Date: Sun, 10 Jan 2016 22:28:31 -0800 From: Colin Percival <cperciva@freebsd.org> To: freebsd-xen@freebsd.org Subject: recent disk-related breakage Message-ID: <56934B8F.8050503@freebsd.org>
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Some time in early December, disk I/O broke. The EC2 image built from r291495 works fine; the EC2 image built from r292413 is broken. Symptoms: 1. growfs reports "superblock not recognized" 2. fsck reports lots of "UNKNOWN FILE TYPE"s and after a few seconds provokes "panic: XEN disk driver data cannot cross a page boundary" xbd_mksegarray() at xbd_mksegarray+0x4b/frame 0xfffffe0f4dadb420 xbd_queue_cb() at xbd_queue_cb+0x1e8/frame 0xfffffe0f4dadb490 bus_dmamap_load_bio() at bus_dmamap_load_bio+0xad/frame 0xfffffe0f4dadb4f0 xbd_startio() at xbd_startio+0x194/frame 0xfffffe0f4dadb530 xbd_strategy() at xbd_strategy+0x6a/frame 0xfffffe0f4dadb560 g_disk_start() at g_disk_start+0x37c/frame 0xfffffe0f4dadb5d0 g_io_request() at g_io_request+0x39d/frame 0xfffffe0f4dadb630 g_part_start() at g_part_start+0x2b5/frame 0xfffffe0f4dadb6b0 g_io_request() at g_io_request+0x39d/frame 0xfffffe0f4dadb710 g_io_request() at g_io_request+0x39d/frame 0xfffffe0f4dadb770 g_dev_strategy() at g_dev_strategy+0x171/frame 0xfffffe0f4dadb7b0 physio() at physio+0x440/frame 0xfffffe0f4dadb850 devfs_read_f() at devfs_read_f+0xe7/frame 0xfffffe0f4dadb8b0 dofileread() at dofileread+0x98/frame 0xfffffe0f4dadb900 kern_readv() at kern_readv+0x68/frame 0xfffffe0f4dadb950 sys_read() at sys_read+0x60/frame 0xfffffe0f4dadb9a0 Does anyone remember touching any relevant bits of code in that timeframe? -- Colin Percival Security Officer Emeritus, FreeBSD | The power to serve Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid
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