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([43.153.32.141]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-126f503ecf4sm3903960c88.15.2026.02.05.00.26.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Feb 2026 00:26:26 -0800 (PST) From: alexjlzheng@gmail.com X-Google-Original-From: alexjlzheng@tencent.com To: cem@kernel.org Cc: linux-xfs@vger.kernel.org, linux-kernel@vger.kernel.org, Jinliang Zheng Subject: [PATCH 1/2] xfs: take a breath in xlog_ioend_work() Date: Thu, 5 Feb 2026 16:26:20 +0800 Message-ID: <20260205082621.2259895-2-alexjlzheng@tencent.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20260205082621.2259895-1-alexjlzheng@tencent.com> References: <20260205082621.2259895-1-alexjlzheng@tencent.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Jinliang Zheng The xlog_ioend_work() function contains several nested loops with fairly complex operations, which may leads to: PID: 2604722 TASK: ffff88c08306b1c0 CPU: 263 COMMAND: "kworker/263:0H" #0 [ffffc9001cbf8d58] machine_kexec at ffffffff9d086081 #1 [ffffc9001cbf8db8] __crash_kexec at ffffffff9d20817a #2 [ffffc9001cbf8e78] panic at ffffffff9d107d8f #3 [ffffc9001cbf8ef8] watchdog_timer_fn at ffffffff9d243511 #4 [ffffc9001cbf8f28] __hrtimer_run_queues at ffffffff9d1e62ff #5 [ffffc9001cbf8f80] hrtimer_interrupt at ffffffff9d1e73d4 #6 [ffffc9001cbf8fd8] __sysvec_apic_timer_interrupt at ffffffff9d07bb29 #7 [ffffc9001cbf8ff0] sysvec_apic_timer_interrupt at ffffffff9dd689f9 --- --- #8 [ffffc900460a7c28] asm_sysvec_apic_timer_interrupt at ffffffff9de00e86 [exception RIP: slab_free_freelist_hook.constprop.0+107] RIP: ffffffff9d3ef74b RSP: ffffc900460a7cd0 RFLAGS: 00000286 RAX: ffff89ea4de06b00 RBX: ffff89ea4de06a00 RCX: ffff89ea4de06a00 RDX: 0000000000000100 RSI: ffffc900460a7d28 RDI: ffff888100044c80 RBP: ffff888100044c80 R8: 0000000000000000 R9: ffffffffc21e8500 R10: ffff88c867e93200 R11: 0000000000000001 R12: ffff89ea4de06a00 R13: ffffc900460a7d28 R14: ffff89ea4de06a00 R15: ffffc900460a7d30 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 #9 [ffffc900460a7d18] __kmem_cache_free at ffffffff9d3f65a0 #10 [ffffc900460a7d70] xlog_cil_committed at ffffffffc21e85af [xfs] #11 [ffffc900460a7da0] xlog_cil_process_committed at ffffffffc21e9747 [xf= s] #12 [ffffc900460a7dd0] xlog_state_do_iclog_callbacks at ffffffffc21e41eb = [xfs] #13 [ffffc900460a7e28] xlog_state_do_callback at ffffffffc21e436f [xfs] #14 [ffffc900460a7e50] xlog_ioend_work at ffffffffc21e6e1c [xfs] #15 [ffffc900460a7e70] process_one_work at ffffffff9d12de69 #16 [ffffc900460a7ea8] worker_thread at ffffffff9d12e79b #17 [ffffc900460a7ef8] kthread at ffffffff9d1378fc #18 [ffffc900460a7f30] ret_from_fork at ffffffff9d042dd0 #19 [ffffc900460a7f50] ret_from_fork_asm at ffffffff9d007e2b This patch adds cond_resched() to avoid softlockups similar to the one described above. Signed-off-by: Jinliang Zheng --- fs/xfs/xfs_log_cil.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c index 778ac47adb8c..c51c24f98acc 100644 --- a/fs/xfs/xfs_log_cil.c +++ b/fs/xfs/xfs_log_cil.c @@ -843,6 +843,8 @@ xlog_cil_ail_insert( LOG_ITEM_BATCH_SIZE, ctx->start_lsn); i =3D 0; } + + cond_resched(); } =20 /* make sure we insert the remainder! */ @@ -925,6 +927,7 @@ xlog_cil_process_committed( struct xfs_cil_ctx, iclog_entry))) { list_del(&ctx->iclog_entry); xlog_cil_committed(ctx); + cond_resched(); } } =20 --=20 2.49.0 From nobody Mon Feb 9 07:31:41 2026 Received: from mail-dl1-f41.google.com (mail-dl1-f41.google.com [74.125.82.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 113D23624AC for ; Thu, 5 Feb 2026 08:26:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.41 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770279990; cv=none; b=DDcQzJP5QEcEcJBziLdZWK7QDzZZ1O0fmmM0ixVT0J9ST550tl0R5Ie0dHAVZ0qqAT1qZbRbD8PeakoQAgd7ZHpBYMpMhkHEhhCTYNVDiTof++39qec5Pt75Q8YUBS1yEGyoxOosYF60pS664g+QeCRFqg6dvfYIa1rNslVlo8A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770279990; c=relaxed/simple; bh=nto/KS4yj9hTqP4//CUBcGLjOjJ6dcZLzmsk0/gJRTM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rGC33KDbYovhp57z7y3lxshdIvYy1ETv3GtLZXvUP1t1i5k/YnILdjkq9j+tnBa2euqYw2EPGXrg7jfAN/scll5Ba56y7el2MMECoSc0PFPLMHLGITYj/BuXpXDtror0iMfBdjJMfhB7bvNTqJmjP5cgMpLNB44JpzmPbeNgVSU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=JkEJzrI3; arc=none smtp.client-ip=74.125.82.41 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="JkEJzrI3" Received: by mail-dl1-f41.google.com with SMTP id a92af1059eb24-124afd03fd1so1202793c88.0 for ; Thu, 05 Feb 2026 00:26:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1770279989; x=1770884789; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=MxigY4Bd4BItH6ZE5l5QW7c2gKFO50DqpY5KS0BPjNY=; b=JkEJzrI3nqHXV5B+KrdJgrnbiYuRFGXNWWEAfEg4MrHaGH68h8/jXX+wFVIIYffPr9 mE/7p5ZSxilT4uoDtBiG1BB900svyCRspHlzNa3dkEdDBIlj6EVdr8a45bdA05T3M0R4 pEFIqgH6Ej8/IIUURgttTO9/CIsWSRYknrluLceSnoDTFQ9VLnn8WRC9QhY0WjbMlc/H 2y8pMcXK8A4fv+jml7gg+EiPTxzO5Sd5rv8+q6ZCdmfYYO36Rn9e9Y5xKhMkZtY4uXmp UTScDH/py4IjYMFiRQo8a3Ctnw1K9KO/RlgcLgDqk+SRLnttMqPSWdiyTBZH8p4TwN6e j69g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770279989; x=1770884789; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=MxigY4Bd4BItH6ZE5l5QW7c2gKFO50DqpY5KS0BPjNY=; b=PJEkSIpq2xD/ji3fEToTe1IiWEHZCFItLSMnSG00KUjCLCC0ikwKOCHowYF8qTz3Gl V3I35OGvTPmkGysiIhzt8QuNZIiWhPd5See+d51j9VWBidrHLqovbAwz1Z5f9JMztEeE J+wREPp6hAQ+Inu7TAE4GMLLKZuFhCvuYtTi2RbFUJgRvV07vFPfstp1s0rDC5/QB7Fg pyK03CtPOr2wczi3TXeSdjTDWXfmqqZuz3I5ncpBZbRY7K0XibT6K3z8mH9RO0JMBajW DBdWq2S28sssQ7M604zShAjJzcOmqgwqJ8Y1YVGDe1dJIiSVg/EEzqckmXGjZkWur9vb AZlg== X-Forwarded-Encrypted: i=1; AJvYcCWC1APIGvEmp6bWkM3opPer6rPjIoT4U3GfaqlfUdT17EEg5JpNB/bNRh6FRMSIibP3joaX31/inxtPEK4=@vger.kernel.org X-Gm-Message-State: AOJu0YyUkBmKwV8Os5Rf4al5bC5rwTevOrV2t7HF3CNdDQHflCG6P7xo NJjsq5ZdwdZU/CmIfNZwfSOl5zg/EFNVH9RYeU2zfTxhVStP3og7uLLY X-Gm-Gg: AZuq6aJYKLohhQyFAeBgQ0HRlzhIp74sR5faudPNHqtF4mvNOLNieO4C5Khvvblxq5E 1W1ekgoMNIW6PwT4Kr/w/Ik0HQjqSHuEoxDFwV4CiG8ohllJsWFF7tB05htqQ2e+o9m4gDVre2f +0bWBrAWAUv9exlNkCYHCp0IgjQZidSN+8bMQpv33qZEpehMVgF1lJAA9MbHYFKDgN/9CSiUotu sBygYmzEi6YU6jT8AYEYjG6F0Uo+0U5ym5ioj3zhshFgaZ8vkdziAp2TeYoP3ftCo0Zqb+ATvmV +yRr4q5zIRj8paKopH6H+xC/Q6Dk7inNv37IYqh712v+gvfVffLfcwv3FNAiWQwnbLJmyCCLTrV V8gfNbUwHfvbmqQsKLh4HqsaJoAo8vgj6HoJcByr1jnqYycmehVDgAmgpNUMz6W6I94LqhuQsqj 9OwiZ0RJq8pBqHHGiLJYlvRGs= X-Received: by 2002:a05:7022:6ba2:b0:11b:923d:773f with SMTP id a92af1059eb24-126f4781428mr2526250c88.5.1770279989082; Thu, 05 Feb 2026 00:26:29 -0800 (PST) Received: from VM-16-24-fedora.. ([43.153.32.141]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-126f503ecf4sm3903960c88.15.2026.02.05.00.26.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Feb 2026 00:26:28 -0800 (PST) From: alexjlzheng@gmail.com X-Google-Original-From: alexjlzheng@tencent.com To: cem@kernel.org Cc: linux-xfs@vger.kernel.org, linux-kernel@vger.kernel.org, Jinliang Zheng Subject: [PATCH 2/2] xfs: take a breath in xfsaild() Date: Thu, 5 Feb 2026 16:26:21 +0800 Message-ID: <20260205082621.2259895-3-alexjlzheng@tencent.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20260205082621.2259895-1-alexjlzheng@tencent.com> References: <20260205082621.2259895-1-alexjlzheng@tencent.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Jinliang Zheng We noticed a softlockup like: crash> bt PID: 5153 TASK: ffff8960a7ca0000 CPU: 115 COMMAND: "xfsaild/dm-4" #0 [ffffc9001b1d4d58] machine_kexec at ffffffff9b086081 #1 [ffffc9001b1d4db8] __crash_kexec at ffffffff9b20817a #2 [ffffc9001b1d4e78] panic at ffffffff9b107d8f #3 [ffffc9001b1d4ef8] watchdog_timer_fn at ffffffff9b243511 #4 [ffffc9001b1d4f28] __hrtimer_run_queues at ffffffff9b1e62ff #5 [ffffc9001b1d4f80] hrtimer_interrupt at ffffffff9b1e73d4 #6 [ffffc9001b1d4fd8] __sysvec_apic_timer_interrupt at ffffffff9b07bb29 #7 [ffffc9001b1d4ff0] sysvec_apic_timer_interrupt at ffffffff9bd689f9 --- --- #8 [ffffc90031cd3a18] asm_sysvec_apic_timer_interrupt at ffffffff9be00e86 [exception RIP: part_in_flight+47] RIP: ffffffff9b67960f RSP: ffffc90031cd3ac8 RFLAGS: 00000282 RAX: 00000000000000a9 RBX: 00000000000c4645 RCX: 00000000000000f5 RDX: ffffe89fffa36fe0 RSI: 0000000000000180 RDI: ffffffff9d1ae260 RBP: ffff898083d30000 R8: 00000000000000a8 R9: 0000000000000000 R10: ffff89808277d800 R11: 0000000000001000 R12: 0000000101a7d5be R13: 0000000000000000 R14: 0000000000001001 R15: 0000000000001001 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 #9 [ffffc90031cd3ad8] update_io_ticks at ffffffff9b6602e4 #10 [ffffc90031cd3b00] bdev_start_io_acct at ffffffff9b66031b #11 [ffffc90031cd3b20] dm_io_acct at ffffffffc18d7f98 [dm_mod] #12 [ffffc90031cd3b50] dm_submit_bio_remap at ffffffffc18d8195 [dm_mod] #13 [ffffc90031cd3b70] dm_split_and_process_bio at ffffffffc18d9799 [dm_m= od] #14 [ffffc90031cd3be0] dm_submit_bio at ffffffffc18d9b07 [dm_mod] #15 [ffffc90031cd3c20] __submit_bio at ffffffff9b65f61c #16 [ffffc90031cd3c38] __submit_bio_noacct at ffffffff9b65f73e #17 [ffffc90031cd3c80] xfs_buf_ioapply_map at ffffffffc23df4ea [xfs] #18 [ffffc90031cd3ce0] _xfs_buf_ioapply at ffffffffc23df64f [xfs] #19 [ffffc90031cd3d50] __xfs_buf_submit at ffffffffc23df7b8 [xfs] #20 [ffffc90031cd3d70] xfs_buf_delwri_submit_buffers at ffffffffc23dffbd = [xfs] #21 [ffffc90031cd3df8] xfsaild_push at ffffffffc24268e5 [xfs] #22 [ffffc90031cd3eb8] xfsaild at ffffffffc2426f88 [xfs] #23 [ffffc90031cd3ef8] kthread at ffffffff9b1378fc #24 [ffffc90031cd3f30] ret_from_fork at ffffffff9b042dd0 #25 [ffffc90031cd3f50] ret_from_fork_asm at ffffffff9b007e2b This patch adds cond_resched() to avoid softlockups similar to the one described above. Signed-off-by: Jinliang Zheng --- fs/xfs/xfs_buf.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c index 47edf3041631..f1f8595d5e40 100644 --- a/fs/xfs/xfs_buf.c +++ b/fs/xfs/xfs_buf.c @@ -2026,6 +2026,8 @@ xfs_buf_delwri_submit_nowait( bp->b_flags |=3D XBF_ASYNC; xfs_buf_list_del(bp); xfs_buf_submit(bp); + + cond_resched(); } blk_finish_plug(&plug); =20 --=20 2.49.0