2014-04-29 19:27 GMT+08:00 Petr Tesarik <[email protected]>: > > It will show an incorrect register dump, but the backtrace continues. > For example: >
Hi Petr, The back trace looks good. How did you know the register dump is incorrect? At least the value of RSP saved in NMI stack seemed to be good, RSP: ffff880232b2ff18 Recently, I'm working on a core file analysis, and found crash tool couldn't give the correct NMI back trace. But I can find right stack trace by using IST pointer. I'm wondering whether your patch could work for my cases. May I can try your fix after it is ready. > > PID: 0 TASK: ffff880232b2c440 CPU: 7 COMMAND: "kworker/0:1" > #0 [ffff88023fdc7e40] crash_nmi_callback at ffffffff8102428f > #1 [ffff88023fdc7e50] notifier_call_chain at ffffffff81461ec7 > #2 [ffff88023fdc7e80] __atomic_notifier_call_chain at ffffffff81461f0d > #3 [ffff88023fdc7e90] notify_die at ffffffff81461f5d > #4 [ffff88023fdc7ec0] default_do_nmi at ffffffff8145f3a7 > #5 [ffff88023fdc7ee0] do_nmi at ffffffff8145f5d8 > #6 [ffff88023fdc7ef0] restart_nmi at ffffffff8145eb2d > [exception RIP: mwait_idle+423] > RIP: ffffffff8100b217 RSP: ffff880232b2ff18 RFLAGS: 00000246 > RAX: 0000000000000010 RBX: 0000000000000010 RCX: 0000000000000246 > RDX: ffff880232b2ff18 RSI: 0000000000000018 RDI: 0000000000000001 > RBP: ffffffff8100b217 R8: ffffffff8100b217 R9: 0000000000000018 > R10: ffff880232b2ff18 R11: 0000000000000246 R12: ffffffffffffffff > R13: ffffffff81d36108 R14: ffff880232b2ffd8 R15: 0000000000000000 > ORIG_RAX: 0000000000000000 CS: 0010 SS: 0018 > --- <NMI exception stack> --- > #7 [ffff880232b2ff18] mwait_idle at ffffffff8100b217 > #8 [ffff880232b2ff30] cpu_idle at ffffffff81002126 > > If there is a nested NMI, reading the code suggests crash may loop again > to the NMI stack, but I don't have a sample dump file ATM. > > Petr T > > -- > Crash-utility mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/crash-utility > -- ------------------ Oliver Yang
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