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    SubjectRe: [BUG] AS io-scheduler.
    On 07/16/2007 06:31 PM, Chuck Ebbert wrote:

    >> BUG: unable to handle kernel paging request at virtual address ea86ac54
    >> printing eip:
    >> c022dfec
    >> *pde = 00000000
    >> Oops: 0000 [#1]
    >> Modules linked in: eeprom i2c_viapro vt8231 i2c_isa skge
    >> CPU: 0
    >> EIP: 0060:[<c022dfec>] Not tainted VLI
    >> EFLAGS: 00010082 (2.6.22.1 #26)
    >> EIP is at as_can_break_anticipation+0xc/0x190
    >> eax: dfcdaba0 ebx: dfcdaba0 ecx: 0035ff95 edx: cb296844
    >> esi: cb296844 edi: dfcdaba0 ebp: 00000000 esp: ceff6a70
    >> ds: 007b es: 007b fs: 0000 gs: 0033 ss: 0068
    >> Process rsync (pid: 1667, ti=ceff6000 task=d59cf5b0 task.ti=ceff6000)
    >> Stack: cb296844 00000001 cb296844 dfcdaba0 00000000 c022efc8 cb296844
    >> 00000000
    >> dfcffb9c c0227a76 dfcffb9c 00000000 c016e96e cb296844 00000000
    >> dfcffb9c
    >> 00000000 c022af64 00000000 dfcffb9c 00000008 00000000 08ff6b30
    >> c04d1ec0
    >> Call Trace:
    >> [<c022efc8>] as_add_request+0xa8/0xc0
    >> [<c0227a76>] elv_insert+0xa6/0x150
    >> [<c016e96e>] bio_phys_segments+0xe/0x20
    >> [<c022af64>] __make_request+0x384/0x490
    >> [<c02add1e>] ide_do_request+0x6ee/0x890
    >> [<c02294ab>] generic_make_request+0x18b/0x1c0
    >> [<c022b596>] submit_bio+0xa6/0xb0
    >> [<c013b7b8>] mempool_alloc+0x28/0xa0
    >> [<c016bb66>] __find_get_block+0xf6/0x130
    >> [<c016e0bc>] bio_alloc_bioset+0x8c/0xf0
    >> [<c016b647>] submit_bh+0xb7/0xe0
    >> [<c016c1f8>] ll_rw_block+0x78/0x90
    >> [<c019c85d>] search_by_key+0xdd/0xd20
    >> [<c016c201>] ll_rw_block+0x81/0x90
    >> [<c011f190>] irq_exit+0x40/0x60
    >> [<c01066e4>] do_IRQ+0x94/0xb0
    >> [<c0104bc3>] common_interrupt+0x23/0x30
    >> [<c018beca>] reiserfs_read_locked_inode+0x6a/0x490
    >> [<c018e580>] reiserfs_find_actor+0x0/0x20
    >> [<c018c33b>] reiserfs_iget+0x4b/0x80
    >> [<c018e570>] reiserfs_init_locked_inode+0x0/0x10
    >> [<c0189824>] reiserfs_lookup+0xa4/0xf0
    >> [<c0157b03>] do_lookup+0xa3/0x140
    >> [<c0159265>] __link_path_walk+0x615/0xa20
    >> [<c0168a18>] __mark_inode_dirty+0x28/0x150
    >> [<c01631c1>] mntput_no_expire+0x11/0x50
    >> [<c01596b2>] link_path_walk+0x42/0xb0
    >> [<c0159960>] do_path_lookup+0x130/0x150
    >> [<c015a190>] __user_walk_fd+0x30/0x50
    >> [<c0154766>] vfs_lstat_fd+0x16/0x40
    >> [<c01547df>] sys_lstat64+0xf/0x30
    >> [<c0103c42>] syscall_call+0x7/0xb
    >> =======================
    >
    > static int as_can_break_anticipation(struct as_data *ad, struct request *rq)
    > {
    > struct io_context *ioc;
    > struct as_io_context *aic;
    >
    > ioc = ad->io_context; <======== ad is bogus
    > BUG_ON(!ioc);
    >
    >
    > Call chain is:
    >
    > as_add_request
    > as_update_rq:
    > if (ad->antic_status == ANTIC_WAIT_REQ
    > || ad->antic_status == ANTIC_WAIT_NEXT) {
    > if (as_can_break_anticipation(ad, rq))
    > as_antic_stop(ad);
    > }
    >
    >
    > So somehow 'ad' became invalid between the time ad->antic_status was
    > checked and as_can_break_anticipation() tried to access ad->io_context?

    Is this similar to:

    http://lkml.org/lkml/2007/6/4/50

    ?

    Rene.
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