Hello, syzbot found the following issue on: HEAD commit: 38fec10eb60d Linux 6.14 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14e2c804580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d09c42ff97b8ce6d dashboard link: https://syzkaller.appspot.com/bug?extid=d14b2bea87fe2aaffa3b 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=12e2c804580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16548bb0580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/cbcaba398075/disk-38fec10e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7fb19649d944/vmlinux-38fec10e.xz kernel image: https://storage.googleapis.com/syzbot-assets/3481a0b0218e/bzImage-38fec10e.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/47937005d435/mount_0.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=13d1a43f980000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d14b2bea87fe2aaffa3b@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ kernel BUG at fs/ext4/extents.c:4487! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 0 UID: 0 PID: 5851 Comm: syz-executor285 Not tainted 6.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:ext4_alloc_file_blocks+0xeb5/0xec0 fs/ext4/extents.c:4487 Code: b0 ff e9 86 f3 ff ff 44 89 e9 80 e1 07 fe c1 38 c1 0f 8c d3 f3 ff ff 4c 89 ef e8 96 16 b0 ff e9 c6 f3 ff ff e8 6c 5e 4b ff 90 <0f> 0b e8 14 ac 8a 09 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc9000409fae0 EFLAGS: 00010293 RAX: ffffffff82768104 RBX: 0000000000000000 RCX: ffff888034465a00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000409fca0 R08: ffffffff827673ea R09: 1ffff1100f07400a R10: dffffc0000000000 R11: ffffed100f07400b R12: ffff8880783a02b0 R13: 0000000000000003 R14: 0000000000000011 R15: 0000004210000000 FS: 00007f6218e926c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055db3ed07680 CR3: 000000007c366000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ext4_zero_range+0x48a/0xd70 fs/ext4/extents.c:4637 ext4_fallocate+0x54a/0x1ea0 fs/ext4/extents.c:4787 vfs_fallocate+0x623/0x7a0 fs/open.c:338 ksys_fallocate fs/open.c:362 [inline] __do_sys_fallocate fs/open.c:367 [inline] __se_sys_fallocate fs/open.c:365 [inline] __x64_sys_fallocate+0xbc/0x110 fs/open.c:365 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6218efc939 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 18 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:00007f6218e92218 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f6218f836d8 RCX: 00007f6218efc939 RDX: 0000000000000002 RSI: 0000000000000010 RDI: 0000000000000004 RBP: 00007f6218f836d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000007fff R11: 0000000000000246 R12: 00007f6218f5089c R13: 0000200000001000 R14: 0000200000000000 R15: 0000200000000f80 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ext4_alloc_file_blocks+0xeb5/0xec0 fs/ext4/extents.c:4487 Code: b0 ff e9 86 f3 ff ff 44 89 e9 80 e1 07 fe c1 38 c1 0f 8c d3 f3 ff ff 4c 89 ef e8 96 16 b0 ff e9 c6 f3 ff ff e8 6c 5e 4b ff 90 <0f> 0b e8 14 ac 8a 09 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc9000409fae0 EFLAGS: 00010293 RAX: ffffffff82768104 RBX: 0000000000000000 RCX: ffff888034465a00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000409fca0 R08: ffffffff827673ea R09: 1ffff1100f07400a R10: dffffc0000000000 R11: ffffed100f07400b R12: ffff8880783a02b0 R13: 0000000000000003 R14: 0000000000000011 R15: 0000004210000000 FS: 00007f6218e926c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6210aff000 CR3: 000000007c366000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- 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
