> 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
Looks like it is looping here...
...
audit_syscall_exit
sys_write
vfs_write
sysfs_write_file
nr_overcommit_hugepages_store
audit_syscall_exit
audit_syscall_exit
sys_write
vfs_write
sysfs_write_file
nr_overcommit_hugepages_store
audit_syscall_exit
...
CAI Qian
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