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xfs: prevent NMI timeouts in cmn_err

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We currently have a global error message buffer in cmn_err that is
protected by a spin lock that disables interrupts.  Recently there
have been reports of NMI timeouts occurring when the console is
being flooded by SCSI error reports due to cmn_err() getting stuck
trying to print to the console while holding this lock (i.e. with
interrupts disabled). The NMI watchdog is seeing this CPU as
non-responding and so is triggering a panic.  While the trigger for
the reported case is SCSI errors, pretty much anything that spams
the kernel log could cause this to occur.

Realistically the only reason that we have the intemediate message
buffer is to prepend the correct kernel log level prefix to the log
message. The only reason we have the lock is to protect the global
message buffer and the only reason the message buffer is global is
to keep it off the stack. Hence if we can avoid needing a global
message buffer we avoid needing the lock, and we can do this with a
small amount of cleanup and some preprocessor tricks:

	1. clean up xfs_cmn_err() panic mask functionality to avoid
	   needing debug code in xfs_cmn_err()
	2. remove the couple of "!" message prefixes that still exist that
	   the existing cmn_err() code steps over.
	3. redefine CE_* levels directly to KERN_*
	4. redefine cmn_err() and friends to use printk() directly
	   via variable argument length macros.

By doing this, we can completely remove the cmn_err() code and the
lock that is causing the problems, and rely solely on printk()
serialisation to ensure that we don't get garbled messages.

A series of followup patches is really needed to clean up all the
cmn_err() calls and related messages properly, but that results in a
series that is not easily back portable to enterprise kernels. Hence
this initial fix is only to address the direct problem in the lowest
impact way possible.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Dave Chinner 2011-01-12 00:35:42 +00:00 committed by Alex Elder
parent 65a84a0f75
commit 73efe4a4dd
7 changed files with 94 additions and 112 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
fs/xfs/linux-2.6/xfs_sysctl.c
View File

@ -18,6 +18,7 @@
#include "xfs.h"
#include <linux/sysctl.h>
#include <linux/proc_fs.h>
#include "xfs_error.h"
static struct ctl_table_header *xfs_table_header;
@ -51,6 +52,26 @@ xfs_stats_clear_proc_handler(
return ret;
}
STATIC int
xfs_panic_mask_proc_handler(
ctl_table *ctl,
int write,
void __user *buffer,
size_t *lenp,
loff_t *ppos)
{
int ret, *valp = ctl->data;
ret = proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
if (!ret && write) {
xfs_panic_mask = *valp;
#ifdef DEBUG
xfs_panic_mask |= (XFS_PTAG_SHUTDOWN_CORRUPT | XFS_PTAG_LOGRES);
#endif
}
return ret;
}
#endif /* CONFIG_PROC_FS */
static ctl_table xfs_table[] = {
@ -77,7 +98,7 @@ static ctl_table xfs_table[] = {
.data = &xfs_params.panic_mask.val,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.proc_handler = xfs_panic_mask_proc_handler,
.extra1 = &xfs_params.panic_mask.min,
.extra2 = &xfs_params.panic_mask.max
},

107
fs/xfs/support/debug.c
View File

@ -25,80 +25,71 @@
#include "xfs_mount.h"
#include "xfs_error.h"
static char message[1024]; /* keep it off the stack */
static DEFINE_SPINLOCK(xfs_err_lock);
/* Translate from CE_FOO to KERN_FOO, err_level(CE_FOO) == KERN_FOO */
#define XFS_MAX_ERR_LEVEL 7
#define XFS_ERR_MASK ((1 << 3) - 1)
static const char * const err_level[XFS_MAX_ERR_LEVEL+1] =
{KERN_EMERG, KERN_ALERT, KERN_CRIT,
KERN_ERR, KERN_WARNING, KERN_NOTICE,
KERN_INFO, KERN_DEBUG};
void
cmn_err(register int level, char *fmt, ...)
cmn_err(
const char *lvl,
const char *fmt,
...)
{
char *fp = fmt;
int len;
ulong flags;
va_list ap;
struct va_format vaf;
va_list args;
level &= XFS_ERR_MASK;
if (level > XFS_MAX_ERR_LEVEL)
level = XFS_MAX_ERR_LEVEL;
spin_lock_irqsave(&xfs_err_lock,flags);
va_start(ap, fmt);
if (*fmt == '!') fp++;
len = vsnprintf(message, sizeof(message), fp, ap);
if (len >= sizeof(message))
len = sizeof(message) - 1;
if (message[len-1] == '\n')
message[len-1] = 0;
printk("%s%s\n", err_level[level], message);
va_end(ap);
spin_unlock_irqrestore(&xfs_err_lock,flags);
BUG_ON(level == CE_PANIC);
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
printk("%s%pV", lvl, &vaf);
va_end(args);
BUG_ON(strncmp(lvl, KERN_EMERG, strlen(KERN_EMERG)) == 0);
}
void
xfs_fs_vcmn_err(
int level,
xfs_fs_cmn_err(
const char *lvl,
struct xfs_mount *mp,
char *fmt,
va_list ap)
const char *fmt,
...)
{
unsigned long flags;
int len = 0;
struct va_format vaf;
va_list args;
level &= XFS_ERR_MASK;
if (level > XFS_MAX_ERR_LEVEL)
level = XFS_MAX_ERR_LEVEL;
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
spin_lock_irqsave(&xfs_err_lock,flags);
printk("%sFilesystem %s: %pV", lvl, mp->m_fsname, &vaf);
va_end(args);
if (mp) {
len = sprintf(message, "Filesystem \"%s\": ", mp->m_fsname);
BUG_ON(strncmp(lvl, KERN_EMERG, strlen(KERN_EMERG)) == 0);
}
/*
* Skip the printk if we can't print anything useful
* due to an over-long device name.
*/
if (len >= sizeof(message))
goto out;
/* All callers to xfs_cmn_err use CE_ALERT, so don't bother testing lvl */
void
xfs_cmn_err(
int panic_tag,
const char *lvl,
struct xfs_mount *mp,
const char *fmt,
...)
{
struct va_format vaf;
va_list args;
int panic = 0;
if (xfs_panic_mask && (xfs_panic_mask & panic_tag)) {
printk(KERN_ALERT "XFS: Transforming an alert into a BUG.");
panic = 1;
}
len = vsnprintf(message + len, sizeof(message) - len, fmt, ap);
if (len >= sizeof(message))
len = sizeof(message) - 1;
if (message[len-1] == '\n')
message[len-1] = 0;
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
printk("%s%s\n", err_level[level], message);
out:
spin_unlock_irqrestore(&xfs_err_lock,flags);
printk(KERN_ALERT "Filesystem %s: %pV", mp->m_fsname, &vaf);
va_end(args);
BUG_ON(level == CE_PANIC);
BUG_ON(panic);
}
void

23
fs/xfs/support/debug.h
View File

@ -20,15 +20,22 @@
#include <stdarg.h>
#define CE_DEBUG 7 /* debug */
#define CE_CONT 6 /* continuation */
#define CE_NOTE 5 /* notice */
#define CE_WARN 4 /* warning */
#define CE_ALERT 1 /* alert */
#define CE_PANIC 0 /* panic */
struct xfs_mount;
#define CE_DEBUG KERN_DEBUG
#define CE_CONT KERN_INFO
#define CE_NOTE KERN_NOTICE
#define CE_WARN KERN_WARNING
#define CE_ALERT KERN_ALERT
#define CE_PANIC KERN_EMERG
void cmn_err(const char *lvl, const char *fmt, ...)
__attribute__ ((format (printf, 2, 3)));
void xfs_fs_cmn_err( const char *lvl, struct xfs_mount *mp,
const char *fmt, ...) __attribute__ ((format (printf, 3, 4)));
void xfs_cmn_err( int panic_tag, const char *lvl, struct xfs_mount *mp,
const char *fmt, ...) __attribute__ ((format (printf, 4, 5)));
extern void cmn_err(int, char *, ...)
__attribute__ ((format (printf, 2, 3)));
extern void assfail(char *expr, char *f, int l);
#define ASSERT_ALWAYS(expr) \

31
fs/xfs/xfs_error.c
View File

@ -152,37 +152,6 @@ xfs_errortag_clearall(xfs_mount_t *mp, int loud)
}
#endif /* DEBUG */
void
xfs_fs_cmn_err(int level, xfs_mount_t *mp, char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
xfs_fs_vcmn_err(level, mp, fmt, ap);
va_end(ap);
}
void
xfs_cmn_err(int panic_tag, int level, xfs_mount_t *mp, char *fmt, ...)
{
va_list ap;
#ifdef DEBUG
xfs_panic_mask |= (XFS_PTAG_SHUTDOWN_CORRUPT | XFS_PTAG_LOGRES);
#endif
if (xfs_panic_mask && (xfs_panic_mask & panic_tag)
&& (level & CE_ALERT)) {
level &= ~CE_ALERT;
level |= CE_PANIC;
cmn_err(CE_ALERT, "XFS: Transforming an alert into a BUG.");
}
va_start(ap, fmt);
xfs_fs_vcmn_err(level, mp, fmt, ap);
va_end(ap);
}
void
xfs_error_report(
const char *tag,

18
fs/xfs/xfs_error.h
View File

@ -136,8 +136,8 @@ extern int xfs_error_test(int, int *, char *, int, char *, unsigned long);
xfs_error_test((tag), (mp)->m_fixedfsid, "expr", __LINE__, __FILE__, \
(rf))))
extern int xfs_errortag_add(int error_tag, xfs_mount_t *mp);
extern int xfs_errortag_clearall(xfs_mount_t *mp, int loud);
extern int xfs_errortag_add(int error_tag, struct xfs_mount *mp);
extern int xfs_errortag_clearall(struct xfs_mount *mp, int loud);
#else
#define XFS_TEST_ERROR(expr, mp, tag, rf) (expr)
#define xfs_errortag_add(tag, mp) (ENOSYS)
@ -162,21 +162,15 @@ extern int xfs_errortag_clearall(xfs_mount_t *mp, int loud);
struct xfs_mount;
extern void xfs_fs_vcmn_err(int level, struct xfs_mount *mp,
char *fmt, va_list ap)
__attribute__ ((format (printf, 3, 0)));
extern void xfs_cmn_err(int panic_tag, int level, struct xfs_mount *mp,
char *fmt, ...)
__attribute__ ((format (printf, 4, 5)));
extern void xfs_fs_cmn_err(int level, struct xfs_mount *mp, char *fmt, ...)
__attribute__ ((format (printf, 3, 4)));
extern void xfs_hex_dump(void *p, int length);
#define xfs_fs_repair_cmn_err(level, mp, fmt, args...) \
xfs_fs_cmn_err(level, mp, fmt " Unmount and run xfs_repair.", ## args)
#define xfs_fs_mount_cmn_err(f, fmt, args...) \
((f & XFS_MFSI_QUIET)? (void)0 : cmn_err(CE_WARN, "XFS: " fmt, ## args))
do { \
if (!(f & XFS_MFSI_QUIET)) \
cmn_err(CE_WARN, "XFS: " fmt, ## args); \
} while (0)
#endif /* __XFS_ERROR_H__ */

2
fs/xfs/xfs_log.c
View File

@ -377,7 +377,7 @@ xfs_log_mount(
cmn_err(CE_NOTE, "XFS mounting filesystem %s", mp->m_fsname);
else {
cmn_err(CE_NOTE,
"!Mounting filesystem \"%s\" in no-recovery mode. Filesystem will be inconsistent.",
"Mounting filesystem \"%s\" in no-recovery mode. Filesystem will be inconsistent.",
mp->m_fsname);
ASSERT(mp->m_flags & XFS_MOUNT_RDONLY);
}

2
fs/xfs/xfs_log_recover.c
View File

@ -3800,7 +3800,7 @@ xlog_recover_finish(
log->l_flags &= ~XLOG_RECOVERY_NEEDED;
} else {
cmn_err(CE_DEBUG,
"!Ending clean XFS mount for filesystem: %s\n",
"Ending clean XFS mount for filesystem: %s\n",
log->l_mp->m_fsname);
}
return 0;