On Mon, Mar 21, 2016 at 05:40:01PM -0300, marcelo.leitner@xxxxxxxxx wrote: > On Mon, Mar 21, 2016 at 04:37:53PM -0400, Neil Horman wrote: > > This BUG halt was recently reported: > > > > PID: 2879 TASK: c16adaa0 CPU: 1 COMMAND: "sctpn" > > #0 [f418dd28] crash_kexec at c04a7d8c > > #1 [f418dd7c] oops_end at c0863e02 > > #2 [f418dd90] do_invalid_op at c040aaca > > #3 [f418de28] error_code (via invalid_op) at c08631a5 > > EAX: f34baac0 EBX: 00000090 ECX: f418deb0 EDX: f5542950 EBP: 00000000 > > DS: 007b ESI: f34ba800 ES: 007b EDI: f418dea0 GS: 00e0 > > CS: 0060 EIP: c046fa5e ERR: ffffffff EFLAGS: 00010286 > > #4 [f418de5c] add_timer at c046fa5e > > #5 [f418de68] sctp_do_sm at f8db8c77 [sctp] > > #6 [f418df30] sctp_primitive_SHUTDOWN at f8dcc1b5 [sctp] > > #7 [f418df48] inet_shutdown at c080baf9 > > #8 [f418df5c] sys_shutdown at c079eedf > > #9 [f418df70] sys_socketcall at c079fe88 > > EAX: ffffffda EBX: 0000000d ECX: bfceea90 EDX: 0937af98 > > DS: 007b ESI: 0000000c ES: 007b EDI: b7150ae4 > > SS: 007b ESP: bfceea7c EBP: bfceeaa8 GS: 0033 > > CS: 0073 EIP: b775c424 ERR: 00000066 EFLAGS: 00000282 > > > > It appears that the side effect that starts the shutdown timer was processed > > multiple times, which can happen as multiple paths can trigger it. This of > > course leads to the BUG halt in add_timer getting called. > > > > Fix seems pretty straightforward, just check before the timer is added if its > > already been started. If it has mod the timer instead to min(current > > expiration, new expiration) > > > > Its been tested but not confirmed to fix the problem, as the issue has only > > occured in production environments where test kernels are enjoined from being > > installed. It appears to be a sane fix to me though. > > > > Signed-off-by: Neil Horman <nhorman@xxxxxxxxxxxxx> > > CC: Vlad Yasevich <vyasevich@xxxxxxxxx> > > CC: "David S. Miller" <davem@xxxxxxxxxxxxx> > > Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx> > > Thanks! > Ping, Dave, Vald? Is something still missing here? Regards Neil -- To unsubscribe from this list: send the line "unsubscribe linux-sctp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
