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X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA2PR11MB5129 X-OriginatorOrg: intel.com Hello, kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on: commit: f88b128151dde0b6ba7d08205332bee9a8c1f6e6 ("mm/huge_memory: mark PMD mappings of the huge zero folio special") https://github.com/davidhildenbrand/linux vm_normal_page_pud in testcase: trinity version: trinity-i386-abe9de86-1_20230429 with following parameters: runtime: 300s group: group-04 nr_groups: 5 config: x86_64-kexec compiler: clang-20 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G (please refer to attached dmesg/kmsg for entire log/backtrace) +---------------------------------------------+------------+------------+ | | 10dad5703c | f88b128151 | +---------------------------------------------+------------+------------+ | BUG:kernel_NULL_pointer_dereference,address | 0 | 15 | | Oops | 0 | 15 | | RIP:pgtable_trans_huge_withdraw | 0 | 15 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 15 | +---------------------------------------------+------------+------------+ 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/202508071600.24367189-lkp@intel.com [ 21.150662][ T6837] BUG: kernel NULL pointer dereference, address: 0000000000000008 [ 21.151683][ T6837] #PF: supervisor read access in kernel mode [ 21.152397][ T6837] #PF: error_code(0x0000) - not-present page [ 21.153123][ T6837] PGD 0 P4D 0 [ 21.153581][ T6837] Oops: Oops: 0000 [#1] SMP PTI [ 21.154184][ T6837] CPU: 0 UID: 65534 PID: 6837 Comm: trinity-subchil Not tainted 6.16.0-rc5-00474-gf88b128151dd #1 PREEMPT(voluntary) [ 21.155572][ T6837] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 21.156778][ T6837] RIP: 0010:pgtable_trans_huge_withdraw (mm/pgtable-generic.c:188) [ 21.157555][ T6837] Code: 52 01 eb 07 48 2b 3d 73 50 2f 01 48 01 cf 48 c1 ef 0c 48 c1 e7 06 83 7c 3a 28 00 0f 84 81 00 00 00 48 8b 44 3a 10 4c 8d 40 08 <4c> 8b 48 08 4d 8d 51 f8 45 31 db 4d 39 c1 4d 0f 45 da 4c 89 5c 3a All code ======== 0: 52 push %rdx 1: 01 eb add %ebp,%ebx 3: 07 (bad) 4: 48 2b 3d 73 50 2f 01 sub 0x12f5073(%rip),%rdi # 0x12f507e b: 48 01 cf add %rcx,%rdi e: 48 c1 ef 0c shr $0xc,%rdi 12: 48 c1 e7 06 shl $0x6,%rdi 16: 83 7c 3a 28 00 cmpl $0x0,0x28(%rdx,%rdi,1) 1b: 0f 84 81 00 00 00 je 0xa2 21: 48 8b 44 3a 10 mov 0x10(%rdx,%rdi,1),%rax 26: 4c 8d 40 08 lea 0x8(%rax),%r8 2a:* 4c 8b 48 08 mov 0x8(%rax),%r9 <-- trapping instruction 2e: 4d 8d 51 f8 lea -0x8(%r9),%r10 32: 45 31 db xor %r11d,%r11d 35: 4d 39 c1 cmp %r8,%r9 38: 4d 0f 45 da cmovne %r10,%r11 3c: 4c rex.WR 3d: 89 .byte 0x89 3e: 5c pop %rsp 3f: 3a .byte 0x3a Code starting with the faulting instruction =========================================== 0: 4c 8b 48 08 mov 0x8(%rax),%r9 4: 4d 8d 51 f8 lea -0x8(%r9),%r10 8: 45 31 db xor %r11d,%r11d b: 4d 39 c1 cmp %r8,%r9 e: 4d 0f 45 da cmovne %r10,%r11 12: 4c rex.WR 13: 89 .byte 0x89 14: 5c pop %rsp 15: 3a .byte 0x3a [ 21.159714][ T6837] RSP: 0000:ffffc900008afad8 EFLAGS: 00010202 [ 21.160436][ T6837] RAX: 0000000000000000 RBX: ffff88816002d400 RCX: ffff8881e3b0d000 [ 21.161394][ T6837] RDX: ffffea0000000000 RSI: ffff888163b0dff0 RDI: 00000000058ec340 [ 21.162349][ T6837] RBP: ffffea00058ec368 R08: 0000000000000008 R09: 00000000ffc00000 [ 21.163306][ T6837] R10: ffffc900008afd98 R11: 0000000000000000 R12: ffff8881638e36c0 [ 21.164254][ T6837] R13: ffff888163b0dff0 R14: ffffffffffffffff R15: 8000000168000285 [ 21.165217][ T6837] FS: 0000000000000000(0000) GS:ffff8884ac421000(0000) knlGS:0000000000000000 [ 21.166267][ T6837] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 21.167042][ T6837] CR2: 0000000000000008 CR3: 0000000002a30000 CR4: 00000000000406f0 [ 21.168005][ T6837] Call Trace: [ 21.169754][ T6837] [ 21.170186][ T6837] zap_deposited_table (mm/huge_memory.c:2148) [ 21.170803][ T6837] zap_huge_pmd (include/linux/spinlock.h:391 mm/huge_memory.c:?) [ 21.171359][ T6837] unmap_page_range (mm/memory.c:1787) [ 21.171968][ T6837] ? perf_event_set_state (kernel/events/core.c:?) [ 21.172615][ T6837] unmap_vmas (mm/memory.c:1968) [ 21.173161][ T6837] exit_mmap (mm/mmap.c:1280) [ 21.173698][ T6837] __mmput (kernel/fork.c:1125) [ 21.174859][ T6837] exit_mm (arch/x86/include/asm/bitops.h:206 arch/x86/include/asm/bitops.h:238 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/thread_info.h:126 kernel/exit.c:582) [ 21.175398][ T6837] do_exit (kernel/exit.c:954) [ 21.175925][ T6837] do_group_exit (kernel/exit.c:1105) [ 21.176483][ T6837] __ia32_sys_exit_group (kernel/exit.c:1116) [ 21.177126][ T6837] ia32_sys_call (??:?) [ 21.177723][ T6837] do_int80_emulation (arch/x86/entry/syscall_32.c:?) [ 21.178337][ T6837] ? arch_exit_to_user_mode_prepare (arch/x86/include/asm/entry-common.h:?) [ 21.179060][ T6837] asm_int80_emulation (arch/x86/include/asm/idtentry.h:626) [ 21.179668][ T6837] RIP: 0023:0xf7f89092 [ 21.180191][ T6837] Code: Unable to access opcode bytes at 0xf7f89068. Code starting with the faulting instruction =========================================== [ 21.180982][ T6837] RSP: 002b:00000000fffe2f18 EFLAGS: 00000292 ORIG_RAX: 00000000000000fc [ 21.181980][ T6837] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000fffe2ec2 [ 21.182935][ T6837] RDX: 0000000000000000 RSI: 000000000000000b RDI: 0000000000000000 [ 21.183884][ T6837] RBP: 00000000f732f000 R08: 0000000000000000 R09: 0000000000000000 [ 21.184854][ T6837] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 21.185806][ T6837] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 21.186779][ T6837] [ 21.187196][ T6837] Modules linked in: can_bcm can_raw can cn scsi_transport_iscsi ipmi_msghandler sr_mod cdrom sg ata_generic fuse [ 21.188570][ T6837] CR2: 0000000000000008 [ 21.189109][ T6837] ---[ end trace 0000000000000000 ]--- [ 21.189767][ T6837] RIP: 0010:pgtable_trans_huge_withdraw (mm/pgtable-generic.c:188) [ 21.190523][ T6837] Code: 52 01 eb 07 48 2b 3d 73 50 2f 01 48 01 cf 48 c1 ef 0c 48 c1 e7 06 83 7c 3a 28 00 0f 84 81 00 00 00 48 8b 44 3a 10 4c 8d 40 08 <4c> 8b 48 08 4d 8d 51 f8 45 31 db 4d 39 c1 4d 0f 45 da 4c 89 5c 3a All code ======== 0: 52 push %rdx 1: 01 eb add %ebp,%ebx 3: 07 (bad) 4: 48 2b 3d 73 50 2f 01 sub 0x12f5073(%rip),%rdi # 0x12f507e b: 48 01 cf add %rcx,%rdi e: 48 c1 ef 0c shr $0xc,%rdi 12: 48 c1 e7 06 shl $0x6,%rdi 16: 83 7c 3a 28 00 cmpl $0x0,0x28(%rdx,%rdi,1) 1b: 0f 84 81 00 00 00 je 0xa2 21: 48 8b 44 3a 10 mov 0x10(%rdx,%rdi,1),%rax 26: 4c 8d 40 08 lea 0x8(%rax),%r8 2a:* 4c 8b 48 08 mov 0x8(%rax),%r9 <-- trapping instruction 2e: 4d 8d 51 f8 lea -0x8(%r9),%r10 32: 45 31 db xor %r11d,%r11d 35: 4d 39 c1 cmp %r8,%r9 38: 4d 0f 45 da cmovne %r10,%r11 3c: 4c rex.WR 3d: 89 .byte 0x89 3e: 5c pop %rsp 3f: 3a .byte 0x3a Code starting with the faulting instruction =========================================== 0: 4c 8b 48 08 mov 0x8(%rax),%r9 4: 4d 8d 51 f8 lea -0x8(%r9),%r10 8: 45 31 db xor %r11d,%r11d b: 4d 39 c1 cmp %r8,%r9 e: 4d 0f 45 da cmovne %r10,%r11 12: 4c rex.WR 13: 89 .byte 0x89 14: 5c pop %rsp 15: 3a .byte 0x3a The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250807/202508071600.24367189-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki