Am Donnerstag 04 Juli 2013, 22:34:11 schrieb Helge Deller: > When running the LTP testsuite one may hit this kernel BUG() with the > write06 testcase: > > kernel BUG at mm/filemap.c:2023! > CPU: 1 PID: 8614 Comm: writev01 Not tainted 3.10.0-rc7-64bit-c3000+ #6 > IASQ: 0000000000000000 0000000000000000 IAOQ: 00000000401e6e84 > 00000000401e6e88 IIR: 03ffe01f ISR: 0000000010340000 IOR: > 000001fbe0380820 > CPU: 1 CR30: 00000000bef80000 CR31: ffffffffffffffff > ORIG_R28: 00000000bdc192c0 > IAOQ[0]: iov_iter_advance+0x3c/0xc0 > IAOQ[1]: iov_iter_advance+0x40/0xc0 > RP(r2): generic_file_buffered_write+0x204/0x3f0 > Backtrace: > [<00000000401e764c>] generic_file_buffered_write+0x204/0x3f0 > [<00000000401eab24>] __generic_file_aio_write+0x244/0x448 > [<00000000401eadc0>] generic_file_aio_write+0x98/0x150 > [<000000004024f460>] do_sync_readv_writev+0xc0/0x130 > [<000000004025037c>] compat_do_readv_writev+0x12c/0x340 > [<00000000402505f8>] compat_writev+0x68/0xa0 > [<0000000040251d88>] compat_SyS_writev+0x98/0xf8 > > Reason for this crash is a gcc miscompilation in the fault handlers of > pa_memcpy() which return the fault address instead of the copied bytes. > Since this seems to be a generic problem with gcc-4.7.x (and below), it's > better to simplify the fault handlers in pa_memcpy to avoid this problem. Which gcc PR# is that? Greetings, Eike
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