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_get_inode_loc:4930: inode #15: block 8: comm syz.0.0: unable to read itable block
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:6255: IO failure
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_dirty_inode:6459: inode #15: comm syz.0.0: mark_inode_dirty error
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:228: comm syz.0.0: Error while async write back metadata
EXT4-fs (loop0): I/O error while writing superblock
EXT4-fs error (device loop0): ext4_check_bdev_write_error:228: comm syz.0.0: Error while async write back metadata
EXT4-fs (loop0): I/O error while writing superblock
getblk(): invalid block size 1024 requested
logical block size: 32768
CPU: 0 UID: 0 PID: 5324 Comm: syz.0.0 Not tainted 6.15.0-syzkaller-10769-g7d4e49a77d99 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 __getblk_slow fs/buffer.c:1133 [inline]
 bdev_getblk+0x5b0/0x690 fs/buffer.c:1467
 __getblk include/linux/buffer_head.h:382 [inline]
 sb_getblk include/linux/buffer_head.h:388 [inline]
 ext4_alloc_branch fs/ext4/indirect.c:357 [inline]
 ext4_ind_map_blocks+0x10c1/0x21b0 fs/ext4/indirect.c:635
 ext4_map_create_blocks fs/ext4/inode.c:611 [inline]
 ext4_map_blocks+0x8d8/0x18d0 fs/ext4/inode.c:813
 mpage_map_one_extent fs/ext4/inode.c:2348 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2401 [inline]
 ext4_do_writepages+0x1703/0x3f30 fs/ext4/inode.c:2863
 ext4_writepages+0x205/0x350 fs/ext4/inode.c:2953
 do_writepages+0x32b/0x550 mm/page-writeback.c:2636
 filemap_fdatawrite_wbc mm/filemap.c:386 [inline]
 __filemap_fdatawrite_range mm/filemap.c:419 [inline]
 file_write_and_wait_range+0x22c/0x330 mm/filemap.c:794
 generic_buffers_fsync_noflush+0x6c/0x180 fs/buffer.c:609
 ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline]
 ext4_sync_file+0x332/0xb20 fs/ext4/fsync.c:147
 generic_write_sync include/linux/fs.h:3027 [inline]
 ext4_buffered_write_iter+0x2ca/0x3a0 fs/ext4/file.c:305
 ext4_file_write_iter+0x298/0x1bc0 fs/ext4/file.c:-1
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x54b/0xa90 fs/read_write.c:686
 ksys_pwrite64 fs/read_write.c:793 [inline]
 __do_sys_pwrite64 fs/read_write.c:801 [inline]
 __se_sys_pwrite64 fs/read_write.c:798 [inline]
 __x64_sys_pwrite64+0x193/0x220 fs/read_write.c:798
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f02e538e969
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f02e6150038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f02e55b6160 RCX: 00007f02e538e969
RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000069
RBP: 00007f02e5410ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fecc R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f02e55b6160 R15: 00007ffd78f7e6d8
 </TASK>
EXT4-fs error (device loop0): ext4_check_bdev_write_error:228: comm syz.0.0: Error while async write back metadata
EXT4-fs (loop0): I/O error while writing superblock
EXT4-fs error (device loop0): ext4_check_bdev_write_error:228: comm syz.0.0: Error while async write back metadata
------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:4685!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5324 Comm: syz.0.0 Not tainted 6.15.0-syzkaller-10769-g7d4e49a77d99 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4685
Code: e8 c4 4a ab ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 20 c1 47 ff 90 0f 0b e8 18 c1 47 ff 90 0f 0b e8 10 c1 47 ff 90 <0f> 0b e8 08 c1 47 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000d3a6a48 EFLAGS: 00010293
RAX: ffffffff827879d0 RBX: 00000000fffffffe RCX: ffff88800064a440
RDX: 0000000000000000 RSI: 0000000000000041 RDI: 000000000000003f
RBP: 1ffff110085ff022 R08: ffff888042ff9333 R09: 1ffff110085ff266
R10: dffffc0000000000 R11: ffffed10085ff267 R12: 0000000000000000
R13: 0000000000000041 R14: 1ffff110085ff269 R15: ffff888042ff9348
FS:  00007f02e61506c0(0000) GS:ffff88808d25f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563b9c3eb168 CR3: 00000000432eb000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_mb_use_preallocated+0x660/0x13f0 fs/ext4/mballoc.c:4902
 ext4_mb_new_blocks+0x5b4/0x46a0 fs/ext4/mballoc.c:6206
 ext4_alloc_branch fs/ext4/indirect.c:340 [inline]
 ext4_ind_map_blocks+0xe21/0x21b0 fs/ext4/indirect.c:635
 ext4_map_create_blocks fs/ext4/inode.c:611 [inline]
 ext4_map_blocks+0x8d8/0x18d0 fs/ext4/inode.c:813
 mpage_map_one_extent fs/ext4/inode.c:2348 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2401 [inline]
 ext4_do_writepages+0x1703/0x3f30 fs/ext4/inode.c:2863
 ext4_writepages+0x205/0x350 fs/ext4/inode.c:2953
 do_writepages+0x32b/0x550 mm/page-writeback.c:2636
 filemap_fdatawrite_wbc mm/filemap.c:386 [inline]
 __filemap_fdatawrite_range mm/filemap.c:419 [inline]
 file_write_and_wait_range+0x22c/0x330 mm/filemap.c:794
 generic_buffers_fsync_noflush+0x6c/0x180 fs/buffer.c:609
 ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline]
 ext4_sync_file+0x332/0xb20 fs/ext4/fsync.c:147
 generic_write_sync include/linux/fs.h:3027 [inline]
 ext4_buffered_write_iter+0x2ca/0x3a0 fs/ext4/file.c:305
 ext4_file_write_iter+0x298/0x1bc0 fs/ext4/file.c:-1
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x54b/0xa90 fs/read_write.c:686
 ksys_pwrite64 fs/read_write.c:793 [inline]
 __do_sys_pwrite64 fs/read_write.c:801 [inline]
 __se_sys_pwrite64 fs/read_write.c:798 [inline]
 __x64_sys_pwrite64+0x193/0x220 fs/read_write.c:798
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f02e538e969
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f02e6150038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f02e55b6160 RCX: 00007f02e538e969
RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000069
RBP: 00007f02e5410ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fecc R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f02e55b6160 R15: 00007ffd78f7e6d8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4685
Code: e8 c4 4a ab ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 20 c1 47 ff 90 0f 0b e8 18 c1 47 ff 90 0f 0b e8 10 c1 47 ff 90 <0f> 0b e8 08 c1 47 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000d3a6a48 EFLAGS: 00010293
RAX: ffffffff827879d0 RBX: 00000000fffffffe RCX: ffff88800064a440
RDX: 0000000000000000 RSI: 0000000000000041 RDI: 000000000000003f
RBP: 1ffff110085ff022 R08: ffff888042ff9333 R09: 1ffff110085ff266
R10: dffffc0000000000 R11: ffffed10085ff267 R12: 0000000000000000
R13: 0000000000000041 R14: 1ffff110085ff269 R15: ffff888042ff9348
FS:  00007f02e61506c0(0000) GS:ffff88808d25f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563b9c3eb168 CR3: 00000000432eb000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400