EXT4-fs error (device loop0) in ext4_reserve_inode_write:6383: Out of memory EXT4-fs error (device loop0): ext4_dirty_inode:6587: inode #16: comm syz.0.0: mark_inode_dirty error EXT4-fs error (device loop0) in ext4_reserve_inode_write:6383: Out of memory EXT4-fs error (device loop0): ext4_write_end:1481: inode #16: comm syz.0.0: mark_inode_dirty error syz.0.0: attempt to access beyond end of device loop0: rw=2049, sector=68, nr_sectors = 2 limit=64 EXT4-fs warning (device loop0): ext4_end_bio:372: I/O error 10 writing to inode 16 starting block 34) Buffer I/O error on device loop0, logical block 34 syz.0.0: attempt to access beyond end of device loop0: rw=2049, sector=506, nr_sectors = 4 limit=64 EXT4-fs warning (device loop0): ext4_end_bio:372: I/O error 10 writing to inode 16 starting block 253) Buffer I/O error on device loop0, logical block 253 Buffer I/O error on device loop0, logical block 254 syz.0.0: attempt to access beyond end of device loop0: rw=2049, sector=498, nr_sectors = 8 limit=64 EXT4-fs warning (device loop0): ext4_end_bio:372: I/O error 10 writing to inode 16 starting block 249) Buffer I/O error on device loop0, logical block 249 Buffer I/O error on device loop0, logical block 250 Buffer I/O error on device loop0, logical block 251 Buffer I/O error on device loop0, logical block 252 syz.0.0: attempt to access beyond end of device loop0: rw=2049, sector=82, nr_sectors = 2 limit=64 EXT4-fs warning (device loop0): ext4_end_bio:372: I/O error 10 writing to inode 16 starting block 41) Buffer I/O error on device loop0, logical block 41 ------------[ cut here ]------------ kernel BUG at fs/ext4/mballoc.c:4780! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5333 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:4780 Code: e8 14 91 a4 ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 d0 c5 37 ff 90 0f 0b e8 c8 c5 37 ff 90 0f 0b e8 c0 c5 37 ff 90 <0f> 0b e8 b8 c5 37 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc90005736788 EFLAGS: 00010287 RAX: ffffffff828e0b80 RBX: 00000000ffffffd2 RCX: 0000000000100000 RDX: ffffc90020802000 RSI: 0000000000010e52 RDI: 0000000000010e53 RBP: 1ffff110070dd498 R08: ffff8880386eec43 R09: 1ffff110070ddd88 R10: dffffc0000000000 R11: ffffed10070ddd89 R12: 0000000000000000 R13: 0000000000000037 R14: 1ffff110070ddd8b R15: ffff8880386eec58 FS: 00007fc0032626c0(0000) GS:ffff88808c881000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc00321ffe8 CR3: 000000003686a000 CR4: 0000000000352ef0 Call Trace: ext4_mb_use_preallocated+0x660/0x13f0 fs/ext4/mballoc.c:4997 ext4_mb_new_blocks+0x5e2/0x46c0 fs/ext4/mballoc.c:6301 ext4_ext_map_blocks+0x1515/0x5860 fs/ext4/extents.c:4461 ext4_map_create_blocks+0x11d/0x540 fs/ext4/inode.c:631 ext4_map_blocks+0x7cd/0x11d0 fs/ext4/inode.c:824 mpage_map_one_extent fs/ext4/inode.c:2396 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2490 [inline] ext4_do_writepages+0x229d/0x4670 fs/ext4/inode.c:2948 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3042 do_writepages+0x32e/0x550 mm/page-writeback.c:2571 filemap_writeback mm/filemap.c:388 [inline] filemap_fdatawrite_range mm/filemap.c:413 [inline] file_write_and_wait_range+0x36e/0x440 mm/filemap.c:787 mmb_fsync_noflush+0x76/0x1c0 fs/buffer.c:645 ext4_fsync_nojournal fs/ext4/fsync.c:92 [inline] ext4_sync_file+0x437/0xd50 fs/ext4/fsync.c:160 generic_write_sync include/linux/fs.h:2654 [inline] ext4_buffered_write_iter+0x2ca/0x3a0 fs/ext4/file.c:322 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+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc00239cdd9 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:00007fc003261fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fc002616180 RCX: 00007fc00239cdd9 RDX: 00000000fffffceb RSI: 00002000000001c0 RDI: 0000000000000005 RBP: 00007fc002432d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc002616218 R14: 00007fc002616180 R15: 00007fffc04b8568 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4780 Code: e8 14 91 a4 ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 d0 c5 37 ff 90 0f 0b e8 c8 c5 37 ff 90 0f 0b e8 c0 c5 37 ff 90 <0f> 0b e8 b8 c5 37 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc90005736788 EFLAGS: 00010287 RAX: ffffffff828e0b80 RBX: 00000000ffffffd2 RCX: 0000000000100000 RDX: ffffc90020802000 RSI: 0000000000010e52 RDI: 0000000000010e53 RBP: 1ffff110070dd498 R08: ffff8880386eec43 R09: 1ffff110070ddd88 R10: dffffc0000000000 R11: ffffed10070ddd89 R12: 0000000000000000 R13: 0000000000000037 R14: 1ffff110070ddd8b R15: ffff8880386eec58 FS: 00007fc0032626c0(0000) GS:ffff88808c881000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc00321ffe8 CR3: 000000003686a000 CR4: 0000000000352ef0