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a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1680886736; x=1712422736; h=date:from:to:cc:subject:message-id:references: in-reply-to:mime-version; bh=JY0rb/6TkxvyEWETSnpSauPsq8aZjq3Vdc3o4V+9TVM=; b=QR+SMJYK9tK2ODG0pRde5wd1xs1otvYexLiJDtQIv2VNa3USING5scAs upyp5gO3IsgpctZfm67OJa4zM1wKtii/gxVllhkgESKhtsjTiN93Bue7F 8S1SZFQLAFQZVYewRGQ4v1ojGDDw/Ti2grcbbOBwpcO8cVoQTj5GRVpCy fOh6xz479UlI8Ni7RwD53i0WG/gVSGZx8n5eU2Zd3xb9Ec4vFFTTEu1wP MwSFRsp86waYKkAF9Q2yNVKNvrPdxLI8Rp+ZtNJHpO5cWmCCY5cQ3IveZ Co/giEWA7op1E9hgMLirfitHf9O7MdG9UeSio9OBUwiFwCSTrS1vi3nD+ Q==; X-Mailman-Original-Authentication-Results: smtp2.osuosl.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=QR+SMJYK X-Mailman-Original-Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=intel.com; Subject: Re: [Intel-wired-lan] [PATCH net v2] ice: clear number of qs when rings are free X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "intel-wired-lan@lists.osuosl.org" , Leon Romanovsky , "netdev@vger.kernel.org" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On Fri, Apr 07, 2023 at 04:12:49PM +0000, Mekala, SunithaX D wrote: > Still observing system hung > Test 1: Upon PF reset > Applied reproducer.patch in kernel, followed by below commands > echo 1 > /sys/module/ice/parameters/ice_reproduce_panic what is that? > echo 1 > /sys/class/net//device/reset > System did not hang but the PF interface went down with dmesg to reload driver > On unloading driver, system hangs with no response. > 2. On changing queues > Applied reproducer.patch in kernel, followed by below commands > echo 1 > /sys/module/ice/parameters/ice_reproduce_panic > ethtool -L $pf rx 1 tx 1 > System stops responding this is not enough info for us. You should be able to catch the splat (like below was included in commit message). I might be missing something, but to me zeroing num_rxq is not enough. In the rebuild path ice_vsi_set_num_qs() will re-init that *before* calling ice_vsi_alloc_arrays(), so if workqueue is still running there is a small time frame where driver will be in state of non-zero num_rxq without rx ring array being allocated. Only reset path cancels ptp->work. > > > > -----Original Message----- > > From: Intel-wired-lan On Behalf Of Michal Swiatkowski > > Sent: Monday, March 20, 2023 7:59 AM > > To: Leon Romanovsky > > Cc: netdev@vger.kernel.org; intel-wired-lan@lists.osuosl.org > > Subject: Re: [Intel-wired-lan] [PATCH net v2] ice: clear number of qs when rings are free > > > > On Mon, Mar 20, 2023 at 01:51:17PM +0200, Leon Romanovsky wrote: > > > On Mon, Mar 20, 2023 at 12:23:47PM +0100, Michal Swiatkowski wrote: > > > > In case rebuild fails not clearing this field can lead to call trace. > > > > > > > > [ +0.009792] BUG: kernel NULL pointer dereference, address: > > > > 0000000000000000 [ +0.000009] #PF: supervisor read access in kernel > > > > mode [ +0.000006] #PF: error_code(0x0000) - not-present page [ > > > > +0.000005] PGD 0 P4D 0 [ +0.000009] Oops: 0000 [#1] PREEMPT SMP PTI > > > > [ +0.000009] CPU: 45 PID: 77867 Comm: ice-ptp-0000:60 Kdump: loaded Tainted: G S OE 6.2.0-rc6+ #110 > > > > [ +0.000010] Hardware name: Dell Inc. PowerEdge R740/0JMK61, BIOS > > > > 2.11.2 004/21/2021 [ +0.000005] RIP: > > > > 0010:ice_ptp_update_cached_phctime+0xb0/0x130 [ice] [ +0.000145] > > > > Code: fa 7e 55 48 8b 93 48 01 00 00 48 8b 0c fa 48 85 c9 74 e1 8b 51 > > > > 68 85 d2 75 da 66 83 b9 86 04 00 00 00 74 d0 31 d2 48 8b 71 20 <48> > > > > 8b 34 d6 48 85 f6 74 07 48 89 86 d8 00 00 00 0f b7 b1 86 04 00 [ > > > > +0.000008] RSP: 0018:ffffa036cf7c7ea8 EFLAGS: 00010246 [ +0.000008] > > > > RAX: 174ab1a8ab400f43 RBX: ffff937cda2c01a0 RCX: ffff937cdca9b028 [ > > > > +0.000005] RDX: 0000000000000000 RSI: 0000000000000000 RDI: > > > > 0000000000000000 [ +0.000005] RBP: ffffa036cf7c7eb8 R08: > > > > 0000000000000000 R09: 0000000000000000 [ +0.000005] R10: > > > > 0000000000000080 R11: 0000000000000001 R12: ffff937cdc971f40 [ > > > > +0.000006] R13: ffff937cdc971f44 R14: 0000000000000001 R15: > > > > ffffffffc13f3210 [ +0.000005] FS: 0000000000000000(0000) > > > > GS:ffff93826f980000(0000) knlGS:0000000000000000 [ +0.000006] CS: > > > > 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ +0.000006] CR2: > > > > 0000000000000000 CR3: 00000004b7310002 CR4: 00000000007726e0 [ > > > > +0.000006] DR0: 0000000000000000 DR1: 0000000000000000 DR2: > > > > 0000000000000000 [ +0.000004] DR3: 0000000000000000 DR6: > > > > 00000000fffe0ff0 DR7: 0000000000000400 [ +0.000005] PKRU: > > > > 55555554 [ +0.000004] Call Trace: > > > > [ +0.000004] > > > > [ +0.000007] ice_ptp_periodic_work+0x2a/0x60 [ice] [ +0.000126] > > > > kthread_worker_fn+0xa6/0x250 [ +0.000014] ? > > > > __pfx_kthread_worker_fn+0x10/0x10 [ +0.000010] kthread+0xfc/0x130 > > > > [ +0.000009] ? __pfx_kthread+0x10/0x10 [ +0.000010] > > > > ret_from_fork+0x29/0x50 > > > > > > > > ice_ptp_update_cached_phctime() is calling ice_for_each_rxq macro, > > > > in case of rebuild fail the rx_ring is NULL and there is NULL > > > > pointer dereference. > > > > > > >> Also for future safety it is better to clear the size values for tx > > > > and rx ring when they are cleared. > > > > > > > > Fixes: 6624e780a577 ("ice: split ice_vsi_setup into smaller > > > > functions") > > > > Reported-by: Mateusz Palczewski > > > > Signed-off-by: Michal Swiatkowski > > > > > > > > --- > > > > v1 --> v2: > > > > * change subject to net and add fixes tag > > > > --- > > > > drivers/net/ethernet/intel/ice/ice_lib.c | 2 ++ > > > > 1 file changed, 2 insertions(+) > > _______________________________________________ > Intel-wired-lan mailing list > Intel-wired-lan@osuosl.org > https://lists.osuosl.org/mailman/listinfo/intel-wired-lan _______________________________________________ Intel-wired-lan mailing list Intel-wired-lan@osuosl.org https://lists.osuosl.org/mailman/listinfo/intel-wired-lan