From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 8AFDC3BADA9; Thu, 7 May 2026 13:01:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778158869; cv=none; b=WWZMb4dDPoklxOpniSwLgWfJfrJQxXok2dMvdpMkwX0V1xhajxmUXYvfjLGclQgS5U4O1kcFIMelMLlFvGaWVA+5R2O05E0QuA4ONwKhWwNeBk6jQdUvvuCOGjA1Pk+CI8wq/4QqtVMqoQLi5pNaE8M6kPmV+oMjOe4gHAyiN/I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778158869; c=relaxed/simple; bh=leUnFvFz34yduHhbjTeAn585Ke4Spr5kPB9vhRqARDo=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=rnrC5uIsYKkkLeH5+9d3kL/OsbgqhrKPyN0ZbX20cabrvPBCOW7P6SqBtp0d2Not7I3BULUh/G1nwVuSuysvurFVzBxu/zxnEjirYxxz2C/lYJjlbMb8CaWFHAQNGwkuQH1sMalBkYdk31aicVrF5S9PcBAwb2kzPZynH9R3QhE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=desiato.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=lQ0+fDE5; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=desiato.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="lQ0+fDE5" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=aCmIFOigrkD0jwl//wwxiKRDqRnHS0891gEta4TqTUA=; b=lQ0+fDE5oOJsJb114ObjoZiI27 0HImb7p8x67InYxTiW6h+marD25ERG17YRcMYMbsTN/i2EW2Hq43leLU4T/p3iqvk2682diz7j9nH k6mly8hsMCh8duRUXUALAauYZVeR7fC9QhiSyJfgsJa4CAEd8bbGk1SemD/8sJGfPXea8oLPrjAEO aak8HaXMPtx4r86PN71OOo0RBsJL8bLVrOGP5urrAZmmH7ziK4SwUqirz1mXitEZGrxqu/VPTzKLR BF6Oad9WhNiWI7ynOwcDzArDyqNAN61Ihzbejt+vcWfGQUB3/M4u8HZZv6PPPx9cF1VR+hyXTm6oP 8FN3GODA==; Received: from [172.31.31.148] (helo=u09cd745991455d.ant.amazon.com) by desiato.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wKyLR-00000003YP1-2Wsn; Thu, 07 May 2026 13:00:49 +0000 Message-ID: Subject: Re: [PATCH] KVM: x86/xen: bail in IRQ context on PREEMPT_RT in kvm_xen_set_evtchn_fast() From: David Woodhouse To: Sebastian Andrzej Siewior Cc: Mauricio Faria de Oliveira , Paul Durrant , Sean Christopherson , Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Clark Williams , Steven Rostedt , kernel-dev@igalia.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, syzbot+208f7f3e5f59c11aeb90@syzkaller.appspotmail.com Date: Thu, 07 May 2026 14:00:49 +0100 In-Reply-To: <20260507071235.rdb4aGeE@linutronix.de> References: <20260506-xen-rt-sleep-v1-1-53b6b60a671d@igalia.com> <8e7bc66a7994ca06f164a5d5f7ceb3f07d3a1357.camel@infradead.org> <20260507071235.rdb4aGeE@linutronix.de> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-ios6Th2nDdkxhetVWoQF" User-Agent: Evolution 3.52.3-0ubuntu1.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html --=-ios6Th2nDdkxhetVWoQF Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2026-05-07 at 09:12 +0200, Sebastian Andrzej Siewior wrote: >=20 > So the cited patch does not look bad. That read-trylock should be fine > on RT (as in I don't see anything wrong with it). What did happen to it? The read_trylock() may be fine... but does a read_unlock() try to "re-enable" hardirqs? [ 112.266981] ------------[ cut here ]------------ [ 112.266987] DEBUG_LOCKS_WARN_ON(lockdep_hardirq_context()) [ 112.266990] WARNING: kernel/locking/lockdep.c:4404 at lockdep_hardirqs_o= n_prepare.part.0+0xca/0x140, CPU#139: swapper/139/0 [ 112.267010] Modules linked in: binfmt_misc cfg80211 rfkill 8021q garp mr= p stp llc vfat fat spi_nor pmt_telemetry mtd iTCO_wdt pmt_discovery intel_p= mc_bxt pmt_class intel_sdsi intel_rapl_msr intel_rapl_common intel_uncore_f= requency intel_uncore_frequency_common intel_ifs i10nm_edac skx_edac_common= nfit libnvdimm ena x86_pkg_temp_thermal intel_powerclamp coretemp rapl int= el_cstate snd_pcm snd_timer snd intel_uncore soundcore pcspkr dax_hmem isst= _if_mbox_pci isst_if_mmio isst_if_common intel_vsec spi_intel_pci i2c_i801 = spi_intel i2c_smbus i2c_ismt nfnetlink lz4hc_compress lz4_compress iaa_cryp= to nvme nvme_core nvme_keyring nvme_auth pinctrl_emmitsburg wmi qat_4xxx in= tel_qat idxd crc8 idxd_bus fuse [ 112.267088] CPU: 139 UID: 0 PID: 0 Comm: swapper/139 Not tainted 7.1.0-r= c2+ #13 PREEMPT_{RT,LAZY}=20 [ 112.267096] Hardware name: Amazon EC2 c7i.metal-48xl/Not Specified, BIOS= 1.0 10/16/2017 [ 112.267099] RIP: 0010:lockdep_hardirqs_on_prepare.part.0+0xd1/0x140 [ 112.267107] Code: 00 00 00 5b c3 cc cc cc cc e8 eb e5 8b 00 85 c0 74 cf = 8b 15 11 b5 62 02 85 d2 75 c5 48 8d 3d 66 54 64 02 48 c7 c6 40 4f 7e b4 <67= > 48 0f b9 3a 5b c3 cc cc cc cc e8 bf e5 8b 00 85 c0 74 a3 44 8b [ 112.267112] RSP: 0018:ff60c0a7cf974df8 EFLAGS: 00010046 [ 112.267118] RAX: 0000000000000001 RBX: ff251118e4165cf0 RCX: 00000000000= 00001 [ 112.267122] RDX: 0000000000000000 RSI: ffffffffb47e4f40 RDI: ffffffffb4f= cd6a0 [ 112.267125] RBP: ff60c0a7cf974e70 R08: 0000000000000001 R09: 00000000000= 00000 [ 112.267127] R10: 0000000000000000 R11: 0000000000000001 R12: ff251118e41= 66530 [ 112.267130] R13: ff251118e4166548 R14: ff251118e5d82bc0 R15: 00000000000= 00000 [ 112.267134] FS: 0000000000000000(0000) GS:ff2511184a123000(0000) knlGS:= 0000000000000000 [ 112.267138] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 112.267142] CR2: 0000000000000000 CR3: 000000535ee7c004 CR4: 0000000000f= 73ef0 [ 112.267146] PKRU: 55555554 [ 112.267148] Call Trace: [ 112.267151] [ 112.267156] trace_hardirqs_on+0x18/0x100 [ 112.267172] ? lock_release.part.0+0x1c/0x50 [ 112.267179] _raw_spin_unlock_irq+0x28/0x50 [ 112.267193] rt_read_unlock+0x1a2/0x290 [ 112.267202] kvm_xen_set_evtchn_fast+0x347/0x480 [ 112.267217] ? __lock_release.isra.0+0x59/0x170 [ 112.267224] ? __pfx_xen_timer_callback+0x10/0x10 [ 112.267231] xen_timer_callback+0x8c/0xd0 [ 112.267239] __hrtimer_run_queues+0x86/0x3b0 [ 112.267253] hrtimer_interrupt+0x115/0x240 --=-ios6Th2nDdkxhetVWoQF Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw 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