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The kernel panic was observed during iSCSI discovery via offload with below call trace, [ 2115.646901] BUG: unable to handle kernel NULL pointer dereference at (null) [ 2115.646909] IP: [<ffffffffacf7f0cc>] strncmp+0xc/0x60 [ 2115.646927] PGD 0 [ 2115.646932] Oops: 0000 [#1] SMP [ 2115.647107] CPU: 24 PID: 264 Comm: kworker/24:1 Kdump: loaded Tainted: G OE ------------ 3.10.0-957.el7.x86_64 #1 [ 2115.647133] Workqueue: slowpath-13:00. qed_slowpath_task [qed] [ 2115.647135] task: ffff8d66af80b0c0 ti: ffff8d66afb80000 task.ti: ffff8d66afb80000 [ 2115.647136] RIP: 0010:[<ffffffffacf7f0cc>] [<ffffffffacf7f0cc>] strncmp+0xc/0x60 [ 2115.647141] RSP: 0018:ffff8d66afb83c68 EFLAGS: 00010206 [ 2115.647143] RAX: 0000000000000001 RBX: 0000000000000007 RCX: 000000000000000a [ 2115.647144] RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8d632b3ba040 [ 2115.647145] RBP: ffff8d66afb83c68 R08: 0000000000000000 R09: 000000000000ffff [ 2115.647147] R10: 0000000000000007 R11: 0000000000000800 R12: ffff8d66a30007a0 [ 2115.647148] R13: ffff8d66747a3c10 R14: ffff8d632b3ba000 R15: ffff8d66747a32f8 [ 2115.647149] FS: 0000000000000000(0000) GS:ffff8d66aff00000(0000) knlGS:0000000000000000 [ 2115.647151] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2115.647152] CR2: 0000000000000000 CR3: 0000000509610000 CR4: 00000000007607e0 [ 2115.647153] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 2115.647154] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 2115.647155] PKRU: 00000000 [ 2115.647157] Call Trace: [ 2115.647165] [<ffffffffc0634cc5>] qedi_get_protocol_tlv_data+0x2c5/0x510 [qedi] [ 2115.647184] [<ffffffffc05968f5>] ? qed_mfw_process_tlv_req+0x245/0xbe0 [qed] [ 2115.647195] [<ffffffffc05496cb>] qed_mfw_fill_tlv_data+0x4b/0xb0 [qed] [ 2115.647206] [<ffffffffc0596911>] qed_mfw_process_tlv_req+0x261/0xbe0 [qed] [ 2115.647215] [<ffffffffacce0e8e>] ? dequeue_task_fair+0x41e/0x660 [ 2115.647221] [<ffffffffacc2a59e>] ? __switch_to+0xce/0x580 [ 2115.647230] [<ffffffffc0546013>] qed_slowpath_task+0xa3/0x160 [qed] [ 2115.647278] RIP [<ffffffffacf7f0cc>] strncmp+0xc/0x60 Fix kernel panic by validating the session targetname before providing TLV data and confirming the presence of boot targets. Signed-off-by: Nilesh Javali <njavali@marvell.com> Reviewed-by: Lee Duncan <lduncan@suse.com> Reviewed-by: Chris Leech <cleech@redhat.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.