfx_kthread+0x10/0x10 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: ret_from_fork_asm+0x1a/0x30 >>> Jul 10 16:12:52 qca-HP-ZBook-14-G2 kernel: >>> >>> This doesn't seem to be the cause of the ath12k issue I'm debugging, >>> but thought it worth mentioning since I only see one similar report >>> on lore, and that didn't have any apparent follow-up: >>> https://lore.kernel.org/all/20250202161048.373f89c0@yea/ >>> >>> /jeff >> -- >> Simona Vetter >> Software Engineer, Intel Corporation >> http://blog.ffwll.ch -- -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstrasse 146, 90461 Nuernberg, Germany GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman HRB 36809 (AG Nuernberg)