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From Bugzilla Helper: User-Agent: Mozilla/4.78 [en] (X11; U; Linux 2.4.9-e.3enterprise i686) Description of problem: Alt-Sysrq-M panics the machine on what appears to be an attempted access of a virtual mem_map page that does not exist (i.e. has no backing) Version-Release number of selected component (if applicable): kernel-2.4.18-e.25 How reproducible: Always Steps to Reproduce: 1. Enter Alt-Sysrq-M on a machine w/sysrq enabled 2. 3. Actual Results: # SysRq : Show Memory Unable to handle kernel paging request at virtual address a0007fff8eaf8000 swapper[0]: Oops 8813272891392 --> show_mem [kernel] 0x1a0 <-- Pid: 0, comm: swapper psr : 0000101008026018 ifs : 800000000000058d ip : [<e000000004442080>] Not tainted unat: 0000000000000000 pfs : 000000000000058d rsc : 0000000000000003 rnat: 0000000000000000 bsps: e000000004ccff10 pr : 0000000000805965 ldrs: 0000000000000000 ccv : 0000000000000000 fpsr: 0009804c8a70033f b0 : e000000004442050 b6 : e00000000476bfa0 b7 : e00000000440d930 f6 : 1003e00000000000fedb0 f7 : 0ffdaa200000000000000 f8 : 100008000000000000000 f9 : 10002a000000000000000 r1 : e000000004ccff10 r2 : 0000000000000000 r3 : e00000000488e84d r8 : 0000000000000001 r9 : 0000000000000000 r10 : 000000000000172c r11 : 000000000000058d r12 : e0000040fffc7c60 r13 : e0000040fffc0000 r14 : a0007fff8e400000 r15 : a0007fff8eaf8000 r16 : a0007fff8eaf7fd0 r17 : a0007fff8eaf7fe0 r18 : 000000000000ffff r19 : e000000004adb580 r20 : e000000004adb588 r21 : e000000004adb598 r22 : 000000000000ffff r23 : 0000000000000000 r24 : 0000000000000058 r25 : 0000000000000059 r26 : 000000000000005a r27 : 0000000000000005 r28 : 0000000000000000 r29 : 0000000000000001 r30 : 0000000000000005 r31 : 0000000000000894 Call Trace: [<e000000004414870>] sp=0xe0000040fffc7850 bsp=0xe0000040fffc13d0 decoded to show_stack [kernel] 0x50 [<e0000000044150a0>] sp=0xe0000040fffc7a10 bsp=0xe0000040fffc1378 decoded to show_regs [kernel] 0x7c0 [<e000000004421c90>] sp=0xe0000040fffc7a30 bsp=0xe0000040fffc1350 decoded to die [kernel] 0x190 [<e000000004443f00>] sp=0xe0000040fffc7a30 bsp=0xe0000040fffc12f0 decoded to ia64_do_page_fault [kernel] 0x780 [<e00000000440dec0>] sp=0xe0000040fffc7ac0 bsp=0xe0000040fffc12f0 decoded to ia64_leave_kernel [kernel] 0x0 [<e000000004442080>] sp=0xe0000040fffc7c60 bsp=0xe0000040fffc1288 decoded to show_mem [kernel] 0x1a0 [<e000000004608460>] sp=0xe0000040fffc7c70 bsp=0xe0000040fffc1278 decoded to sysrq_handle_showmem [kernel] 0x20 [<e000000004608920>] sp=0xe0000040fffc7c70 bsp=0xe0000040fffc1230 decoded to __handle_sysrq_nolock [kernel] 0x100 [<e0000000046087f0>] sp=0xe0000040fffc7c70 bsp=0xe0000040fffc1200 decoded to handle_sysrq [kernel] 0x50 [<e000000004602000>] sp=0xe0000040fffc7c70 bsp=0xe0000040fffc11c8 decoded to handle_scancode [kernel] 0x420 [<a000000000144280>] sp=0xe0000040fffc7c80 bsp=0xe0000040fffc1198 decoded to emulate_raw [keybdev] 0x1c0 [<a0000000001444e0>] sp=0xe0000040fffc7c80 bsp=0xe0000040fffc1160 decoded to keybdev_event [keybdev] 0x40 [<a000000000128a30>] sp=0xe0000040fffc7c80 bsp=0xe0000040fffc1120 decoded to input_event_Rsmp_38547b54 [input] 0x970 [<a0000000001396f0>] sp=0xe0000040fffc7c80 bsp=0xe0000040fffc10c8 decoded to hidinput_hid_event [hid] 0x3d0 [<a000000000132570>] sp=0xe0000040fffc7c80 bsp=0xe0000040fffc1090 decoded to hid_process_event [hid] 0x50 [<a000000000132e10>] sp=0xe0000040fffc7c80 bsp=0xe0000040fffc1000 decoded to hid_input_field [hid] 0x830 [<a000000000133150>] sp=0xe0000040fffc7cb0 bsp=0xe0000040fffc0fa8 decoded to hid_input_report [hid] 0x2b0 [<a0000000001331f0>] sp=0xe0000040fffc7cb0 bsp=0xe0000040fffc0f88 decoded to hid_irq [hid] 0x50 [<a000000000114ba0>] sp=0xe0000040fffc7cb0 bsp=0xe0000040fffc0f50 decoded to sohci_return_urb [usb-ohci] 0x180 [<a00000000011b250>] sp=0xe0000040fffc7cb0 bsp=0xe0000040fffc0ed8 decoded to dl_done_list [usb-ohci] 0x230 [<a00000000011d360>] sp=0xe0000040fffc7cb0 bsp=0xe0000040fffc0e88 decoded to hc_interrupt [usb-ohci] 0x180 [<e000000004411370>] sp=0xe0000040fffc7cb0 bsp=0xe0000040fffc0e48 decoded to handle_IRQ_event [kernel] 0xf0 [<e000000004411bd0>] sp=0xe0000040fffc7cb0 bsp=0xe0000040fffc0df0 decoded to do_IRQ [kernel] 0x310 [<e000000004413e50>] sp=0xe0000040fffc7cc0 bsp=0xe0000040fffc0db0 decoded to ia64_handle_irq [kernel] 0xd0 [<e00000000440dec0>] sp=0xe0000040fffc7cc0 bsp=0xe0000040fffc0db0 decoded to ia64_leave_kernel [kernel] 0x0 [<e000000004415170>] sp=0xe0000040fffc7e60 bsp=0xe0000040fffc0d70 decoded to cpu_idle [kernel] 0x90 [<e0000000048ac1c0>] sp=0xe0000040fffc7e60 bsp=0xe0000040fffc0d60 decoded to start_secondary [kernel] 0x80 [<e0000000044081a0>] sp=0xe0000040fffc7e60 bsp=0xe0000040fffc0d60 decoded to start_ap [kernel] 0x1a0 <0>Kernel panic: not continuing In interrupt handler - not syncing Expected Results: The memory region data should be displayed if the loglevel is appropriate and the output stored in /var/log/messages. Additional info:
Jason has applied the RHEL3 patch to address this problem, so it will be fixed in his next 2.1AS-IA64 kernel update release.