syzbot has found a reproducer for the following issue on: HEAD commit: 8689f4f2ea56 Merge tag 'mmc-v6.5-2' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12b9cb02a80000 kernel config: https://syzkaller.appspot.com/x/.config?x=7ad417033279f15a dashboard link: https://syzkaller.appspot.com/bug?extid=0f4d9f68fb6632330c6c compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13977778a80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1004666aa80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/21b63023cf5a/disk-8689f4f2.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e04836fe057e/vmlinux-8689f4f2.xz kernel image: https://storage.googleapis.com/syzbot-assets/ee05dfd52843/bzImage-8689f4f2.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/e2ab005f1edb/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0f4d9f68fb6632330c6c@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ kernel BUG at fs/ext4/ext4_extents.h:200! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 5885 Comm: syz-executor219 Not tainted 6.4.0-syzkaller-12365-g8689f4f2ea56 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 RIP: 0010:ext4_ext_mark_unwritten fs/ext4/ext4_extents.h:200 [inline] RIP: 0010:ext4_split_extent_at+0xd11/0xe10 fs/ext4/extents.c:3221 Code: e9 d2 f8 ff ff e8 1f 6d 5d ff 66 81 c5 00 80 e9 32 fd ff ff e8 10 6d 5d ff 44 8d bd 00 80 ff ff e9 d1 fc ff ff e8 ff 6c 5d ff <0f> 0b 48 8b 7c 24 18 e8 73 9d b0 ff e9 7f f3 ff ff 48 89 cf e8 46 RSP: 0018:ffffc900055ef268 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88807d9c0000 RSI: ffffffff82277271 RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88807587d00c R13: 0000000000000000 R14: 0000000000000000 R15: ffff88807587d012 FS: 00007f4820ae9700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4820ae8fe8 CR3: 0000000028105000 CR4: 0000000000350ee0 Call Trace: <TASK> ext4_split_extent+0x3fc/0x530 fs/ext4/extents.c:3384 ext4_ext_handle_unwritten_extents fs/ext4/extents.c:3874 [inline] ext4_ext_map_blocks+0x2e22/0x5bc0 fs/ext4/extents.c:4166 ext4_map_blocks+0x760/0x1890 fs/ext4/inode.c:621 ext4_iomap_alloc fs/ext4/inode.c:3276 [inline] ext4_iomap_begin+0x43d/0x7a0 fs/ext4/inode.c:3326 iomap_iter+0x446/0x10e0 fs/iomap/iter.c:91 __iomap_dio_rw+0x6e3/0x1d80 fs/iomap/direct-io.c:574 iomap_dio_rw+0x40/0xa0 fs/iomap/direct-io.c:665 ext4_dio_write_iter fs/ext4/file.c:609 [inline] ext4_file_write_iter+0x1102/0x1880 fs/ext4/file.c:720 call_write_iter include/linux/fs.h:1871 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x981/0xda0 fs/read_write.c:584 ksys_write+0x122/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4828f26cd9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4820ae9208 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000034 RCX: 00007f4828f26cd9 RDX: 0000000000000012 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00007f4828fa4790 R08: 00007f4828fa4798 R09: 00007f4828fa4798 R10: 00007f4828fa4798 R11: 0000000000000246 R12: 00007f4828fa479c R13: 00007ffef851f96f R14: 00007f4820ae9300 R15: 0000000000022000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ext4_ext_mark_unwritten fs/ext4/ext4_extents.h:200 [inline] RIP: 0010:ext4_split_extent_at+0xd11/0xe10 fs/ext4/extents.c:3221 Code: e9 d2 f8 ff ff e8 1f 6d 5d ff 66 81 c5 00 80 e9 32 fd ff ff e8 10 6d 5d ff 44 8d bd 00 80 ff ff e9 d1 fc ff ff e8 ff 6c 5d ff <0f> 0b 48 8b 7c 24 18 e8 73 9d b0 ff e9 7f f3 ff ff 48 89 cf e8 46 RSP: 0018:ffffc900055ef268 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88807d9c0000 RSI: ffffffff82277271 RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88807587d00c R13: 0000000000000000 R14: 0000000000000000 R15: ffff88807587d012 FS: 00007f4820ae9700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffef85799a0 CR3: 0000000028105000 CR4: 0000000000350ee0 --- 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.
