good day, every one:
since we using realtek NIC rtl8111g instead FEC, system will hang for iperf testing about 32 hours, and I got a kernel panic in attach file.
the LR register's value is "8043cf88", kernel panic message is "Unable to handle kernel paging request at virtual address 00100104".
from the kernel dump:
static inline int bit_spin_trylock(int bitnum, unsigned long *addr)
{
preempt_disable();
8043cf70: e5993004 ldr r3, [r9, #4]
8043cf74: e2833001 add r3, r3, #1
8043cf78: e5893004 str r3, [r9, #4]
#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
if (unlikely(test_and_set_bit_lock(bitnum, addr))) {
8043cf7c: e3a00000 mov r0, #0
8043cf80: e1a01004 mov r1, r4
8043cf84: ebf6a891 bl 801e71d0 <_test_and_set_bit>
8043cf88: e3500000 cmp r0, #0
8043cf8c: 0a000007 beq 8043cfb0 <__slab_alloc.isra.53.constprop.57+0x1a8>
preempt_enable();
......
according kernel panic message, I find out the entire kernel hang in the following steps:
rtl8168_rx_interrupt() -> rtl8168_try_rx_copy() -> dev_alloc_skb() -> alloc_skb() -> kmalloc_track_caller() -> slab_alloc() -> slab_lock() ->lock_and_freeze_slab() -> bit_spin_lock() -> test_and_set_bit_lock() -> test_and_set_bit() <-- failed
the reason seems test_and_set_bit() operate the invalid memory address, and break the kernel.
I wonder some one inside the slab allocator functions gives the invalid memory address.
does anybody else using SDK_4.1.0's kernel and have a solution about this problem?
Original Attachment has been moved to: kernel_panic.zip
