Hello, syzbot found the following issue on: HEAD commit: be5d4872e528 Add linux-next specific files for 20250905 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=17896962580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a726684450a7d788 dashboard link: https://syzkaller.appspot.com/bug?extid=b253ade8e1751d90a7a9 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10496962580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14a98962580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f67121360b62/disk-be5d4872.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4f666ca2e57f/vmlinux-be5d4872.xz kernel image: https://storage.googleapis.com/syzbot-assets/e86b794b985e/bzImage-be5d4872.xz The issue was bisected to: commit db076b5db550aa34169dceee81d0974c7b2a2482 Author: David Hildenbrand <david@xxxxxxxxxx> Date: Mon Sep 1 15:03:40 2025 +0000 mm/gup: remove record_subpages() bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15a0b312580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=17a0b312580000 console output: https://syzkaller.appspot.com/x/log.txt?x=13a0b312580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b253ade8e1751d90a7a9@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: db076b5db550 ("mm/gup: remove record_subpages()") Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 1 UID: 0 PID: 6063 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:_compound_head include/linux/page-flags.h:284 [inline] RIP: 0010:__bio_iov_iter_get_pages block/bio.c:1258 [inline] RIP: 0010:bio_iov_iter_get_pages+0x5b2/0x11c0 block/bio.c:1336 Code: 9c 24 20 01 00 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 0c c9 7c fd 48 8b 1b 4c 8d 73 08 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 ef c8 7c fd 4d 8b 3e 4c 89 fe 48 RSP: 0018:ffffc90002f773e0 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff88807bfd0000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90002f77590 R08: 0000000000000000 R09: ffffffff84a7d3b5 R10: dffffc0000000000 R11: fffff94000329b51 R12: dffffc0000000000 R13: ffff888078cd0294 R14: 0000000000000008 R15: 00000000000000f0 FS: 0000555567d13500(0000) GS:ffff888125af9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9a3134c000 CR3: 0000000074d2a000 CR4: 00000000003526f0 Call Trace: <TASK> __blkdev_direct_IO+0x60b/0xee0 block/fops.c:215 blkdev_direct_IO+0x120f/0x1730 block/fops.c:434 blkdev_direct_write+0x7c/0x140 block/fops.c:719 blkdev_write_iter+0x547/0x710 block/fops.c:787 aio_write+0x535/0x7a0 fs/aio.c:1634 __io_submit_one fs/aio.c:-1 [inline] io_submit_one+0x78b/0x1310 fs/aio.c:2053 __do_sys_io_submit fs/aio.c:2112 [inline] __se_sys_io_submit+0x185/0x2f0 fs/aio.c:2082 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9a3058ebe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdf48caa48 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1 RAX: ffffffffffffffda RBX: 00007f9a307c5fa0 RCX: 00007f9a3058ebe9 RDX: 00002000000000c0 RSI: 00000000000000f3 RDI: 00007f9a3134c000 RBP: 00007f9a30611e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9a307c5fa0 R14: 00007f9a307c5fa0 R15: 0000000000000003 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:_compound_head include/linux/page-flags.h:284 [inline] RIP: 0010:__bio_iov_iter_get_pages block/bio.c:1258 [inline] RIP: 0010:bio_iov_iter_get_pages+0x5b2/0x11c0 block/bio.c:1336 Code: 9c 24 20 01 00 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 0c c9 7c fd 48 8b 1b 4c 8d 73 08 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 ef c8 7c fd 4d 8b 3e 4c 89 fe 48 RSP: 0018:ffffc90002f773e0 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff88807bfd0000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90002f77590 R08: 0000000000000000 R09: ffffffff84a7d3b5 R10: dffffc0000000000 R11: fffff94000329b51 R12: dffffc0000000000 R13: ffff888078cd0294 R14: 0000000000000008 R15: 00000000000000f0 FS: 0000555567d13500(0000) GS:ffff8881259f9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe8453cfd8 CR3: 0000000074d2a000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 9c pushf 1: 24 20 and $0x20,%al 3: 01 00 add %eax,(%rax) 5: 00 48 89 add %cl,-0x77(%rax) 8: d8 48 c1 fmuls -0x3f(%rax) b: e8 03 42 80 3c call 0x3c804213 10: 20 00 and %al,(%rax) 12: 74 08 je 0x1c 14: 48 89 df mov %rbx,%rdi 17: e8 0c c9 7c fd call 0xfd7cc928 1c: 48 8b 1b mov (%rbx),%rbx 1f: 4c 8d 73 08 lea 0x8(%rbx),%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 ef c8 7c fd call 0xfd7cc928 39: 4d 8b 3e mov (%r14),%r15 3c: 4c 89 fe mov %r15,%rsi 3f: 48 rex.W --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection 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
