[Bug 191359] [memguard] [panic] Memory modified after free w/MEMGUARD build

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Thu Aug 31 08:15:00 UTC 2017


https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191359

--- Comment #9 from Peter Holm <pho at FreeBSD.org> ---
(In reply to Siva Mahadevan from comment #8)
Hard for me to say it the original panic is still there.
With the same scenario I see:

panic: MemGuard detected double-free of 0xfffffe000075e000
cpuid = 2
time = 1504166229
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe2ebbde5db0
vpanic() at vpanic+0x19c/frame 0xfffffe2ebbde5e30
panic() at panic+0x43/frame 0xfffffe2ebbde5e90
memguard_free() at memguard_free+0x14f/frame 0xfffffe2ebbde5ed0
bufkva_free() at bufkva_free+0xf8/frame 0xfffffe2ebbde5ef0
buf_free() at buf_free+0xd5/frame 0xfffffe2ebbde5f40
brelse() at brelse+0x5c0/frame 0xfffffe2ebbde5fd0
bufdone_finish() at bufdone_finish+0xd4/frame 0xfffffe2ebbde5ff0
bufdone() at bufdone+0xe3/frame 0xfffffe2ebbde6020
biodone() at biodone+0x188/frame 0xfffffe2ebbde6060
g_io_deliver() at g_io_deliver+0x5e4/frame 0xfffffe2ebbde6140
biodone() at biodone+0x188/frame 0xfffffe2ebbde6180
g_io_deliver() at g_io_deliver+0x5e4/frame 0xfffffe2ebbde6260
biodone() at biodone+0x188/frame 0xfffffe2ebbde62a0
g_io_deliver() at g_io_deliver+0x5e4/frame 0xfffffe2ebbde6380
g_disk_done() at g_disk_done+0x1ee/frame 0xfffffe2ebbde6400
biodone() at biodone+0x188/frame 0xfffffe2ebbde6440
dadone() at dadone+0x194b/frame 0xfffffe2ebbde69a0
xpt_done_process() at xpt_done_process+0x35f/frame 0xfffffe2ebbde69e0
xpt_done_td() at xpt_done_td+0x136/frame 0xfffffe2ebbde6a30
fork_exit() at fork_exit+0x13b/frame 0xfffffe2ebbde6ab0

Details @ https://people.freebsd.org/~pho/stress/log/memguard8.txt

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