Re: [Crash-utility] x86 remap allocator in kernel 3.0

----- Original Message ----- > On 01/11/2012 06:53 AM, Petr Tesarik wrote: >> Dne Út 10. ledna 2012 19:23:24 Petr Tesarik napsal(a): >>> Dne Út 10. ledna 2012 19:14:32 Petr Tesarik napsal(a): > ... [ cut ] ... >>> crash> vtop f2800080 >>> VIRTUAL PHYSICAL >>> f2800080 1fde00080 >>> >>> PAGE DIRECTORY: c08ed000 >>> PGD: c08ed018 => 8ea001 >>> PMD: 8eaca0 => 80000001fde001e3 >>> PAGE: 1fde00000 (2MB) >>> >>> PTE PHYSICAL FLAGS >>> 80000001fde001e3 1fde00000 >>> (PRESENT|RW|ACCESSED|DIRTY|PSE|GLOBAL|NX) >>> >>> PAGE PHYSICAL MAPPING INDEX CNT FLAGS >> >> BTW the data from struct page is really missing here. I traced this down to an >> integer overflow in dump_memory_nodes(): > ... [ cut ] ... >> David (Mair), could you address this, as already discussed in private mails, >> please? > > The attached patch fixes this for me. Hmmm, not so much for me... When I test the patch on RHEL5, RHEL6 and Fedora x86 kernels, the command always fails like this: crash> kmem -n NODE SIZE PGLIST_DATA BOOTMEM_DATA NODE_ZONES 0 262075 c0a3a680 c0aa5ce8 c0a3a680 c0a3b1c0 c0a3bd00 c0a3c840 MEM_MAP START_PADDR START_MAPNR Segmentation fault $ I haven't look into it, and this is probably not related: cc -c -g -DX86 -m32 -D_FILE_OFFSET_BITS=64 -DGDB_7_3_1 memory.c -Wall -O2 -Wstrict-prototypes -Wmissing-prototypes -fstack-protector memory.c: In function 'dump_memory_nodes': memory.c:13410: warning: cast to pointer from integer of different size memory.c:13199: warning: 'node_start_paddr' may be used uninitialized in this function But from under gdb: crash> kmem -n [Detaching after fork from child process 16870.] Program received signal SIGSEGV, Segmentation fault. 0x0809cd94 in mkstring (s=0xffe8a8bc " c0a3a680 ", size=16, flags=133, opt=0x1000<Address 0x1000 out of bounds>) at tools.c:1620 1620 sprintf(s, "%llx", *((ulonglong *)opt)); (gdb) bt #0 0x0809cd94 in mkstring (s=0xffe8a8bc " c0a3a680 ", size=16, flags=133, opt=0x1000<Address 0x1000 out of bounds>) at tools.c:1620 #1 0x080b1ad7 in dump_memory_nodes (initialize=0) at memory.c:13406 #2 0x080d46cc in cmd_kmem () at memory.c:4221 #3 0x080941b8 in exec_command () at main.c:751 #4 0x08093fe6 in main_loop () at main.c:699 #5 0x081db622 in current_interp_command_loop () #6 0x081dbf01 in captured_command_loop () #7 0x081db0a4 in catch_errors () #8 0x081dce07 in captured_main () #9 0x081db0a4 in catch_errors () #10 0x081dce49 in gdb_main () #11 0x081dce99 in gdb_main_entry () #12 0x08116668 in gdb_main_loop (argc=2, argv=0xffe8d494) at gdb_interface.c:75 #13 0x08093ce0 in main (argc=3, argv=0xffe8d494) at main.c:603 (gdb) p opt $1 = 0x1000<Address 0x1000 out of bounds> (gdb) I thought it might be just an x86 issue, but it also fails the same way on RHEL5, RHEL6 and Fedora x86_64 kernels.