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Add a sysctl for preventing the sync() in panic() recovery. This can

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be so dangerous it isn't funny.  eg: if you panic inside NFS or softdep,
and then try and sync you run into held locks and cause either deadlocks,
recursive panics or other interesting chaos.  Default is unchanged.
This commit is contained in:
peter 2001-10-19 23:32:03 +00:00
parent b83678939d
commit f36c042920
1 changed files with 6 additions and 0 deletions
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6
sys/kern/kern_shutdown.c
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@ -91,6 +91,10 @@ SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
&debugger_on_panic, 0, "Run debugger on kernel panic");
#endif
int sync_on_panic = 1;
SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
&sync_on_panic, 0, "Do a sync before rebooting from a panic");
SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
#ifdef HW_WDOG
@ -625,6 +629,8 @@ panic(const char *fmt, ...)
}
#endif
#endif
if (!sync_on_panic)
bootopt |= RB_NOSYNC;
boot(bootopt);
}