Hello, syzbot found the following issue on: HEAD commit: 8568bb2ccc27 Add linux-next specific files for 20240405 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=152f4805180000 kernel config: https://syzkaller.appspot.com/x/.config?x=48ca5acf8d2eb3bc dashboard link: https://syzkaller.appspot.com/bug?extid=57adb2a4b9d206521bc2 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1268258d180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1256598d180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1d120b5e779c/disk-8568bb2c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a89e3589a585/vmlinux-8568bb2c.xz kernel image: https://storage.googleapis.com/syzbot-assets/045e657c0e0d/bzImage-8568bb2c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+57adb2a4b9d206521bc2@xxxxxxxxxxxxxxxxxxxxxxxxx Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 5080 Comm: syz-executor931 Not tainted 6.9.0-rc2-next-20240405-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:PageTail include/linux/page-flags.h:284 [inline] RIP: 0010:const_folio_flags include/linux/page-flags.h:312 [inline] RIP: 0010:folio_test_locked include/linux/page-flags.h:512 [inline] RIP: 0010:collapse_file mm/khugepaged.c:1907 [inline] RIP: 0010:hpage_collapse_scan_file+0x1ea3/0x63e0 mm/khugepaged.c:2292 Code: 48 8d bc 24 30 02 00 00 e8 9a a1 f9 ff 4c 8b bc 24 30 02 00 00 49 8d 5f 08 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 6f a1 f9 ff 48 8b 1b 48 89 de 48 83 RSP: 0018:ffffc9000340f420 EFLAGS: 00010247 RAX: 0000000000000000 RBX: 0000000000000006 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000340f7d0 R08: ffffffff81cb9212 R09: 1ffffffff1f5802d R10: dffffc0000000000 R11: fffffbfff1f5802e R12: ffffc9000340f6b0 R13: 0000000000000000 R14: ffffc9000340f5f0 R15: fffffffffffffffe FS: 000055558dc18380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000240 CR3: 000000006ee40000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> madvise_collapse+0x561/0xcc0 mm/khugepaged.c:2736 madvise_vma_behavior mm/madvise.c:1081 [inline] madvise_walk_vmas mm/madvise.c:1255 [inline] do_madvise+0xc3c/0x44a0 mm/madvise.c:1441 __do_sys_madvise mm/madvise.c:1456 [inline] __se_sys_madvise mm/madvise.c:1454 [inline] __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:1454 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x72/0x7a RIP: 0033:0x7f4cdb4292e9 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff99038cd8 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007fff99038eb8 RCX: 00007f4cdb4292e9 RDX: 0000000000000019 RSI: 0000000000600722 RDI: 0000000020000000 RBP: 00007f4cdb49c610 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff99038ea8 R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:PageTail include/linux/page-flags.h:284 [inline] RIP: 0010:const_folio_flags include/linux/page-flags.h:312 [inline] RIP: 0010:folio_test_locked include/linux/page-flags.h:512 [inline] RIP: 0010:collapse_file mm/khugepaged.c:1907 [inline] RIP: 0010:hpage_collapse_scan_file+0x1ea3/0x63e0 mm/khugepaged.c:2292 Code: 48 8d bc 24 30 02 00 00 e8 9a a1 f9 ff 4c 8b bc 24 30 02 00 00 49 8d 5f 08 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 6f a1 f9 ff 48 8b 1b 48 89 de 48 83 RSP: 0018:ffffc9000340f420 EFLAGS: 00010247 RAX: 0000000000000000 RBX: 0000000000000006 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000340f7d0 R08: ffffffff81cb9212 R09: 1ffffffff1f5802d R10: dffffc0000000000 R11: fffffbfff1f5802e R12: ffffc9000340f6b0 R13: 0000000000000000 R14: ffffc9000340f5f0 R15: fffffffffffffffe FS: 000055558dc18380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000240 CR3: 000000006ee40000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 48 8d bc 24 30 02 00 lea 0x230(%rsp),%rdi 7: 00 8: e8 9a a1 f9 ff call 0xfff9a1a7 d: 4c 8b bc 24 30 02 00 mov 0x230(%rsp),%r15 14: 00 15: 49 8d 5f 08 lea 0x8(%r15),%rbx 19: 48 89 d8 mov %rbx,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 48 89 df mov %rbx,%rdi 33: e8 6f a1 f9 ff call 0xfff9a1a7 38: 48 8b 1b mov (%rbx),%rbx 3b: 48 89 de mov %rbx,%rsi 3e: 48 rex.W 3f: 83 .byte 0x83 --- 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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
