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Mon, 13 Aug 2018 18:24:26 -0700 (PDT) Received: by localhost.localdomain (Postfix, from userid 1000) id F05E9180BFC; Mon, 13 Aug 2018 22:24:21 -0300 (-03) Date: Mon, 13 Aug 2018 22:24:21 -0300 From: Marcelo Ricardo Leitner To: syzbot Cc: davem@davemloft.net, linux-kernel@vger.kernel.org, linux-sctp@vger.kernel.org, netdev@vger.kernel.org, nhorman@tuxdriver.com, syzkaller-bugs@googlegroups.com, vyasevich@gmail.com Subject: Re: WARNING: refcount bug in sctp_transport_put Message-ID: <20180814012419.GB26909@localhost.localdomain> References: <000000000000fb3b1605735aa815@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <000000000000fb3b1605735aa815@google.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 13, 2018 at 05:55:02PM -0700, syzbot wrote: > ------------[ cut here ]------------ > refcount_t: underflow; use-after-free. > WARNING: CPU: 1 PID: 7203 at lib/refcount.c:187 > refcount_sub_and_test+0x2e7/0x350 lib/refcount.c:187 > Kernel panic - not syncing: panic_on_warn set ... > ... > refcount_dec_and_test+0x1a/0x20 lib/refcount.c:212 > sctp_transport_put+0x76/0x200 net/sctp/transport.c:331 > sctp_generate_heartbeat_event+0x2d7/0x450 net/sctp/sm_sideeffect.c:416 > call_timer_fn+0x242/0x970 kernel/time/timer.c:1326 > expire_timers kernel/time/timer.c:1363 [inline] > __run_timers+0x7a6/0xc70 kernel/time/timer.c:1666 > run_timer_softirq+0x4c/0x70 kernel/time/timer.c:1692 > __do_softirq+0x2e8/0xb17 kernel/softirq.c:292 > invoke_softirq kernel/softirq.c:372 [inline] > irq_exit+0x1d4/0x210 kernel/softirq.c:412 > exiting_irq arch/x86/include/asm/apic.h:527 [inline] > smp_apic_timer_interrupt+0x186/0x730 arch/x86/kernel/apic/apic.c:1055 > apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863 > Interesting, again on heartbeat timer handler. Marcelo