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panic(9) [freebsd man page]

PANIC(9)						   BSD Kernel Developer's Manual						  PANIC(9)

NAME
panic -- bring down system on fatal error SYNOPSIS
#include <sys/types.h> #include <sys/systm.h> void panic(const char *fmt, ...); DESCRIPTION
The panic() function terminates the running system. The message fmt is a printf(3) style format string. The message is printed to the con- sole and the location panicstr is set to the address of the message text for retrieval from the OS core dump. If the kernel debugger is installed control is passed to it, otherwise an attempt to save a core dump of the OS to a configured dump device is made. If panic() is called twice (from the disk sync routines, for example) the system is rebooted without syncing the disks. RETURN VALUES
The panic() function does not return. BSD
August 11, 1995 BSD

Check Out this Related Man Page

PANIC(9)						   BSD Kernel Developer's Manual						  PANIC(9)

NAME
panic -- Bring down system on fatal error SYNOPSIS
#include <sys/types.h> #include <sys/systm.h> void vpanic(const char *fmt, va_list ap); void panic(const char *fmt, ...); DESCRIPTION
The panic() and vpanic() functions terminate the NetBSD system. The message fmt is a printf(3) style format string which is printed to the console and saved in the variable panicstr for later retrieval via core dump inspection. A newline character is added at the end automati- cally, and is thus not needed in the format string. If a kernel debugger is installed, control is passed to it after the message is printed. If the kernel debugger is ddb(4), control may be passed to it, depending on the value of ddb.onpanic. See options(4) for more details on setting ddb.onpanic. If control is not passed through to ddb(4), a ddb(4)-specific function is used to print the kernel stack trace, and then control returns to panic(). If control remains in panic(), an attempt is made to save an image of system memory on the configured dump device. If during the process of handling the panic, panic() is called again (from the filesystem synchronization routines, for example), the system is rebooted immediately without synchronizing any filesystems. panic() is meant to be used in situations where something unexpected has happened and it is difficult to recover the system to a stable state, or in situations where proceeding might make the things worse, leading to data corruption/loss. It is not meant to be used in scenar- ios where the system could easily ignore and/or isolate the condition/subsystem and proceed. In general developers should try to reduce the number of panic() calls in the kernel to improve stability. RETURN VALUES
The panic() function does not return. SEE ALSO
sysctl(3), ddb(4), ipkdb(4), options(4), savecore(8), swapctl(8), sysctl(8) BSD
September 29, 2011 BSD

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