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Created attachment 918010 [details] kernel lockup 1 Description of problem: When booting to an iSCSI target on kernel 3.15.3 and 3.15.4 it appears that a recent commit is causing a NULL pointer dereference Version-Release number of selected component (if applicable): kernel-3.15.4-200.fc20.x86_64 kernel-3.15.3-200.fc20.x86_64 How reproducible: Booting multi-user or single-user to an iSCSI target Actual results: Kernel locks up with the following messages, to name a few: [ 19.672549] BUG: unable to handle kernel NULL pointer dereference at 000000000000000c [ 19.680405] IP: [] iscsi_tcp_segment_done+0x2a8/0x370 [libiscsi_tcp] Expected results: System boots multi/single-user successfully Additional info: https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/drivers/scsi?h=linux-3.15.y&id=04423ddea30a7fb7232636eda8aed55ea5b972fe Looks to be the problem commit as referenced in this message: http://www.spinics.net/linux/lists/kernel/msg1776379.html The fix may have already been commited to -stable upstream here: https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/log/?id=refs%2Ftags%2Fv3.15.5&qt=grep&q=iscsi but does not appear to be in the fedora kernel yet Apologies for the attached pictures, it's been difficult to gather boot messages with our setup, but if more information is needed we can definitely provide it!
Created attachment 918012 [details] kernel lockup 2
Could you please try the 3.15.5 kernel build? It contains this commit: commit 65e98a83a95c5c3e5b6e686173054a557626909c Author: Martin K. Petersen <martin.petersen@oracle.com> Date: Tue Jun 24 16:59:35 2014 +0200 SCSI: use the scsi data buffer length to extract transfer size commit 5616b0a46ed82eb9a093f752fc4d7bd3cc688583 upstream. which is the commit you pointed to in the mailing list threads.
Just tested 3.15.5-200.fc20.x86_64 and this resolves the error, thanks!
kernel-3.15.5-200.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/kernel-3.15.5-200.fc20
kernel-3.15.5-200.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.