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Description of problem: When loading module sbc_fitpc2_wdt i got kernel panic: BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffff81271f6b>] strcmp+0xb/0x30 PGD 3db38067 PUD 3dab2067 PMD 0 Oops: 0000 [#1] SMP last sysfs file: /sys/module/wm8350/refcnt CPU 7 Modules linked in: sbc_fitpc2_wdt(+) xp gru ab3100_core dcdbas sunrpc cpufreq_ondemand acpi_cpufreq freq_table mperf ipv6 e1000e bnx2 ipmi_si ipmi_msghandler hpwdt microcode serio_raw i5000_edac edac_core i5k_amb ext4 mbcache jbd2 hpsa cciss pata_acpi ata_generic ata_piix radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core dm_mirror dm_region_hash dm_log dm_mod [last unloaded: wm8350] Pid: 3699, comm: modprobe Tainted: G C ---------------- 2.6.32-220.4.2.el6.x86_64 #1 HP ProLiant DL360 G5 RIP: 0010:[<ffffffff81271f6b>] [<ffffffff81271f6b>] strcmp+0xb/0x30 RSP: 0018:ffff88003d38def8 EFLAGS: 00010292 RAX: 0000000000000053 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffffffffa0e426e8 RBP: ffff88003d38def8 R08: 0000000000000000 R09: 0000000000000000 R10: ffff88000240f180 R11: 0000000000000000 R12: ffffffffa0e45000 R13: 0000000000913490 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fb19cc14700(0000) GS:ffff8800023c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000003db1e000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process modprobe (pid: 3699, threadinfo ffff88003d38c000, task ffff88003daa6080) Stack: ffff88003d38df18 ffffffffa0e45022 0000000000000000 0000000000000000 <0> ffff88003d38df48 ffffffff8100204c 0000000000000000 ffffffffa0e42860 <0> 0000000000003230 0000000000913490 ffff88003d38df78 ffffffff810af4e1 Call Trace: [<ffffffffa0e45022>] fitpc2_wdt_init+0x22/0x146 [sbc_fitpc2_wdt] [<ffffffff8100204c>] do_one_initcall+0x3c/0x1d0 [<ffffffff810af4e1>] sys_init_module+0xe1/0x250 [<ffffffff8100b0f2>] system_call_fastpath+0x16/0x1b Code: 84 ff 40 88 39 74 0d 48 83 c1 01 48 83 ea 01 75 e7 c6 01 00 c9 c3 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 0f 1f 40 00 0f b6 07 <0f> b6 16 48 83 c7 01 48 83 c6 01 38 d0 75 0e 84 c0 75 ea 31 c0 RIP [<ffffffff81271f6b>] strcmp+0xb/0x30 RSP <ffff88003d38def8> CR2: 0000000000000000 ---[ end trace 8a9fbed50005ed48 ]--- Kernel panic - not syncing: Fatal exception Pid: 3699, comm: modprobe Tainted: G D C ---------------- 2.6.32-220.4.2.el6.x86_64 #1 Call Trace: [<ffffffff814ec2ba>] ? panic+0x78/0x143 [<ffffffff814f0444>] ? oops_end+0xe4/0x100 [<ffffffff8104234b>] ? no_context+0xfb/0x260 [<ffffffff810425d5>] ? __bad_area_nosemaphore+0x125/0x1e0 [<ffffffff810426fe>] ? bad_area+0x4e/0x60 [<ffffffff81042e03>] ? __do_page_fault+0x3c3/0x480 [<ffffffff81278f8c>] ? __bitmap_weight+0x8c/0xb0 [<ffffffff8112433f>] ? free_hot_page+0x2f/0x60 [<ffffffff81010b2e>] ? copy_user_generic+0xe/0x20 [<ffffffff81114831>] ? probe_kernel_write+0x41/0x70 [<ffffffff814f23fe>] ? do_page_fault+0x3e/0xa0 [<ffffffffa0e45000>] ? fitpc2_wdt_init+0x0/0x146 [sbc_fitpc2_wdt] [<ffffffff814ef7b5>] ? page_fault+0x25/0x30 [<ffffffffa0e45000>] ? fitpc2_wdt_init+0x0/0x146 [sbc_fitpc2_wdt] [<ffffffff81271f6b>] ? strcmp+0xb/0x30 [<ffffffff81096d15>] ? __blocking_notifier_call_chain+0x65/0x80 [<ffffffffa0e45022>] ? fitpc2_wdt_init+0x22/0x146 [sbc_fitpc2_wdt] [<ffffffff8100204c>] ? do_one_initcall+0x3c/0x1d0 [<ffffffff810af4e1>] ? sys_init_module+0xe1/0x250 [<ffffffff8100b0f2>] ? system_call_fastpath+0x16/0x1b panic occurred, switching back to text console Version-Release number of selected component (if applicable): How reproducible: This happened on hp-dl360g5-01.rhts.eng.bos.redhat.com in our beaker test lab. Recipe 409463 - https://beaker.engineering.redhat.com/recipes/409463 Steps to Reproduce: modprobe sbc_fitpc2_wdt Actual results: Kernel panic Expected results: The module is loaded successfully. Additional info: RHEL6.3-20120216.n.0_nfs-Server-x86_64
Since RHEL 6.3 External Beta has begun, and this bug remains unresolved, it has been rejected as it is not proposed as exception or blocker. Red Hat invites you to ask your support representative to propose this request, if appropriate and relevant, in the next release of Red Hat Enterprise Linux.
Patch(es) available on kernel-2.6.32-410.el6
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHSA-2013-1645.html