Messages in this thread Patch in this message | | | Date | Mon, 28 Jan 2008 18:44:36 -0800 | From | Yinghai Lu <> | Subject | [PATCH] x86_64: fix overlap between pagetable with bss section |
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[PATCH] x86_64: fix overlap between pagetable with bss section
one early crash on one 8 node 256g machine
Command line: console=uart8250,io,0x3f8,115200n8 initrd=kernel.org/mydisk11_x86_64.gz rw root=/dev/ram0 debug initcall_debug apic=debug acpi.debug_level=0x0000000f pci=routeirq ip=dhcp load_ramdisk=1 ramdisk_size=131072 BOOT_IMAGE=kernel.org/bzImage_2.6.25_k8.1 BIOS-provided physical RAM map: BIOS-e820: 0000000000000000 - 000000000009bc00 (usable) BIOS-e820: 000000000009bc00 - 00000000000a0000 (reserved) BIOS-e820: 00000000000e6000 - 0000000000100000 (reserved) BIOS-e820: 0000000000100000 - 00000000dffe0000 (usable) BIOS-e820: 00000000dffe0000 - 00000000dffee000 (ACPI data) BIOS-e820: 00000000dffee000 - 00000000dffff050 (ACPI NVS) BIOS-e820: 00000000dffff050 - 00000000e0000000 (reserved) BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved) BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved) BIOS-e820: 00000000ff700000 - 0000000100000000 (reserved) BIOS-e820: 0000000100000000 - 0000004020000000 (usable) Early serial console at I/O port 0x3f8 (options '115200n8') console [uart0] enabled end_pfn_map = 67239936 Kernel panic - not syncing: Duplicated early reservation d40000-e42000
Pid: 0, comm: swapper Not tainted 2.6.24-smp-g5a514e21-dirty #3
Call Trace: [<ffffffff80221545>] lapic_get_maxlvt+0x0/0x10 [<ffffffff80221657>] clear_local_APIC+0x5/0xcf [<ffffffff80221726>] disable_local_APIC+0x5/0x17 [<ffffffff8021fe16>] smp_send_stop+0x46/0x4c [<ffffffff80235293>] panic+0x94/0x13e [<ffffffff80bc3b03>] sctp_eps_proc_init+0x12/0x34 [<ffffffff80b9f1c5>] reserve_early+0x30/0x6c [<ffffffff80803925>] init_memory_mapping+0x2cd/0x2dc [<ffffffff80b9dc01>] setup_arch+0x21f/0x44e [<ffffffff80b978be>] start_kernel+0x6f/0x2c7 [<ffffffff80b971cc>] _sinittext+0x1cc/0x1d3
one later oops on other machine
Calling initcall 0xffffffff80bc33ac: sctp_init+0x0/0x711() BUG: unable to handle kernel NULL pointer dereference at 000000000000005f IP: [<ffffffff802bfe55>] proc_register+0xe7/0x10f PGD 0 Oops: 0000 [1] SMP CPU 7 Modules linked in: Pid: 1, comm: swapper Not tainted 2.6.24-smp-g5a514e21-dirty #1 RIP: 0010:[<ffffffff802bfe55>] [<ffffffff802bfe55>] proc_register+0xe7/0x10f RSP: 0000:ffff811074c55e60 EFLAGS: 00010246 RAX: 0000000000008d8d RBX: ffff811074d78d80 RCX: ffff811074c55e08 RDX: 0000000000000000 RSI: 0000000000000141 RDI: ffffffff80cc2460 RBP: ffffffffffffffff R08: 0000000000000000 R09: ffff811074d78d80 R10: 0000000000000000 R11: ffffffff80b78750 R12: ffff811074c55e6c R13: 0000000000000000 R14: ffff811074c55ee0 R15: 00000006eb27426e FS: 0000000000000000(0000) GS:ffff811074cc7f00(0000) knlGS:0000000000000000 CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b CR2: 000000000000005f CR3: 0000000000201000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process swapper (pid: 1, threadinfo ffff811074c54000, task ffff810874c54000) Stack: ffffffff80a57340 0000014100000000 ffff811074d78d80 0000000000000000 00000000ffffff97 ffffffff802bfef0 0000000000000000 ffffffffffffffff 0000000000000000 ffffffff80bc3b41 ffff811074c55ee0 ffffffff80bc349b Call Trace: [<ffffffff802bfef0>] ? create_proc_entry+0x73/0x8a [<ffffffff80bc3b41>] ? sctp_snmp_proc_init+0x1c/0x34 [<ffffffff80bc349b>] ? sctp_init+0xef/0x711 [<ffffffff80b976e3>] ? kernel_init+0x175/0x2e1 [<ffffffff8020ccf8>] ? child_rip+0xa/0x12 [<ffffffff80b9756e>] ? kernel_init+0x0/0x2e1 [<ffffffff8020ccee>] ? child_rip+0x0/0x12
Code: 1e 48 83 7b 38 00 75 08 48 c7 43 38 f0 e8 82 80 48 83 7b 30 00 75 08 48 c7 43 30 d0 e9 82 80 48 c7 c7 60 24 cc 80 e8 bd 5a 54 00 <48> 8b 45 60 48 89 6b 58 48 89 5d 60 48 89 43 50 fe 05 f5 25 a0 RIP [<ffffffff802bfe55>] proc_register+0xe7/0x10f RSP <ffff811074c55e60> CR2: 000000000000005f ---[ end trace c97bfb5810c69e0c ]--- Kernel panic - not syncing: Attempted to kill init!
it turns out there is overlap between pgtable and bss...
need to round up table_start to PAGE
also make the panic more informative.
Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
diff --git a/arch/x86/kernel/e820_64.c b/arch/x86/kernel/e820_64.c index f8b7beb..6f07bab 100644 --- a/arch/x86/kernel/e820_64.c +++ b/arch/x86/kernel/e820_64.c @@ -70,8 +70,8 @@ void __init reserve_early(unsigned long start, unsigned long end) for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) { r = &early_res[i]; if (end > r->start && start < r->end) - panic("Duplicated early reservation %lx-%lx\n", - start, end); + panic("Overlap early reservation %lx-%lx to %lx-%lx\n", + start, end, r->start, r->end); } if (i >= MAX_EARLY_RES) panic("Too many early reservations"); diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index b09faf2..bf02f7e 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -358,6 +358,8 @@ static void __init find_early_table_space(unsigned long end) if (table_start == -1UL) panic("Cannot find space for the kernel page tables"); + /* need to round it up to avoid overlap less one page */ + table_start = round_up(table_start, PAGE_SIZE); table_start >>= PAGE_SHIFT; table_end = table_start;
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