Hello. "cat /proc/vmstat" triggered below failure. [root@tomoyo ~]# cat /proc/vmstat nr_free_pages 50565 nr_inactive_anon 67 nr_active_anon 4098 nr_inactive_file 34934 nr_active_file 3598 nr_unevictable 0 nr_mlock 0 nr_anon_pages 4108 nr_mapped 3003 nr_file_pages 38610 nr_dirty 55 nr_writeback 0 nr_slab_reclaimable 24047 nr_slab_unreclaimable 6487 nr_page_table_pages 261 nr_kernel_stack 87 nr_unstable 0 nr_bounce 0 nr_vmscan_write 0 nr_writeback_temp 0 nr_isolated_anon 0 nr_isolated_file 0 nr_shmem 78 nr_dirtied 1150 nr_written 1093 nr_dirty_threshold 17819 nr_dirty_background_threshold 8909 pgpgin 153267 pgpgout 13776 pswpin 0 pswpout 0 pgalloc_dma 8 pgalloc_normal 201674 pgalloc_high 0 pgalloc_movable 0 pgfree 252447 pgactivate 3921 pgdeactivate 0 pgfault 470482 pgmajfault 365 pgrefill_dma 0 pgrefill_normal 0 pgrefill_high 0 pgrefill_movable 0 pgsteal_dma 0 pgsteal_normal 0 pgsteal_high 0 pgsteal_movable 0 pgscan_kswapd_dma 0 pgscan_kswapd_normal 0 pgscan_kswapd_high 0 pgscan_kswapd_movable 0 pgscan_direct_dma 0 pgscan_direct_normal 0 pgscan_direct_high 0 pgscan_direct_movable 0 pginodesteaKilled [root@tomoyo ~]# dmesg [ 104.226042] BUG: unable to handle kernel paging request at afc07757 [ 104.226746] IP: [<c0539449>] strnlen+0x9/0x20 [ 104.226746] *pde = 00000000 [ 104.226746] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC [ 104.226746] last sysfs file: /sys/block/fd0/dev [ 104.226746] Modules linked in: ipv6 video output sbs sbshc battery serio_raw ac floppy rtc_cmos rtc_core rtc_lib button pcnet32 mii i2c_piix4 i2c_core ccsecurity mptspi mptscsih mptbase scsi_transport_spi ext3 jbd mbcache [ 104.226746] [ 104.226746] Pid: 2931, comm: cat Not tainted 2.6.36-git17 #2 440BX Desktop Reference Platform/VMware Virtual Platform [ 104.226746] EIP: 0060:[<c0539449>] EFLAGS: 00010297 CPU: 0 [ 104.226746] EIP is at strnlen+0x9/0x20 [ 104.226746] EAX: afc07757 EBX: dd115000 ECX: afc07757 EDX: fffffffe [ 104.226746] ESI: dd114000 EDI: dd233ef8 EBP: dd233e5c ESP: dd233e5c [ 104.226746] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 [ 104.226746] Process cat (pid: 2931, ti=dd232000 task=dd030af0 task.ti=dd232000) [ 104.226746] Stack: [ 104.226746] dd233e8c c05373ed dd233e6c afc07757 ffff0af0 00000000 dd030f50 c0775590 [ 104.226746] c0775591 00000002 c0775590 dd233ef8 dd233ed0 c05380c6 ff0a0004 ffffffff [ 104.226746] 00000006 00000000 00001000 dd114000 dd114000 dd115000 c0775592 dd233efc [ 104.226746] Call Trace: [ 104.226746] [<c05373ed>] ? string+0x3d/0xf0 [ 104.226746] [<c05380c6>] ? vsnprintf+0x1d6/0x350 [ 104.226746] [<c04d608d>] ? seq_printf+0x2d/0x60 [ 104.226746] [<c049edcc>] ? vmstat_show+0x2c/0x30 [ 104.226746] [<c04d646a>] ? seq_read+0xda/0x370 [ 104.226746] [<c04fa348>] ? proc_reg_read+0x48/0x90 [ 104.226746] [<c04d6390>] ? seq_read+0x0/0x370 [ 104.226746] [<c04fa35d>] ? proc_reg_read+0x5d/0x90 [ 104.226746] [<c04bb6f4>] ? vfs_read+0x94/0x130 [ 104.226746] [<c04fa300>] ? proc_reg_read+0x0/0x90 [ 104.226746] [<c04bb94d>] ? sys_read+0x3d/0x70 [ 104.226746] [<c0402c50>] ? sysenter_do_call+0x12/0x36 [ 104.226746] Code: c3 90 55 85 c9 89 e5 57 89 c7 89 d0 74 05 f2 ae 75 01 4f 89 f8 5f 5d c3 8d 76 00 8d bc 27 00 00 00 00 55 89 c1 89 e5 89 c8 eb 06 <80> 38 00 74 07 40 4a 83 fa ff 75 f4 29 c8 5d c3 90 90 90 90 90 [ 104.226746] EIP: [<c0539449>] strnlen+0x9/0x20 SS:ESP 0068:dd233e5c [ 104.226746] CR2: 00000000afc07757 [ 104.259875] ---[ end trace 1f2e096de1d38845 ]--- What is strange, this failure occurs when tty is /dev/pts/0 (i.e. devpts filesystem / interactive ssh login session) and does not occur when tty is /dev/tty1 (i.e. console login session). 2.6.36 was OK. I haven't tested further. Regards. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
