syz.0.0: attempt to access beyond end of device loop0: rw=2049, sector=130, nr_sectors = 24 limit=64 EXT4-fs warning (device loop0): ext4_end_bio:373: I/O error 10 writing to inode 20 starting block 65) Buffer I/O error on device loop0, logical block 65 Buffer I/O error on device loop0, logical block 66 Buffer I/O error on device loop0, logical block 67 Buffer I/O error on device loop0, logical block 68 Buffer I/O error on device loop0, logical block 69 Buffer I/O error on device loop0, logical block 70 Buffer I/O error on device loop0, logical block 71 Buffer I/O error on device loop0, logical block 72 Buffer I/O error on device loop0, logical block 73 Buffer I/O error on device loop0, logical block 74 EXT4-fs error (device loop0): ext4_do_update_inode:5569: inode #20: comm syz.0.0: corrupted inode contents EXT4-fs error (device loop0): ext4_dirty_inode:6450: inode #20: comm syz.0.0: mark_inode_dirty error EXT4-fs error (device loop0): ext4_do_update_inode:5569: inode #20: comm syz.0.0: corrupted inode contents EXT4-fs error (device loop0): ext4_dirty_inode:6450: inode #20: comm syz.0.0: mark_inode_dirty error EXT4-fs error (device loop0): ext4_do_update_inode:5569: inode #20: comm syz.0.0: corrupted inode contents EXT4-fs error (device loop0): ext4_dirty_inode:6450: inode #20: comm syz.0.0: mark_inode_dirty error ------------[ cut here ]------------ kernel BUG at fs/ext4/mballoc.c:4786! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5322 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4786 Code: e8 74 3a a4 ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 f0 63 38 ff 90 0f 0b e8 e8 63 38 ff 90 0f 0b e8 e0 63 38 ff 90 <0f> 0b e8 d8 63 38 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc9000f6fe9e8 EFLAGS: 00010287 RAX: ffffffff828d4df0 RBX: 00000000ffffffd8 RCX: 0000000000100000 RDX: ffffc90020001000 RSI: 000000000000d759 RDI: 000000000000d75a RBP: 1ffff11008f5bad2 R08: ffff888047ae1b5b R09: 1ffff11008f5c36b R10: dffffc0000000000 R11: ffffed1008f5c36c R12: 0000000000000000 R13: 0000000000000034 R14: 1ffff11008f5c36e R15: ffff888047ae1b70 FS: 00007f8a384066c0(0000) GS:ffff88808ca51000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8a377ed6b8 CR3: 000000001212f000 CR4: 0000000000352ef0 Call Trace: ext4_mb_use_preallocated+0x660/0x13f0 fs/ext4/mballoc.c:5003 ext4_mb_new_blocks+0x5e2/0x4780 fs/ext4/mballoc.c:6307 ext4_alloc_branch fs/ext4/indirect.c:340 [inline] ext4_ind_map_blocks+0xe96/0x22c0 fs/ext4/indirect.c:635 ext4_map_create_blocks+0xc1/0x540 fs/ext4/inode.c:618 ext4_map_blocks+0x7cd/0x11d0 fs/ext4/inode.c:809 mpage_map_one_extent fs/ext4/inode.c:2373 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2467 [inline] ext4_do_writepages+0x1916/0x46e0 fs/ext4/inode.c:2925 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3019 do_writepages+0x32e/0x550 mm/page-writeback.c:2554 filemap_writeback mm/filemap.c:387 [inline] filemap_fdatawrite_range mm/filemap.c:412 [inline] file_write_and_wait_range+0x36e/0x440 mm/filemap.c:786 generic_buffers_fsync_noflush+0x70/0x1d0 fs/buffer.c:606 ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline] ext4_sync_file+0x321/0xb70 fs/ext4/fsync.c:147 generic_write_sync include/linux/fs.h:2640 [inline] ext4_buffered_write_iter+0x2ca/0x3a0 fs/ext4/file.c:306 ext4_file_write_iter+0x298/0x1bf0 fs/ext4/file.c:-1 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x61d/0xb90 fs/read_write.c:688 ksys_write+0x150/0x270 fs/read_write.c:740 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8a3759c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8a38405fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f8a37816090 RCX: 00007f8a3759c799 RDX: 000000000000fea7 RSI: 0000200000000200 RDI: 000000000000000b RBP: 00007f8a37632c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8a37816128 R14: 00007f8a37816090 R15: 00007ffd9dd65198 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4786 Code: e8 74 3a a4 ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 f0 63 38 ff 90 0f 0b e8 e8 63 38 ff 90 0f 0b e8 e0 63 38 ff 90 <0f> 0b e8 d8 63 38 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc9000f6fe9e8 EFLAGS: 00010287 RAX: ffffffff828d4df0 RBX: 00000000ffffffd8 RCX: 0000000000100000 RDX: ffffc90020001000 RSI: 000000000000d759 RDI: 000000000000d75a RBP: 1ffff11008f5bad2 R08: ffff888047ae1b5b R09: 1ffff11008f5c36b R10: dffffc0000000000 R11: ffffed1008f5c36c R12: 0000000000000000 R13: 0000000000000034 R14: 1ffff11008f5c36e R15: ffff888047ae1b70 FS: 00007f8a384066c0(0000) GS:ffff88808ca51000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8a377ed6b8 CR3: 000000001212f000 CR4: 0000000000352ef0