My swap is an LVM LV on top of a raid10 backed bcache device. I have had
a few oopses in recent months but have not been able to pin down the
cause. I have begun to suspect that the swap may be involved. The SSDs
in that raid10 are junky OCZ Agility3s. They seem to have a reputation
for periodic freezes or long pauses. Could it be that the kernel wanted
to write to the swap but couldn't because the SSDs were in a long pause
and that caused mempool_alloc to return null which then blew up the world?
Is there any reason not to put swap on top of a bcache device?
--Larkin
On 8/13/2014 4:25 PM, Slava Pestov wrote:
> Indeed it looks like iter is NULL. I see the bug is still present in
> the latest dev branch. The problem is that we're not checking the
> return value of mempoool_alloc(), which may be NULL if we pass
> GFP_NOWAIT.
>
> On Wed, Aug 13, 2014 at 2:21 PM, Larkin Lowrey
> <llowrey@xxxxxxxxxxxxxxxxx> wrote:
>> Here's the dissassembly of bch_btree_node_read_done. The offending line
>> is 207 and the instruction is at offset 76.
>>
>> --Larkin
>>
>> 199 void bch_btree_node_read_done(struct btree *b)
>> 200 {
>> 0x00000000000065b0 <+0>: callq 0x65b5 <bch_btree_node_read_done+5>
>> 0x00000000000065b5 <+5>: push %rbp
>> 0x00000000000065b8 <+8>: mov %rsp,%rbp
>> 0x00000000000065bb <+11>: push %r15
>> 0x00000000000065bd <+13>: push %r14
>> 0x00000000000065bf <+15>: push %r13
>> 0x00000000000065c1 <+17>: push %r12
>> 0x00000000000065c3 <+19>: mov %rdi,%r12
>> 0x00000000000065c6 <+22>: push %rbx
>>
>> 201 const char *err = "bad btree header";
>> 0x0000000000006800 <+592>: mov $0x0,%rdx
>>
>> 202 struct bset *i = btree_bset_first(b);
>> 203 struct btree_iter *iter;
>> 204
>> 205 iter = mempool_alloc(b->c->fill_iter, GFP_NOWAIT);
>> 0x00000000000065b6 <+6>: xor %esi,%esi
>> 0x00000000000065c7 <+23>: mov 0x80(%rdi),%rax
>> 0x00000000000065d5 <+37>: mov 0xcb58(%rax),%rdi
>> 0x00000000000065dc <+44>: callq 0x65e1 <bch_btree_node_read_done+49>
>> 0x00000000000065e9 <+57>: mov %rax,%r13
>>
>> 206 iter->size = b->c->sb.bucket_size / b->c->sb.block_size;
>> 0x00000000000065e1 <+49>: mov 0x80(%r12),%rsi
>> 0x00000000000065ec <+60>: xor %edx,%edx
>> 0x00000000000065ee <+62>: movzwl 0x432(%rsi),%eax
>> 0x00000000000065f5 <+69>: divw 0x430(%rsi)
>> 0x0000000000006604 <+84>: movzwl %ax,%eax
>> 0x0000000000006607 <+87>: mov %rax,0x0(%r13)
>>
>> 207 iter->used = 0;
>> 0x00000000000065fc <+76>: movq $0x0,0x8(%r13)
>>
>> 208
>> 209 #ifdef CONFIG_BCACHE_DEBUG
>> 210 iter->b = &b->keys;
>> 211 #endif
>> 212
>> 213 if (!i->seq)
>> 0x000000000000660b <+91>: mov 0x10(%rbx),%rax
>> 0x000000000000660f <+95>: test %rax,%rax
>> 0x0000000000006612 <+98>: je 0x6800 <bch_btree_node_read_done+592>
>>
>> 214 goto err;
>> 215
>> 216 for (;
>> 0x000000000000664d <+157>: cmp %r9d,%ecx
>> 0x0000000000006650 <+160>: jae 0x6882 <bch_btree_node_read_done+722>
>> 0x0000000000006744 <+404>: cmp %r9d,%r10d
>> 0x0000000000006747 <+407>: jae 0x6898 <bch_btree_node_read_done+744>
>>
>> 217 b->written < btree_blocks(b) && i->seq ==
>> b->keys.set[0].data->seq;
>> 0x0000000000006618 <+104>: mov 0x80(%r12),%rsi
>> 0x0000000000006625 <+117>: movzwl 0xc0(%r12),%edi
>> 0x000000000000662e <+126>: mov 0x108(%r12),%r8
>> 0x0000000000006636 <+134>: movzwl 0xde2(%rsi),%ecx
>> 0x0000000000006644 <+148>: mov %rdx,%r9
>> 0x0000000000006647 <+151>: shr %cl,%r9
>> 0x000000000000664a <+154>: movzwl %di,%ecx
>> 0x0000000000006656 <+166>: cmp 0x10(%r8),%rax
>> 0x000000000000665a <+170>: jne 0x6882 <bch_btree_node_read_done+722>
>> 0x000000000000670f <+351>: mov %rdx,%r9
>> 0x000000000000672a <+378>: movzwl 0xde2(%rsi),%ecx
>> 0x0000000000006738 <+392>: shr %cl,%r9
>> 0x000000000000674d <+413>: mov 0x10(%r8),%rcx
>> 0x0000000000006751 <+417>: cmp %rcx,0x10(%rbx)
>> 0x0000000000006755 <+421>: jne 0x6898 <bch_btree_node_read_done+744>
>> 0x0000000000006892 <+738>: add %r8,%rbx
>> 0x0000000000006895 <+741>: nopl (%rax)
>>
>> 218 i = write_block(b)) {
>> 219 err = "unsupported bset version";
>> 0x00000000000069c0 <+1040>: mov $0x0,%rdx
>> 0x00000000000069c7 <+1047>: jmpq 0x6807 <bch_btree_node_read_done+599>
>> 0x00000000000069cc <+1052>: nopl 0x0(%rax)
>>
>> 220 if (i->version > BCACHE_BSET_VERSION)
>> 0x0000000000006660 <+176>: mov 0x18(%rbx),%r10d
>> 0x0000000000006664 <+180>: cmp $0x1,%r10d
>> 0x0000000000006668 <+184>: ja 0x69c0
>> <bch_btree_node_read_done+1040>
>> 0x000000000000666e <+190>: movzwl 0x430(%rsi),%r11d
>> 0x0000000000006676 <+198>: jmpq 0x6769 <bch_btree_node_read_done+441>
>> 0x000000000000667b <+203>: nopl 0x0(%rax,%rax,1)
>> 0x000000000000675b <+427>: mov 0x18(%rbx),%r10d
>> 0x000000000000675f <+431>: cmp $0x1,%r10d
>> 0x0000000000006763 <+435>: ja 0x69c0
>> <bch_btree_node_read_done+1040>
>>
>> 221 goto err;
>> 222
>> 223 err = "bad btree header";
>> 224 if (b->written + set_blocks(i, block_bytes(b->c)) >
>> 0x0000000000006769 <+441>: mov 0x1c(%rbx),%eax
>> 0x000000000000676c <+444>: mov %r11,%rcx
>> 0x000000000000676f <+447>: xor %edx,%edx
>> 0x0000000000006771 <+449>: shl $0x9,%rcx
>> 0x0000000000006775 <+453>: movzwl %di,%edi
>> 0x0000000000006778 <+456>: mov %r9d,%r9d
>> 0x000000000000677b <+459>: and $0x1fffe00,%ecx
>> 0x0000000000006781 <+465>: lea 0x20(,%rax,8),%r8
>> 0x0000000000006789 <+473>: lea -0x1(%r8,%rcx,1),%rax
>> 0x000000000000678e <+478>: div %rcx
>> 0x0000000000006791 <+481>: add %rdi,%rax
>> 0x0000000000006794 <+484>: cmp %r9,%rax
>> 0x0000000000006797 <+487>: ja 0x6800 <bch_btree_node_read_done+592>
>>
>> 225 btree_blocks(b))
>> 226 goto err;
>> 227
>> 228 err = "bad magic";
>> 0x00000000000069d0 <+1056>: mov $0x0,%rdx
>> 0x00000000000069d7 <+1063>: jmpq 0x6807 <bch_btree_node_read_done+599>
>> 0x00000000000069dc <+1068>: nopl 0x0(%rax)
>>
>> 229 if (i->magic != bset_magic(&b->c->sb))
>> 0x00000000000067aa <+506>: cmp %rax,0x8(%rbx)
>> 0x00000000000067ae <+510>: jne 0x69d0
>> <bch_btree_node_read_done+1056>
>>
>> 230 goto err;
>> 231
>> 232 err = "bad checksum";
>> 0x00000000000067df <+559>: mov $0x0,%rdx
>> 0x00000000000067e6 <+566>: jmp 0x6807 <bch_btree_node_read_done+599>
>> 0x00000000000067e8 <+568>: nopl 0x0(%rax,%rax,1)
>> 0x00000000000067f0 <+576>: mov 0x1c(%rbx),%eax
>> 0x00000000000067f3 <+579>: jmpq 0x66bf <bch_btree_node_read_done+271>
>> 0x00000000000067f8 <+584>: nopl 0x0(%rax,%rax,1)
>>
>> 233 switch (i->version) {
>> 0x00000000000067b4 <+516>: cmp $0x1,%r10d
>> 0x00000000000067bb <+523>: je 0x6680 <bch_btree_node_read_done+208>
>>
>> 234 case 0:
>> 235 if (i->csum != csum_set(i))
>> 0x00000000000067c1 <+529>: lea 0x20(%rbx),%r14
>> 0x00000000000067c5 <+533>: lea 0x8(%rbx),%rdi
>> 0x00000000000067ce <+542>: sub %rdi,%rsi
>> 0x00000000000067d1 <+545>: callq 0x67d6 <bch_btree_node_read_done+550>
>> 0x00000000000067d6 <+550>: cmp %rax,%r15
>> 0x00000000000067d9 <+553>: je 0x66a6 <bch_btree_node_read_done+246>
>> 236 goto err;
>> 237 break;
>> 238 case BCACHE_BSET_VERSION:
>> 239 if (i->csum != btree_csum_set(b, i))
>> 0x000000000000669d <+237>: cmp %rax,%r15
>> 0x00000000000066a0 <+240>: jne 0x67df <bch_btree_node_read_done+559>
>> 0x00000000000067b8 <+520>: mov (%rbx),%r15
>>
>> 240 goto err;
>> 241 break;
>> 242 }
>> 243
>> 244 err = "empty set";
>> 0x00000000000069e0 <+1072>: mov $0x0,%rdx
>> 0x00000000000069e7 <+1079>: jmpq 0x6807 <bch_btree_node_read_done+599>
>>
>> 245 if (i != b->keys.set[0].data && !i->keys)
>> 0x00000000000066a6 <+246>: cmp %rbx,0x108(%r12)
>> 0x00000000000066ae <+254>: je 0x67f0 <bch_btree_node_read_done+576>
>> 0x00000000000066b4 <+260>: mov 0x1c(%rbx),%eax
>> 0x00000000000066b7 <+263>: test %eax,%eax
>> 0x00000000000066b9 <+265>: je 0x69e0
>> <bch_btree_node_read_done+1072>
>>
>> 246 goto err;
>> 247
>> 248 bch_btree_iter_push(iter, i->start,
>> bset_bkey_last(i));
>> 0x00000000000066c3 <+275>: mov %r14,%rsi
>> 0x00000000000066c6 <+278>: mov %r13,%rdi
>> 0x00000000000066c9 <+281>: callq 0x66ce <bch_btree_node_read_done+286>
>>
>> 249
>> 250 b->written += set_blocks(i, block_bytes(b->c));
>> 0x00000000000066ce <+286>: mov 0x80(%r12),%rsi
>> 0x00000000000066d6 <+294>: mov 0x1c(%rbx),%eax
>> 0x00000000000066d9 <+297>: xor %edx,%edx
>> 0x00000000000066e3 <+307>: movzwl 0x430(%rsi),%ecx
>> 0x00000000000066ea <+314>: shl $0x9,%ecx
>> 0x00000000000066ed <+317>: movslq %ecx,%rcx
>> 0x00000000000066f0 <+320>: lea 0x1f(%rcx,%rax,8),%rax
>> 0x00000000000066f5 <+325>: div %rcx
>> 0x0000000000006704 <+340>: mov %eax,%edi
>> 0x0000000000006706 <+342>: add 0xc0(%r12),%di
>> 0x0000000000006712 <+354>: mov %di,0xc0(%r12)
>>
>> 251 }
>> 252
>> 253 err = "corrupted btree";
>> 0x00000000000069b0 <+1024>: mov $0x0,%rdx
>> 0x00000000000069b7 <+1031>: jmpq 0x6807 <bch_btree_node_read_done+599>
>> 0x00000000000069bc <+1036>: nopl 0x0(%rax)
>>
>> 254 for (i = write_block(b);
>> 0x00000000000068a1 <+753>: cmp %rdx,%rcx
>> 0x00000000000068a4 <+756>: jae 0x68e5 <bch_btree_node_read_done+821>
>> 0x00000000000068e0 <+816>: cmp %rdx,%rcx
>> 0x00000000000068e3 <+819>: jb 0x68c8 <bch_btree_node_read_done+792>
>>
>> 255 bset_sector_offset(&b->keys, i) < KEY_SIZE(&b->key);
>> 256 i = ((void *) i) + block_bytes(b->c))
>> 0x00000000000068d7 <+807>: mov %rcx,%rbx
>> 0x00000000000068da <+810>: sub %r8d,%ecx
>>
>> 257 if (i->seq == b->keys.set[0].data->seq)
>> 0x00000000000068a6 <+758>: mov 0x10(%r8),%rdi
>> 0x00000000000068aa <+762>: cmp %rdi,0x10(%rbx)
>> 0x00000000000068ae <+766>: je 0x69b0
>> <bch_btree_node_read_done+1024>
>> 0x00000000000068b4 <+772>: cltq
>> 0x00000000000068b6 <+774>: mov %rax,%r9
>> 0x00000000000068b9 <+777>: lea (%rbx,%rax,1),%rcx
>> 0x00000000000068bd <+781>: neg %r9
>> 0x00000000000068c0 <+784>: jmp 0x68d7 <bch_btree_node_read_done+807>
>> 0x00000000000068c2 <+786>: nopw 0x0(%rax,%rax,1)
>> 0x00000000000068c8 <+792>: lea (%rbx,%rax,1),%rcx
>> 0x00000000000068cc <+796>: cmp 0x10(%rcx,%r9,1),%rdi
>> 0x00000000000068d1 <+801>: je 0x69b0
>> <bch_btree_node_read_done+1024>
>>
>> 258 goto err;
>> 259
>> 260 bch_btree_sort_and_fix_extents(&b->keys, iter, &b->c->sort);
>> 0x00000000000068e5 <+821>: lea 0xc8(%r12),%r14
>> 0x00000000000068ed <+829>: lea 0xcb60(%rsi),%rdx
>> 0x00000000000068f4 <+836>: mov %r13,%rsi
>> 0x00000000000068f7 <+839>: mov %r14,%rdi
>> 0x00000000000068fa <+842>: callq 0x68ff <bch_btree_node_read_done+847>
>>
>> 261
>> 262 i = b->keys.set[0].data;
>> 0x0000000000006907 <+855>: mov 0x108(%r12),%rbx
>>
>> 263 err = "short btree key";
>> 0x00000000000069ec <+1084>: mov $0x0,%rdx
>> 0x00000000000069f3 <+1091>: jmpq 0x6807 <bch_btree_node_read_done+599>
>>
>> 264 if (b->keys.set[0].size &&
>> 0x00000000000068ff <+847>: mov 0xe0(%r12),%eax
>> 0x0000000000006914 <+868>: test %eax,%eax
>> 0x0000000000006916 <+870>: je 0x694d <bch_btree_node_read_done+925>
>> 0x0000000000006944 <+916>: test %rax,%rax
>> 0x0000000000006947 <+919>: js 0x69ec
>> <bch_btree_node_read_done+1084>
>>
>> 265 bkey_cmp(&b->key, &b->keys.set[0].end) < 0)
>> 266 goto err;
>> 267
>> 268 if (b->written < btree_blocks(b))
>> 0x000000000000694d <+925>: mov 0x80(%r12),%rax
>> 0x0000000000006955 <+933>: movzwl 0xc0(%r12),%esi
>> 0x0000000000006965 <+949>: movzwl 0xde2(%rax),%ecx
>> 0x000000000000696c <+956>: shr %cl,%rdx
>> 0x000000000000696f <+959>: cmp %edx,%esi
>> 0x0000000000006971 <+961>: jae 0x6868 <bch_btree_node_read_done+696>
>>
>> 269 bch_bset_init_next(&b->keys, write_block(b),
>> 0x000000000000698f <+991>: mov %r14,%rdi
>> 0x000000000000699e <+1006>: callq 0x69a3
>> <bch_btree_node_read_done+1011>
>> 0x00000000000069a3 <+1011>: mov 0x80(%r12),%rax
>> 0x00000000000069ab <+1019>: jmpq 0x6868 <bch_btree_node_read_done+696>
>>
>> 270 bset_magic(&b->c->sb));
>> 271 out:
>> 272 mempool_free(iter, b->c->fill_iter);
>> 0x0000000000006868 <+696>: mov 0xcb58(%rax),%rsi
>> 0x000000000000686f <+703>: mov %r13,%rdi
>> 0x0000000000006872 <+706>: callq 0x6877 <bch_btree_node_read_done+711>
>>
>> 273 return;
>> 274 err:
>> 275 set_btree_node_io_error(b);
>> 276 bch_cache_set_error(b->c, "%s at bucket %zu, block %u,
>> %u keys",
>> 0x0000000000006829 <+633>: mov 0x1c(%rbx),%r9d
>> 0x000000000000684a <+666>: mov %esi,%ecx
>> 0x000000000000684c <+668>: mov $0x0,%rsi
>> 0x0000000000006853 <+675>: shr %cl,%r8d
>> 0x0000000000006856 <+678>: mov %rax,%rcx
>> 0x0000000000006859 <+681>: xor %eax,%eax
>> 0x000000000000685b <+683>: callq 0x6860 <bch_btree_node_read_done+688>
>> 0x0000000000006860 <+688>: mov 0x80(%r12),%rax
>>
>> 277 err, PTR_BUCKET_NR(b->c, &b->key, 0),
>> 278 bset_block_offset(b, i), i->keys);
>> 279 goto out;
>> 280 }
>> 0x0000000000006877 <+711>: pop %rbx
>> 0x0000000000006878 <+712>: pop %r12
>> 0x000000000000687a <+714>: pop %r13
>> 0x000000000000687c <+716>: pop %r14
>> 0x000000000000687e <+718>: pop %r15
>> 0x0000000000006880 <+720>: pop %rbp
>> 0x0000000000006881 <+721>: retq
>> 0x0000000000006882 <+722>: movzwl 0x430(%rsi),%eax
>> 0x0000000000006889 <+729>: shl $0x9,%eax
>> 0x000000000000688c <+732>: imul %eax,%ecx
>> 0x000000000000688f <+735>: movslq %ecx,%rbx
>>
>>
>> On 8/13/2014 1:45 PM, Slava Pestov wrote:
>>> Can you post the disassembly of the function?
>>>
>>> On Wed, Aug 13, 2014 at 11:35 AM, Larkin Lowrey
>>> <llowrey@xxxxxxxxxxxxxxxxx> wrote:
>>>> Thanks. Trying gdb helped me find the answer. I needed to install the
>>>> kernel-debuginfo-3.15.8-200.fc20.x86_64 package via yum.
>>>>
>>>> From addr2line:
>>>>> bch_btree_node_read_done+0x4c
>>>>> drivers/md/bcache/btree.c:207
>>>> Here'a a snippet from gdb:
>>>>
>>>>> (gdb) list *(bch_btree_node_read_done+0x4c)
>>>>> 0x65fc is in bch_btree_node_read_done (drivers/md/bcache/btree.c:207).
>>>>> 202 struct bset *i = btree_bset_first(b);
>>>>> 203 struct btree_iter *iter;
>>>>> 204
>>>>> 205 iter = mempool_alloc(b->c->fill_iter, GFP_NOWAIT);
>>>>> 206 iter->size = b->c->sb.bucket_size / b->c->sb.block_size;
>>>>> 207 iter->used = 0;
>>>>> 208
>>>>> 209 #ifdef CONFIG_BCACHE_DEBUG
>>>>> 210 iter->b = &b->keys;
>>>>> 211 #endif
>>>> This doesn't make any sense to me. If iter was null I would expect line
>>>> 206 to blow up first.
>>>>
>>>> --Larkin
>>>>
>>>> On 8/13/2014 12:41 PM, Slava Pestov wrote:
>>>>> You can try to use gdb:
>>>>>
>>>>> gdb /lib/modules/.../foo.ko
>>>>>
>>>>> list *(bch_btree_node_read_done+0x4c)
>>>>>
>>>>>
>>>>> On Wed, Aug 13, 2014 at 9:40 AM, Larkin Lowrey
>>>>> <llowrey@xxxxxxxxxxxxxxxxx> wrote:
>>>>>> This is making be feel very dumb. I've googled extensively but can't
>>>>>> figure out how to run addr2line for a module.
>>>>>>
>>>>>> I'm running Fedora 20 and the kernel did not have debugging symbols. I
>>>>>> downloaded the version with symbols but I don't know if the addresses
>>>>>> are going to be the same. Bcache is a module for me and that's where
>>>>>> things get tricky. Do you have any tips?
>>>>>>
>>>>>> --Larkin
>>>>>>
>>>>>> On 8/13/2014 12:04 AM, Kent Overstreet wrote:
>>>>>>> Any chance you could do an addr2line and get me the exact line where
>>>>>>> it happened?
>>>>>>>
>>>>>>> On Aug 12, 2014 10:02 PM, "Larkin Lowrey" <llowrey@xxxxxxxxxxxxxxxxx
>>>>>>> <mailto:llowrey@xxxxxxxxxxxxxxxxx>> wrote:
>>>>>>>
>>>>>>> I got an oops while doing some heavy I/O. I have an md raid10 cache
>>>>>>> device (4 SSDs) and 3 md raid5/6 backing devices. This setup has been
>>>>>>> well behaved for about 6 months.
>>>>>>>
>>>>>>> If this isn't a known issue is there anything I can do to provide more
>>>>>>> useful information?
>>>>>>>
>>>>>>> I'm running kernel 3.15.8-200.fc20.x86_64.
>>>>>>>
>>>>>>> [210884.047249] BUG: unable to handle kernel NULL pointer
>>>>>>> dereference at 0000000000000008
>>>>>>> [210884.055605] IP: [<ffffffffa01625fc>]
>>>>>>> bch_btree_node_read_done+0x4c/0x450 [bcache]
>>>>>>> [210884.063723] PGD 0
>>>>>>> [210884.066053] Oops: 0002 [#1] SMP
>>>>>>> [210884.069610] Modules linked in: lp parport binfmt_misc
>>>>>>> ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat xt_CHECKSUM
>>>>>>> iptable_mangle tun bridge stp llc xt_multiport ebtable_nat
>>>>>>> ebtables hwmon_vid ip6t_REJECT nf_conntrack_ipv6 nf_conntrack_ipv4
>>>>>>> nf_defrag_ipv6 nf_defrag_ipv4 ip6table_filter xt_conntrack
>>>>>>> ip6_tables nf_conntrack keyspan ezusb kvm_amd kvm crct10dif_pclmul
>>>>>>> crc32_pclmul crc32c_intel ghash_clmulni_intel microcode serio_raw
>>>>>>> amd64_edac_mod edac_core fam15h_power k10temp edac_mce_amd
>>>>>>> sp5100_tco i2c_piix4 igb ptp pps_core dca shpchp acpi_cpufreq
>>>>>>> btrfs bcache raid456 async_raid6_recov async_memcpy async_pq
>>>>>>> async_xor async_tx xor raid6_pq raid10 i2c_algo_bit drm_kms_helper
>>>>>>> ttm drm i2c_core mpt2sas mvsas libsas raid_class
>>>>>>> scsi_transport_sas cpufreq_stats
>>>>>>> [210884.140704] CPU: 5 PID: 11188 Comm: kworker/5:1 Not tainted
>>>>>>> 3.15.8-200.fc20.x86_64 #1
>>>>>>> [210884.149069] Hardware name: /H8DG6/H8DGi, BIOS 3.0a 07/2
>>>>>>> [210884.155280] Workqueue: bcache cache_lookup [bcache]
>>>>>>> [210884.160531] task: ffff880218633160 ti: ffff8800217b8000
>>>>>>> task.ti: ffff8800217b8000
>>>>>>> [210884.168502] RIP: 0010:[<ffffffffa01625fc>]
>>>>>>> [<ffffffffa01625fc>] bch_btree_node_read_done+0x4c/0x450 [bcache]
>>>>>>> [210884.179105] RSP: 0000:ffff8800217bbbe8 EFLAGS: 00010212
>>>>>>> [210884.184806] RAX: 0000000000000400 RBX: ffff880245ec0000 RCX:
>>>>>>> 0000000000000000
>>>>>>> [210884.192480] RDX: 0000000000000000 RSI: ffff880418380000 RDI:
>>>>>>> 0000000000000246
>>>>>>> [210884.200075] RBP: ffff8800217bbc10 R08: 0000000000000000 R09:
>>>>>>> 0000000000000f6b
>>>>>>> [210884.207738] R10: 0000000000000000 R11: 0000000000000400 R12:
>>>>>>> ffff880413d06c00
>>>>>>> [210884.215391] R13: 0000000000000000 R14: ffff8800217bbc20 R15:
>>>>>>> ffff880413d06c00
>>>>>>> [210884.222961] FS: 00007f73bacd6880(0000)
>>>>>>> GS:ffff88021fd40000(0000) knlGS:0000000000000000
>>>>>>> [210884.231516] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
>>>>>>> [210884.237557] CR2: 0000000000000008 CR3: 0000000001c11000 CR4:
>>>>>>> 00000000000407e0
>>>>>>> [210884.245131] Stack:
>>>>>>> [210884.247395] ffff880274f4d020 ffff880413d06c00
>>>>>>> 0000bfcc44a463f8 ffff8800217bbc20
>>>>>>> [210884.255337] ffff880413d06c00 ffff8800217bbc78
>>>>>>> ffffffffa0162b68 0000000000000000
>>>>>>> [210884.263256] ffff880218633160 0000000000000000
>>>>>>> 0000000000000000 0000000000000000
>>>>>>> [210884.271234] Call Trace:
>>>>>>> [210884.273985] [<ffffffffa0162b68>]
>>>>>>> bch_btree_node_read+0x168/0x190 [bcache]
>>>>>>> [210884.281258] [<ffffffffa0163f69>]
>>>>>>> bch_btree_node_get+0x169/0x290 [bcache]
>>>>>>> [210884.288377] [<ffffffffa01642f5>]
>>>>>>> bch_btree_map_keys_recurse+0xd5/0x1d0 [bcache]
>>>>>>> [210884.296311] [<ffffffffa016dcb0>] ?
>>>>>>> cached_dev_congested+0x180/0x180 [bcache]
>>>>>>> [210884.303953] [<ffffffff8135b204>] ?
>>>>>>> call_rwsem_down_read_failed+0x14/0x30
>>>>>>> [210884.311158] [<ffffffffa01673f7>]
>>>>>>> bch_btree_map_keys+0x127/0x150 [bcache]
>>>>>>> [210884.318273] [<ffffffffa016dcb0>] ?
>>>>>>> cached_dev_congested+0x180/0x180 [bcache]
>>>>>>> [210884.325826] [<ffffffffa016e7f5>] cache_lookup+0xf5/0x1f0 [bcache]
>>>>>>> [210884.332325] [<ffffffff810a4af6>] process_one_work+0x176/0x430
>>>>>>> [210884.338427] [<ffffffff810a578b>] worker_thread+0x11b/0x3a0
>>>>>>> [210884.344282] [<ffffffff810a5670>] ? rescuer_thread+0x3b0/0x3b0
>>>>>>> [210884.350447] [<ffffffff810ac528>] kthread+0xd8/0xf0
>>>>>>> [210884.355615] [<ffffffff810ac450>] ? insert_kthread_work+0x40/0x40
>>>>>>> [210884.362017] [<ffffffff816ff93c>] ret_from_fork+0x7c/0xb0
>>>>>>> [210884.367756] [<ffffffff810ac450>] ? insert_kthread_work+0x40/0x40
>>>>>>> [210884.374234] Code: 08 01 00 00 48 8b b8 58 cb 00 00 e8 bf 25 01
>>>>>>> e1 49 8b b4 24 80 00 00 00 49 89 c5 31 d2 0f b7 86 32 04 00 00 66
>>>>>>> f7 b6 30 04 00 00 <49> c7 45 08 00 00 00 00 0f b7 c0 49 89 45 00
>>>>>>> 48 8b 43 10 48 85
>>>>>>> [210884.395405] RIP [<ffffffffa01625fc>]
>>>>>>> bch_btree_node_read_done+0x4c/0x450 [bcache]
>>>>>>> [210884.403389] RSP <ffff8800217bbbe8>
>>>>>>> [210884.407171] CR2: 0000000000000008
>>>>>>> [210884.411233] ---[ end trace 0064e6abfd068c85 ]---
>>>>>>> [210884.416352] BUG: unable to handle kernel paging request at
>>>>>>> ffffffffffffffd8
>>>>>>> [210884.423871] IP: [<ffffffff810acb10>] kthread_data+0x10/0x20
>>>>>>> [210884.429915] PGD 1c14067 PUD 1c16067 PMD 0
>>>>>>>
>>>>>>> --Larkin
>>>>>>>
>>>>>>> --
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