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    SubjectRe: [PATCH] add check do_direct_IO() return val
    > Well, I'm having a heck of a time getting this to fail.  It looks  
    > possible, though. Joe, were you guys able to narrow it down to a
    > reproducible test case? Do you have any oops output messages from
    > the crashes?

    Zach, it easy to reproduce through fio with following config file

    # cat jobfile
    [global]
    bs=8k
    iodepth=1024
    iodepth_batch=60
    randrepeat=1
    size=1m
    directory=/home/oracle
    numjobs=20
    [job1]
    ioengine=sync
    bs=1k
    direct=1
    rw=randread
    filename=file1:file2
    [job2]
    ioengine=libaio
    rw=randwrite
    direct=1
    filename=file1:file2
    [job3]
    bs=1k
    ioengine=posixaio
    rw=randwrite
    direct=1
    filename=file1:file2
    [job4]
    ioengine=splice
    direct=1
    rw=randwrite
    filename=file1:file2
    [job5]
    bs=1k
    ioengine=sync
    rw=randread
    filename=file1:file2
    [job7]
    ioengine=libaio
    rw=randwrite
    filename=file1:file2
    [job8]
    ioengine=posixaio
    rw=randwrite
    filename=file1:file2
    [job9]
    ioengine=splice
    rw=randwrite
    filename=file1:file2
    [job10]
    ioengine=mmap
    rw=randwrite
    bs=1k
    filename=file1:file2
    [job11]
    ioengine=mmap
    rw=randwrite
    direct=1
    filename=file1:file2



    Runing fio just a short time, will get panic like following:


    BUG: unable to handle kernel paging request at virtual address 23c070bf
    printing eip:
    c04a07fd
    *pdpt = 000000001ff88001
    *pde = 0000000000000000
    Oops: 0000 [#1]
    SMP
    Modules linked in: netconsole autofs4 hidp nfs lockd nfs_acl rfcomm l2cap
    bluetooth sunrpc ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr
    @ iscsi_tcp libiscsi scsi_transport_iscsi dm_mirror dm_multipath dm_mod video
    sbs button battery ac ipv6 parport_pc lp parport i2c_piix4 i2c_core cfi_probe
    gen_probe floppy scb2_flash sg mtdcore chipreg tg3 e1000 serio_raw ide_cd
    @ cdrom aic7xxx scsi_transport_spi sd_mod scsi_mod ext3 jbd ehci_hcd ohci_hcd
    uhci_hcd
    CPU: 0
    EIP: 0060:[<c04a07fd>] Not tainted VLI
    EFLAGS: 00010293 (2.6.22 #2)
    EIP is at bio_get_nr_vecs+0x0/0x30
    eax: 23c07063 ebx: 00000003 ecx: ffffffff edx: 00000000
    esi: de5cef74 edi: f54a9600 ebp: 00000000 esp: de5ceca8
    ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068
    Process fio (pid: 17820, ti=de5ce000 task=de6570e0 task.ti=de5ce000)
    Stack: c04a1c9d ffffffff ffffffff 00000009 f54a9600 de5cef74 00000000 f54a9600
    c04a1f43 00000000 c04a2b46 c0460466 c2c5baa0 c0812500 c0462c0a 00000001
    00000001 df4b90d4 de5ceee4 00000011 00000001 00000009 00000009 00000000
    Call Trace:
    [<c04a1c9d>] dio_new_bio+0x82/0xfe
    [<c04a1f43>] dio_send_cur_page+0x4a/0x92
    [<c04a2b46>] __blockdev_direct_IO+0xa09/0xc83
    [<c0460466>] __pagevec_free+0x14/0x1a
    [<c0462c0a>] release_pages+0x137/0x13f
    [<f8856f30>] journal_start+0xaf/0xdd [jbd]
    [<f8890fec>] ext3_direct_IO+0xfd/0x190 [ext3]
    [<f888f6af>] ext3_get_block+0x0/0xd0 [ext3]
    [<c045d803>] generic_file_direct_IO+0xe5/0x116
    [<c045d890>] generic_file_direct_write+0x5c/0x137
    [<c045e285>] __generic_file_aio_write_nolock+0x37b/0x4df
    [<c045e43e>] generic_file_aio_write+0x55/0xb3
    [<f888cfdc>] ext3_file_write+0x24/0x8f [ext3]
    [<c0481af9>] do_sync_write+0xc7/0x10a
    [<c04347d2>] check_kill_permission+0xec/0xf5
    [<c043c557>] autoremove_wake_function+0x0/0x35
    [<c0481a32>] do_sync_write+0x0/0x10a
    [<c048233e>] vfs_write+0xa8/0x154
    [<c0482a1a>] sys_pwrite64+0x48/0x5f
    [<c0404e12>] syscall_call+0x7/0xb
    [<c0620000>] xfrm_replay_timer_handler+0x3e/0x44
    =======================
    Code: 89 c5 c7 44 24 14 f4 ff ff ff 74 d2 e9 b3 fe ff ff 83 7c 24 34 00 0f 84
    0b ff ff ff e9 51 ff ff ff 83 c4 20 89 e8 5b 5e 5f 5d c3 <8b> 40 5c 8b 48 38
    8b 81 20 01 00 00 0f b7 91 2a 01 00 00 0f b7
    EIP: [<c04a07fd>] bio_get_nr_vecs+0x0/0x30 SS:ESP 0068:de5ceca8




    I have tried to trace the code, panic reason is dio->map_bh.b_bdev not init by
    direct_io_worker(). at do_direct_IO, dio_get_page() will return EFAULT at
    this issue, it caused the dio->map_bh cannot init by later code and direct
    return a error. but at direct_io_worker() do not handle for the error.

    Thanks,
    Joe



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