Hello, syzbot found the following issue on: HEAD commit: babe393974de Merge tag 'docs-6.7' of git://git.lwn.net/linux git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=176e7813680000 kernel config: https://syzkaller.appspot.com/x/.config?x=34994593e74fdcfe dashboard link: https://syzkaller.appspot.com/bug?extid=93e7c679006f0d4e6105 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/81ff19e40c77/disk-babe3939.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a92e6d2d9507/vmlinux-babe3939.xz kernel image: https://storage.googleapis.com/syzbot-assets/afd2bad18cfc/bzImage-babe3939.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+93e7c679006f0d4e6105@xxxxxxxxxxxxxxxxxxxxxxxxx netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'. general protection fault, probably for non-canonical address 0xdffffc000000001d: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000000e8-0x00000000000000ef] CPU: 1 PID: 15736 Comm: syz-executor.1 Not tainted 6.6.0-syzkaller-10265-gbabe393974de #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 RIP: 0010:__lock_acquire+0x109/0x5de0 kernel/locking/lockdep.c:5004 Code: 45 85 c9 0f 84 cc 0e 00 00 44 8b 05 21 dc 81 0b 45 85 c0 0f 84 be 0d 00 00 48 ba 00 00 00 00 00 fc ff df 4c 89 d1 48 c1 e9 03 <80> 3c 11 00 0f 85 e8 40 00 00 49 81 3a e0 09 b3 90 0f 84 96 0d 00 RSP: 0018:ffffc90003387378 EFLAGS: 00010006 RAX: ffff88801d5e9dc0 RBX: 1ffff92000670e9f RCX: 000000000000001d RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 00000000000000e8 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: 00000000000000e8 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 FS: 00007f07477fc6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000b80 CR3: 000000006a8b7000 CR4: 00000000003506f0 Call Trace: <TASK> lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718 down_read+0x9c/0x470 kernel/locking/rwsem.c:1526 hugetlb_vma_lock_read mm/hugetlb.c:274 [inline] hugetlb_vma_lock_read+0xae/0x100 mm/hugetlb.c:265 hugetlb_follow_page_mask+0x156/0xf20 mm/hugetlb.c:6500 follow_page_mask+0x49e/0xda0 mm/gup.c:824 __get_user_pages+0x366/0x1480 mm/gup.c:1237 __get_user_pages_locked mm/gup.c:1504 [inline] __gup_longterm_locked+0x755/0x2570 mm/gup.c:2198 pin_user_pages_remote+0xee/0x140 mm/gup.c:3346 process_vm_rw_single_vec mm/process_vm_access.c:105 [inline] process_vm_rw_core.constprop.0+0x43d/0xa10 mm/process_vm_access.c:215 process_vm_rw+0x2ff/0x360 mm/process_vm_access.c:283 __do_sys_process_vm_writev mm/process_vm_access.c:303 [inline] __se_sys_process_vm_writev mm/process_vm_access.c:298 [inline] __x64_sys_process_vm_writev+0xe2/0x1b0 mm/process_vm_access.c:298 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f0746a7cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f07477fc0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000137 RAX: ffffffffffffffda RBX: 00007f0746b9bf80 RCX: 00007f0746a7cae9 RDX: 0000000000000001 RSI: 0000000020000b80 RDI: 0000000000001d1b RBP: 00007f0746ac847a R08: 0000000000000001 R09: 0000000000000000 R10: 0000000020000f80 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f0746b9bf80 R15: 00007f0746cbfa48 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__lock_acquire+0x109/0x5de0 kernel/locking/lockdep.c:5004 Code: 45 85 c9 0f 84 cc 0e 00 00 44 8b 05 21 dc 81 0b 45 85 c0 0f 84 be 0d 00 00 48 ba 00 00 00 00 00 fc ff df 4c 89 d1 48 c1 e9 03 <80> 3c 11 00 0f 85 e8 40 00 00 49 81 3a e0 09 b3 90 0f 84 96 0d 00 RSP: 0018:ffffc90003387378 EFLAGS: 00010006 RAX: ffff88801d5e9dc0 RBX: 1ffff92000670e9f RCX: 000000000000001d RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 00000000000000e8 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: 00000000000000e8 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 FS: 00007f07477fc6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000b80 CR3: 000000006a8b7000 CR4: 00000000003506f0 ---------------- Code disassembly (best guess): 0: 45 85 c9 test %r9d,%r9d 3: 0f 84 cc 0e 00 00 je 0xed5 9: 44 8b 05 21 dc 81 0b mov 0xb81dc21(%rip),%r8d # 0xb81dc31 10: 45 85 c0 test %r8d,%r8d 13: 0f 84 be 0d 00 00 je 0xdd7 19: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 20: fc ff df 23: 4c 89 d1 mov %r10,%rcx 26: 48 c1 e9 03 shr $0x3,%rcx * 2a: 80 3c 11 00 cmpb $0x0,(%rcx,%rdx,1) <-- trapping instruction 2e: 0f 85 e8 40 00 00 jne 0x411c 34: 49 81 3a e0 09 b3 90 cmpq $0xffffffff90b309e0,(%r10) 3b: 0f .byte 0xf 3c: 84 .byte 0x84 3d: 96 xchg %eax,%esi 3e: 0d .byte 0xd --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
