[포기] Lock debugging: detect incorrect freeing of live locks 옵션

안녕하세요.

malloc 과 free
그리고 각 lock 들의 안정성을 검사하기 위해서
menuconfig 에서 kernel hacking 에 있는
Lock debugging: detect incorrect freeing of live locks
옵션을 켯더니
빌드후 실행시에 modules 쪽에서 kernel panic 이 발생하네요.

-----------------------------------------------------------
[ 5.707189] Unable to handle kernel NULL pointer dereference at virtual address 00000040
[ 5.715211] pgd = c3684000
[ 5.717897] [00000040] *pgd=333e6031, *pte=00000000, *ppte=00000000
[ 5.724138] Internal error: Oops: 17 [#1]
[ 5.728121] Modules linked in: fsr(P+)
[ 5.731852] CPU: 0 Tainted: P (2.6.29.4 #6)
[ 5.737230] PC is at kmem_cache_alloc+0x48/0xac
[ 5.741728] LR is at kmem_cache_alloc+0x30/0xac
[ 5.746236] pc : [] lr : [] psr: 20000093
[ 5.746242] sp : c3677e30 ip : c3677e30 fp : c3677e5c
[ 5.757672] r10: 00000040 r9 : c3676000 r8 : bf002118
[ 5.762872] r7 : 000000d0 r6 : 40000013 r5 : 00000040 r4 : c0476418
[ 5.769371] r3 : 00000000 r2 : 0000063f r1 : 00000000 r0 : c041933d
[ 5.775872] Flags: nzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment user
[ 5.783064] Control: 10c5387d Table: 33684019 DAC: 00000015
[ 5.788782] Process insmod (pid: 1217, stack limit = 0xc36762e0)
[ 5.794762] Stack: (0xc3677e30 to 0xc3678000)
[ 5.799093] 7e20: 07d40108 00000001 00000000 0000000c
[ 5.807325] 7e40: c05234c0 00000000 00000000 ffffffff c3677ea4 c3677e60 bf002118 c00a9198
[ 5.815557] 7e60: 00000001 00000032 00042000 00000028 e78400ec 383310b4 31323835 090b0c0c
[ 5.823790] 7e80: 00000000 0000000c c05234c0 00000000 c002e0e8 00000000 c3677ec4 c3677ea8
[ 5.832022] 7ea0: bf0582b8 bf002100 c3677ec4 c3672c00 bf0508a0 bf05052c c3677edc c3677ec8
[ 5.840254] 7ec0: bf0581ac bf058218 00000000 bf05052c c3677ef4 c3677ee0 bf0580c8 bf058120
[ 5.848487] 7ee0: 00154711 bf050424 c3677f7c c3677ef8 c002d308 bf05800c 00000000 00000594
[ 5.856719] 7f00: bf058000 00000000 c015db0c c3676000 c3677f44 0000002a e980c2e8 e980bc58
[ 5.864952] 7f20: c032b4fc c048bd0c 40298008 60000013 c032b4fc c048bd0c c3677f6c c3677f48
[ 5.873184] 7f40: c032b494 00154711 bf050424 40298008 00000000 00154711 bf050424 40298008
[ 5.881416] 7f60: 00000000 c002e0e8 c3676000 00000000 c3677fa4 c3677f80 c0078ac8 c002d2b4
[ 5.889649] 7f80: 40298000 00000000 00154711 00000123 00078cd0 00000080 00000000 c3677fa8
[ 5.897881] 7fa0: c002df40 c0078a38 00154711 00000123 40298008 00154711 0007c3d0 00000002
[ 5.906114] 7fc0: 00154711 00000123 00078cd0 00000080 bec54f44 00000033 00000002 00000000
[ 5.914346] 7fe0: bec54cb8 bec54ca8 000114e0 40227ec0 60000010 40298008 3090d021 3090d421
[ 5.922578] Backtrace:
[ 5.925006] [] (kmem_cache_alloc+0x0/0xac) from [] (bml_add_disk+0x24/0x310 [fsr])
[ 5.934278] [] (bml_add_disk+0x0/0x310 [fsr]) from [] (bml_blkdev_init+0xac/0x140 [fsr])
[ 5.944070] [] (bml_blkdev_init+0x0/0x140 [fsr]) from [] (bml_block_init+0x98/0xf8 [fsr])
[ 5.953949] r5:bf05052c r4:bf0508a0
[ 5.957501] [] (bml_block_init+0x0/0xf8 [fsr]) from [] (fsr_init+0xc8/0x114 [fsr])
[ 5.966774] r5:bf05052c r4:00000000
[ 5.970326] [] (fsr_init+0x0/0x114 [fsr]) from [] (__exception_text_end+0x60/0x198)
[ 5.979686] r5:bf050424 r4:00154711
[ 5.983238] [] (__exception_text_end+0x0/0x198) from [] (sys_init_module+0x9c/0x1a4)
[ 5.992684] [] (sys_init_module+0x0/0x1a4) from [] (ret_fast_syscall+0x0/0x2c)
[ 6.001610] r7:00000080 r6:00078cd0 r5:00000123 r4:00154711
[ 6.007242] Code: e594509c e594a0ac e3550000 159430a8 (17953103)
[ 6.013335] ---[ end trace dfabeaae1f6a5b02 ]---

디버깅을 해 보았더니

kmem_cache_alloc
의 첫번째 파라미터인 struct kmem_cache *s 에 size 항목에 0xCXXXXXXX 같이 이상한 값이 들어가 있네요.
[ 5.707189] Unable to handle kernel NULL pointer dereference at virtual address 00000040
여기서 0x40 은 size 로 들어가야 할 값인데 이 값을 pointer 로 접근해서 죽은것으로 보입니다.
저 feature 에 따라서 kmem_cache struct 의 구조가 변하는것 같고 modules 에서 build 시 그 부분에 대한 kernel feature 가 안먹는 것으로 보이는데,
정작 kernel source 를 추적해 보면 kmem_cache struct 에 해당 kerenl feature 관련된 define 은 없네요.
혹시 저 feature 를 사용해 보신분 계신지요?

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