EXT4-fs error (device loop4): ext4_map_blocks:718: inode #15: comm syz.4.178: lblock 0 mapped to illegal pblock 0 (length 6)
EXT4-fs (loop4): Delayed block allocation failed for inode 15 at logical offset 0 with max blocks 6 with error 117
EXT4-fs (loop4): This should not happen!! Data will be lost
------------[ cut here ]------------
WARNING: CPU: 0 PID: 7064 at fs/ext4/inode.c:3583 ext4_dirty_folio+0x159/0x310 fs/ext4/inode.c:3583
Modules linked in:
CPU: 0 PID: 7064 Comm: syz.4.178 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:ext4_dirty_folio+0x159/0x310 fs/ext4/inode.c:3583
Code: 49 83 3f 00 74 1f e8 36 5a 53 ff 48 8b 3c 24 48 89 de 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d e9 ec 83 c9 ff e8 17 5a 53 ff <0f> 0b eb dd e8 0e 5a 53 ff 0f 0b eb af e8 05 5a 53 ff 48 89 df 48
RSP: 0018:ffffc9000599f588 EFLAGS: 00010293
RAX: ffffffff823236a9 RBX: ffffea00014015c0 RCX: ffff88802c1b0000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 1ffffd40002802b8 R08: ffffea00014015c7 R09: 1ffffd40002802b8
R10: dffffc0000000000 R11: fffff940002802b9 R12: dffffc0000000000
R13: 1ffffd40002802b9 R14: 0000000000000001 R15: ffffea00014015e8
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000006127b000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 set_page_dirty_lock+0xfc/0x2c0 mm/page-writeback.c:2825
 qp_release_pages+0x7c/0x390 drivers/misc/vmw_vmci/vmci_queue_pair.c:638
 qp_host_unregister_user_memory+0x8b/0x1d0 drivers/misc/vmw_vmci/vmci_queue_pair.c:723
 vmci_qp_broker_detach+0x5eb/0xf00 drivers/misc/vmw_vmci/vmci_queue_pair.c:2152
 ctx_free_ctx drivers/misc/vmw_vmci/vmci_context.c:444 [inline]
 kref_put include/linux/kref.h:65 [inline]
 vmci_ctx_put+0x5f0/0xbe0 drivers/misc/vmw_vmci/vmci_context.c:497
 vmci_host_close+0x9b/0x160 drivers/misc/vmw_vmci/vmci_host.c:143
 __fput+0x234/0x970 fs/file_table.c:384
 task_work_run+0x1ce/0x250 kernel/task_work.c:239
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0x90b/0x23c0 kernel/exit.c:883
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1024
 get_signal+0x12fc/0x1400 kernel/signal.c:2902
 arch_do_signal_or_restart+0x9c/0x7b0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f047b38f749
Code: Unable to access opcode bytes at 0x7f047b38f71f.
RSP: 002b:00007f047c2dc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffff8b RBX: 00007f047b5e6090 RCX: 00007f047b38f749
RDX: 0000000000000001 RSI: 00002000000001c0 RDI: 0000000000000004
RBP: 00007f047b413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000e7b R11: 0000000000000246 R12: 0000000000000000
R13: 00007f047b5e6128 R14: 00007f047b5e6090 R15: 00007ffc85fd9518
 </TASK>