I thought I'd fixed it... I rebooted in 32 bit mode and the machine has been up for three days without a kernel panic or freeze. Sadly it crashed again, in the middle of the night, when nobody was using it - NVIDIA again, of course, but it was unusual in that nobody was using it at the time.
The watchdog time error looks like something a bit different - has anybody else seen this?
I've now set it to always boot in 32 bit mode.. and I've not had flash running for a long time...
Here's the crash - out of the blue:
Jul 5 15:36:36 Eve-2 kernel[0]: USBMSC Identifier (non-unique): 89C40FFFFFFF 0x152d 0x2329 0x100
Jul 6 00:45:11 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:45:11 Eve-2 kernel[0]: IOVendorGLContext::ReportGPURestart
Jul 6 00:45:12 Eve-2 kernel[0]: 0000006e
Jul 6 00:45:12 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:45:12 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:45:12 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:45:12 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:45:30 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:45:30 Eve-2 kernel[0]: 0000006e
Jul 6 00:45:30 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:45:30 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:45:30 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:45:30 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:46:00 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:46:00 Eve-2 kernel[0]: 0000006e
Jul 6 00:46:00 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:46:00 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:46:00 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:46:00 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:46:26 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:46:26 Eve-2 kernel[0]: 0000006e
Jul 6 00:46:26 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:46:26 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:46:26 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:46:26 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:46:45 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:46:45 Eve-2 kernel[0]: 0000006e
Jul 6 00:46:45 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:46:45 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:46:45 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:46:45 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:47:04 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:47:04 Eve-2 kernel[0]: 0000006e
Jul 6 00:47:04 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:47:04 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:47:04 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:47:04 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:47:24 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:47:24 Eve-2 kernel[0]: 0000006e
Jul 6 00:47:24 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:47:24 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:47:24 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:47:24 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:47:44 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:47:44 Eve-2 kernel[0]: 0000006e
Jul 6 00:47:44 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:47:44 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:47:44 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:47:44 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:48:17 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:48:17 Eve-2 kernel[0]: 0000006e
Jul 6 00:48:17 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:48:17 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:48:17 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:48:17 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:49:00 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:49:00 Eve-2 kernel[0]: NVDA(OpenGL): Channel timeout!
Jul 6 00:49:00 Eve-2 kernel[0]: 0000006e
Jul 6 00:49:00 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:49:00 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:49:00 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:49:00 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:49:45 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:49:45 Eve-2 kernel[0]: NVDA(OpenGL): Channel timeout!
Jul 6 00:49:45 Eve-2 kernel[0]: 0000006e
Jul 6 00:49:45 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:49:45 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:49:45 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:49:45 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:50:07 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:50:08 Eve-2 kernel[0]: 0000006e
Jul 6 00:50:08 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:50:08 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:50:08 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:50:08 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:50:34 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:50:34 Eve-2 kernel[0]: 0000006e
Jul 6 00:50:34 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:50:34 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:50:34 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:50:34 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:51:01 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:51:01 Eve-2 kernel[0]: 0000006e
Jul 6 00:51:01 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:51:01 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:51:01 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:51:01 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:51:22 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:51:22 Eve-2 kernel[0]: 0000006e
Jul 6 00:51:22 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:51:22 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:51:22 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:51:22 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:51:55 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:51:55 Eve-2 kernel[0]: 0000006e
Jul 6 00:51:55 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:51:55 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:51:55 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:51:55 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:52:16 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:52:16 Eve-2 kernel[0]: 0000006e
Jul 6 00:52:16 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:52:16 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:52:16 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:52:16 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:52:45 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:52:45 Eve-2 kernel[0]: 0000006e
Jul 6 00:52:45 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:52:45 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:52:45 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:52:45 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:53:14 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:53:14 Eve-2 kernel[0]: 0000006e
Jul 6 00:53:14 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:53:14 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:53:14 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:53:14 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:53:33 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:53:33 Eve-2 kernel[0]: 0000006e
Jul 6 00:53:33 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:53:33 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:53:33 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:53:33 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:54:07 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:54:08 Eve-2 kernel[0]: 0000006e
Jul 6 00:54:08 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:54:08 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:54:08 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:54:08 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:54:29 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:54:29 Eve-2 kernel[0]: 0000006e
Jul 6 00:54:29 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:54:29 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:54:29 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:54:29 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:55:02 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:55:02 Eve-2 kernel[0]: 0000006e
Jul 6 00:55:02 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:55:02 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:55:02 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:55:02 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:55:24 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:55:24 Eve-2 kernel[0]: 0000006e
Jul 6 00:55:24 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:55:24 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:55:24 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:55:24 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:55:52 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:55:53 Eve-2 kernel[0]: 0000006e
Jul 6 00:55:53 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:55:53 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:55:53 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:55:53 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:56:18 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:56:18 Eve-2 kernel[0]: 0000006e
Jul 6 00:56:18 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:56:18 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:56:18 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:56:18 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:56:37 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:56:37 Eve-2 kernel[0]: 0000006e
Jul 6 00:56:37 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:56:37 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:56:37 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:56:37 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:57:11 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:57:12 Eve-2 kernel[0]: 0000006e
Jul 6 00:57:12 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:57:12 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:57:12 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:57:12 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:57:30 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 00:57:30 Eve-2 kernel[0]: 0000006e
Jul 6 00:57:30 Eve-2 kernel[0]: 00000010 0000502d 00000472 00000000
Jul 6 00:57:30 Eve-2 kernel[0]: 0000047a 0000022c 00000001 0000001f
Jul 6 00:57:30 Eve-2 kernel[0]: 00000000 00000000 00100101
Jul 6 00:57:30 Eve-2 kernel[0]: 00000000 00000000
Jul 6 00:57:45 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = GR: SW Notify Error
Jul 6 00:57:45 Eve-2 kernel[0]: 0000006e
Jul 6 00:57:45 Eve-2 kernel[0]: 00200000 0000502d 00000472 00000040
Jul 6 00:57:45 Eve-2 kernel[0]: 0000047a 000002ac 00000003 0000001f
Jul 6 00:57:45 Eve-2 kernel[0]: 00000000 00000000 01be0003
Jul 6 00:57:45 Eve-2 kernel[0]: 00000040 00000000
Jul 6 00:59:37 Eve-2 kernel[0]: NVDA(OpenGL): Channel timeout!
Jul 6 01:00:30 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 01:00:30 Eve-2 kernel[0]: IOVendorGLContext::ReportGPURestart
Jul 6 01:00:31 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = GR: SW Notify Error
Jul 6 01:00:31 Eve-2 kernel[0]: 0000006e
Jul 6 01:00:31 Eve-2 kernel[0]: 00200000 0000502d 00000472 00000040
Jul 6 01:00:31 Eve-2 kernel[0]: 0000047a 000002ac 00000003 0000001f
Jul 6 01:00:31 Eve-2 kernel[0]: 00000000 00000000 01200001
Jul 6 01:00:31 Eve-2 kernel[0]: 00000040 00000000
Jul 6 01:00:31 Eve-2 kernel[0]: 0000006e
Jul 6 01:00:31 Eve-2 kernel[0]: 00200000 0000502d 00000472 00000040
Jul 6 01:00:31 Eve-2 kernel[0]: 0000047a 000002ac 00000003 0000001f
Jul 6 01:00:31 Eve-2 kernel[0]: 00000000 00000000 00000000
Jul 6 01:00:31 Eve-2 kernel[0]: 00000040 00000000
Jul 6 01:00:31 Eve-2 kernel[0]: 0000006e
Jul 6 01:00:31 Eve-2 kernel[0]: 00200000 0000502d 00000472 00000040
Jul 6 01:00:31 Eve-2 kernel[0]: 0000047a 000002ac 00000003 0000001f
Jul 6 01:00:31 Eve-2 kernel[0]: 00000000 00000000 01900403
Jul 6 01:00:31 Eve-2 kernel[0]: 00000040 00000000
Jul 6 01:00:31 Eve-2 kernel[0]: 0000006e
Jul 6 01:00:31 Eve-2 kernel[0]: 00200000 0000502d 00000472 00000040
Jul 6 01:00:31 Eve-2 kernel[0]: 0000047a 000002ac 00000003 0000001f
Jul 6 01:00:31 Eve-2 kernel[0]: 00000000 00000000 01900403
Jul 6 01:00:31 Eve-2 kernel[0]: 00000040 00000000
Jul 6 01:00:31 Eve-2 kernel[0]: 0000006e
Jul 6 01:00:31 Eve-2 kernel[0]: 00200000 00000000 00000000 00000001
Jul 6 01:00:31 Eve-2 kernel[0]: 00000000 00000000 00000000 00000004
Jul 6 01:00:31 Eve-2 kernel[0]: 00000000 00000000 00000000
Jul 6 01:00:31 Eve-2 kernel[0]: 00000001 00000000
Jul 6 01:00:42 Eve-2 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error
Jul 6 01:01:02 Eve-2 kernel[0]: NVDA(OpenGL): Channel timeout!
Jul 6 01:01:02 Eve-2 kernel[0]: 0000006e
Jul 6 01:01:02 Eve-2 kernel[0]: 00000010 00008297 00000474 00000000
Jul 6 01:01:02 Eve-2 kernel[0]: 0000047e 00001528 00000000 00000004
Jul 6 01:01:02 Eve-2 kernel[0]: 00000000 00000000 00000000
Jul 6 01:01:02 Eve-2 kernel[0]: 00000000 00000000
Jul 6 01:01:02 Eve-2 kernel[0]: 0000006e
Jul 6 01:01:02 Eve-2 kernel[0]: 00000010 00008297 00000474 00000000
Jul 6 01:01:02 Eve-2 kernel[0]: 0000047e 00001528 00000000 00000004
Jul 6 01:01:02 Eve-2 kernel[0]: 00000000 00000000 00000000
Jul 6 01:01:02 Eve-2 kernel[0]: 00000000 00000000
Jul 6 01:03:28 localhost kernel[0]: Darwin Kernel Version 11.4.0: Mon Apr 9 19:32:15 PDT 2012; root:xnu-1699.26.8~1/RELEASE_X86_64