From patchwork Tue May 12 03:13:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dennis Dalessandro X-Patchwork-Id: 11542011 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DE1D992A for ; Tue, 12 May 2020 03:13:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D07FD20643 for ; Tue, 12 May 2020 03:13:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728669AbgELDNT (ORCPT ); Mon, 11 May 2020 23:13:19 -0400 Received: from mga02.intel.com ([134.134.136.20]:42464 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727942AbgELDNS (ORCPT ); Mon, 11 May 2020 23:13:18 -0400 IronPort-SDR: vFmJbp8Yfkax03fFnQSw7ZiqtpwkDgBezO3o53aEyX4odSyP1ywiKXXfwYaUAjcKDHvGNgOITN pSUOUSrvm6eQ== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 May 2020 20:13:18 -0700 IronPort-SDR: TFZNO1qYM2vveSwlJKyGKavIKkXwIBIHCb0PXZSqq57sWgP3e0SC9rIoDanJNYhEhiUuwn3SeX t9ITPdt4NKGA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,381,1583222400"; d="scan'208";a="279977880" Received: from sedona.ch.intel.com ([10.2.136.157]) by orsmga002.jf.intel.com with ESMTP; 11 May 2020 20:13:18 -0700 Received: from awfm-01.aw.intel.com (awfm-01.aw.intel.com [10.228.212.213]) by sedona.ch.intel.com (8.14.3/8.14.3/Standard MailSET/Hub) with ESMTP id 04C3DH5K043349; Mon, 11 May 2020 20:13:17 -0700 Received: from awfm-01.aw.intel.com (localhost [127.0.0.1]) by awfm-01.aw.intel.com (8.14.7/8.14.7) with ESMTP id 04C3DFsh190304; Mon, 11 May 2020 23:13:16 -0400 Subject: [PATCH for-rc or next 1/3] IB/hfi1: Do not destroy hfi1_wq when the device is shut down From: Dennis Dalessandro To: jgg@ziepe.ca, dledford@redhat.com Cc: linux-rdma@vger.kernel.org, Mike Marciniszyn , stable@vger.kernel.org, Kaike Wan Date: Mon, 11 May 2020 23:13:15 -0400 Message-ID: <20200512031315.189865.15477.stgit@awfm-01.aw.intel.com> In-Reply-To: <20200512030622.189865.65024.stgit@awfm-01.aw.intel.com> References: <20200512030622.189865.65024.stgit@awfm-01.aw.intel.com> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: Kaike Wan The workqueue hfi1_wq is destroyed in function shutdown_device(), which is called by either shutdown_one() or remove_one(). The function shutdown_one() is called when the kernel is rebooted while remove_one() is called when the hfi1 driver is unloaded. When the kernel is rebooted, hfi1_wq is destroyed while all qps are still active, leading to a kernel crash: [ 198.891986] BUG: unable to handle kernel NULL pointer dereference at 0000000000000102 [ 198.892072] IP: [] __queue_work+0x32/0x3e0 [ 198.892130] PGD 0 [ 198.892156] Oops: 0000 [#1] SMP [ 198.892193] Modules linked in: dm_round_robin nvme_rdma(OE) nvme_fabrics(OE) nvme_core(OE) ib_isert iscsi_target_mod target_core_mod ib_ucm mlx4_ib iTCO_wdt iTCO_vendor_support mxm_wmi sb_edac intel_powerclamp coretemp intel_rapl iosf_mbi kvm rpcrdma sunrpc irqbypass crc32_pclmul ghash_clmulni_intel rdma_ucm aesni_intel ib_uverbs lrw gf128mul opa_vnic glue_helper ablk_helper ib_iser cryptd ib_umad rdma_cm iw_cm ses enclosure libiscsi scsi_transport_sas pcspkr joydev ib_ipoib(OE) scsi_transport_iscsi ib_cm sg ipmi_ssif mei_me lpc_ich i2c_i801 mei ioatdma ipmi_si dm_multipath ipmi_devintf ipmi_msghandler wmi acpi_pad acpi_power_meter hangcheck_timer ip_tables ext4 mbcache jbd2 mlx4_en sd_mod crc_t10dif crct10dif_generic mgag200 drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm hfi1(OE) [ 198.892997] crct10dif_pclmul crct10dif_common crc32c_intel drm ahci mlx4_core libahci rdmavt(OE) igb megaraid_sas ib_core libata drm_panel_orientation_quirks ptp pps_core devlink dca i2c_algo_bit dm_mirror dm_region_hash dm_log dm_mod [ 198.893233] CPU: 19 PID: 0 Comm: swapper/19 Kdump: loaded Tainted: G OE ------------ 3.10.0-957.el7.x86_64 #1 [ 198.893317] Hardware name: Phegda X2226A/S2600CW, BIOS SE5C610.86B.01.01.0024.021320181901 02/13/2018 [ 198.893388] task: ffff8a799ba0d140 ti: ffff8a799bad8000 task.ti: ffff8a799bad8000 [ 198.893447] RIP: 0010:[] [] __queue_work+0x32/0x3e0 [ 198.893518] RSP: 0018:ffff8a90dde43d80 EFLAGS: 00010046 [ 198.893561] RAX: 0000000000000082 RBX: 0000000000000086 RCX: 0000000000000000 [ 198.893617] RDX: ffff8a90b924fcb8 RSI: 0000000000000000 RDI: 000000000000001b [ 198.893674] RBP: ffff8a90dde43db8 R08: ffff8a799ba0d6d8 R09: ffff8a90dde53900 [ 198.893730] R10: 0000000000000002 R11: ffff8a90dde43de8 R12: ffff8a90b924fcb8 [ 198.893786] R13: 000000000000001b R14: 0000000000000000 R15: ffff8a90d2890000 [ 198.893843] FS: 0000000000000000(0000) GS:ffff8a90dde40000(0000) knlGS:0000000000000000 [ 198.893905] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 198.893953] CR2: 0000000000000102 CR3: 0000001a70410000 CR4: 00000000001607e0 [ 198.894009] Call Trace: [ 198.894058] [] queue_work_on+0x45/0x50 [ 198.894161] [] _hfi1_schedule_send+0x6e/0xc0 [hfi1] [ 198.894244] [] hfi1_schedule_send+0x32/0x70 [hfi1] [ 198.894311] [] rvt_rc_timeout+0xe9/0x130 [rdmavt] [ 198.894366] [] ? trigger_load_balance+0x6a/0x280 [ 198.894426] [] ? rvt_free_qpn+0x40/0x40 [rdmavt] [ 198.894482] [] call_timer_fn+0x38/0x110 [ 198.894537] [] ? rvt_free_qpn+0x40/0x40 [rdmavt] [ 198.894589] [] run_timer_softirq+0x24d/0x300 [ 198.894641] [] __do_softirq+0xf5/0x280 [ 198.894689] [] call_softirq+0x1c/0x30 [ 198.894736] [] do_softirq+0x65/0xa0 [ 198.894780] [] irq_exit+0x105/0x110 [ 198.894826] [] smp_apic_timer_interrupt+0x48/0x60 [ 198.894881] [] apic_timer_interrupt+0x162/0x170 [ 198.894930] [ 198.894955] [] ? cpuidle_enter_state+0x57/0xd0 [ 198.895012] [] cpuidle_idle_call+0xde/0x230 [ 198.895063] [] arch_cpu_idle+0xe/0xc0 [ 198.896984] [] cpu_startup_entry+0x14a/0x1e0 [ 198.898879] [] start_secondary+0x1f7/0x270 [ 198.900750] [] start_cpu+0x5/0x14 The solution is to destroy the workqueue only when the hfi1 driver is unloaded, not when the device is shut down. Fixes: 8d3e71136a08 ("IB/{hfi1, qib}: Add handling of kernel restart") Cc: Reviewed-by: Mike Marciniszyn Signed-off-by: Kaike Wan Signed-off-by: Dennis Dalessandro --- drivers/infiniband/hw/hfi1/init.c | 24 ++++++++++++++++++++---- 1 file changed, 20 insertions(+), 4 deletions(-) diff --git a/drivers/infiniband/hw/hfi1/init.c b/drivers/infiniband/hw/hfi1/init.c index 3759d92..10fb5c6 100644 --- a/drivers/infiniband/hw/hfi1/init.c +++ b/drivers/infiniband/hw/hfi1/init.c @@ -829,6 +829,25 @@ static int create_workqueues(struct hfi1_devdata *dd) } /** + * destroy_workqueues - destroy per port workqueues + * @dd: the hfi1_ib device + */ +static void destroy_workqueues(struct hfi1_devdata *dd) +{ + int pidx; + struct hfi1_pportdata *ppd; + + for (pidx = 0; pidx < dd->num_pports; ++pidx) { + ppd = dd->pport + pidx; + + if (ppd->hfi1_wq) { + destroy_workqueue(ppd->hfi1_wq); + ppd->hfi1_wq = NULL; + } + } +} + +/** * enable_general_intr() - Enable the IRQs that will be handled by the * general interrupt handler. * @dd: valid devdata @@ -1102,10 +1121,6 @@ static void shutdown_device(struct hfi1_devdata *dd) */ hfi1_quiet_serdes(ppd); - if (ppd->hfi1_wq) { - destroy_workqueue(ppd->hfi1_wq); - ppd->hfi1_wq = NULL; - } if (ppd->link_wq) { destroy_workqueue(ppd->link_wq); ppd->link_wq = NULL; @@ -1757,6 +1772,7 @@ static void remove_one(struct pci_dev *pdev) * clear dma engines, etc. */ shutdown_device(dd); + destroy_workqueues(dd); stop_timers(dd);