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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 Wemm 2001-10-19 23:32:03 +00:00
parent 94e0b85e76
commit 259ed91740
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);
}