Date: Mon, 16 May 2016 09:51:01 +0200 From: Hans Petter Selasky <hps@selasky.org> To: "K. Macy" <kmacy@freebsd.org>, "freebsd-fs@FreeBSD.org" <freebsd-fs@freebsd.org>, Alexander Motin <mav@FreeBSD.org> Subject: Re: bug in umass? Message-ID: <d5d2e8c9-2b3b-f96b-34c1-f5b4a865eab9@selasky.org> In-Reply-To: <CAHM0Q_OYGmRmG39v=688f7f8ARs7avSZHBk8y-BSJkfzzYUzdA@mail.gmail.com> References: <CAHM0Q_OYGmRmG39v=688f7f8ARs7avSZHBk8y-BSJkfzzYUzdA@mail.gmail.com>
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Hi Alexander, Does dumping core on a USB stick from KDB require any threads? From the USB point of view we are doing polling in "umass_cam_poll()". --HPS On 05/16/16 07:02, K. Macy wrote: > I'm not able to complete a coredump in i915 to a USB key. The > backtrace in the log looks like a bug in umass. > > > May 15 21:57:10 beastie kernel: cmap[0]=0 cmap[1]=7f0000 cmap[2]=7f00 > cmap[3]=c4a000 > May 15 21:57:10 beastie kernel: end FB_INFO > May 15 21:57:10 beastie kernel: drmn0: fb0: inteldrmfb frame buffer device > May 15 21:57:10 beastie kernel: ..3% > May 15 21:58:16 beastie syslogd: kernel boot file is /boot/kernel/kernel > May 15 21:58:16 beastie kernel: trap_fatal() at trap_fatal+0x2d/frame > 0xfffffe01e2fd6350 > May 15 21:58:16 beastie kernel: trap() at trap+0xc48/frame 0xfffffe01e2fd6690 > May 15 21:58:16 beastie kernel: trap_check() at trap_check+0x4a/frame > 0xfffffe01e2fd66b0 > May 15 21:58:16 beastie kernel: calltrap() at calltrap+0x8/frame > 0xfffffe01e2fd66b0 > May 15 21:58:16 beastie kernel: --- trap 0x9, rip = > 0xffffffff80f5a950, rsp = 0xfffffe01e2fd6780, rbp = 0xfffffe01e2fd6810 > --- > May 15 21:58:16 beastie kernel: __mtx_lock_flags() at > __mtx_lock_flags+0xd0/frame 0xfffffe01e2fd6810 > May 15 21:58:16 beastie kernel: xpt_done_process() at > xpt_done_process+0x495/frame 0xfffffe01e2fd68c0 > May 15 21:58:16 beastie kernel: xpt_done_td() at > xpt_done_td+0x1c0/frame 0xfffffe01e2fd6930 > May 15 21:58:16 beastie kernel: fork_exit() at fork_exit+0x13b/frame > 0xfffffe01e2fd69b0 > May 15 21:58:16 beastie kernel: fork_trampoline() at > fork_trampoline+0xe/frame 0xfffffe01e2fd69b0 > May 15 21:58:16 beastie kernel: --- trap 0, rip = 0, rsp = 0, rbp = 0 --- >
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