From owner-freebsd-bugs@freebsd.org Sat Nov 16 09:58:48 2019 Return-Path: Delivered-To: freebsd-bugs@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 5BB4C1C0BAF for ; Sat, 16 Nov 2019 09:58:48 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.nyi.freebsd.org (mailman.nyi.freebsd.org [IPv6:2610:1c1:1:606c::50:13]) by mx1.freebsd.org (Postfix) with ESMTP id 47FVzX05qnz4XLN for ; Sat, 16 Nov 2019 09:58:48 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id 034731C0BAE; Sat, 16 Nov 2019 09:58:48 +0000 (UTC) Delivered-To: bugs@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 0227A1C0BAD for ; Sat, 16 Nov 2019 09:58:48 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 47FVzW5Rpyz4XL0 for ; Sat, 16 Nov 2019 09:58:47 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 9407D27A22 for ; Sat, 16 Nov 2019 09:58:47 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id xAG9wlSB017368 for ; Sat, 16 Nov 2019 09:58:47 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id xAG9wlRw017367 for bugs@FreeBSD.org; Sat, 16 Nov 2019 09:58:47 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 241980] panic: I/O to pool appears to be hung on vdev Date: Sat, 16 Nov 2019 09:58:47 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 11.3-STABLE X-Bugzilla-Keywords: panic X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: eugen@freebsd.org X-Bugzilla-Status: Open X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_status Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 16 Nov 2019 09:58:48 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D241980 Eugene Grosbein changed: What |Removed |Added ---------------------------------------------------------------------------- Status|New |Open --- Comment #17 from Eugene Grosbein --- Now I'm pretty sure the hardware is fune and there is some bug in ZFS logic= . I suspect this system triggers it by combination of multiple ZVOL snapshots created/removed every hour (tens or hundreds) combined with SSD-only RAIDZ1 pool (no HDDs), so huge amount of ATA TRIM operations are added every hours= to the queues (avl trees, in fact). Because of kernel hungs and inability to produce crashdump, I've patched ZFS code changing vfs.zfs.deadman_enabled to r/w sysctl. Also, the patch disabl= es panic if vfs.zfs.deadman_enabled=3D2 and adds additional logging to syslog = (not via zfs_dbgmsg) early when number of queued zio's hits 1/8th of standard li= mit of 1000 seconds. --=20 You are receiving this mail because: You are the assignee for the bug.=