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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on: commit: 855ac3c67d74dadc57431fafcf59497d22879bc0 ("memblock changes") https://github.com/riteshharjani/linux kfence-fix-patchv3 in testcase: boot config: x86_64-rhel-8.3 compiler: gcc-12 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G (please refer to attached dmesg/kmsg for entire log/backtrace) +---------------------------------------------+------------+------------+ | | cc6765ead4 | 855ac3c67d | +---------------------------------------------+------------+------------+ | BUG:kernel_NULL_pointer_dereference,address | 0 | 18 | | Oops | 0 | 18 | | RIP:memmap_init | 0 | 18 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 18 | +---------------------------------------------+------------+------------+ If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202410202212.b63f1e37-oliver.sang@intel.com [ 0.045566][ T0] BUG: kernel NULL pointer dereference, address: 00000000000000a0 [ 0.046381][ T0] #PF: supervisor read access in kernel mode [ 0.047019][ T0] #PF: error_code(0x0000) - not-present page [ 0.047675][ T0] PGD 0 P4D 0 [ 0.048035][ T0] Oops: Oops: 0000 [#1] SMP PTI [ 0.048560][ T0] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 6.12.0-rc2-00018-g855ac3c67d74 #1 [ 0.049578][ T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 0.050714][ T0] RIP: 0010:memmap_init (mm/mm_init.c:952) [ 0.051288][ T0] Code: 63 d2 6a 01 6a 00 e8 62 8a b7 fd 5a 59 4c 39 e5 0f 82 c8 00 00 00 4c 89 f5 41 83 c7 01 48 81 c3 00 06 00 00 41 83 ff 05 74 49 <48> 83 bb a0 00 00 00 00 74 e5 48 8b 93 88 00 00 00 4c 8b 83 98 00 All code ======== 0: 63 d2 movslq %edx,%edx 2: 6a 01 pushq $0x1 4: 6a 00 pushq $0x0 6: e8 62 8a b7 fd callq 0xfffffffffdb78a6d b: 5a pop %rdx c: 59 pop %rcx d: 4c 39 e5 cmp %r12,%rbp 10: 0f 82 c8 00 00 00 jb 0xde 16: 4c 89 f5 mov %r14,%rbp 19: 41 83 c7 01 add $0x1,%r15d 1d: 48 81 c3 00 06 00 00 add $0x600,%rbx 24: 41 83 ff 05 cmp $0x5,%r15d 28: 74 49 je 0x73 2a:* 48 83 bb a0 00 00 00 cmpq $0x0,0xa0(%rbx) <-- trapping instruction 31: 00 32: 74 e5 je 0x19 34: 48 8b 93 88 00 00 00 mov 0x88(%rbx),%rdx 3b: 4c rex.WR 3c: 8b .byte 0x8b 3d: 83 .byte 0x83 3e: 98 cwtl ... Code starting with the faulting instruction =========================================== 0: 48 83 bb a0 00 00 00 cmpq $0x0,0xa0(%rbx) 7: 00 8: 74 e5 je 0xffffffffffffffef a: 48 8b 93 88 00 00 00 mov 0x88(%rbx),%rdx 11: 4c rex.WR 12: 8b .byte 0x8b 13: 83 .byte 0x83 14: 98 cwtl ... [ 0.053312][ T0] RSP: 0000:ffffffff97e03db0 EFLAGS: 00010046 [ 0.053951][ T0] RAX: ffffffffffffffff RBX: 0000000000000000 RCX: 000000000000009f [ 0.054709][ T0] RDX: ffffffff98f78840 RSI: 0000000000000000 RDI: 0000000000000001 [ 0.055337][ T0] RBP: 0000000000000000 R08: ffffffff97e03dbc R09: ffffffff97e03db8 [ 0.056136][ T0] R10: 0000000000000400 R11: ffffffff97e03dc0 R12: ffff9ed3fffc8dc0 [ 0.056982][ T0] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 0.057803][ T0] FS: 0000000000000000(0000) GS:ffffffff98981000(0000) knlGS:0000000000000000 [ 0.058701][ T0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 0.059394][ T0] CR2: 00000000000000a0 CR3: 000000006dc1e000 CR4: 00000000000000b0 [ 0.060163][ T0] Call Trace: [ 0.060450][ T0] [ 0.060723][ T0] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434) [ 0.061134][ T0] ? page_fault_oops (arch/x86/mm/fault.c:715) [ 0.061646][ T0] ? exc_page_fault (arch/x86/include/asm/irqflags.h:37 arch/x86/include/asm/irqflags.h:92 arch/x86/mm/fault.c:1489 arch/x86/mm/fault.c:1539) [ 0.062151][ T0] ? asm_exc_page_fault (arch/x86/include/asm/idtentry.h:623) [ 0.062699][ T0] ? memmap_init (mm/mm_init.c:952) [ 0.063176][ T0] ? free_area_init (include/linux/bitmap.h:446 include/linux/nodemask.h:241 include/linux/nodemask.h:438 mm/mm_init.c:646 mm/mm_init.c:1862) [ 0.063695][ T0] ? zone_sizes_init (arch/x86/mm/init.c:1008) [ 0.064168][ T0] ? setup_arch (arch/x86/kernel/setup.c:1132) [ 0.064550][ T0] ? start_kernel (init/main.c:927) [ 0.064974][ T0] ? x86_64_start_reservations (arch/x86/kernel/head64.c:495) [ 0.065489][ T0] ? x86_64_start_kernel (arch/x86/kernel/head64.c:437 (discriminator 5)) [ 0.065915][ T0] ? common_startup_64 (arch/x86/kernel/head_64.S:414) [ 0.066436][ T0] [ 0.066737][ T0] Modules linked in: [ 0.067130][ T0] CR2: 00000000000000a0 [ 0.067567][ T0] ---[ end trace 0000000000000000 ]--- [ 0.068122][ T0] RIP: 0010:memmap_init (mm/mm_init.c:952) [ 0.068647][ T0] Code: 63 d2 6a 01 6a 00 e8 62 8a b7 fd 5a 59 4c 39 e5 0f 82 c8 00 00 00 4c 89 f5 41 83 c7 01 48 81 c3 00 06 00 00 41 83 ff 05 74 49 <48> 83 bb a0 00 00 00 00 74 e5 48 8b 93 88 00 00 00 4c 8b 83 98 00 All code ======== 0: 63 d2 movslq %edx,%edx 2: 6a 01 pushq $0x1 4: 6a 00 pushq $0x0 6: e8 62 8a b7 fd callq 0xfffffffffdb78a6d b: 5a pop %rdx c: 59 pop %rcx d: 4c 39 e5 cmp %r12,%rbp 10: 0f 82 c8 00 00 00 jb 0xde 16: 4c 89 f5 mov %r14,%rbp 19: 41 83 c7 01 add $0x1,%r15d 1d: 48 81 c3 00 06 00 00 add $0x600,%rbx 24: 41 83 ff 05 cmp $0x5,%r15d 28: 74 49 je 0x73 2a:* 48 83 bb a0 00 00 00 cmpq $0x0,0xa0(%rbx) <-- trapping instruction 31: 00 32: 74 e5 je 0x19 34: 48 8b 93 88 00 00 00 mov 0x88(%rbx),%rdx 3b: 4c rex.WR 3c: 8b .byte 0x8b 3d: 83 .byte 0x83 3e: 98 cwtl ... Code starting with the faulting instruction =========================================== 0: 48 83 bb a0 00 00 00 cmpq $0x0,0xa0(%rbx) 7: 00 8: 74 e5 je 0xffffffffffffffef a: 48 8b 93 88 00 00 00 mov 0x88(%rbx),%rdx 11: 4c rex.WR 12: 8b .byte 0x8b 13: 83 .byte 0x83 14: 98 cwtl The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20241020/202410202212.b63f1e37-oliver.sang@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki