From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 8B012216203; Tue, 5 Nov 2024 22:27:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730845667; cv=none; b=pdd8OHe9XCWaD/z5iKLzL1INeXCrU76cpJ7tyGTm/Q3PxBW+t6qfUjC+oYZdRdzyJ/2dOlmVQeQIIm6OUXPEFdC90XHrThrLkmj6oj5fuZg4FPm1GFy6eQbJduo1dbpOKXAHZ/P5cqeA6dmdTKYlQ0uVBcR16MlyTubOz12ptp0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730845667; c=relaxed/simple; bh=CKrmCIkLaQU5NUE44wCNKTKdHfiNO8Qtx34B+t3cZfw=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=tFetj3Y/8zWH5/54S53JQWiLHjLeMNjEKwWzgDOoA39nBuJCIeJq8lLkDaLxODg0H2ODVE/ZhjIyj00v7RZKaKT7Lv34oz+dQg1auWT5gW7JoxZHJjYwfHg2oFynrKKr01Lps4hRUr4dNjQBLGeyO0oDgHcLMrF7dXylBZCpuVg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=V9jSkbkQ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="V9jSkbkQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2F896C4CECF; Tue, 5 Nov 2024 22:27:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730845667; bh=CKrmCIkLaQU5NUE44wCNKTKdHfiNO8Qtx34B+t3cZfw=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=V9jSkbkQWZgAGkagXa4R189ctbFHdDoCfYrLt/RID3I8LJx0KTNBJ3tiPDDmtUaYT HeqLMn++LvZ+5pyqjHrtRxtHsHmuX4fkoT+BzsBy1L4hfjT3x6wPJuQsLpj/bFYpLe 569JuRYk5RYmJhB8O/HxeL+cpjF5lqWaCe9iMFaCH60hVQAq4RTPx331l/F4EypVQJ 65hkXwMdyCGkP7BhsfJCvUy//RMKJxfJh+2SQg8QJOhxR6pMF3Q8+9ELWJazwSouU5 kx7QwXFHJAZQM07wBrfN8Y5EgJihzgKRuFZLnXbQ1G5duLeM5cDw7qJlS5gx/LISSA ea6ESlNHCO7sA== Message-ID: Subject: Re: [PATCH v3 0/2] nfsd: allow the use of multiple backchannel slots From: Jeff Layton To: Olga Kornievskaia , cel@kernel.org Cc: Neil Brown , Dai Ngo , Tom Talpey , Chuck Lever , Olga Kornievskaia , linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org Date: Tue, 05 Nov 2024 17:27:44 -0500 In-Reply-To: References: <20241030-bcwide-v3-0-c2df49a26c45@kernel.org> <173032010891.47979.16372737966948328031.b4-ty@oracle.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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Hitting the following softlockup when running using nfsd-next code. > testing is same open bunch of file get delegations, do local > conflicting operation. Network trace shows a few cb_recalls occurring > successfully before the soft lockup (I can confirm that more than 1 > slot was used. But I also see that the server isn't trying to use the > lowest available slot but instead just bumps the number and uses the > next one. By that I mean, say slot 0 was used and a reply came back > but the next callback would use slot 1 instead of slot 0). >=20 If the slots are being consumed and not released then that's what you'd see. The question is why those slots aren't being released. Did the client return a SEQUENCE error on some of those callbacks? It looks like the slot doesn't always get released if that occurs, so that might be one possibility. > [ 344.045843] watchdog: BUG: soft lockup - CPU#0 stuck for 26s! > [kworker/u24:28:205] > [ 344.047669] Modules linked in: rpcrdma rdma_cm iw_cm ib_cm ib_core > nfsd auth_rpcgss nfs_acl lockd grace uinput isofs snd_seq_dummy > snd_hrtimer vsock_loopback vmw_vsock_virtio_transport_common qrtr > rfkill vmw_vsock_vmci_transport vsock sunrpc vfat fat uvcvideo > snd_hda_codec_generic snd_hda_intel videobuf2_vmalloc snd_intel_dspcfg > videobuf2_memops uvc snd_hda_codec videobuf2_v4l2 snd_hda_core > snd_hwdep videodev snd_seq snd_seq_device videobuf2_common snd_pcm mc > snd_timer snd vmw_vmci soundcore xfs libcrc32c vmwgfx nvme > drm_ttm_helper ttm crct10dif_ce ghash_ce sha2_ce sha256_arm64 > drm_kms_helper nvme_core sha1_ce sr_mod e1000e nvme_auth cdrom drm sg > fuse > [ 344.050421] CPU: 0 UID: 0 PID: 205 Comm: kworker/u24:28 Kdump: > loaded Not tainted 6.12.0-rc4+ #42 > [ 344.050821] Hardware name: VMware, Inc. VMware20,1/VBSA, BIOS > VMW201.00V.21805430.BA64.2305221830 05/22/2023 > [ 344.051248] Workqueue: rpciod rpc_async_schedule [sunrpc] > [ 344.051513] pstate: 11400005 (nzcV daif +PAN -UAO -TCO +DIT -SSBS BTYP= E=3D--) > [ 344.051821] pc : kasan_check_range+0x0/0x188 > [ 344.052011] lr : __kasan_check_write+0x1c/0x28 > [ 344.052208] sp : ffff800087027920 > [ 344.052352] x29: ffff800087027920 x28: 0000000000040000 x27: ffff0000a= 520f170 > [ 344.052710] x26: 0000000000000000 x25: 1fffe00014a41e2e x24: ffff00028= 41692c0 > [ 344.053159] x23: ffff0002841692c8 x22: 0000000000000000 x21: 1ffff0001= 0e04f2a > [ 344.053612] x20: ffff0002841692c0 x19: ffff80008318c2c0 x18: 000000000= 0000000 > [ 344.054054] x17: 0000006800000000 x16: 1fffe0000010fd60 x15: 0a0d37303= 736205d > [ 344.054501] x14: 3136335b0a0d3630 x13: 1ffff000104751c9 x12: ffff60001= 4a41e2f > [ 344.054952] x11: 1fffe00014a41e2e x10: ffff600014a41e2e x9 : dfff80000= 0000000 > [ 344.055402] x8 : 00009fffeb5be1d2 x7 : ffff0000a520f173 x6 : 000000000= 0000001 > [ 344.055735] x5 : ffff0000a520f170 x4 : 0000000000000000 x3 : ffff80008= 23129fc > [ 344.056058] x2 : 0000000000000001 x1 : 0000000000000002 x0 : ffff0000a= 520f172 > [ 344.056479] Call trace: > [ 344.056636] kasan_check_range+0x0/0x188 > [ 344.056886] queued_spin_lock_slowpath+0x5f4/0xaa0 > [ 344.057192] _raw_spin_lock+0x180/0x1a8 > [ 344.057436] rpc_sleep_on+0x78/0xe8 [sunrpc] > [ 344.057700] nfsd4_cb_prepare+0x15c/0x468 [nfsd] > [ 344.057935] rpc_prepare_task+0x70/0xa0 [sunrpc] > [ 344.058165] __rpc_execute+0x1e8/0xa48 [sunrpc] > [ 344.058388] rpc_async_schedule+0x90/0x100 [sunrpc] > [ 344.058623] process_one_work+0x598/0x1100 > [ 344.058818] worker_thread+0x6c0/0xa58 > [ 344.058992] kthread+0x288/0x310 > [ 344.059145] ret_from_fork+0x10/0x20 > [ 344.075846] watchdog: BUG: soft lockup - CPU#1 stuck for 26s! > [kworker/u24:27:204] > [ 344.076295] Modules linked in: rpcrdma rdma_cm iw_cm ib_cm ib_core > nfsd auth_rpcgss nfs_acl lockd grace uinput isofs snd_seq_dummy > snd_hrtimer vsock_loopback vmw_vsock_virtio_transport_common qrtr > rfkill vmw_vsock_vmci_transport vsock sunrpc vfat fat uvcvideo > snd_hda_codec_generic snd_hda_intel videobuf2_vmalloc snd_intel_dspcfg > videobuf2_memops uvc snd_hda_codec videobuf2_v4l2 snd_hda_core > snd_hwdep videodev snd_seq snd_seq_device videobuf2_common snd_pcm mc > snd_timer snd vmw_vmci soundcore xfs libcrc32c vmwgfx nvme > drm_ttm_helper ttm crct10dif_ce ghash_ce sha2_ce sha256_arm64 > drm_kms_helper nvme_core sha1_ce sr_mod e1000e nvme_auth cdrom drm sg > fuse > [ 344.079648] CPU: 1 UID: 0 PID: 204 Comm: kworker/u24:27 Kdump: > loaded Tainted: G L 6.12.0-rc4+ #42 > [ 344.080290] Tainted: [L]=3DSOFTLOCKUP > [ 344.080495] Hardware name: VMware, Inc. VMware20,1/VBSA, BIOS > VMW201.00V.21805430.BA64.2305221830 05/22/2023 > [ 344.080930] Workqueue: rpciod rpc_async_schedule [sunrpc] > [ 344.081212] pstate: 21400005 (nzCv daif +PAN -UAO -TCO +DIT -SSBS BTYP= E=3D--) > [ 344.081630] pc : _raw_spin_lock+0x108/0x1a8 > [ 344.081815] lr : _raw_spin_lock+0xf4/0x1a8 > [ 344.081998] sp : ffff800087017a30 > [ 344.082146] x29: ffff800087017a90 x28: ffff0000a520f170 x27: ffff60001= 48a1081 > [ 344.082467] x26: 1fffe000148a1081 x25: ffff0000a450840c x24: ffff0000a= 520ed40 > [ 344.082892] x23: ffff0000a4508404 x22: ffff0002e9028000 x21: ffff80008= 7017a50 > [ 344.083338] x20: 1ffff00010e02f46 x19: ffff0000a520f170 x18: 000000000= 0000000 > [ 344.083775] x17: 0000000000000000 x16: 0000000000000000 x15: 0000aaab0= 24bdd10 > [ 344.084217] x14: 0000000000000000 x13: 0000000000000000 x12: ffff70001= 0e02f4b > [ 344.084625] x11: 1ffff00010e02f4a x10: ffff700010e02f4a x9 : dfff80000= 0000000 > [ 344.084945] x8 : 0000000000000004 x7 : 0000000000000003 x6 : 000000000= 0000001 > [ 344.085264] x5 : ffff800087017a50 x4 : ffff700010e02f4a x3 : ffff80008= 2311154 > [ 344.085587] x2 : 0000000000000001 x1 : 0000000000000000 x0 : 000000000= 0000000 > [ 344.085915] Call trace: > [ 344.086028] _raw_spin_lock+0x108/0x1a8 > [ 344.086210] rpc_wake_up_queued_task+0x5c/0xf8 [sunrpc] > [ 344.086465] nfsd4_cb_prepare+0x168/0x468 [nfsd] > [ 344.086694] rpc_prepare_task+0x70/0xa0 [sunrpc] > [ 344.086922] __rpc_execute+0x1e8/0xa48 [sunrpc] > [ 344.087148] rpc_async_schedule+0x90/0x100 [sunrpc] > [ 344.087389] process_one_work+0x598/0x1100 > [ 344.087584] worker_thread+0x6c0/0xa58 > [ 344.087758] kthread+0x288/0x310 > [ 344.087909] ret_from_fork+0x10/0x20 >=20 > On Wed, Oct 30, 2024 at 4:30=E2=80=AFPM wrote: > >=20 > > From: Chuck Lever > >=20 > > On Wed, 30 Oct 2024 10:48:45 -0400, Jeff Layton wrote: > > > A few more minor updates to the set to fix some small-ish bugs, and d= o a > > > bit of cleanup. This seems to test OK for me so far. > > >=20 > > >=20 > >=20 > > Applied to nfsd-next for v6.13, thanks! Still open for comments and > > test results. > >=20 > > [1/2] nfsd: make nfsd4_session->se_flags a bool > > commit: d10f8b7deb4e8a3a0c75855fdad7aae9c1943816 > > [2/2] nfsd: allow for up to 32 callback session slots > > commit: 6c8910ac1cd360ea01136d707158690b5159a1d0 > >=20 > > -- > > Chuck Lever > >=20 > >=20 --=20 Jeff Layton