Re: kern/51877: carp related panic during shutdown

[Hauke Fath <hf%spg.tu-darmstadt.de@localhost>]

The following reply was made to PR kern/51877; it has been noted by GNATS.

From: Hauke Fath <hf%spg.tu-darmstadt.de@localhost>
To: Ryota Ozaki <ozaki-r%netbsd.org@localhost>
Cc: "gnats-bugs%NetBSD.org@localhost" <gnats-bugs%netbsd.org@localhost>,
        kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost
Subject: Re: kern/51877: carp related panic during shutdown
Date: Tue, 17 Jan 2017 10:59:46 +0100

 This is a multi-part message in MIME format.
 
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 On Tue, 17 Jan 2017 13:41:01 +0900, Ryota Ozaki wrote:
 > The mutex error happened because uvm_fault_internal tries to hold
 > a rwlock with holding a spin mutex. Can you identify the spin mutex
 > by dissembling the kernel?
 
 Attached.
 
 
 --Multipart_20170117105946307115
 Content-Type: application/octet-stream; name=pr51877_objdump.lst
 Content-Transfer-Encoding: quoted-printable
 Content-Disposition: attachment; filename=pr51877_objdump.lst
 
 ffffffff8044b8b1:=09be 07 00 00 00       =09mov    $0x7,%esi
 ffffffff8044b8b6:=09bf 02 00 00 00       =09mov    $0x2,%edi
 ffffffff8044b8bb:=09e8 63 b3 fd ff       =09callq  ffffffff80426c23 <mutex_=
 obj_alloc>
 ffffffff8044b8c0:=0948 89 43 f8          =09mov    %rax,-0x8(%rbx)
 ffffffff8044b8c4:=0948 83 c3 10          =09add    $0x10,%rbx
 ffffffff8044b8c8:=0948 81 fb 88 a3 7c 80 =09cmp    $0xffffffff807ca388,%rbx
 ffffffff8044b8cf:=0975 d9                =09jne    ffffffff8044b8aa <turnst=
 ile_init+0x10>
 ffffffff8044b8d1:=0948 c7 44 24 18 00 00 =09movq   $0x0,0x18(%rsp)
 ffffffff8044b8d8:=0900 00=20
 ffffffff8044b8da:=0948 c7 44 24 10 00 00 =09movq   $0x0,0x10(%rsp)
 ffffffff8044b8e1:=0900 00=20
 ffffffff8044b8e3:=0948 c7 44 24 08 20 b8 =09movq   $0xffffffff8044b820,0x8(=
 %rsp)
 ffffffff8044b8ea:=0944 80=20
 ffffffff8044b8ec:=09c7 04 24 00 00 00 00 =09movl   $0x0,(%rsp)
 ffffffff8044b8f3:=0945 31 c9             =09xor    %r9d,%r9d
 ffffffff8044b8f6:=0949 c7 c0 13 13 6e 80 =09mov    $0xffffffff806e1313,%r8
 ffffffff8044b8fd:=0931 c9                =09xor    %ecx,%ecx
 ffffffff8044b8ff:=0931 d2                =09xor    %edx,%edx
 ffffffff8044b901:=0931 f6                =09xor    %esi,%esi
 ffffffff8044b903:=09bf 60 00 00 00       =09mov    $0x60,%edi
 ffffffff8044b908:=09e8 72 88 01 00       =09callq  ffffffff8046417f <pool_c=
 ache_init>
 ffffffff8044b90d:=0948 89 05 24 01 38 00 =09mov    %rax,0x380124(%rip)     =
    # ffffffff807cba38 <turnstile_cache>
 ffffffff8044b914:=0948 85 c0             =09test   %rax,%rax
 ffffffff8044b917:=0974 16                =09je     ffffffff8044b92f <turnst=
 ile_init+0x95>
 ffffffff8044b919:=0931 d2                =09xor    %edx,%edx
 ffffffff8044b91b:=0948 c7 c6 80 b1 89 80 =09mov    $0xffffffff8089b180,%rsi
 ffffffff8044b922:=0931 ff                =09xor    %edi,%edi
 ffffffff8044b924:=0948 83 c4 28          =09add    $0x28,%rsp
 ffffffff8044b928:=095b                   =09pop    %rbx
 ffffffff8044b929:=095d                   =09pop    %rbp
 ffffffff8044b92a:=09e9 f1 fe ff ff       =09jmpq   ffffffff8044b820 <turnst=
 ile_ctor>
 ffffffff8044b92f:=0941 b8 66 00 00 00    =09mov    $0x66,%r8d
 ffffffff8044b935:=0948 c7 c1 b0 14 6e 80 =09mov    $0xffffffff806e14b0,%rcx
 ffffffff8044b93c:=0948 c7 c2 1c 13 6e 80 =09mov    $0xffffffff806e131c,%rdx
 ffffffff8044b943:=0948 c7 c6 f7 92 68 80 =09mov    $0xffffffff806892f7,%rsi
 ffffffff8044b94a:=0948 c7 c7 b0 92 68 80 =09mov    $0xffffffff806892b0,%rdi
 ffffffff8044b951:=09e8 07 68 11 00       =09callq  ffffffff8056215d <kern_a=
 ssert>
 ffffffff8044b956:=09eb c1                =09jmp    ffffffff8044b919 <turnst=
 ile_init+0x7f>
 
 ffffffff8044b958 <turnstile_lookup>:
 ffffffff8044b958:=0955                   =09push   %rbp
 ffffffff8044b959:=0948 89 e5             =09mov    %rsp,%rbp
 ffffffff8044b95c:=0941 54                =09push   %r12
 ffffffff8044b95e:=0953                   =09push   %rbx
 ffffffff8044b95f:=0948 89 fb             =09mov    %rdi,%rbx
 ffffffff8044b962:=094c 8d 24 3f          =09lea    (%rdi,%rdi,1),%r12
 ffffffff8044b966:=0941 81 e4 f0 03 00 00 =09and    $0x3f0,%r12d
 ffffffff8044b96d:=0949 8b bc 24 80 9f 7c =09mov    -0x7f836080(%r12),%rdi
 ffffffff8044b974:=0980=20
 ffffffff8044b975:=09e8 79 a6 fd ff       =09callq  ffffffff80425ff3 <mutex_=
 enter>
 ffffffff8044b97a:=0949 8b 84 24 88 9f 7c =09mov    -0x7f836078(%r12),%rax
 ffffffff8044b981:=0980=20
 ffffffff8044b982:=0948 85 c0             =09test   %rax,%rax
 ffffffff8044b985:=0975 0a                =09jne    ffffffff8044b991 <turnst=
 ile_lookup+0x39>
 ffffffff8044b987:=09eb 13                =09jmp    ffffffff8044b99c <turnst=
 ile_lookup+0x44>
 ffffffff8044b989:=0948 8b 00             =09mov    (%rax),%rax
 ffffffff8044b98c:=0948 85 c0             =09test   %rax,%rax
 ffffffff8044b98f:=0974 06                =09je     ffffffff8044b997 <turnst=
 ile_lookup+0x3f>
 ffffffff8044b991:=0948 3b 58 18          =09cmp    0x18(%rax),%rbx
 ffffffff8044b995:=0975 f2                =09jne    ffffffff8044b989 <turnst=
 ile_lookup+0x31>
 ffffffff8044b997:=095b                   =09pop    %rbx
 ffffffff8044b998:=0941 5c                =09pop    %r12
 ffffffff8044b99a:=095d                   =09pop    %rbp
 ffffffff8044b99b:=09c3                   =09retq  =20
 ffffffff8044b99c:=0931 c0                =09xor    %eax,%eax
 ffffffff8044b99e:=0966 90                =09xchg   %ax,%ax
 ffffffff8044b9a0:=09eb f5                =09jmp    ffffffff8044b997 <turnst=
 ile_lookup+0x3f>
 
 ffffffff8044b9a2 <turnstile_exit>:
 ffffffff8044b9a2:=0955                   =09push   %rbp
 ffffffff8044b9a3:=0948 89 e5             =09mov    %rsp,%rbp
 ffffffff8044b9a6:=0948 01 ff             =09add    %rdi,%rdi
 ffffffff8044b9a9:=0981 e7 f0 03 00 00    =09and    $0x3f0,%edi
 ffffffff8044b9af:=0948 8b bf 80 9f 7c 80 =09mov    -0x7f836080(%rdi),%rdi
 ffffffff8044b9b6:=095d                   =09pop    %rbp
 ffffffff8044b9b7:=09e9 6b ad fd ff       =09jmpq   ffffffff80426727 <mutex_=
 exit>
 
 ffffffff8044b9bc <turnstile_block>:
 ffffffff8044b9bc:=0955                   =09push   %rbp
 ffffffff8044b9bd:=0948 89 e5             =09mov    %rsp,%rbp
 ffffffff8044b9c0:=0941 57                =09push   %r15
 ffffffff8044b9c2:=0941 56                =09push   %r14
 ffffffff8044b9c4:=0941 55                =09push   %r13
 ffffffff8044b9c6:=0941 54                =09push   %r12
 ffffffff8044b9c8:=0953                   =09push   %rbx
 ffffffff8044b9c9:=0948 83 ec 28          =09sub    $0x28,%rsp
 ffffffff8044b9cd:=0949 89 ff             =09mov    %rdi,%r15
 ffffffff8044b9d0:=094c 63 f6             =09movslq %esi,%r14
 ffffffff8044b9d3:=0949 89 d5             =09mov    %rdx,%r13
 ffffffff8044b9d6:=0948 89 4d c0          =09mov    %rcx,-0x40(%rbp)
 ffffffff8044b9da:=0965 48 8b 1c 25 e8 01 =09mov    %gs:0x1e8,%rbx
 ffffffff8044b9e1:=0900 00=20
 ffffffff8044b9e3:=0949 89 d4             =09mov    %rdx,%r12
 ffffffff8044b9e6:=0949 c1 ec 03          =09shr    $0x3,%r12
 ffffffff8044b9ea:=0941 83 e4 3f          =09and    $0x3f,%r12d
 ffffffff8044b9ee:=0941 83 fe 01          =09cmp    $0x1,%r14d
 ffffffff8044b9f2:=090f 87 81 06 00 00    =09ja     ffffffff8044c079 <turnst=
 ile_block+0x6bd>
 ffffffff8044b9f8:=094c 89 e0             =09mov    %r12,%rax
 ffffffff8044b9fb:=0948 c1 e0 04          =09shl    $0x4,%rax
 ffffffff8044b9ff:=0948 8b b8 80 9f 7c 80 =09mov    -0x7f836080(%rax),%rdi
 ffffffff8044ba06:=09e8 b9 ae fd ff       =09callq  ffffffff804268c4 <mutex_=
 owned>
 
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