----- Original Message ----- > > There are a couple of issues here: first, I think the overcommit > > value being overwritten > > is a bug and this needs to be addressed and fixed before we cover it > > by removing the sysfs > > file. > I have a reproducer mentioned in another thread. The trick is to run > this command at the end, > > echo "" >/proc/sys/vm/nr_overcommit_hugepages This caused the process hung. # echo "" >/sys/kernel/mm/hugepages/hugepages-1048576kB/nr_overcommit_hugepages # echo t >/proc/sysrq-trigger ... bash R running task 0 3189 3183 0x00000080 ffff8804196bfe58 ffffffff8149fcab 00007f4ab98c1700 ffffffff81130a40 ffff8804194495c0 0000000000014d80 0000000000000246 ffff8804196be010 ffff8804196bffd8 0000000000000000 00007f4ab98c1700 0000000000000000 Call Trace: [<ffffffff81130a40>] ? nr_overcommit_hugepages_store+0x0/0x70 [<ffffffff8100c9ae>] ? apic_timer_interrupt+0xe/0x20 [<ffffffff81130a40>] ? nr_overcommit_hugepages_store+0x0/0x70 [<ffffffff81226236>] ? strict_strtoul+0x46/0x70 [<ffffffff81130a7a>] ? nr_overcommit_hugepages_store+0x3a/0x70 [<ffffffff811e047b>] ? selinux_file_permission+0xfb/0x150 [<ffffffff811d9473>] ? security_file_permission+0x23/0x90 [<ffffffff811b9ae5>] ? sysfs_write_file+0x115/0x180 [<ffffffff811504f8>] ? vfs_write+0xc8/0x190 [<ffffffff81150d61>] ? sys_write+0x51/0x90 [<ffffffff8100c0f4>] ? sysret_audit+0x16/0x20 ... CAI Qian -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>