RE: Boot failure caused by "mm/cma.c: free the reserved memblock when free cma pages"
Hi Very strange, I test it on ARM arch, It works well. I think revert it is ok , I have a discussion with Russell, His concern make sense, Remove this patch is ok. https://lkml.org/lkml/2014/9/18/171 the crash is interesting, I will have a look. Sorry for that .. -Original Message- From: Sasha Levin [mailto:sasha.le...@oracle.com] Sent: Wednesday, September 24, 2014 7:03 AM To: Wang, Yalin; Minchan Kim Cc: Michal Hocko; Hugh Dickins; Joonsoo Kim; Andrew Morton; LKML; linux...@kvack.org Subject: Boot failure caused by "mm/cma.c: free the reserved memblock when free cma pages" Hi Yalin, I'm seeing the following BUG when booting the latest -next kernel. I've bisected it down to "mm/cma.c: free the reserved memblock when free cma pages". [2.438701] BUG: unable to handle kernel paging request at 880972493000 [2.438701] IP: memblock_isolate_range (mm/memblock.c:624) [2.438701] PGD 34b51067 PUD 34b54067 PMD 976c56067 PTE 800972493060 [2.438701] Oops: [#1] PREEMPT SMP DEBUG_PAGEALLOC [2.438701] Dumping ftrace buffer: [2.438701](ftrace buffer empty) [2.438701] Modules linked in: [2.438701] CPU: 17 PID: 1 Comm: swapper/0 Not tainted 3.17.0-rc6-next-20140923-sasha-00037-gc40eca4 #1213 [2.438701] task: 88076d7d ti: 880048d4 task.ti: 880048d4 [2.438701] RIP: memblock_isolate_range (mm/memblock.c:624) [2.438701] RSP: :880048d43cf8 EFLAGS: 00010286 [2.438828] RAX: 880972493000 RBX: 00096260 RCX: 880048d43d50 [2.439590] RDX: 0020 RSI: 00096240 RDI: b2fcaa30 [2.44] RBP: 880048d43d38 R08: 880048d43d54 R09: 0001 [2.44] R10: R11: 0001 R12: 880048d43d54 [2.44] R13: 00096240 R14: R15: b2fcaa30 [2.44] FS: () GS:880567c0() knlGS: [2.44] CS: 0010 DS: ES: CR0: 8005003b [2.44] CR2: 880972493000 CR3: 31e2f000 CR4: 06a0 [2.44] Stack: [2.44] ad29cda2 880048d43d50 ea002eeb4000 00096240 [2.44] b2fcaa30 a000 ea002eeb4008 [2.44] 880048d43d68 b049e64a 00096240 [2.44] Call Trace: [2.44] ? adjust_managed_page_count (mm/page_alloc.c:5430) [2.44] memblock_remove_range (mm/memblock.c:672) [2.44] memblock_free (mm/memblock.c:695) [2.44] init_cma_reserved_pageblock (mm/page_alloc.c:840) [2.44] cma_init_reserved_areas (mm/cma.c:118 mm/cma.c:133) [2.44] ? kfree (mm/slub.c:2674 mm/slub.c:3339) [2.44] ? early_memunmap (mm/cma.c:129) [2.44] do_one_initcall (init/main.c:792) [2.44] kernel_init_freeable (init/main.c:857 init/main.c:865 init/main.c:884 init/main.c:1005) [2.44] ? rest_init (init/main.c:932) [2.44] kernel_init (init/main.c:937) [2.44] ret_from_fork (arch/x86/kernel/entry_64.S:348) [2.44] ? rest_init (init/main.c:932) [ 2.44] Code: 89 ff e8 ec fa ff ff 85 c0 79 e1 b8 f4 ff ff ff e9 c0 00 00 00 4c 01 eb 45 31 f6 49 63 c6 49 3b 07 73 b9 48 c1 e0 05 49 03 47 18 <48> 8b 10 48 8b 48 08 48 8d 34 11 48 39 d3 76 a1 49 39 f5 0f 83 All code 0: 89 ff mov%edi,%edi 2: e8 ec fa ff ff callq 0xfaf3 7: 85 c0 test %eax,%eax 9: 79 e1 jns0xffec b: b8 f4 ff ff ff mov$0xfff4,%eax 10: e9 c0 00 00 00 jmpq 0xd5 15: 4c 01 ebadd%r13,%rbx 18: 45 31 f6xor%r14d,%r14d 1b: 49 63 c6movslq %r14d,%rax 1e: 49 3b 07cmp(%r15),%rax 21: 73 b9 jae0xffdc 23: 48 c1 e0 05 shl$0x5,%rax 27: 49 03 47 18 add0x18(%r15),%rax 2b:* 48 8b 10mov(%rax),%rdx <-- trapping instruction 2e: 48 8b 48 08 mov0x8(%rax),%rcx 32: 48 8d 34 11 lea(%rcx,%rdx,1),%rsi 36: 48 39 d3cmp%rdx,%rbx 39: 76 a1 jbe0xffdc 3b: 49 39 f5cmp%rsi,%r13 3e: 0f .byte 0xf 3f: 83 .byte 0x83 ... Code starting with the faulting instruction === 0: 48 8b 10mov(%rax),%rdx 3: 48 8b 48 08 mov0x8(%rax),%rcx 7: 48 8d 34 11 lea(%rcx,%rdx,1),%rsi b: 48 39 d3cmp%rdx,%rbx e: 76 a1 jbe0xffb1 10: 49 39 f5cmp%rsi,%r13 13: 0f .byte 0xf 14:
RE: Boot failure caused by mm/cma.c: free the reserved memblock when free cma pages
Hi Very strange, I test it on ARM arch, It works well. I think revert it is ok , I have a discussion with Russell, His concern make sense, Remove this patch is ok. https://lkml.org/lkml/2014/9/18/171 the crash is interesting, I will have a look. Sorry for that .. -Original Message- From: Sasha Levin [mailto:sasha.le...@oracle.com] Sent: Wednesday, September 24, 2014 7:03 AM To: Wang, Yalin; Minchan Kim Cc: Michal Hocko; Hugh Dickins; Joonsoo Kim; Andrew Morton; LKML; linux...@kvack.org Subject: Boot failure caused by mm/cma.c: free the reserved memblock when free cma pages Hi Yalin, I'm seeing the following BUG when booting the latest -next kernel. I've bisected it down to mm/cma.c: free the reserved memblock when free cma pages. [2.438701] BUG: unable to handle kernel paging request at 880972493000 [2.438701] IP: memblock_isolate_range (mm/memblock.c:624) [2.438701] PGD 34b51067 PUD 34b54067 PMD 976c56067 PTE 800972493060 [2.438701] Oops: [#1] PREEMPT SMP DEBUG_PAGEALLOC [2.438701] Dumping ftrace buffer: [2.438701](ftrace buffer empty) [2.438701] Modules linked in: [2.438701] CPU: 17 PID: 1 Comm: swapper/0 Not tainted 3.17.0-rc6-next-20140923-sasha-00037-gc40eca4 #1213 [2.438701] task: 88076d7d ti: 880048d4 task.ti: 880048d4 [2.438701] RIP: memblock_isolate_range (mm/memblock.c:624) [2.438701] RSP: :880048d43cf8 EFLAGS: 00010286 [2.438828] RAX: 880972493000 RBX: 00096260 RCX: 880048d43d50 [2.439590] RDX: 0020 RSI: 00096240 RDI: b2fcaa30 [2.44] RBP: 880048d43d38 R08: 880048d43d54 R09: 0001 [2.44] R10: R11: 0001 R12: 880048d43d54 [2.44] R13: 00096240 R14: R15: b2fcaa30 [2.44] FS: () GS:880567c0() knlGS: [2.44] CS: 0010 DS: ES: CR0: 8005003b [2.44] CR2: 880972493000 CR3: 31e2f000 CR4: 06a0 [2.44] Stack: [2.44] ad29cda2 880048d43d50 ea002eeb4000 00096240 [2.44] b2fcaa30 a000 ea002eeb4008 [2.44] 880048d43d68 b049e64a 00096240 [2.44] Call Trace: [2.44] ? adjust_managed_page_count (mm/page_alloc.c:5430) [2.44] memblock_remove_range (mm/memblock.c:672) [2.44] memblock_free (mm/memblock.c:695) [2.44] init_cma_reserved_pageblock (mm/page_alloc.c:840) [2.44] cma_init_reserved_areas (mm/cma.c:118 mm/cma.c:133) [2.44] ? kfree (mm/slub.c:2674 mm/slub.c:3339) [2.44] ? early_memunmap (mm/cma.c:129) [2.44] do_one_initcall (init/main.c:792) [2.44] kernel_init_freeable (init/main.c:857 init/main.c:865 init/main.c:884 init/main.c:1005) [2.44] ? rest_init (init/main.c:932) [2.44] kernel_init (init/main.c:937) [2.44] ret_from_fork (arch/x86/kernel/entry_64.S:348) [2.44] ? rest_init (init/main.c:932) [ 2.44] Code: 89 ff e8 ec fa ff ff 85 c0 79 e1 b8 f4 ff ff ff e9 c0 00 00 00 4c 01 eb 45 31 f6 49 63 c6 49 3b 07 73 b9 48 c1 e0 05 49 03 47 18 48 8b 10 48 8b 48 08 48 8d 34 11 48 39 d3 76 a1 49 39 f5 0f 83 All code 0: 89 ff mov%edi,%edi 2: e8 ec fa ff ff callq 0xfaf3 7: 85 c0 test %eax,%eax 9: 79 e1 jns0xffec b: b8 f4 ff ff ff mov$0xfff4,%eax 10: e9 c0 00 00 00 jmpq 0xd5 15: 4c 01 ebadd%r13,%rbx 18: 45 31 f6xor%r14d,%r14d 1b: 49 63 c6movslq %r14d,%rax 1e: 49 3b 07cmp(%r15),%rax 21: 73 b9 jae0xffdc 23: 48 c1 e0 05 shl$0x5,%rax 27: 49 03 47 18 add0x18(%r15),%rax 2b:* 48 8b 10mov(%rax),%rdx -- trapping instruction 2e: 48 8b 48 08 mov0x8(%rax),%rcx 32: 48 8d 34 11 lea(%rcx,%rdx,1),%rsi 36: 48 39 d3cmp%rdx,%rbx 39: 76 a1 jbe0xffdc 3b: 49 39 f5cmp%rsi,%r13 3e: 0f .byte 0xf 3f: 83 .byte 0x83 ... Code starting with the faulting instruction === 0: 48 8b 10mov(%rax),%rdx 3: 48 8b 48 08 mov0x8(%rax),%rcx 7: 48 8d 34 11 lea(%rcx,%rdx,1),%rsi b: 48 39 d3cmp%rdx,%rbx e: 76 a1 jbe0xffb1 10: 49 39 f5cmp%rsi,%r13 13: 0f .byte 0xf 14: 83
