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a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1622450653; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=lpqD11VwesnaooS9bUD7mS99zEZv3FlhamNQHMGYvQI=; b=a0ECcmvE9ydE/OV9EcLul4CdIAVzDdOSyEAbwHRlXO/SRirG6s9uCnu8nWVikjprNl+ZjZ /dX41I44BCBBFT5/NTsnQt9zPx+hTWDTJ8PjBWHP+6uUqYglpc63LUBUxkaKFqdRlXw1x2 FDaquQEtJCAlx9Msq/aWp0e3ZjJL0Eo= Received: from director2.suse.de ([192.168.254.72]) by imap3-int with ESMTPSA id NFXXJNyhtGCKPgAALh3uQQ (envelope-from ); Mon, 31 May 2021 08:44:12 +0000 Subject: Re: [syzbot] kernel BUG in assertfail To: syzbot , clm@fb.com, dsterba@suse.com, josef@toxicpanda.com, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <000000000000f9136f05c39b84e4@google.com> From: Nikolay Borisov Message-ID: <21666193-5ad7-2656-c50f-33637fabb082@suse.com> Date: Mon, 31 May 2021 11:44:12 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <000000000000f9136f05c39b84e4@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Authentication-Results: imap.suse.de; none X-Spamd-Result: default: False [2.50 / 100.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; URI_HIDDEN_PATH(1.00)[https://syzkaller.appspot.com/x/.config?x=9f3da44a01882e99]; TAGGED_RCPT(0.00)[a6bf271c02e4fe66b4e4]; MIME_GOOD(-0.10)[text/plain]; SURBL_MULTI_FAIL(0.00)[syzkaller.appspot.com:server fail]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_SEVEN(0.00)[7]; RCVD_NO_TLS_LAST(0.10)[]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_COUNT_TWO(0.00)[2]; MID_RHS_MATCH_FROM(0.00)[]; SUSPICIOUS_RECIPS(1.50)[] Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 31.05.21 г. 10:53, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 1434a312 Merge branch 'for-5.13-fixes' of git://git.kernel.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=162843f3d00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=9f3da44a01882e99 > dashboard link: https://syzkaller.appspot.com/bug?extid=a6bf271c02e4fe66b4e4 > > Unfortunately, I don't have any reproducer for this issue yet. > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+a6bf271c02e4fe66b4e4@syzkaller.appspotmail.com > > assertion failed: !memcmp(fs_info->fs_devices->fsid, fs_info->super_copy->fsid, BTRFS_FSID_SIZE), in fs/btrfs/disk-io.c:3282 This means a device contains a btrfs filesystem which has a different FSID in its superblock than the fsid which all devices part of the same fs_devices should have. This can happen in 2 ways - memory corruption where either of the ->fsid member are corrupted or if there was a crash while a filesystem's fsid was being changed. We need more context about what the test did?