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The kernel may fail to boot or devices may fail to come up when initializing iscsi_tcp devices starting with Linux 5.8. Commita79af8a64d("[SCSI] iscsi_tcp: use iscsi_conn_get_addr_param libiscsi function") introduced getpeername() within the session spinlock. Commit1b66d25361("bpf: Add get{peer, sock}name attach types for sock_addr") introduced BPF_CGROUP_RUN_SA_PROG_LOCK() within getpeername(), which acquires a mutex and when used from iscsi_tcp devices can now lead to "BUG: scheduling while atomic:" and subsequent damage. Ensure that the spinlock is released before calling getpeername() or getsockname(). sock_hold() and sock_put() are used to ensure that the socket reference is preserved until after the getpeername() or getsockname() complete. Link: https://bugzilla.redhat.com/show_bug.cgi?id=1877345 Link: https://lkml.org/lkml/2020/7/28/1085 Link: https://lkml.org/lkml/2020/8/31/459 Link: https://lore.kernel.org/r/20200928043329.606781-1-mark.mielke@gmail.com Fixes:a79af8a64d("[SCSI] iscsi_tcp: use iscsi_conn_get_addr_param libiscsi function") Fixes:1b66d25361("bpf: Add get{peer, sock}name attach types for sock_addr") Cc: stable@vger.kernel.org Reported-by: Marc Dionne <marc.c.dionne@gmail.com> Tested-by: Marc Dionne <marc.c.dionne@gmail.com> Reviewed-by: Mike Christie <michael.christie@oracle.com> Signed-off-by: Mark Mielke <mark.mielke@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.