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    SubjectRe: [PATCH UPDATE] deflate stack usage in lib/inflate.c
    On Thu, Apr 12, 2007 at 01:50:54PM -0700, Jeremy Fitzhardinge wrote:
    > Subject: deflate stack usage in lib/inflate.c
    > inflate_fixed and huft_build together use around 2.7k of stack. When
    > using 4k stacks, I saw stack overflows from interrupts arriving while
    > unpacking the root initrd:
    > do_IRQ: stack overflow: 384
    > [<c0106b64>] show_trace_log_lvl+0x1a/0x30
    > [<c01075e6>] show_trace+0x12/0x14
    > [<c010763f>] dump_stack+0x16/0x18
    > [<c0107ca4>] do_IRQ+0x6d/0xd9
    > [<c010202b>] xen_evtchn_do_upcall+0x6e/0xa2
    > [<c0106781>] xen_hypervisor_callback+0x25/0x2c
    > [<c010116c>] xen_restore_fl+0x27/0x29
    > [<c0330f63>] _spin_unlock_irqrestore+0x4a/0x50
    > [<c0117aab>] change_page_attr+0x577/0x584
    > [<c0117b45>] kernel_map_pages+0x8d/0xb4
    > [<c016a314>] cache_alloc_refill+0x53f/0x632
    > [<c016a6c2>] __kmalloc+0xc1/0x10d
    > [<c0463d34>] malloc+0x10/0x12
    > [<c04641c1>] huft_build+0x2a7/0x5fa
    > [<c04645a5>] inflate_fixed+0x91/0x136
    > [<c04657e2>] unpack_to_rootfs+0x5f2/0x8c1
    > [<c0465acf>] populate_rootfs+0x1e/0xe4
    > (This was under Xen, but there's no reason it couldn't happen on bare
    > hardware.)
    > This patch mallocs the local variables, thereby reducing the stack
    > usage to sane levels.
    > Also, up the heap size for the kernel decompressor to deal with the
    > extra allocation.

    Lost the non-x86 bits again.

    Mathematics is the supreme nostalgia of our time.
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      Last update: 2007-04-14 00:29    [W:0.020 / U:3.468 seconds]
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