Re: NFS/lazy-umount/path-lookup-related panics at shutdown (at kill of processes on lazy-umounted filesystems) with 3.9.2 and 3.9.5

From: Nix
Date: Tue Jun 11 2013 - 07:11:19 EST

On 11 Jun 2013, Al Viro spake thusly:

> On Mon, Jun 10, 2013 at 06:42:49PM +0100, Nix wrote:
>> Yes, my shutdown scripts are panicking the kernel again! They're not
>> causing filesystem corruption this time, but it's still fs-related.
>>
>> Here's the 3.9.5 panic, seen on an x86-32 NFS client using NFSv3: NFSv4
>> was compiled in but not used. This happened when processes whose
>> current directory was on one of those NFS-mounted filesystems were being
>> killed, after it had been lazy-umounted (so by this point its cwd was in
>> a disconnected mount point).
>
> Hrm... Could you post (or drop on anonftp, etc.) disassembly of path_init() from
> your kernel? The code quoted in oops looks very odd...

Sure! The compiler is GCC 4.7.3 20130310 (so not on a release branch: it
is possible this is an already-fixed compiler bug).

Both x86-32 and x86-64 disassemblies follow:

x86:

0000083f <path_init>:
83f: 55 push %ebp
840: 57 push %edi
841: 56 push %esi
842: 53 push %ebx
843: 83 ec 0c sub $0xc,%esp
846: 89 d5 mov %edx,%ebp
848: 89 ca mov %ecx,%edx
84a: 89 cf mov %ecx,%edi
84c: 8b 5c 24 20 mov 0x20(%esp),%ebx
850: 80 ce 10 or $0x10,%dh
853: f6 c5 20 test $0x20,%ch
856: c7 43 28 01 00 00 00 movl $0x1,0x28(%ebx)
85d: 89 53 20 mov %edx,0x20(%ebx)
860: c7 43 2c 00 00 00 00 movl $0x0,0x2c(%ebx)
867: 74 6c je 8d5 <path_init+0x96>
869: 8b 43 18 mov 0x18(%ebx),%eax
86c: 80 7d 00 00 cmpb $0x0,0x0(%ebp)
870: 8b 70 20 mov 0x20(%eax),%esi
873: 74 21 je 896 <path_init+0x57>
875: f6 46 02 02 testb $0x2,0x2(%esi)
879: 0f 85 12 02 00 00 jne a91 <path_init+0x252>
87f: 8b 46 18 mov 0x18(%esi),%eax
882: 83 38 00 cmpl $0x0,(%eax)
885: 75 05 jne 88c <path_init+0x4d>
887: e9 9a 01 00 00 jmp a26 <path_init+0x1e7>
88c: 66 83 4e 02 02 orw $0x2,0x2(%esi)
891: e9 fb 01 00 00 jmp a91 <path_init+0x252>
896: 8b 43 14 mov 0x14(%ebx),%eax
899: 8b 53 18 mov 0x18(%ebx),%edx
89c: 89 03 mov %eax,(%ebx)
89e: 89 53 04 mov %edx,0x4(%ebx)
8a1: 89 73 1c mov %esi,0x1c(%ebx)
8a4: 83 e7 40 and $0x40,%edi
8a7: 74 20 je 8c9 <path_init+0x8a>
8a9: b8 00 00 00 00 mov $0x0,%eax
8ae: e8 fc ff ff ff call 8af <path_init+0x70>
8b3: 8b 53 04 mov 0x4(%ebx),%edx
8b6: 8b 42 04 mov 0x4(%edx),%eax
8b9: a8 01 test $0x1,%al
8bb: 74 04 je 8c1 <path_init+0x82>
8bd: f3 90 pause
8bf: eb f5 jmp 8b6 <path_init+0x77>
8c1: 89 43 24 mov %eax,0x24(%ebx)
8c4: e9 bd 01 00 00 jmp a86 <path_init+0x247>
8c9: 89 d8 mov %ebx,%eax
8cb: e8 fc ff ff ff call 8cc <path_init+0x8d>
8d0: e9 b1 01 00 00 jmp a86 <path_init+0x247>
8d5: c7 43 14 00 00 00 00 movl $0x0,0x14(%ebx)
8dc: 80 7d 00 2f cmpb $0x2f,0x0(%ebp)
8e0: 0f 85 8b 00 00 00 jne 971 <path_init+0x132>
8e6: 83 e7 40 and $0x40,%edi
8e9: 74 4e je 939 <path_init+0xfa>
8eb: b8 00 00 00 00 mov $0x0,%eax
8f0: e8 fc ff ff ff call 8f1 <path_init+0xb2>
8f5: 83 7b 14 00 cmpl $0x0,0x14(%ebx)
8f9: 75 66 jne 961 <path_init+0x122>
8fb: a1 00 00 00 00 mov 0x0,%eax
900: 8b 88 54 02 00 00 mov 0x254(%eax),%ecx
906: 8b 71 04 mov 0x4(%ecx),%esi
909: f7 c6 01 00 00 00 test $0x1,%esi
90f: 74 04 je 915 <path_init+0xd6>
911: f3 90 pause
913: eb f1 jmp 906 <path_init+0xc7>
915: 8b 51 14 mov 0x14(%ecx),%edx
918: 8b 41 10 mov 0x10(%ecx),%eax
91b: 89 53 18 mov %edx,0x18(%ebx)
91e: 89 43 14 mov %eax,0x14(%ebx)
921: 8b 53 18 mov 0x18(%ebx),%edx
924: 8b 42 04 mov 0x4(%edx),%eax
927: a8 01 test $0x1,%al
929: 74 04 je 92f <path_init+0xf0>
92b: f3 90 pause
92d: eb f5 jmp 924 <path_init+0xe5>
92f: 89 43 24 mov %eax,0x24(%ebx)
932: 39 71 04 cmp %esi,0x4(%ecx)
935: 74 2a je 961 <path_init+0x122>
937: eb cd jmp 906 <path_init+0xc7>
939: a1 00 00 00 00 mov 0x0,%eax
93e: 8d 6b 14 lea 0x14(%ebx),%ebp
941: 8b 80 54 02 00 00 mov 0x254(%eax),%eax
947: 8b 70 10 mov 0x10(%eax),%esi
94a: 8b 78 14 mov 0x14(%eax),%edi
94d: 89 7b 18 mov %edi,0x18(%ebx)
950: 89 73 14 mov %esi,0x14(%ebx)
953: 89 e8 mov %ebp,%eax
955: e8 fc ff ff ff call 956 <path_init+0x117>
95a: 89 e8 mov %ebp,%eax
95c: e8 fc ff ff ff call 95d <path_init+0x11e>
961: 8b 43 14 mov 0x14(%ebx),%eax
964: 8b 53 18 mov 0x18(%ebx),%edx
967: 89 03 mov %eax,(%ebx)
969: 89 53 04 mov %edx,0x4(%ebx)
96c: e9 0c 01 00 00 jmp a7d <path_init+0x23e>
971: 83 f8 9c cmp $0xffffff9c,%eax
974: 75 6a jne 9e0 <path_init+0x1a1>
976: a1 00 00 00 00 mov 0x0,%eax
97b: 83 e7 40 and $0x40,%edi
97e: 74 43 je 9c3 <path_init+0x184>
980: 8b b0 54 02 00 00 mov 0x254(%eax),%esi
986: b8 00 00 00 00 mov $0x0,%eax
98b: e8 fc ff ff ff call 98c <path_init+0x14d>
990: 8b 4e 04 mov 0x4(%esi),%ecx
993: f6 c1 01 test $0x1,%cl
996: 74 04 je 99c <path_init+0x15d>
998: f3 90 pause
99a: eb f4 jmp 990 <path_init+0x151>
99c: 8b 56 1c mov 0x1c(%esi),%edx
99f: 8b 46 18 mov 0x18(%esi),%eax
9a2: 89 53 04 mov %edx,0x4(%ebx)
9a5: 89 03 mov %eax,(%ebx)
9a7: 8b 53 04 mov 0x4(%ebx),%edx
9aa: 8b 42 04 mov 0x4(%edx),%eax
9ad: a8 01 test $0x1,%al
9af: 74 04 je 9b5 <path_init+0x176>
9b1: f3 90 pause
9b3: eb f5 jmp 9aa <path_init+0x16b>
9b5: 89 43 24 mov %eax,0x24(%ebx)
9b8: 39 4e 04 cmp %ecx,0x4(%esi)
9bb: 0f 84 bc 00 00 00 je a7d <path_init+0x23e>
9c1: eb cd jmp 990 <path_init+0x151>
9c3: 8b 80 54 02 00 00 mov 0x254(%eax),%eax
9c9: 8b 50 1c mov 0x1c(%eax),%edx
9cc: 8b 40 18 mov 0x18(%eax),%eax
9cf: 89 03 mov %eax,(%ebx)
9d1: 89 53 04 mov %edx,0x4(%ebx)
9d4: 89 d8 mov %ebx,%eax
9d6: e8 fc ff ff ff call 9d7 <path_init+0x198>
9db: e9 87 00 00 00 jmp a67 <path_init+0x228>
9e0: 8d 54 24 08 lea 0x8(%esp),%edx
9e4: e8 fc ff ff ff call 9e5 <path_init+0x1a6>
9e9: 8b 54 24 08 mov 0x8(%esp),%edx
9ed: 89 c6 mov %eax,%esi
9ef: 89 14 24 mov %edx,(%esp)
9f2: 85 c0 test %eax,%eax
9f4: 0f 84 90 00 00 00 je a8a <path_init+0x24b>
9fa: 8b 40 0c mov 0xc(%eax),%eax
9fd: 80 7d 00 00 cmpb $0x0,0x0(%ebp)
a01: 74 2d je a30 <path_init+0x1f1>
a03: 8b 40 20 mov 0x20(%eax),%eax
a06: f6 40 02 02 testb $0x2,0x2(%eax)
a0a: 75 24 jne a30 <path_init+0x1f1>
a0c: 8b 48 18 mov 0x18(%eax),%ecx
a0f: 83 39 00 cmpl $0x0,(%ecx)
a12: 0f 84 8f 00 00 00 je aa7 <path_init+0x268>
a18: 66 83 48 02 02 orw $0x2,0x2(%eax)
a1d: eb 11 jmp a30 <path_init+0x1f1>
a1f: 89 f0 mov %esi,%eax
a21: e8 fc ff ff ff call a22 <path_init+0x1e3>
a26: b8 ec ff ff ff mov $0xffffffec,%eax
a2b: e9 86 00 00 00 jmp ab6 <path_init+0x277>
a30: 8b 46 08 mov 0x8(%esi),%eax
a33: 8b 56 0c mov 0xc(%esi),%edx
a36: 89 53 04 mov %edx,0x4(%ebx)
a39: 89 03 mov %eax,(%ebx)
a3b: 83 e7 40 and $0x40,%edi
a3e: 74 29 je a69 <path_init+0x22a>
a40: 83 3c 24 00 cmpl $0x0,(%esp)
a44: 74 06 je a4c <path_init+0x20d>
a46: 8b 44 24 24 mov 0x24(%esp),%eax
a4a: 89 30 mov %esi,(%eax)
a4c: 8b 53 04 mov 0x4(%ebx),%edx
a4f: 8b 42 04 mov 0x4(%edx),%eax
a52: a8 01 test $0x1,%al
a54: 74 04 je a5a <path_init+0x21b>
a56: f3 90 pause
a58: eb f5 jmp a4f <path_init+0x210>
a5a: 89 43 24 mov %eax,0x24(%ebx)
a5d: b8 00 00 00 00 mov $0x0,%eax
a62: e8 fc ff ff ff call a63 <path_init+0x224>
a67: eb 14 jmp a7d <path_init+0x23e>
a69: 89 d8 mov %ebx,%eax
a6b: e8 fc ff ff ff call a6c <path_init+0x22d>
a70: 83 3c 24 00 cmpl $0x0,(%esp)
a74: 74 07 je a7d <path_init+0x23e>
a76: 89 f0 mov %esi,%eax
a78: e8 fc ff ff ff call a79 <path_init+0x23a>
a7d: 8b 43 04 mov 0x4(%ebx),%eax
a80: 8b 40 20 mov 0x20(%eax),%eax
a83: 89 43 1c mov %eax,0x1c(%ebx)
a86: 31 c0 xor %eax,%eax
a88: eb 2c jmp ab6 <path_init+0x277>
a8a: b8 f7 ff ff ff mov $0xfffffff7,%eax
a8f: eb 25 jmp ab6 <path_init+0x277>
a91: ba 01 00 00 00 mov $0x1,%edx
a96: 89 f0 mov %esi,%eax
a98: e8 fc ff ff ff call a99 <path_init+0x25a>
a9d: 85 c0 test %eax,%eax
a9f: 0f 84 f1 fd ff ff je 896 <path_init+0x57>
aa5: eb 0f jmp ab6 <path_init+0x277>
aa7: 83 3c 24 00 cmpl $0x0,(%esp)
aab: 0f 84 75 ff ff ff je a26 <path_init+0x1e7>
ab1: e9 69 ff ff ff jmp a1f <path_init+0x1e0>
ab6: 83 c4 0c add $0xc,%esp
ab9: 5b pop %ebx
aba: 5e pop %esi
abb: 5f pop %edi
abc: 5d pop %ebp
abd: c3 ret

x86-64:

0000000000002406 <path_init>:
2406: e8 00 00 00 00 callq 240b <get_write_access+0x240b>
240b: 55 push %rbp
240c: 89 d0 mov %edx,%eax
240e: 48 89 e5 mov %rsp,%rbp
2411: 41 57 push %r15
2413: 80 cc 10 or $0x10,%ah
2416: 41 56 push %r14
2418: 49 89 f6 mov %rsi,%r14
241b: 41 55 push %r13
241d: 41 89 d5 mov %edx,%r13d
2420: 41 54 push %r12
2422: 53 push %rbx
2423: 48 89 cb mov %rcx,%rbx
2426: 48 83 ec 28 sub $0x28,%rsp
242a: f6 c6 20 test $0x20,%dh
242d: c7 41 40 01 00 00 00 movl $0x1,0x40(%rcx)
2434: 89 41 38 mov %eax,0x38(%rcx)
2437: c7 41 44 00 00 00 00 movl $0x0,0x44(%rcx)
243e: 0f 84 9b 00 00 00 je 24df <get_write_access+0x24df>
2444: 48 8b 41 28 mov 0x28(%rcx),%rax
2448: 80 3e 00 cmpb $0x0,(%rsi)
244b: 4c 8b 60 30 mov 0x30(%rax),%r12
244f: 74 40 je 2491 <get_write_access+0x2491>
2451: 41 f6 44 24 02 02 testb $0x2,0x2(%r12)
2457: 0f 85 e4 02 00 00 jne 2741 <get_write_access+0x2741>
245d: 49 8b 44 24 20 mov 0x20(%r12),%rax
2462: 48 83 38 00 cmpq $0x0,(%rax)
2466: 75 05 jne 246d <get_write_access+0x246d>
2468: e9 5a 02 00 00 jmpq 26c7 <get_write_access+0x26c7>
246d: 4d 8d b4 24 88 00 00 lea 0x88(%r12),%r14
2474: 00
2475: 4c 89 f7 mov %r14,%rdi
2478: e8 00 00 00 00 callq 247d <get_write_access+0x247d>
247d: 4c 89 f7 mov %r14,%rdi
2480: 66 41 83 4c 24 02 02 orw $0x2,0x2(%r12)
2487: e8 00 00 00 00 callq 248c <get_write_access+0x248c>
248c: e9 b0 02 00 00 jmpq 2741 <get_write_access+0x2741>
2491: 48 8b 43 20 mov 0x20(%rbx),%rax
2495: 41 80 e5 40 and $0x40,%r13b
2499: 4c 89 63 30 mov %r12,0x30(%rbx)
249d: 48 89 03 mov %rax,(%rbx)
24a0: 48 8b 43 28 mov 0x28(%rbx),%rax
24a4: 48 89 43 08 mov %rax,0x8(%rbx)
24a8: 74 28 je 24d2 <get_write_access+0x24d2>
24aa: 48 c7 c7 00 00 00 00 mov $0x0,%rdi
24b1: e8 00 00 00 00 callq 24b6 <get_write_access+0x24b6>
24b6: e8 00 00 00 00 callq 24bb <get_write_access+0x24bb>
24bb: 48 8b 53 08 mov 0x8(%rbx),%rdx
24bf: 8b 42 04 mov 0x4(%rdx),%eax
24c2: a8 01 test $0x1,%al
24c4: 74 04 je 24ca <get_write_access+0x24ca>
24c6: f3 90 pause
24c8: eb f5 jmp 24bf <get_write_access+0x24bf>
24ca: 89 43 3c mov %eax,0x3c(%rbx)
24cd: e9 64 02 00 00 jmpq 2736 <get_write_access+0x2736>
24d2: 48 89 df mov %rbx,%rdi
24d5: e8 00 00 00 00 callq 24da <get_write_access+0x24da>
24da: e9 57 02 00 00 jmpq 2736 <get_write_access+0x2736>
24df: 48 c7 41 20 00 00 00 movq $0x0,0x20(%rcx)
24e6: 00
24e7: 80 3e 2f cmpb $0x2f,(%rsi)
24ea: 0f 85 c3 00 00 00 jne 25b3 <get_write_access+0x25b3>
24f0: 41 80 e5 40 and $0x40,%r13b
24f4: 74 5e je 2554 <get_write_access+0x2554>
24f6: 48 c7 c7 00 00 00 00 mov $0x0,%rdi
24fd: e8 00 00 00 00 callq 2502 <get_write_access+0x2502>
2502: e8 00 00 00 00 callq 2507 <get_write_access+0x2507>
2507: 48 83 7b 20 00 cmpq $0x0,0x20(%rbx)
250c: 0f 85 8d 00 00 00 jne 259f <get_write_access+0x259f>
2512: 65 48 8b 04 25 00 00 mov %gs:0x0,%rax
2519: 00 00
251b: 48 8b 80 58 05 00 00 mov 0x558(%rax),%rax
2522: 8b 50 08 mov 0x8(%rax),%edx
2525: f6 c2 01 test $0x1,%dl
2528: 74 04 je 252e <get_write_access+0x252e>
252a: f3 90 pause
252c: eb f4 jmp 2522 <get_write_access+0x2522>
252e: 48 8b 48 18 mov 0x18(%rax),%rcx
2532: 48 89 4b 20 mov %rcx,0x20(%rbx)
2536: 48 8b 70 20 mov 0x20(%rax),%rsi
253a: 48 89 73 28 mov %rsi,0x28(%rbx)
253e: 8b 4e 04 mov 0x4(%rsi),%ecx
2541: f6 c1 01 test $0x1,%cl
2544: 74 04 je 254a <get_write_access+0x254a>
2546: f3 90 pause
2548: eb f4 jmp 253e <get_write_access+0x253e>
254a: 89 4b 3c mov %ecx,0x3c(%rbx)
254d: 39 50 08 cmp %edx,0x8(%rax)
2550: 74 4d je 259f <get_write_access+0x259f>
2552: eb ce jmp 2522 <get_write_access+0x2522>
2554: 65 48 8b 04 25 00 00 mov %gs:0x0,%rax
255b: 00 00
255d: 4c 8b a0 58 05 00 00 mov 0x558(%rax),%r12
2564: 4c 8d 69 20 lea 0x20(%rcx),%r13
2568: 4d 8d 74 24 04 lea 0x4(%r12),%r14
256d: 4c 89 f7 mov %r14,%rdi
2570: e8 00 00 00 00 callq 2575 <get_write_access+0x2575>
2575: 49 8b 44 24 18 mov 0x18(%r12),%rax
257a: 4c 89 ef mov %r13,%rdi
257d: 48 89 43 20 mov %rax,0x20(%rbx)
2581: 49 8b 44 24 20 mov 0x20(%r12),%rax
2586: 48 89 43 28 mov %rax,0x28(%rbx)
258a: e8 00 00 00 00 callq 258f <get_write_access+0x258f>
258f: 4c 89 f7 mov %r14,%rdi
2592: e8 00 00 00 00 callq 2597 <get_write_access+0x2597>
2597: 4c 89 ef mov %r13,%rdi
259a: e8 00 00 00 00 callq 259f <get_write_access+0x259f>
259f: 48 8b 43 20 mov 0x20(%rbx),%rax
25a3: 48 89 03 mov %rax,(%rbx)
25a6: 48 8b 43 28 mov 0x28(%rbx),%rax
25aa: 48 89 43 08 mov %rax,0x8(%rbx)
25ae: e9 77 01 00 00 jmpq 272a <get_write_access+0x272a>
25b3: 83 ff 9c cmp $0xffffff9c,%edi
25b6: 0f 85 94 00 00 00 jne 2650 <get_write_access+0x2650>
25bc: 65 48 8b 04 25 00 00 mov %gs:0x0,%rax
25c3: 00 00
25c5: 41 80 e5 40 and $0x40,%r13b
25c9: 4c 8b a0 58 05 00 00 mov 0x558(%rax),%r12
25d0: 74 4b je 261d <get_write_access+0x261d>
25d2: 48 c7 c7 00 00 00 00 mov $0x0,%rdi
25d9: e8 00 00 00 00 callq 25de <get_write_access+0x25de>
25de: e8 00 00 00 00 callq 25e3 <get_write_access+0x25e3>
25e3: 41 8b 44 24 08 mov 0x8(%r12),%eax
25e8: a8 01 test $0x1,%al
25ea: 74 04 je 25f0 <get_write_access+0x25f0>
25ec: f3 90 pause
25ee: eb f3 jmp 25e3 <get_write_access+0x25e3>
25f0: 49 8b 54 24 28 mov 0x28(%r12),%rdx
25f5: 48 89 13 mov %rdx,(%rbx)
25f8: 49 8b 4c 24 30 mov 0x30(%r12),%rcx
25fd: 48 89 4b 08 mov %rcx,0x8(%rbx)
2601: 8b 51 04 mov 0x4(%rcx),%edx
2604: f6 c2 01 test $0x1,%dl
2607: 74 04 je 260d <get_write_access+0x260d>
2609: f3 90 pause
260b: eb f4 jmp 2601 <get_write_access+0x2601>
260d: 89 53 3c mov %edx,0x3c(%rbx)
2610: 41 39 44 24 08 cmp %eax,0x8(%r12)
2615: 0f 84 0f 01 00 00 je 272a <get_write_access+0x272a>
261b: eb c6 jmp 25e3 <get_write_access+0x25e3>
261d: 4d 8d 6c 24 04 lea 0x4(%r12),%r13
2622: 4c 89 ef mov %r13,%rdi
2625: e8 00 00 00 00 callq 262a <get_write_access+0x262a>
262a: 49 8b 44 24 28 mov 0x28(%r12),%rax
262f: 48 89 df mov %rbx,%rdi
2632: 48 89 03 mov %rax,(%rbx)
2635: 49 8b 44 24 30 mov 0x30(%r12),%rax
263a: 48 89 43 08 mov %rax,0x8(%rbx)
263e: e8 00 00 00 00 callq 2643 <get_write_access+0x2643>
2643: 4c 89 ef mov %r13,%rdi
2646: e8 00 00 00 00 callq 264b <get_write_access+0x264b>
264b: e9 da 00 00 00 jmpq 272a <get_write_access+0x272a>
2650: 48 8d 75 cc lea -0x34(%rbp),%rsi
2654: 4c 89 45 b8 mov %r8,-0x48(%rbp)
2658: e8 00 00 00 00 callq 265d <get_write_access+0x265d>
265d: 44 8b 7d cc mov -0x34(%rbp),%r15d
2661: 48 85 c0 test %rax,%rax
2664: 49 89 c4 mov %rax,%r12
2667: 4c 8b 45 b8 mov -0x48(%rbp),%r8
266b: 0f 84 c9 00 00 00 je 273a <get_write_access+0x273a>
2671: 41 80 3e 00 cmpb $0x0,(%r14)
2675: 48 8b 50 18 mov 0x18(%rax),%rdx
2679: 74 56 je 26d1 <get_write_access+0x26d1>
267b: 4c 8b 72 30 mov 0x30(%rdx),%r14
267f: 41 f6 46 02 02 testb $0x2,0x2(%r14)
2684: 75 4b jne 26d1 <get_write_access+0x26d1>
2686: 49 8b 56 20 mov 0x20(%r14),%rdx
268a: 48 83 3a 00 cmpq $0x0,(%rdx)
268e: 0f 84 c4 00 00 00 je 2758 <get_write_access+0x2758>
2694: 49 8d 96 88 00 00 00 lea 0x88(%r14),%rdx
269b: 48 89 d7 mov %rdx,%rdi
269e: 48 89 55 b0 mov %rdx,-0x50(%rbp)
26a2: e8 00 00 00 00 callq 26a7 <get_write_access+0x26a7>
26a7: 66 41 83 4e 02 02 orw $0x2,0x2(%r14)
26ad: 48 8b 55 b0 mov -0x50(%rbp),%rdx
26b1: 48 89 d7 mov %rdx,%rdi
26b4: e8 00 00 00 00 callq 26b9 <get_write_access+0x26b9>
26b9: 4c 8b 45 b8 mov -0x48(%rbp),%r8
26bd: eb 12 jmp 26d1 <get_write_access+0x26d1>
26bf: 4c 89 e7 mov %r12,%rdi
26c2: e8 00 00 00 00 callq 26c7 <get_write_access+0x26c7>
26c7: b8 ec ff ff ff mov $0xffffffec,%eax
26cc: e9 95 00 00 00 jmpq 2766 <get_write_access+0x2766>
26d1: 49 8b 54 24 10 mov 0x10(%r12),%rdx
26d6: 41 80 e5 40 and $0x40,%r13b
26da: 48 89 13 mov %rdx,(%rbx)
26dd: 49 8b 54 24 18 mov 0x18(%r12),%rdx
26e2: 48 89 53 08 mov %rdx,0x8(%rbx)
26e6: 74 2d je 2715 <get_write_access+0x2715>
26e8: 45 85 ff test %r15d,%r15d
26eb: 74 03 je 26f0 <get_write_access+0x26f0>
26ed: 4d 89 20 mov %r12,(%r8)
26f0: 48 8b 53 08 mov 0x8(%rbx),%rdx
26f4: 8b 42 04 mov 0x4(%rdx),%eax
26f7: a8 01 test $0x1,%al
26f9: 74 04 je 26ff <get_write_access+0x26ff>
26fb: f3 90 pause
26fd: eb f5 jmp 26f4 <get_write_access+0x26f4>
26ff: 89 43 3c mov %eax,0x3c(%rbx)
2702: 48 c7 c7 00 00 00 00 mov $0x0,%rdi
2709: e8 00 00 00 00 callq 270e <get_write_access+0x270e>
270e: e8 00 00 00 00 callq 2713 <get_write_access+0x2713>
2713: eb 15 jmp 272a <get_write_access+0x272a>
2715: 48 89 df mov %rbx,%rdi
2718: e8 00 00 00 00 callq 271d <get_write_access+0x271d>
271d: 45 85 ff test %r15d,%r15d
2720: 74 08 je 272a <get_write_access+0x272a>
2722: 4c 89 e7 mov %r12,%rdi
2725: e8 00 00 00 00 callq 272a <get_write_access+0x272a>
272a: 48 8b 43 08 mov 0x8(%rbx),%rax
272e: 48 8b 40 30 mov 0x30(%rax),%rax
2732: 48 89 43 30 mov %rax,0x30(%rbx)
2736: 31 c0 xor %eax,%eax
2738: eb 2c jmp 2766 <get_write_access+0x2766>
273a: b8 f7 ff ff ff mov $0xfffffff7,%eax
273f: eb 25 jmp 2766 <get_write_access+0x2766>
2741: be 01 00 00 00 mov $0x1,%esi
2746: 4c 89 e7 mov %r12,%rdi
2749: e8 00 00 00 00 callq 274e <get_write_access+0x274e>
274e: 85 c0 test %eax,%eax
2750: 0f 84 3b fd ff ff je 2491 <get_write_access+0x2491>
2756: eb 0e jmp 2766 <get_write_access+0x2766>
2758: 45 85 ff test %r15d,%r15d
275b: 0f 84 66 ff ff ff je 26c7 <get_write_access+0x26c7>
2761: e9 59 ff ff ff jmpq 26bf <get_write_access+0x26bf>
2766: 48 83 c4 28 add $0x28,%rsp
276a: 5b pop %rbx
276b: 41 5c pop %r12
276d: 41 5d pop %r13
276f: 41 5e pop %r14
2771: 41 5f pop %r15
2773: 5d pop %rbp
2774: c3 retq
--
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