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 kadqoTFQ 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 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: 1445ef3d5f2fefd1fcedb68cff3fff0a33994791 ("[PATCH 3/3] ptdesc: Account page tables to memcgs again") url: https://github.com/intel-lab-lkp/linux/commits/Matthew-Wilcox-Oracle/memcg-Add-memcg_stat_mod/20260226-003144 base: https://git.kernel.org/cgit/linux/kernel/git/akpm/mm.git mm-everything patch link: https://lore.kernel.org/all/20260225162319.315281-4-willy@infradead.org/ patch subject: [PATCH 3/3] ptdesc: Account page tables to memcgs again in testcase: boot config: x86_64-randconfig-r052-20250414 compiler: gcc-14 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 32G (please refer to attached dmesg/kmsg for entire log/backtrace) 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/202603051407.fde83fdb-lkp@intel.com [ 14.109191][ T1] BUG: kernel NULL pointer dereference, address: 0000000000000880 [ 14.109653][ T1] #PF: supervisor read access in kernel mode [ 14.109989][ T1] #PF: error_code(0x0000) - not-present page [ 14.110322][ T1] PGD 12a8ff067 P4D 12a8ff067 PUD 0 [ 14.110622][ T1] Oops: Oops: 0000 [#1] SMP [ 14.110878][ T1] CPU: 0 UID: 0 PID: 1 Comm: systemd Not tainted 7.0.0-rc1-00154-g1445ef3d5f2f #1 PREEMPT(full) [ 14.111462][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 14.112082][ T1] RIP: 0010:mem_cgroup_lruvec (include/linux/memcontrol.h:729 (discriminator 1)) [ 14.112396][ T1] Code: 74 09 48 8d 83 40 22 00 00 eb 1f 4d 85 e4 75 07 4c 8b 25 bd c3 1e 02 48 63 83 b8 1e 00 00 49 8b 84 c4 58 07 00 00 48 83 c0 40 <48> 39 98 40 08 00 00 74 07 48 89 98 40 08 00 00 5b 41 5c 5d c3 cc All code ======== 0: 74 09 je 0xb 2: 48 8d 83 40 22 00 00 lea 0x2240(%rbx),%rax 9: eb 1f jmp 0x2a b: 4d 85 e4 test %r12,%r12 e: 75 07 jne 0x17 10: 4c 8b 25 bd c3 1e 02 mov 0x21ec3bd(%rip),%r12 # 0x21ec3d4 17: 48 63 83 b8 1e 00 00 movslq 0x1eb8(%rbx),%rax 1e: 49 8b 84 c4 58 07 00 mov 0x758(%r12,%rax,8),%rax 25: 00 26: 48 83 c0 40 add $0x40,%rax 2a:* 48 39 98 40 08 00 00 cmp %rbx,0x840(%rax) <-- trapping instruction 31: 74 07 je 0x3a 33: 48 89 98 40 08 00 00 mov %rbx,0x840(%rax) 3a: 5b pop %rbx 3b: 41 5c pop %r12 3d: 5d pop %rbp 3e: c3 ret 3f: cc int3 Code starting with the faulting instruction =========================================== 0: 48 39 98 40 08 00 00 cmp %rbx,0x840(%rax) 7: 74 07 je 0x10 9: 48 89 98 40 08 00 00 mov %rbx,0x840(%rax) 10: 5b pop %rbx 11: 41 5c pop %r12 13: 5d pop %rbp 14: c3 ret 15: cc int3 [ 14.113448][ T1] RSP: 0018:ffff888101467c10 EFLAGS: 00210202 [ 14.113783][ T1] RAX: 0000000000000040 RBX: ffffffff83708880 RCX: 0000000000000001 [ 14.114217][ T1] RDX: 0000000000000001 RSI: ffffffff83708880 RDI: ffff88812a845f82 [ 14.114652][ T1] RBP: ffff888101467c20 R08: 0000000000000000 R09: 0000000000000000 [ 14.115087][ T1] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88812a845f82 [ 14.115979][ T1] R13: ffff888105fdd3a8 R14: ffff888105fdd740 R15: ffff888101442000 [ 14.116421][ T1] FS: 0000000000000000(0000) GS:ffff88889bc98000(0063) knlGS:00000000f72f8840 [ 14.116911][ T1] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 14.117276][ T1] CR2: 0000000000000880 CR3: 000000012b816000 CR4: 00000000000406f0 [ 14.117713][ T1] Call Trace: [ 14.117901][ T1] [ 14.118070][ T1] memcg_stat_mod (mm/memcontrol.c:804) [ 14.118328][ T1] __pagetable_ctor (include/linux/mm.h:3547) [ 14.118595][ T1] pgd_alloc (include/asm-generic/pgalloc.h:291 arch/x86/mm/pgtable.c:314 arch/x86/mm/pgtable.c:328) [ 14.118863][ T1] mm_init+0x210/0x390 [ 14.119129][ T1] dup_mm+0x45/0xe0 [ 14.119401][ T1] copy_process (kernel/fork.c:1587 (discriminator 1) kernel/fork.c:2228 (discriminator 1)) [ 14.119661][ T1] ? free_filename (fs/namei.c:148) [ 14.119930][ T1] kernel_clone (include/linux/random.h:26 kernel/fork.c:2660) [ 14.120200][ T1] __do_compat_sys_ia32_clone (arch/x86/kernel/sys_ia32.c:255) [ 14.120519][ T1] __ia32_compat_sys_ia32_clone (arch/x86/kernel/sys_ia32.c:240) [ 14.120837][ T1] ia32_sys_call (kbuild/obj/consumer/x86_64-randconfig-r052-20250414/./arch/x86/include/generated/asm/syscalls_32.h:121) [ 14.121105][ T1] __do_fast_syscall_32 (arch/x86/entry/syscall_32.c:83 arch/x86/entry/syscall_32.c:307) [ 14.121398][ T1] do_fast_syscall_32 (arch/x86/entry/syscall_32.c:332 (discriminator 1)) [ 14.121671][ T1] do_SYSENTER_32 (arch/x86/entry/syscall_32.c:371) [ 14.121926][ T1] entry_SYSENTER_compat_after_hwframe (arch/x86/entry/entry_64_compat.S:127) [ 14.122298][ T1] RIP: 0023:0xf7f9c38c [ 14.122527][ T1] Code: d2 74 05 c1 e8 0c 89 02 8b 5d fc 31 c0 c9 c3 cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 58 b8 All code ======== 0: d2 74 05 c1 shlb %cl,-0x3f(%rbp,%rax,1) 4: e8 0c 89 02 8b call 0xffffffff8b028915 9: 5d pop %rbp a: fc cld b: 31 c0 xor %eax,%eax d: c9 leave e: c3 ret f: cc int3 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 0f 1f 00 nopl (%rax) 21: 51 push %rcx 22: 52 push %rdx 23: 55 push %rbp 24: 89 e5 mov %esp,%ebp 26: 0f 34 sysenter 28: cd 80 int $0x80 2a:* 5d pop %rbp <-- trapping instruction 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 ret 2e: cc int3 2f: 90 nop 30: 90 nop 31: 90 nop 32: 90 nop 33: 90 nop 34: 90 nop 35: 90 nop 36: 90 nop 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 58 pop %rax 3f: b8 .byte 0xb8 Code starting with the faulting instruction =========================================== 0: 5d pop %rbp 1: 5a pop %rdx 2: 59 pop %rcx 3: c3 ret 4: cc int3 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 58 pop %rax 15: b8 .byte 0xb8 The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260305/202603051407.fde83fdb-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki