Messages in this thread | | | Date | Thu, 14 Aug 2008 12:33:13 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: kernel BUG at lib/radix-tree.c:473! |
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Hugh Dickins wrote: > In both cases it's handling a page fault: I'm curious as to what kind > of vma this fault is occurring on. Could you devise a way of getting > us /proc/<pid>/maps output, together with the faulting address, when > it hits one of these BUGs? Or should I try to put together a patch > for that?
It's a /dev/fb0 mapping:
open("/dev/fb0", O_RDWR) = 8 ... mmap(NULL, 2097152, PROT_READ|PROT_WRITE, MAP_SHARED, 8, 0) = 0x7fed69a08000
The fault is 1 page into this mapping:
WARNING: at /home/jeremy/hg/xen/paravirt/linux/fs/buffer.c:711 __set_page_dirty+0x7e/0x113() Modules linked in: xen_fbfront fb fb_sys_fops sysimgblt sysfillrect xen_netfront syscopyarea xen_kbdfront xen_blkfront Pid: 1357, comm: X Not tainted 2.6.27-rc2-tip #337
Call Trace: [<ffffffff802346be>] warn_on_slowpath+0x5d/0x84 [<ffffffff8024a55d>] ? hrtimer_start+0x118/0x13a [<ffffffff8024a728>] ? ktime_get_ts+0x4e/0x53 [<ffffffff8022c590>] ? hrtick_start_fair+0x11b/0x152 [<ffffffff803ce686>] ? _spin_lock_irqsave+0x2a/0x33 [<ffffffff8023d87e>] ? lock_timer_base+0x2b/0x4f [<ffffffff803ce6ac>] ? _spin_unlock_irqrestore+0x1d/0x21 [<ffffffff802af7d3>] __set_page_dirty+0x7e/0x113 [<ffffffff802b19e1>] __set_page_dirty_buffers+0x84/0x89 [<ffffffff8026c876>] set_page_dirty+0x46/0xb2 [<ffffffff8026d9a1>] set_page_dirty_balance+0x17/0x4d [<ffffffff80274817>] __do_fault+0x494/0x4ae [<ffffffff803cccff>] ? thread_return+0x50/0xc3 [<ffffffff802765b3>] handle_mm_fault+0x4a1/0x967 [<ffffffff803ce640>] ? _spin_lock_irq+0x16/0x19 [<ffffffff8023f8c6>] ? ptrace_stop+0x138/0x15d [<ffffffff803ce6ac>] ? _spin_unlock_irqrestore+0x1d/0x21 [<ffffffff80224f06>] do_page_fault+0x5d0/0x9fa [<ffffffff803ce97a>] error_exit+0x0/0x70
---[ end trace a9dc8a283a23b787 ]--- ------------[ cut here ]------------ kernel BUG at /home/jeremy/hg/xen/paravirt/linux/lib/radix-tree.c:473! invalid opcode: 0000 [1] SMP CPU 0 Modules linked in: xen_fbfront fb fb_sys_fops sysimgblt sysfillrect xen_netfront syscopyarea xen_kbdfront xen_blkfront Pid: 1357, comm: X Tainted: G W 2.6.27-rc2-tip #337 RIP: e030:[<ffffffff80301cb4>] [<ffffffff80301cb4>] radix_tree_tag_set+0x17/0x9b RSP: e02b:ffff88000b049cc0 EFLAGS: 00010002 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88000e47ec08 RBP: ffff88000b049cc8 R08: 2000000000000000 R09: 0000000000000000 R10: 00007fed69a08c80 R11: ffff880001425a90 R12: ffff88000e47ec00 R13: 0000000000000001 R14: ffff88000136c150 R15: ffff88000ef4e700 FS: 00007fed6b4f9780(0000) GS:ffffffff804b6ec0(0000) knlGS:0000000000000000 CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 00007fed69a09000 CR3: 000000000cbc4000 CR4: 0000000000002620 ^^^^^^^^^^^^^^^^ DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process X (pid: 1357, threadinfo ffff88000b048000, task ffff88000cb2ecc0) Stack: ffff880001425a90 ffff88000b049cf8 ffffffff802af838 ffff88000b049ce8 ffff880001425a90 ffff88000e47ec00 ffff880001425a90 ffff88000b049d18 ffffffff802b19e1 ffff880001425a90 0000000000000001 ffff88000b049d48 Call Trace: [<ffffffff802af838>] __set_page_dirty+0xe3/0x113 [<ffffffff802b19e1>] __set_page_dirty_buffers+0x84/0x89 [<ffffffff8026c876>] set_page_dirty+0x46/0xb2 [<ffffffff8026d9a1>] set_page_dirty_balance+0x17/0x4d [<ffffffff80274817>] __do_fault+0x494/0x4ae [<ffffffff803cccff>] ? thread_return+0x50/0xc3 [<ffffffff802765b3>] handle_mm_fault+0x4a1/0x967 [<ffffffff803ce640>] ? _spin_lock_irq+0x16/0x19 [<ffffffff803ce6ac>] ? _spin_unlock_irqrestore+0x1d/0x21 [<ffffffff80224f06>] do_page_fault+0x5d0/0x9fa [<ffffffff803ce97a>] error_exit+0x0/0x70
Code: ff eb 02 31 c0 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f c9 c3 55 44 8b 0f 48 89 e5 44 89 c8 53 48 3b 34 c5 60 f0 4b 80 89 d3 76 04 <0f> 0b eb fe 41 6b c1 06 4c 8b 57 08 44 8d 58 fa 49 83 e2 fe 89 RIP [<ffffffff80301cb4>] radix_tree_tag_set+0x17/0x9b RSP <ffff88000b049cc0>
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