# Monitor the system for dropped packets and proudce a report of drop locations and counts import os import sys sys.path.append(os.environ['PERF_EXEC_PATH'] + \ '/scripts/python/Perf-Trace-Util/lib/Perf/Trace') from perf_trace_context import * from Core import * from Util import * drop_log = {} kallsyms = [] def get_kallsyms_table(): global kallsyms try: f = open("/proc/kallsyms", "r") except: return for line in f: loc = int(line.split()[0], 16) name = line.split()[2] kallsyms.append((loc, name)) kallsyms.sort() def get_sym(sloc): loc = int(sloc) # Invariant: kallsyms[i][0] <= loc for all 0 <= i <= start # kallsyms[i][0] > loc for all end <= i < len(kallsyms) start, end = -1, len(kallsyms) while end != start + 1: pivot = (start + end) // 2 if loc < kallsyms[pivot][0]: end = pivot else: start = pivot # Now (start == -1 or kallsyms[start][0] <= loc) # and (start == len(kallsyms) - 1 or loc < kallsyms[start + 1][0]) if start >= 0: symloc, name = kallsyms[start] return (name, loc - symloc) else: return (None, 0) def print_drop_table(): print "%25s %25s %25s" % ("LOCATION", "OFFSET", "COUNT") for i in drop_log.keys(): (sym, off) = get_sym(i) if sym == None: sym = i print "%25s %25s %25s" % (sym, off, drop_log[i]) def trace_begin(): print "Starting trace (Ctrl-C to dump results)" def trace_end(): print "Gathering kallsyms data" get_kallsyms_table() print_drop_table() # called from perf, when it finds a correspoinding event def skb__kfree_skb(name, context, cpu, sec, nsec, pid, comm, callchain, skbaddr, location, protocol): slocation = str(location) try: drop_log[slocation] = drop_log[slocation] + 1 except: drop_log[slocation] = 1 c'>logtreecommitdiff
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authorAndrei Vagin <avagin@openvz.org>2017-01-04 19:28:14 -0800
committerEric W. Biederman <ebiederm@xmission.com>2017-01-10 13:34:56 +1300
commitadd7c65ca426b7a37184dd3d2172394e23d585d6 (patch)
tree28b08b519540041b06ed0ab0b1c005076b932e8e /security/smack/smack_access.c
parent75422726b0f717d67db3283c2eb5bc14fa2619c5 (diff)
pid: fix lockdep deadlock warning due to ucount_lock
========================================================= [ INFO: possible irq lock inversion dependency detected ] 4.10.0-rc2-00024-g4aecec9-dirty #118 Tainted: G W --------------------------------------------------------- swapper/1/0 just changed the state of lock: (&(&sighand->siglock)->rlock){-.....}, at: [<ffffffffbd0a1bc6>] __lock_task_sighand+0xb6/0x2c0 but this lock took another, HARDIRQ-unsafe lock in the past: (ucounts_lock){+.+...} and interrupts could create inverse lock ordering between them. other info that might help us debug this: Chain exists of: &(&sighand->siglock)->rlock --> &(&tty->ctrl_lock)->rlock --> ucounts_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(ucounts_lock); local_irq_disable(); lock(&(&sighand->siglock)->rlock); lock(&(&tty->ctrl_lock)->rlock); <Interrupt> lock(&(&sighand->siglock)->rlock); *** DEADLOCK *** This patch removes a dependency between rlock and ucount_lock. Fixes: f333c700c610 ("pidns: Add a limit on the number of pid namespaces") Cc: stable@vger.kernel.org Signed-off-by: Andrei Vagin <avagin@openvz.org> Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'security/smack/smack_access.c')