Darrick J. Wong wrote:
> On Mon, Sep 04, 2017 at 09:19:41PM +0900, Tetsuo Handa wrote:
> > Hello.
> >
> > I hit kmemcheck splat using linux-next-20170901.
>
> What was running at the time?
>
> Would be nice to know what log vector that was...
Nothing special. Just booted CentOS 7 using KMEMCHECK=y linux-next-20170901 kernel.
>
> --D
>
> > [ 1360.354052] WARNING: kmemcheck: Caught 32-bit read from uninitialized memory (ffffa17673526960)
> > [ 1360.354053] 00000000000000006a1004080000000000000000000000000000000000000000
> > [ 1360.354059] u u u u u u u u i i i i i i i i u u u u u u u u u u u u u u u u
> > [ 1360.354063] ^
> > [ 1360.354080] RIP: 0010:xlog_write+0x378/0x890 [xfs]
> > [ 1360.354080] RSP: 0018:ffffafeac12b7cf0 EFLAGS: 00010202
> > [ 1360.354081] RAX: ffffafeac1808234 RBX: 0000000000000038 RCX: 000000000000000c
> > [ 1360.354082] RDX: 000000000000000e RSI: ffffa17673526960 RDI: ffffafeac180823c
> > [ 1360.354082] RBP: ffffafeac12b7d98 R08: 0000000000000000 R09: 0000000000000000
> > [ 1360.354083] R10: ffffa176737f8000 R11: 0000000000000000 R12: 0000000000000038
> > [ 1360.354083] R13: 0000000000000002 R14: 0000000000000000 R15: ffffa17673526900
> > [ 1360.354084] FS: 0000000000000000(0000) GS:ffffffffb0c30000(0000) knlGS:0000000000000000
> > [ 1360.354085] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [ 1360.354085] CR2: ffffa17674a66320 CR3: 0000000135c77003 CR4: 00000000000606f0
> > [ 1360.354133] xlog_write+0x378/0x890 [xfs]
> > [ 1360.354142] xlog_cil_push+0x1f4/0x370 [xfs]
> > [ 1360.354151] xlog_cil_push_work+0xd/0x10 [xfs]
> > [ 1360.354207] process_one_work+0x1cd/0x330
> > [ 1360.354208] worker_thread+0x222/0x3e0
> > [ 1360.354209] kthread+0xfe/0x130
> > [ 1360.354212] ret_from_fork+0x25/0x30
> > [ 1360.354213] 0xffffffffffffffff
> >
> > # ./scripts/faddr2line fs/xfs/xfs.ko xlog_write+0x378/0x890
> > xlog_write+0x378/0x890:
> > __inline_memcpy at /data/linux-next/./arch/x86/include/asm/string_64.h:13
> > (inlined by) xlog_write at /data/linux-next/fs/xfs/xfs_log.c:2479
> >
> > ASSERT(copy_len >= 0);
> > 3136: 0f 88 77 01 00 00 js 32b3 <xlog_write+0x4d3>
> > if (copy_len > 0) {
> > 313c: 0f 84 d6 02 00 00 je 3418 <xlog_write+0x638>
> > memcpy(ptr, reg->i_addr + copy_off, copy_len);
> > 3142: 48 63 da movslq %edx,%rbx
> > 3145: 49 63 f6 movslq %r14d,%rsi
> > 3148: 48 89 c7 mov %rax,%rdi
> > "1:\ttestb $1,%b4\n\t"
> > "je 2f\n\t"
> > "movsb\n"
> > "2:"
> > : "=&c" (d0), "=&D" (d1), "=&S" (d2)
> > : "0" (n / 4), "q" (n), "1" ((long)to), "2" ((long)from)
> > 314b: 48 89 da mov %rbx,%rdx
> > 314e: 48 03 31 add (%rcx),%rsi
> > 3151: 48 c1 ea 02 shr $0x2,%rdx
> > asm volatile("rep ; movsl\n\t"
> > 3155: 48 89 d1 mov %rdx,%rcx
> > 3158: f3 a5 rep movsl %ds:(%rsi),%es:(%rdi) // <= xlog_write+0x378/0x890
> > 315a: f6 c3 02 test $0x2,%bl
> > 315d: 74 02 je 3161 <xlog_write+0x381>
> > 315f: 66 a5 movsw %ds:(%rsi),%es:(%rdi)
> > 3161: f6 c3 01 test $0x1,%bl
> > 3164: 74 01 je 3167 <xlog_write+0x387>
> > 3166: a4 movsb %ds:(%rsi),%es:(%rdi)
> > 3167: 8b 55 c4 mov -0x3c(%rbp),%edx
> > *len -= bytes;
> > --
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