diff options
Diffstat (limited to 'sys/kern/kern_shutdown.c')
| -rw-r--r-- | sys/kern/kern_shutdown.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/sys/kern/kern_shutdown.c b/sys/kern/kern_shutdown.c index ad79fdcbbb79..55c4ba47d973 100644 --- a/sys/kern/kern_shutdown.c +++ b/sys/kern/kern_shutdown.c @@ -548,6 +548,10 @@ dumpstatus(vm_offset_t addr, long count) return 0; } +#ifdef SMP +static u_int panic_cpu = NOCPU; +#endif + /* * Panic is called on unresolvable fatal errors. It prints "panic: mesg", * and then reboots. If we are called twice, then we avoid trying to sync @@ -562,7 +566,11 @@ panic(const char *fmt, ...) #ifdef SMP /* Only 1 CPU can panic at a time */ - mtx_lock(&panic_mtx); + if (panic_cpu != PCPU_GET(cpuid) && + atomic_cmpset_int(&panic_cpu, NOCPU, PCPU_GET(cpuid)) == 0) { + for (;;) + ; /* nothing */ + } #endif bootopt = RB_AUTOBOOT | RB_DUMP; |