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authorSteven Rostedt <srostedt@redhat.com>2008-12-03 11:04:51 -0500
committerIngo Molnar <mingo@elte.hu>2008-12-03 17:15:03 +0100
commite8e1abe92fd7ea9d823a3aaf81d10e2cba593b6b (patch)
tree9ddeaf43558b2ad13c6b4758b17b84781f0217a7 /fs/sysfs/inode.c
parent0a37119d963e876ca86912497346ec50dea2541b (diff)
ftrace: fix race in function graph during fork
Impact: graph tracer race/crash fix There is a nasy race in startup of a new process running the function graph tracer. In fork.c: total_forks++; spin_unlock(&current->sighand->siglock); write_unlock_irq(&tasklist_lock); ftrace_graph_init_task(p); proc_fork_connector(p); cgroup_post_fork(p); return p; The new task is free to run as soon as the tasklist_lock is released. This is before the ftrace_graph_init_task. If the task does run it will be using the same ret_stack and curr_ret_stack as the parent. This will cause crashes that are difficult to debug. This patch moves the ftrace_graph_init_task to just after the alloc_pid code. This fixes the above race. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'fs/sysfs/inode.c')
0 files changed, 0 insertions, 0 deletions