loop0: rw=8534017, sector=2, nr_sectors = 2 limit=1 Buffer I/O error on dev loop0, logical block 1, lost sync page write EXT4-fs (loop0): I/O error while writing superblock EXT4-fs error (device loop0) in ext4_reserve_inode_write:7459: Out of memory syz.0.0: attempt to access beyond end of device loop0: rw=8534017, sector=2, nr_sectors = 2 limit=1 Buffer I/O error on dev loop0, logical block 1, lost sync page write EXT4-fs (loop0): I/O error while writing superblock EXT4-fs error (device loop0): ext4_da_do_write_end:3412: inode #15: comm syz.0.0: mark_inode_dirty error syz.0.0: attempt to access beyond end of device loop0: rw=8534017, sector=2, nr_sectors = 2 limit=1 Buffer I/O error on dev loop0, logical block 1, lost sync page write EXT4-fs (loop0): I/O error while writing superblock EXT4-fs error (device loop0): ext4_check_bdev_write_error:239: comm syz.0.0: Error while async write back metadata syz.0.0: attempt to access beyond end of device loop0: rw=8534017, sector=2, nr_sectors = 2 limit=1 Buffer I/O error on dev loop0, logical block 1, lost sync page write EXT4-fs (loop0): I/O error while writing superblock EXT4-fs error (device loop0): ext4_check_bdev_write_error:239: comm syz.0.0: Error while async write back metadata syz.0.0: attempt to access beyond end of device loop0: rw=8534017, sector=2, nr_sectors = 2 limit=1 Buffer I/O error on dev loop0, logical block 1, lost sync page write EXT4-fs (loop0): I/O error while writing superblock EXT4-fs error (device loop0) in ext4_reserve_inode_write:7459: Out of memory syz.0.0: attempt to access beyond end of device loop0: rw=8534017, sector=2, nr_sectors = 2 limit=1 Buffer I/O error on dev loop0, logical block 1, lost sync page write EXT4-fs (loop0): I/O error while writing superblock EXT4-fs error (device loop0): ext4_splice_branch:479: inode #15: comm syz.0.0: mark_inode_dirty error syz.0.0: attempt to access beyond end of device loop0: rw=8534017, sector=2, nr_sectors = 2 limit=1 Buffer I/O error on dev loop0, logical block 1, lost sync page write EXT4-fs (loop0): I/O error while writing superblock EXT4-fs error (device loop0): ext4_check_bdev_write_error:239: comm syz.0.0: Error while async write back metadata syz.0.0: attempt to access beyond end of device loop0: rw=8534017, sector=2, nr_sectors = 2 limit=1 Buffer I/O error on dev loop0, logical block 1, lost sync page write EXT4-fs (loop0): I/O error while writing superblock EXT4-fs error (device loop0): ext4_check_bdev_write_error:239: comm syz.0.0: Error while async write back metadata syz.0.0: attempt to access beyond end of device loop0: rw=8534017, sector=2, nr_sectors = 2 limit=1 Buffer I/O error on dev loop0, logical block 1, lost sync page write EXT4-fs warning (device loop0): ext4_end_bio:367: I/O error 10 writing to inode 15 starting block 69) 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 ------------[ cut here ]------------ kernel BUG at fs/ext4/mballoc.c:4779! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5347 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+0x6bf/0x720 fs/ext4/mballoc.c:4779 Code: e8 b6 32 a0 ff 48 ba 00 00 00 00 00 fc ff df e9 d7 fa ff ff e8 a2 8f 27 ff 90 0f 0b e8 9a 8f 27 ff 90 0f 0b e8 92 8f 27 ff 90 <0f> 0b e8 8a 8f 27 ff 90 0f 0b 48 8b 0c 24 48 83 c1 54 80 e1 07 80 RSP: 0018:ffffc9000f786a40 EFLAGS: 00010283 RAX: ffffffff82a1919e RBX: 00000000fffffffe RCX: 0000000000100000 RDX: ffffc9000eeea000 RSI: 00000000000106fd RDI: 00000000000106fe RBP: 1ffff11008b920d2 R08: ffff888045c94e13 R09: 1ffff11008b929c2 R10: dffffc0000000000 R11: ffffed1008b929c3 R12: 0000000000000000 R13: 0000000000000034 R14: 1ffff11008b929c5 R15: ffff888045c94e28 FS: 00007ff3614376c0(0000) GS:ffff88808aa01000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000014521000 CR4: 0000000000352ef0 Call Trace: ext4_mb_use_preallocated+0x638/0x13e0 fs/ext4/mballoc.c:4996 ext4_mb_new_blocks+0x596/0x4520 fs/ext4/mballoc.c:6300 ext4_alloc_branch fs/ext4/indirect.c:340 [inline] ext4_ind_map_blocks+0xef3/0x2300 fs/ext4/indirect.c:652 ext4_map_create_blocks+0xbb/0x530 fs/ext4/inode.c:699 ext4_map_blocks+0xe8e/0x1c60 fs/ext4/inode.c:942 mpage_map_one_extent fs/ext4/inode.c:2505 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2601 [inline] ext4_do_writepages+0x1978/0x44a0 fs/ext4/inode.c:3077 ext4_writepages+0x1fe/0x4e0 fs/ext4/inode.c:3171 do_writepages+0x338/0x560 mm/page-writeback.c:2560 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 ext4_sync_file+0x252/0xa40 fs/ext4/fsync.c:145 generic_write_sync include/linux/fs.h:2695 [inline] ext4_buffered_write_iter+0x471/0x540 fs/ext4/file.c:378 ext4_file_write_iter+0xae4/0x1cd0 fs/ext4/file.c:-1 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff36059f559 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:00007ff361436fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ff360825fa0 RCX: 00007ff36059f559 RDX: 000000000000ff86 RSI: 0000200000017ec0 RDI: 0000000000000008 RBP: 00007ff360636b50 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff360826038 R14: 00007ff360825fa0 R15: 00007ffc06de30a8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ext4_mb_use_inode_pa+0x6bf/0x720 fs/ext4/mballoc.c:4779 Code: e8 b6 32 a0 ff 48 ba 00 00 00 00 00 fc ff df e9 d7 fa ff ff e8 a2 8f 27 ff 90 0f 0b e8 9a 8f 27 ff 90 0f 0b e8 92 8f 27 ff 90 <0f> 0b e8 8a 8f 27 ff 90 0f 0b 48 8b 0c 24 48 83 c1 54 80 e1 07 80 RSP: 0018:ffffc9000f786a40 EFLAGS: 00010283 RAX: ffffffff82a1919e RBX: 00000000fffffffe RCX: 0000000000100000 RDX: ffffc9000eeea000 RSI: 00000000000106fd RDI: 00000000000106fe RBP: 1ffff11008b920d2 R08: ffff888045c94e13 R09: 1ffff11008b929c2 R10: dffffc0000000000 R11: ffffed1008b929c3 R12: 0000000000000000 R13: 0000000000000034 R14: 1ffff11008b929c5 R15: ffff888045c94e28 FS: 00007ff3614376c0(0000) GS:ffff88808aa01000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000014521000 CR4: 0000000000352ef0