On Mon, Apr 11, 2016 at 11:32 AM, Andrey Ryabinin <[email protected]> wrote: > > > On 04/11/2016 12:03 PM, Dmitry Vyukov wrote: >> On Mon, Apr 11, 2016 at 10:52 AM, Andrey Ryabinin >> <[email protected]> wrote: >>> >>> >>> On 04/11/2016 11:28 AM, Dmitry Vyukov wrote: >>>> Hello, >>>> >>>> I've got the following WARNING while running syzkaller fuzzer: >>>> >>>> CPA ffff880054118000: bad pte after revert 8000000054118363 >>>> ------------[ cut here ]------------ >>>> WARNING: CPU: 2 PID: 1503 at arch/x86/mm/pageattr-test.c:226 >>>> pageattr_test+0xa6c/0xd10 >>>> NOT PASSED. Please report. >>>> Modules linked in: >>>> CPU: 2 PID: 1503 Comm: pageattr-test Not tainted 4.6.0-rc2+ #346 >>>> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs >>>> 01/01/2011 >>>> ffffffff87eb25c0 ffff88003b627a70 ffffffff82c8b17f ffffffff81490b58 >>>> fffffbfff0fd64b8 ffff88003b627ae8 0000000000000000 ffffffff86a77e00 >>>> ffffffff8129487c 0000000000000009 ffff88003b627ab8 ffffffff8136639f >>>> Call Trace: >>>> [< inline >] __dump_stack lib/dump_stack.c:15 >>>> [<ffffffff82c8b17f>] dump_stack+0x12e/0x18f lib/dump_stack.c:51 >>>> [<ffffffff8136639f>] __warn+0x19f/0x1e0 kernel/panic.c:512 >>>> [<ffffffff8136648c>] warn_slowpath_fmt+0xac/0xd0 kernel/panic.c:527 >>>> [<ffffffff8129487c>] pageattr_test+0xa6c/0xd10 >>>> arch/x86/mm/pageattr-test.c:226 >>>> [<ffffffff81294b3b>] do_pageattr_test+0x1b/0x60 >>>> arch/x86/mm/pageattr-test.c:240 >>>> [<ffffffff813cde7f>] kthread+0x23f/0x2d0 drivers/block/aoe/aoecmd.c:1303 >>> >>> It seems, that your script is buggy. It should be kthread() from >>> kernel/kthread.c here. >> >> >> I probably used a non-matching vmlinux for symbolization. > > No, it's a bug in your script. To find out source location, it uses > 'function_name + offset' instead of absolute address. > We have 2 kthread() functions in kernel and this confuses you script. > > > E.g. my vmlinux : > $ addr2line -i -e vmlinux ffffffff811b5290 > /home/andrew/linux/kernel/kthread.c:178 > $ addr2line -i -e kasan_conf/vmlinux ffffffff825c7240 > /home/andrew/linux/drivers/block/aoe/aoecmd.c:1289 > > > $ echo '[<ffffffff811b5290>] kthread+0x00/0x00' | python kasan_symbolize.py > vmlinux > [<ffffffff811b5290>] kthread+0x00/0x00 drivers/block/aoe/aoecmd.c:462 > $ echo '[<ffffffff825c7240>] kthread+0x00/0x00' | python kasan_symbolize.py > vmlinux > [<ffffffff825c7240>] kthread+0x00/0x00 drivers/block/aoe/aoecmd.c:462
Agree. Filed https://github.com/google/sanitizers/issues/668 Thanks! >> Please >> check the raw report below if the symbolized one does not make sense. >> >> \/\/\/\/\/\/\/\/ >> >>>> For the repcord, full syzkaller log: >>>> https://gist.githubusercontent.com/dvyukov/323ff7275c5ac38156cb40caeacac057/raw/0836f8dd81024e441f81caebdcb73ca1221aef97/gistfile1.txt
