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[ 21.328503][ T1] NET: Registered PF_INET6 protocol family [ 21.412618][ T1] IPv6: Attempt to unregister permanent protocol 6 [ 21.433405][ T1] IPv6: Attempt to unregister permanent protocol 136 [ 21.443410][ T1] IPv6: Attempt to unregister permanent protocol 17 [ 22.737430][ T1] Oops: general protection fault, probably for non-canonical address 0xdffffc00000001a0: 0000 [#1] SMP KASAN [ 22.738764][ T1] KASAN: null-ptr-deref in range [0x0000000000000d00-0x0000000000000d07] [ 22.739736][ T1] CPU: 1 UID: 0 PID: 1 Comm: systemd Tainted: G T 6.12.0-rc6-01246-gf7f52738637f #1 [ 22.740972][ T1] Tainted: [T]=RANDSTRUCT [ 22.741513][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 22.742641][ T1] RIP: 0010:neigh_flush_dev.llvm.6395807810224103582 (kbuild/src/consumer/net/core/neighbour.c:380) [ 22.743530][ T1] Code: c1 e8 03 42 8a 04 38 84 c0 0f 85 15 05 00 00 31 c0 41 83 3e 0a 0f 94 c0 48 8d 1c c3 48 81 c3 f8 0c 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 f7 49 93 fe 4c 8b 3b 4d 85 ff 0f All code ======== 0: c1 e8 03 shr $0x3,%eax 3: 42 8a 04 38 mov (%rax,%r15,1),%al 7: 84 c0 test %al,%al 9: 0f 85 15 05 00 00 jne 0x524 f: 31 c0 xor %eax,%eax 11: 41 83 3e 0a cmpl $0xa,(%r14) 15: 0f 94 c0 sete %al 18: 48 8d 1c c3 lea (%rbx,%rax,8),%rbx 1c: 48 81 c3 f8 0c 00 00 add $0xcf8,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax 2a:* 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 f7 49 93 fe call 0xfffffffffe934a30 39: 4c 8b 3b mov (%rbx),%r15 3c: 4d 85 ff test %r15,%r15 3f: 0f .byte 0xf Code starting with the faulting instruction =========================================== 0: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) 5: 74 08 je 0xf 7: 48 89 df mov %rbx,%rdi a: e8 f7 49 93 fe call 0xfffffffffe934a06 f: 4c 8b 3b mov (%rbx),%r15 12: 4d 85 ff test %r15,%r15 15: 0f .byte 0xf [ 22.745585][ T1] RSP: 0000:ffff88810026f408 EFLAGS: 00010206 [ 22.746292][ T1] RAX: 00000000000001a0 RBX: 0000000000000d00 RCX: 0000000000000000 [ 22.747239][ T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffc0631640 [ 22.748176][ T1] RBP: ffff88810026f470 R08: 0000000000000000 R09: 0000000000000000 [ 22.749092][ T1] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 22.750004][ T1] R13: ffffffffc0625250 R14: ffffffffc0631640 R15: dffffc0000000000 [ 22.750956][ T1] FS: 00007f575cb83940(0000) GS:ffff8883aee00000(0000) knlGS:0000000000000000 [ 22.752016][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.752799][ T1] CR2: 00007f575db40008 CR3: 00000002bf936000 CR4: 00000000000406f0 [ 22.753770][ T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 22.754687][ T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 22.755620][ T1] Call Trace: [ 22.756076][ T1] [ 22.756491][ T1] ? show_regs (kbuild/src/consumer/arch/x86/kernel/dumpstack.c:?) [ 22.757025][ T1] ? __die_body.llvm.18112809324785033505 (kbuild/src/consumer/arch/x86/kernel/dumpstack.c:421) [ 22.757760][ T1] ? die_addr (kbuild/src/consumer/arch/x86/kernel/dumpstack.c:?) [ 22.758289][ T1] ? exc_general_protection (kbuild/src/consumer/arch/x86/kernel/traps.c:751) The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250720/202507200931.7a89ecd8-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki