From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E0D123D6472 for ; Fri, 28 Aug 2026 06:59:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787900388; cv=none; b=JIX+qIFnE18KTSUIQOB2Qdxg2C4AsQgKPMsDX2mDWXVwtJgYzcHk0d675Kps/f+bOMvcRQiEpLgpVca0KQ6T04JdEcq0K/S3hU/wt0j/TdR0dVMDUNw/n78PC5EGCc4CideOmzEKs34GQJxBrJ0diQct2gkrQqygaOENak9s1P4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787900388; c=relaxed/simple; bh=MdT3W271N3Wha9R1D5X427tnwnPEZ5bbdYUbKc1pl+Y=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=s+wt/5IoeQ5YDOGpht7CRIfaCNOXQwxUlLliFHiqdS5QtmR7PWLQsGix4LiZSKx4CPSHYEzLhqBMfyShXglleYOfwTZkX6kWM7/i0f6AdQLn8VduvkZHawhPBMhTu+169HYxp0bWzahBRiDXW8Kf6UzNh9Z5boC4CUpf2XuUVS0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=vyETShr+; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="vyETShr+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1AE8E1F000E9; Fri, 28 Aug 2026 06:59:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1787900387; bh=hi17zgl84PCeUep1FCq/kezNsaS1vttLaSBVh5BY5G4=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=vyETShr+HVQO11UydbAVGApL1wrSLEfOud3Io89QV8yi44dD/ahAb4SRADrB6w6Ig PmCchWHhEtCFOlHduLp+lWf+gPX/rzQw5ri4eoycqeGKR2deDH4uvdEh+x1zNntyXs RqJgSRbgWXBXOFxRQS5++BAzdbhEoJuo+p3yboUI= Date: Fri, 28 Aug 2026 08:59:45 +0200 From: Greg Kroah-Hartman To: Farhad Alemi Cc: Johan Hovold , Alex Elder , falemi@asu.edu, greybus-dev@lists.linaro.org, linux-kernel@vger.kernel.org Subject: Re: [BUG] greybus: ODEBUG free-active-timer in gb_operation_sync_timeout() Message-ID: <2026082839-corny-reputably-a5ff@gregkh> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Thu, Aug 27, 2026 at 10:42:25PM -0700, Farhad Alemi wrote: > Hello, > > As part of the kernel research at ASU's SEFCOM > lab, we hit the crash below. Crash reports can be found here: > > https://github.com/farhad-alemi/public_bug_reports/tree/main/165-warning-odebug-bug-in-gb-operation-sync-timeout/ > > ODEBUG: free active (active state 0) object: ffff888014747a70 object > type: timer_list hint: gb_operation_timeout+0x0/0x100 > drivers/greybus/operation.c:1265 > WARNING: lib/debugobjects.c:632 at > debug_check_no_obj_freed+0x3fd/0x540 lib/debugobjects.c:1156, CPU#1: > kworker/u8:3/10201 > Call Trace: > kmem_cache_free+0xcb/0x4d0 mm/slub.c:6378 > gb_operation_sync_timeout+0x1c7/0x270 drivers/greybus/operation.c:1172 > gb_operation_sync include/linux/greybus/operation.h:203 [inline] > gb_svc_dme_peer_get+0x10a/0x250 drivers/greybus/svc.c:428 > gb_interface_read_and_clear_init_status > drivers/greybus/interface.c:380 [inline] > gb_interface_enable+0x146/0x900 drivers/greybus/interface.c:1075 > gb_module_register_interface drivers/greybus/module.c:162 [inline] > gb_module_add+0x1b3/0x3d0 drivers/greybus/module.c:209 > > Our reproducer.c is available upon request. > > Happy to test a patch if that would help. Again, please send a patch.