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Subject2.6.24-rc1-54866f032307063776b4eff7eadb131d47f9f9b4 fails to boot: kernel BUG at include/linux/scatterlist.h:49!
Both 2.6.24-rc1 and the current git version fail to boot for me:

[ 57.182205] ohci1394: fw-host0: OHCI-1394 1.1 (PCI): IRQ=[16]
MMIO=[effff800-efffffff] Max Packet=
[2048] IR/IT contexts=[4/8]
[ 57.194032] eth1394: eth2: IPv4 over IEEE 1394 (fw-host0)
[ 57.199527] ------------[ cut here ]------------
[ 57.204154] kernel BUG at include/linux/scatterlist.h:49!
[ 57.209559] invalid opcode: 0000 [1] SMP
[ 57.213667] CPU 0
[ 57.215742] Modules linked in:
[ 57.218857] Pid: 1, comm: swapper Not tainted 2.6.24-rc1 #1
[ 57.224435] RIP: 0010:[<ffffffff80463512>] [<ffffffff80463512>]
dma_region_alloc+0x142/0x180
[ 57.233003] RSP: 0000:ffff810004f29db0 EFLAGS: 00010293
[ 57.238322] RAX: ffffc20001454000 RBX: 0000000000000000 RCX: ffffe20001c7e690
[ 57.245457] RDX: 0000000000000000 RSI: 00003ffffffff000 RDI: 0000000000000388
[ 57.252592] RBP: ffff810005ddca48 R08: 0000000000000000 R09: ffffc20001454000
[ 57.259727] R10: 0000000000000002 R11: 0000000000000000 R12: 0000000087654321
[ 57.266862] R13: ffff810100914000 R14: 0000000000000002 R15: ffff810005e88000
[ 57.273996] FS: 0000000000000000(0000) GS:ffffffff8079c000(0000)
knlGS:0000000000000000
[ 57.282082] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
[ 57.287834] CR2: 0000000000e01766 CR3: 0000000000201000 CR4: 00000000000006e0
[ 57.294968] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 57.302102] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 57.309238] Process swapper (pid: 1, threadinfo ffff810004f28000,
task ffff81010032a000)
[ 57.317332] Stack: ffff810005ddca48 0000000000000002
ffff810005ddca00 0000000000000010
[ 57.325546] 000000000000001f ffffffff80464146 ffffffff8089ff00
0000000000010000
[ 57.333104] ffff810005ddca00 ffff8101011b66c0 ffff810005e88000
ffffffff80754740
[ 57.340455] Call Trace:
[ 57.343139] [<ffffffff80464146>] hpsb_iso_common_init+0x1e6/0x210
[ 57.349322] [<ffffffff80464198>] hpsb_iso_recv_init+0x28/0x70
[ 57.355159] [<ffffffff8046c940>] ether1394_iso+0x0/0x130
[ 57.360564] [<ffffffff8046bc08>] ether1394_recv_init+0x58/0xd0
[ 57.366488] [<ffffffff8046c940>] ether1394_iso+0x0/0x130
[ 57.371893] [<ffffffff8045e8b7>] highlevel_for_each_host_reg+0x17/0x60
[ 57.378508] [<ffffffff8045e8a0>] highlevel_for_each_host_reg+0x0/0x60
[ 57.385039] [<ffffffff80460f74>] nodemgr_for_each_host+0x44/0x90
[ 57.391136] [<ffffffff807dfac6>] ether1394_init_module+0x36/0x70
[ 57.397232] [<ffffffff807be724>] kernel_init+0x164/0x350
[ 57.402637] [<ffffffff8020c9c8>] child_rip+0xa/0x12
[ 57.407609] [<ffffffff807be5c0>] kernel_init+0x0/0x350
[ 57.412842] [<ffffffff8020c9be>] child_rip+0x0/0x12
[ 57.417814]
[ 57.419327]
[ 57.419327] Code: 0f 0b eb fe 0f 0b eb fe 66 0f 1f 44 00 00 48 c7 c7 38 40 6e
[ 57.428891] RIP [<ffffffff80463512>] dma_region_alloc+0x142/0x180
[ 57.435117] RSP <ffff810004f29db0>
[ 57.438629] Kernel panic - not syncing: Attempted to kill init!
from gdb:
0xffffffff80463512 is in dma_region_alloc (include/linux/scatterlist.h:49).
44 * In order for the low bit stealing approach to work, pages
45 * must be aligned at a 32-bit boundary as a minimum.
46 */
47 BUG_ON((unsigned long) page & 0x03);
48 #ifdef CONFIG_DEBUG_SG
49 BUG_ON(sg->sg_magic != SG_MAGIC);
50 #endif
51 sg->page_link = page_link | (unsigned long) page;
52 }
53
Torsten
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