Attachment 315899 Details for Bug 461249 – crash output from comment #2

crash output from comment #2

bz461249-notes (text/plain), 4.20 KB, created by Bryn M. Reeves on 2008-09-05 12:28:56 UTC

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Creator: Bryn M. Reeves

Created: 2008-09-05 12:28:56 UTC

Size: 4.20 KB

patch

obsolete

>0xffffffffa00953e4 <do_get_write_access+695>:   callq  0xffffffff80138dbd <printk>
> 622                 J_ASSERT_JH(jh, jh->b_next_transaction == NULL);
>0xffffffffa00953e9 <do_get_write_access+700>:   ud2a
>0xffffffffa00953f5 <do_get_write_access+712>:   mov    0x20(%rsp),%rax                                  # load journal into %eax. %ebp has &jh
>0xffffffffa00953fa <do_get_write_access+717>:   mov    0x58(%rax),%rax                                  # load journal->j_committing_transaction into %eax
>0xffffffffa00953fe <do_get_write_access+721>:   cmp    %rax,0x20(%rbp)                                  # compare j_committing_transaction jh->b_transaction
>0xffffffffa0095402 <do_get_write_access+725>:   je     0xffffffffa0095438 <do_get_write_access+779>-----+
>0xffffffffa0095404 <do_get_write_access+727>:   mov    $0xffffffffa009c56a,%r8                          | &"jh->b_transaction == journal->j_committing_transaction"
>0xffffffffa009540b <do_get_write_access+734>:   mov    $0x270,%ecx                                      |
>0xffffffffa0095410 <do_get_write_access+739>:   mov    $0xffffffffa009c354,%rdx                         | &"fs/jbd/transaction.c"
>0xffffffffa0095417 <do_get_write_access+746>:   mov    $0xffffffffa009beb0,%rsi                         | &"do_get_write_access"
>0xffffffffa009541e <do_get_write_access+753>:   mov    $0xffffffffa009c369,%rdi                         | &"<0>Assertion failure in %s() at %s:%d: "%s"
>0xffffffffa0095425 <do_get_write_access+760>:   xor    %eax,%eax                                        |
>0xffffffffa0095427 <do_get_write_access+762>:   callq  0xffffffff80138dbd <printk>                      |
> 623                 J_ASSERT_JH(jh, jh->b_transaction ==                                               |
> 624                                         journal->j_committing_transaction);                        |
>0xffffffffa009542c <do_get_write_access+767>:   ud2a                                                    | BUG()
>0xffffffffa0095438 <do_get_write_access+779>:   mov    0xc(%rbp),%eaxi <--------------------------------+
>include/linux/jbd.h:#define BJ_Shadow   5       /* Buffer contents being shadowed to the log */
> 635                 if (jh->b_jlist == BJ_Shadow) {
>0xffffffffa009543b <do_get_write_access+782>:   cmp    $0x5,%eax
>0xffffffffa009543e <do_get_write_access+785>:   jne    0xffffffffa00954e4 <do_get_write_access+951>
>
>    
>    [exception RIP: do_get_write_access+767]
>    RIP: ffffffffa009542c  RSP: 0000010058de3d28  RFLAGS: 00010212
>    RAX: 0000000000000084  RBX: 0000000000000000  RCX: ffffffff803e95e8
>    RDX: ffffffff803e95e8  RSI: 0000000000000246  RDI: ffffffff803e95e0
>    RBP: 0000010069b9d5b0   R8: ffffffff803e95e8   R9: 0000000000000000
>    ^^^  &jh 
>    R10: 0000000100000000  R11: 000001007b981380  R12: 0000010064088500
>    R13: 0000010076d84680  R14: 000001005af47ee0  R15: 0000000000000000
>    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
>
>We apparently got here with b_transaction = 0x0x100759485c0 but
>j_committing_transaction = 0x84. Hmmm... oh no: %eax got clobbered before the
>BUG.. 
>
>jh:
>
>struct journal_head 0000010069b9d5b0
>struct journal_head {
>  b_bh = 0x10064088500, 
>  b_jcount = 1, 
>  b_jlist = 2, 
>  b_frozen_data = 0x0, 
>  b_committed_data = 0x0, 
>  b_transaction = 0x100759485c0, 
>  b_next_transaction = 0x0, 
>  b_tnext = 0x1006dc3cc90, 
>  b_tprev = 0x1006dc3c870, 
>  b_cp_transaction = 0x10075948bc0, 
>  b_cpnext = 0x1006dc3cc90, 
>  b_cpprev = 0x1006dc3c870
>}
>
>journal:
>
>This should be in 0x20(%RSP) but looking at that in crash doesn't even appear
>to be a journal_s:
>
>RSP: 0000010058de3d28
>
>struct journal_s 0x0000010058de3d48
>struct journal_s {
>  j_flags = 1100449314304, 
>  j_errno = 1678720936, 
>  j_sb_buffer = 0x0, 
>  j_superblock = 0x246, 
>  j_format_version = 1024, 
>  j_state_lock = {
>    lock = 0, 
>    magic = 5243153
>  }, 
>  j_barrier_count = 0, 
>  j_barrier = {
>    count = {
>      counter = 582
>    }, 
>    sleepers = 0, 
>    wait = {
>      lock = {
>        lock = 1678370312, 
>        magic = 256
>      }, 
>      task_list = {
>        next = 0x400, 
>        prev = 0xffffffff8017f26c
>      }
>    }
>  }, 
>  j_running_transaction = 0x280, 
>  j_committing_transaction = 0x1, 
>  j_checkpoint_transactions = 0x1005af47ee0, 
>  j_wait_transaction_locked = {
>[...]
>  }
>}

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