CVSROOT: /cvs
Module name: src
Changes by: [email protected] 2020/03/23 09:42:10
Modified files:
sys/kern : kern_synch.c
Log message:
Prevent tsleep(9) with PCATCH from returning immediately without error
when called during execve(2). This was a caused by initializing sls_sig
with value 0 in r1.164 of kern_synch.c. Previously, tsleep(9) returned
immediately with EINTR in similar circumstances.
The immediate return without error can cause a system hang. For example,
vwaitforio() could end up spinning if called during execve(2) because
the thread did not enter sleep and other threads were not able to finish
the I/O.
tsleep
vwaitforio
nfs_flush
nfs_close
VOP_CLOSE
vn_closefile
fdrop
closef
fdcloseexec
sys_execve
Fix the issue by checking (p->p_flag & P_SUSPSINGLE) instead of
(p->p_p->ps_single != NULL) in sleep_setup_signal(). The former is more
selective than the latter and allows the thread that invokes execve(2)
enter sleep normally.
Bug report, change bisecting and testing help by Pavel Korovin
OK claudio@ mpi@
