Hello, syzbot found the following issue on: HEAD commit: 528dd46d0fc3 Merge tag 'net-6.10-rc8-2' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14f9d0f1980000 kernel config: https://syzkaller.appspot.com/x/.config?x=38e374b1a3185897 dashboard link: https://syzkaller.appspot.com/bug?extid=33287c327c3bcd4ea552 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/01b3c6d9bec7/disk-528dd46d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7db1f2513396/vmlinux-528dd46d.xz kernel image: https://storage.googleapis.com/syzbot-assets/cfae1c808981/bzImage-528dd46d.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+33287c327c3bcd4ea552@xxxxxxxxxxxxxxxxxxxxxxxxx Oops: general protection fault, probably for non-canonical address 0xdffffc0000000084: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000420-0x0000000000000427] CPU: 1 PID: 37 Comm: khugepaged Not tainted 6.10.0-rc7-syzkaller-00254-g528dd46d0fc3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:khugepaged_scan_mm_slot mm/khugepaged.c:2365 [inline] RIP: 0010:khugepaged_do_scan mm/khugepaged.c:2498 [inline] RIP: 0010:khugepaged+0x8ec/0x1820 mm/khugepaged.c:2554 Code: e8 39 6d 9d ff 83 44 24 14 01 e9 9b f8 ff ff e8 2a 6d 9d ff 49 8d 7c 24 20 48 b9 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 <80> 3c 08 00 0f 85 ad 0d 00 00 49 8d 7c 24 70 49 8b 6c 24 20 48 b9 RSP: 0018:ffffc90000ad7ce8 EFLAGS: 00010217 RAX: 0000000000000084 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffff88801bae9e00 RSI: ffffffff81f1c0f6 RDI: 0000000000000426 RBP: 0000000028100077 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000406 R13: 0000000000000200 R14: 1ffff9200015afaf R15: 0000000000000007 FS: 0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020027000 CR3: 000000006a590000 CR4: 0000000000350ef0 Call Trace: <TASK> kthread+0x2c4/0x3a0 kernel/kthread.c:389 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:khugepaged_scan_mm_slot mm/khugepaged.c:2365 [inline] RIP: 0010:khugepaged_do_scan mm/khugepaged.c:2498 [inline] RIP: 0010:khugepaged+0x8ec/0x1820 mm/khugepaged.c:2554 Code: e8 39 6d 9d ff 83 44 24 14 01 e9 9b f8 ff ff e8 2a 6d 9d ff 49 8d 7c 24 20 48 b9 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 <80> 3c 08 00 0f 85 ad 0d 00 00 49 8d 7c 24 70 49 8b 6c 24 20 48 b9 RSP: 0018:ffffc90000ad7ce8 EFLAGS: 00010217 RAX: 0000000000000084 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffff88801bae9e00 RSI: ffffffff81f1c0f6 RDI: 0000000000000426 RBP: 0000000028100077 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000406 R13: 0000000000000200 R14: 1ffff9200015afaf R15: 0000000000000007 FS: 0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2eb1cff8 CR3: 000000001fc08000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: e8 39 6d 9d ff call 0xff9d6d3e 5: 83 44 24 14 01 addl $0x1,0x14(%rsp) a: e9 9b f8 ff ff jmp 0xfffff8aa f: e8 2a 6d 9d ff call 0xff9d6d3e 14: 49 8d 7c 24 20 lea 0x20(%r12),%rdi 19: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 20: fc ff df 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 0f 85 ad 0d 00 00 jne 0xde1 34: 49 8d 7c 24 70 lea 0x70(%r12),%rdi 39: 49 8b 6c 24 20 mov 0x20(%r12),%rbp 3e: 48 rex.W 3f: b9 .byte 0xb9 --- 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
