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SubjectRe: Linux 3.7-rc8
From
> Just for info, can you add a "WARN_ON_ONCE()" to handle_bad_sector()
> just so that I see which particular path your kvm load triggers.

On native ia64 (with SLES11 userspace) I see:

WARNING: at block/blk-core.c:1557 generic_make_request_checks+0x680/0xa40()
Hardware name: I8QBH
Modules linked in: usb_storage sg container button usbhid uhci_hcd
ehci_hcd usbcore usb_common fan processor thermal thermal_sys

Call Trace:
[<a000000100016280>] show_stack+0x80/0xa0
sp=e0000003153cf670 bsp=e0000003153c1638
[<a000000100af0310>] dump_stack+0x30/0x50
sp=e0000003153cf840 bsp=e0000003153c1620
[<a00000010007eba0>] warn_slowpath_common+0xc0/0x100
sp=e0000003153cf840 bsp=e0000003153c15d8
[<a00000010007ec20>] warn_slowpath_null+0x40/0x60
sp=e0000003153cf840 bsp=e0000003153c15b0
[<a00000010050dd20>] generic_make_request_checks+0x680/0xa40
sp=e0000003153cf840 bsp=e0000003153c1570
[<a00000010050e110>] generic_make_request+0x30/0x280
sp=e0000003153cf880 bsp=e0000003153c1550
[<a00000010050e4d0>] submit_bio+0x170/0x3c0
sp=e0000003153cf890 bsp=e0000003153c1500
[<a000000100277570>] submit_bh+0x310/0x4e0
sp=e0000003153cf8b0 bsp=e0000003153c14d0
[<a000000100281b80>] block_read_full_page+0x720/0x820
sp=e0000003153cf8b0 bsp=e0000003153c1430
[<a000000100288e10>] blkdev_readpage+0x30/0x60
sp=e0000003153cfcb0 bsp=e0000003153c1408
[<a00000010017a7e0>] read_pages+0x220/0x260
sp=e0000003153cfcb0 bsp=e0000003153c13a0
[<a00000010017a950>] __do_page_cache_readahead+0x130/0x320
sp=e0000003153cfce0 bsp=e0000003153c1310
[<a00000010017ab80>] ra_submit+0x40/0x60
sp=e0000003153cfcf0 bsp=e0000003153c12e0
[<a00000010017b1b0>] ondemand_readahead+0x210/0x580
sp=e0000003153cfcf0 bsp=e0000003153c1278
[<a00000010017b730>] page_cache_sync_readahead+0x90/0x100
sp=e0000003153cfcf0 bsp=e0000003153c1238
[<a000000100162070>] do_generic_file_read+0x770/0xce0
sp=e0000003153cfcf0 bsp=e0000003153c1140
[<a000000100163c40>] generic_file_aio_read+0x260/0x5c0
sp=e0000003153cfcf0 bsp=e0000003153c10d0
[<a00000010020d470>] do_sync_read+0x130/0x240
sp=e0000003153cfd30 bsp=e0000003153c1078
[<a00000010020f070>] vfs_read+0x1b0/0x340
sp=e0000003153cfe20 bsp=e0000003153c1030
[<a00000010020f390>] sys_read+0x90/0xe0
sp=e0000003153cfe20 bsp=e0000003153c0fb0
[<a00000010000bc40>] ia64_ret_from_syscall+0x0/0x20
sp=e0000003153cfe30 bsp=e0000003153c0fb0
[<a000000000040720>] __kernel_syscall_via_break+0x0/0x20
sp=e0000003153d0000 bsp=e0000003153c0fb0


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