[{"id":3673936,"web_url":"http://patchwork.ozlabs.org/comment/3673936/","msgid":"","date":"2026-04-07T04:06:50","subject":"Re: [PATCH] powerpc/fadump: Add timeout to RTAS busy-wait loops","submitter":{"id":79126,"url":"http://patchwork.ozlabs.org/api/people/79126/","name":"Ritesh Harjani (IBM)","email":"ritesh.list@gmail.com"},"content":"Adriano Vero writes:\n\n> The ibm,configure-kernel-dump RTAS call sites in\n> rtas_fadump_register(), rtas_fadump_unregister(), and\n> rtas_fadump_invalidate() polled indefinitely while firmware returned\n> a busy status. A misbehaving or hung firmware could stall these paths\n> forever, blocking fadump registration at boot or preventing clean\n> teardown.\n\nWas there an issue which you encountered? Can you share the details of\nthe same please?\n\n\n>\n> Track the accumulated delay in a total_wait counter and bail out with\n> -ETIMEDOUT if it reaches RTAS_FADUMP_MAX_WAIT_MS (60 seconds) before\n> firmware signals completion. This follows the bounded busy-wait pattern\n> used in rtas-rtc.c.\n>\n> Signed-off-by: Adriano Vero ","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=BGeJYY6z;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; helo=lists.ozlabs.org;\n envelope-from=linuxppc-dev+bounces-19419-incoming=patchwork.ozlabs.org@lists.ozlabs.org;\n receiver=patchwork.ozlabs.org)","lists.ozlabs.org;\n arc=none smtp.remote-ip=\"2607:f8b0:4864:20::430\"","lists.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","lists.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=BGeJYY6z;\n\tdkim-atps=neutral","lists.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gmail.com\n (client-ip=2607:f8b0:4864:20::430; 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I noticed the explicit `/* TODO: Add upper time limit for the delay\n*/` comments in rtas-fadump.c that had not yet been implemented.\n\nWhen cross-referencing this with other parts of the pSeries code (such as\nthe bounded busy-wait pattern used in rtas-rtc.c), it seemed that adding a\ntimeout is the standard defensive programming approach for these hypervisor\ncalls.\n\nSince these fadump registration and teardown paths happen during critical\nboot and state transition phases, a misbehaving hypervisor or firmware\nanomaly could lead to a hard-to-debug, silent system stall. I implemented\nthe 60-second timeout to resolve the pending TODOs and ensure the kernel\nremains resilient in those specific edge cases.\n\nThanks,\nAdriano\n\nOn Tue, Apr 7, 2026 at 6:07 AM Ritesh Harjani wrote:\n\n> Adriano Vero writes:\n>\n> > The ibm,configure-kernel-dump RTAS call sites in\n> > rtas_fadump_register(), rtas_fadump_unregister(), and\n> > rtas_fadump_invalidate() polled indefinitely while firmware returned\n> > a busy status. A misbehaving or hung firmware could stall these paths\n> > forever, blocking fadump registration at boot or preventing clean\n> > teardown.\n>\n> Was there an issue which you encountered? Can you share the details of\n> the same please?\n>\n>\n> >\n> > Track the accumulated delay in a total_wait counter and bail out with\n> > -ETIMEDOUT if it reaches RTAS_FADUMP_MAX_WAIT_MS (60 seconds) before\n> > firmware signals completion. This follows the bounded busy-wait pattern\n> > used in rtas-rtc.c.\n> >\n> > Signed-off-by: Adriano Vero \n>","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=rI2HEYqC;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; helo=lists.ozlabs.org;\n envelope-from=linuxppc-dev+bounces-19424-incoming=patchwork.ozlabs.org@lists.ozlabs.org;\n receiver=patchwork.ozlabs.org)","lists.ozlabs.org;\n arc=pass smtp.remote-ip=\"2a00:1450:4864:20::429\" arc.chain=google.com","lists.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","lists.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=rI2HEYqC;\n\tdkim-atps=neutral","lists.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gmail.com\n (client-ip=2a00:1450:4864:20::429; 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