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Message-ID: <695faa63.050a0220.1c677c.039b.GAE@google.com> Date: Thu, 08 Jan 2026 05:00:19 -0800 From: syzbot <syzbot+b4a2af3000eaa84d95d5@...kaller.appspotmail.com> To: clm@...com, dsterba@...e.com, josef@...icpanda.com, linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [btrfs?] general protection fault in create_empty_buffers (5) Hello, syzbot found the following issue on: HEAD commit: f0b9d8eb98df Merge tag 'nfsd-6.19-3' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1311ef92580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a11e0f726bfb6765 dashboard link: https://syzkaller.appspot.com/bug?extid=b4a2af3000eaa84d95d5 compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10663e9a580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14936074580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-f0b9d8eb.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d6eefae97e89/vmlinux-f0b9d8eb.xz kernel image: https://storage.googleapis.com/syzbot-assets/a16fafcc4238/bzImage-f0b9d8eb.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b4a2af3000eaa84d95d5@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 2 UID: 0 PID: 6261 Comm: syz.0.73 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:create_empty_buffers+0x4d/0x480 fs/buffer.c:1694 Code: ec 6d ff 48 89 de ba 40 8c 40 00 4c 89 ef e8 0a f6 ff ff 49 89 c6 48 89 c3 eb 03 48 89 c3 e8 ea eb 6d ff 48 89 d8 48 c1 e8 03 <80> 3c 28 00 0f 85 81 03 00 00 48 8d 7b 08 4c 09 23 48 89 f8 48 c1 RSP: 0018:ffffc9000408f870 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8250f7ec RDX: ffff88802a4d8000 RSI: ffffffff8250fcc6 RDI: ffff88802a4d9680 RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: ffff88802a4d8b30 R12: 0000000000000000 R13: ffffea0000a9e5c0 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f1ac84a46c0(0000) GS:ffff8880d6af5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1ac84a3f98 CR3: 000000002b14f000 CR4: 0000000000352ef0 Call Trace: <TASK> folio_create_buffers+0x109/0x150 fs/buffer.c:1802 block_read_full_folio+0x14c/0x850 fs/buffer.c:2403 filemap_read_folio+0xc8/0x2a0 mm/filemap.c:2496 do_read_cache_folio+0x266/0x5c0 mm/filemap.c:4096 do_read_cache_page mm/filemap.c:4162 [inline] read_cache_page_gfp+0x29/0x120 mm/filemap.c:4195 btrfs_read_disk_super+0x192/0x500 fs/btrfs/volumes.c:1367 btrfs_scan_one_device+0x109/0x820 fs/btrfs/volumes.c:1475 btrfs_get_tree_super fs/btrfs/super.c:1860 [inline] btrfs_get_tree_subvol fs/btrfs/super.c:2089 [inline] btrfs_get_tree+0x5b3/0x2710 fs/btrfs/super.c:2123 vfs_get_tree+0x8e/0x330 fs/super.c:1751 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3636 [inline] do_new_mount fs/namespace.c:3712 [inline] path_mount+0x7bf/0x23a0 fs/namespace.c:4022 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount fs/namespace.c:4201 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4201 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1ac758f7c9 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:00007f1ac84a4038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f1ac77e6090 RCX: 00007f1ac758f7c9 RDX: 00002000000000c0 RSI: 0000200000000080 RDI: 00002000000001c0 RBP: 00007f1ac7613f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000004418 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1ac77e6128 R14: 00007f1ac77e6090 R15: 00007ffe5d1bb9d8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:create_empty_buffers+0x4d/0x480 fs/buffer.c:1694 Code: ec 6d ff 48 89 de ba 40 8c 40 00 4c 89 ef e8 0a f6 ff ff 49 89 c6 48 89 c3 eb 03 48 89 c3 e8 ea eb 6d ff 48 89 d8 48 c1 e8 03 <80> 3c 28 00 0f 85 81 03 00 00 48 8d 7b 08 4c 09 23 48 89 f8 48 c1 RSP: 0018:ffffc9000408f870 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8250f7ec RDX: ffff88802a4d8000 RSI: ffffffff8250fcc6 RDI: ffff88802a4d9680 RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: ffff88802a4d8b30 R12: 0000000000000000 R13: ffffea0000a9e5c0 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f1ac84a46c0(0000) GS:ffff8880d6af5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1ac84a3f98 CR3: 000000002b14f000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: ec in (%dx),%al 1: 6d insl (%dx),%es:(%rdi) 2: ff 48 89 decl -0x77(%rax) 5: de ba 40 8c 40 00 fidivrs 0x408c40(%rdx) b: 4c 89 ef mov %r13,%rdi e: e8 0a f6 ff ff call 0xfffff61d 13: 49 89 c6 mov %rax,%r14 16: 48 89 c3 mov %rax,%rbx 19: eb 03 jmp 0x1e 1b: 48 89 c3 mov %rax,%rbx 1e: e8 ea eb 6d ff call 0xff6dec0d 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction 2e: 0f 85 81 03 00 00 jne 0x3b5 34: 48 8d 7b 08 lea 0x8(%rbx),%rdi 38: 4c 09 23 or %r12,(%rbx) 3b: 48 89 f8 mov %rdi,%rax 3e: 48 rex.W 3f: c1 .byte 0xc1 --- 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@...glegroups.com. 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
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