• A
    ixgbe: in shutdown, do netif_running() under rtnl_lock · 499ab5cc
    akepner 提交于
    During shutdown it's possible for __dev_close() (which holds
    rtnl_lock) to clear the __LINK_STATE_START bit, and for ixgbe
    to then read that bit (without holding rtnl_lock), and then
    not fail to free irqs, etc. The result is a crash like this:
    
    ------------[ cut here ]------------
    kernel BUG at drivers/pci/msi.c:313!
    invalid opcode: 0000 [#1] SMP
    last sysfs file: /sys/devices/system/cpu/cpu3/cache/index2/shared_cpu_map
    CPU 1
    Pid: 5910, comm: reboot Tainted: P           ----------------   2.6.32 #1 empty
    RIP: 0010:[<ffffffff81305c2b>]  [<ffffffff81305c2b>] free_msi_irqs+0x11b/0x130
    RSP: 0018:ffff880185c9bc88  EFLAGS: 00010282
    RAX: ffff880219f58bc0 RBX: ffff88021ac53b00 RCX: 0000000000000000
    RDX: 0000000000000001 RSI: 0000000000000246 RDI: 000000000000004a
    RBP: ffff880185c9bcc8 R08: 0000000000000002 R09: 0000000000000106
    R10: 0000000000000000 R11: 0000000000000006 R12: ffff88021e524778
    R13: 0000000000000001 R14: ffff88021e524000 R15: 0000000000000000
    FS:  00007f90821b7700(0000) GS:ffff880028220000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    CR2: 00007f90818bd010 CR3: 0000000132c64000 CR4: 00000000000006e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Process reboot (pid: 5910, threadinfo ffff880185c9a000, task ffff88021bf04a80)
    Stack:
     ffff880185c9bc98 000000018130529d ffff880185c9bcc8 ffff88021e524000
    <0> 0000000000000004 ffff88021948c700 0000000000000000 ffff880185c9bda7
    <0> ffff880185c9bce8 ffffffff81305cbd ffff880185c9bce8 ffff88021948c700
    Call Trace:
     [<ffffffff81305cbd>] pci_disable_msix+0x3d/0x50
     [<ffffffffa00501d5>] ixgbe_reset_interrupt_capability+0x65/0x90 [ixgbe]
     [<ffffffffa00512f6>] ixgbe_clear_interrupt_scheme+0xb6/0xd0 [ixgbe]
     [<ffffffffa005330b>] __ixgbe_shutdown+0x5b/0x200 [ixgbe]
     [<ffffffffa00534ca>] ixgbe_shutdown+0x1a/0x60 [ixgbe]
     [<ffffffff812f6c7c>] pci_device_shutdown+0x2c/0x50
     [<ffffffff813727fb>] device_shutdown+0x4b/0x160
     [<ffffffff8107d98c>] kernel_restart_prepare+0x2c/0x40
     ehci timer_action, mod_timer io_watchdog
     [<ffffffff8107d9e6>] kernel_restart+0x16/0x60
     [<ffffffff8107dbfd>] sys_reboot+0x1ad/0x200
     [<ffffffff811676cf>] ? __d_free+0x3f/0x60
     [<ffffffff81167748>] ? d_free+0x58/0x60
     [<ffffffff8116f7c0>] ? mntput_no_expire+0x30/0x100
     [<ffffffff81152b11>] ? __fput+0x191/0x200
     [<ffffffff816565fe>] ? do_page_fault+0x3e/0xa0
     [<ffffffff8100b132>] system_call_fastpath+0x16/0x1b
    Code: 4c 89 ef e8 98 8c e3 ff 4d 39 f4 48 8b 43 10 75 cf 48 83 c4 18 5b 41 5c
    41 5d 41 5e 41 5f c9 c3 49 8b 7d 20 e8 07 5a d3 ff eb c9 <0f> 0b 0f 1f 00 eb fb
    66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00
     ehci timer_action, mod_timer io_watchdog
    RIP  [<ffffffff81305c2b>] free_msi_irqs+0x11b/0x130
     RSP <ffff880185c9bc88>
    ---[ end trace 27de882a0fe75593 ]---
    
    (This was seen on a pretty old kernel/driver, but looks like
    the same bug is still possible.)
    
    Signed-off-by: <akepner@riverbed.com>
    Tested-by: NPhil Schmitt <phillip.j.schmitt@intel.com>
    Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
    499ab5cc
ixgbe_main.c 217.9 KB