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[93.72.151.96]) by smtp.googlemail.com with ESMTPSA id b18sm187176lfp.89.2020.10.29.00.18.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 29 Oct 2020 00:18:41 -0700 (PDT) Subject: Re: 12.1-RELEASE-p7 panic in zio_free_issue_4_6 To: Christian Kratzer , freebsd-fs@freebsd.org References: From: Andriy Gapon Message-ID: <474d086c-5a36-0db5-974f-ccfa0acbd871@FreeBSD.org> Date: Thu, 29 Oct 2020 09:18:40 +0200 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:60.0) Gecko/20100101 Firefox/60.0 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 4CMGyD5pTFz4Hcj X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=pass (mx1.freebsd.org: domain of agapon@gmail.com designates 209.85.208.177 as permitted sender) smtp.mailfrom=agapon@gmail.com X-Spamd-Result: default: False [-2.70 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:209.85.128.0/17:c]; RCVD_COUNT_THREE(0.00)[3]; NEURAL_HAM_SHORT(-0.72)[-0.719]; RCPT_COUNT_TWO(0.00)[2]; FORGED_SENDER(0.30)[avg@FreeBSD.org,agapon@gmail.com]; RECEIVED_SPAMHAUS_PBL(0.00)[93.72.151.96:received]; MIME_TRACE(0.00)[0:+]; R_DKIM_NA(0.00)[]; FREEMAIL_ENVFROM(0.00)[gmail.com]; MID_RHS_MATCH_FROM(0.00)[]; FROM_NEQ_ENVFROM(0.00)[avg@FreeBSD.org,agapon@gmail.com]; ASN(0.00)[asn:15169, ipnet:209.85.128.0/17, country:US]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.97)[-0.975]; FROM_HAS_DN(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.004]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-fs@freebsd.org]; DMARC_NA(0.00)[FreeBSD.org]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[209.85.208.177:from]; RWL_MAILSPIKE_POSSIBLE(0.00)[209.85.208.177:from]; RCVD_TLS_ALL(0.00)[]; MAILMAN_DEST(0.00)[freebsd-fs] X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Oct 2020 07:18:45 -0000 On 28/10/2020 15:41, Christian Kratzer wrote: > Hi, > > one of my servers with 12.1-RELEASE-p7 started crashing with following > > Fatal trap 12: page fault while in kernel mode > cpuid = 19; apic id = 31 > fault virtual address   = 0x30 > fault code              = supervisor write data, page not present > instruction pointer     = 0x20:0xffffffff826877f4 > stack pointer           = 0x28:0xfffffe011cefeaa0 > frame pointer           = 0x28:0xfffffe011cefeaa0 > code segment            = base 0x0, limit 0xfffff, type 0x1b >                         = DPL 0, pres 1, long 1, def32 0, gran 1 > processor eflags        = interrupt enabled, resume, IOPL = 0 > current process         = 0 (zio_free_issue_2_3) > trap number             = 12 > panic: page fault > cpuid = 19 > time = 1603797129 > KDB: stack backtrace: > #0 0xffffffff80c1d2f7 at kdb_backtrace+0x67 > #1 0xffffffff80bd062d at vpanic+0x19d > #2 0xffffffff80bd0483 at panic+0x43 > #3 0xffffffff810a8dcc at trap_fatal+0x39c > #4 0xffffffff810a8e19 at trap_pfault+0x49 > #5 0xffffffff810a840f at trap+0x29f > #6 0xffffffff81081c9c at calltrap+0x8 > #7 0xffffffff8272a903 at zio_ddt_free+0x53 > #8 0xffffffff82727b7c at zio_execute+0xac > #9 0xffffffff80c2fad4 at taskqueue_run_locked+0x154 > #10 0xffffffff80c30e08 at taskqueue_thread_loop+0x98 > #11 0xffffffff80b90c43 at fork_exit+0x83 > #12 0xffffffff81082cde at fork_trampoline+0xe > Uptime: 1m12s > Automatic reboot in 15 seconds - press a key on the console to abort > > > I traced thigs down to importing one of the zpools. I suspect that you have a silent corruption on that pool (perhaps because of non-ECC RAM?). What you see can happen if a block pointer has a deduplication bit set, but the block is not actually deduplicated or deduplication has never been enabled at all. It would help -- with analysis -- to get a vmcore (kernel crash dump) and to install the corresponding kernel debug symbols (if not already). As to recovery, I think that the best solution is to import the pool read-only and to copy important data elsewhere. Then re-create the pool. -- Andriy