Messages in this thread | | | Subject | 2.6.15-rc4 panic in __nr_to_section() with CONFIG_SPARSEMEM | From | Badari Pulavarty <> | Date | Wed, 07 Dec 2005 14:37:40 -0800 |
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Hi Andy,
I getting a panic while doing "cat /proc/<pid>/smaps" on a process. I debugged a little to find out that faulting IP is in _nr_to_section() - seems to be getting somehow called by pte_offset_map_lock() from smaps_pte_range (which show_smaps) calls.
Any ideas on why or how to debug further ?
Thanks, Badari
> dis -l 0xc000000000108380 20
/usr/src/linux-2.6.15-rc4/fs/proc/task_mmu.c: 210 <<<<<<<<<<<<<< 0xc000000000108390 <.show_smap+344>: rldicr r0,r0,32,31 0xc000000000108394 <.show_smap+348>: add r0,r10,r0 include/linux/mmzone.h: 529 0xc000000000108398 <.show_smap+352>: rldicl r9,r0,31,33 /usr/src/linux-2.6.15-rc4/fs/proc/task_mmu.c: 210 0xc00000000010839c <.show_smap+356>: rldicl r8,r0,52,12 include/linux/mmzone.h: 528 0xc0000000001083a0 <.show_smap+360>: rldicl r0,r0,40,24 include/linux/mmzone.h: 529 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< 0xc0000000001083a4 <.show_smap+364>: rldicr r9,r9,3,60 0xc0000000001083a8 <.show_smap+368>: ldx r11,r9,r11 <<<<<<
<1>Unable to handle kernel paging request for data at address 0xc0000001006d3698 Faulting instruction address: 0xc0000000001083a8 Oops: Kernel access of bad area, sig: 11 [#3] SMP NR_CPUS=128 NUMA PSERIES LPAR Modules linked in: evdev joydev st usbserial ehci_hcd ohci_hcd ipv6 usbcore dm_mod NIP: C0000000001083A8 LR: C0000000001082A8 CTR: 0000000000000000 REGS: c0000000e17a7860 TRAP: 0300 Not tainted (2.6.15-rc4) MSR: 8000000000009032 <EE,ME,IR,DR> CR: 24000424 XER: 20000010 DAR: C0000001006D3698, DSISR: 0000000040010000 TASK = c0000000d92c07e0[11538] 'cat' THREAD: c0000000e17a4000 CPU: 0 GPR00: 0000004000000600 C0000000E17A7AE0 C000000000635AF8 C0000000E17A7B50 GPR04: 0000000000000000 0000000000000000 C0000000E17A7B78 0000000000000000 GPR08: 0004000000600000 0000000100000018 0000000600000793 C0000000006D3680 GPR12: 0000000022000428 C0000000004DD000 000001003FFFFFFF C00000000F5FECC0 GPR16: C0000000DA912E00 0000010040000000 000001003FFFFFFF C0000000D984E100 GPR20: 0000000000000038 0000010040000000 000001000FFFFFFF C0000000E2A68000 GPR24: 000000001001740A 0000010010000000 C0000000E17A7B50 C0000000E2A68400 GPR28: 0000010000200000 0000010000000000 C00000000055ED50 0000010000000000 NIP [C0000000001083A8] .show_smap+0x170/0x39c LR [C0000000001082A8] .show_smap+0x70/0x39c Call Trace: [C0000000E17A7AE0] [C000000000108544] .show_smap+0x30c/0x39c (unreliable) [C0000000E17A7C10] [C0000000000EC2BC] .seq_read+0x4bc/0x510 [C0000000E17A7CF0] [C0000000000BB400] .vfs_read+0x174/0x254 [C0000000E17A7D90] [C0000000000BB5F0] .sys_read+0x54/0x9c [C0000000E17A7E30] [C000000000008600] syscall_exit+0x0/0x18 Instruction dump: 2faa0000 419e0188 3c004000 e97e8038 7fbfeb78 38e00000 780007c6 7c0a0214 7809f860 7808a302 78004602 79291f24 <7d69582a> 2fab0000 419e000c 78001d28
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