IBM Informix Dynamic Server process blocked due to deadlock on ext4 filesystem mounted without a journal.

Issue

• IBM Informix Dynamic Server oninit process hanging, resulting in unresponsive/hung database connections due to deadlock on ext4 filesystem mounted without a journal.
• IBM Informix Dynamic Server oninit process blocked with the following call traces.

[428617.156430] INFO: task oninit:4327 blocked for more than 120 seconds.
[428617.156431]       Not tainted 4.18.0-425.10.1.el8_7.x86_64 #1
[428617.156433] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[428617.156433] task:oninit          state:D stack:    0 pid: 4327 ppid:  4300 flags:0x00004084
[428617.156436] Call Trace:
[428617.156437]  __schedule+0x2d1/0x860
[428617.156439]  ? blk_flush_plug_list+0xd7/0x100
[428617.156441]  schedule+0x35/0xa0
[428617.156443]  ext4_unwritten_wait+0x87/0xc0 [ext4]
[428617.156460]  ? finish_wait+0x80/0x80
[428617.156462]  ext4_file_write_iter+0x396/0x3e0 [ext4]
[428617.156478]  aio_write+0xf6/0x1c0
[428617.156480]  ? blk_mq_sched_insert_requests+0x6c/0xf0
[428617.156483]  ? io_submit_one+0x7e/0x3c0
[428617.156484]  ? kmem_cache_alloc+0x13f/0x280
[428617.156486]  io_submit_one+0x131/0x3c0
[428617.156488]  __x64_sys_io_submit+0xa2/0x180
[428617.156489]  ? syscall_trace_enter+0x1ff/0x2d0
[428617.156492]  do_syscall_64+0x5b/0x1b0
[428617.156494]  entry_SYSCALL_64_after_hwframe+0x61/0xc6
[428617.156497] RIP: 0033:0x7fd1d50409bd
[428617.156499] Code: Unable to access opcode bytes at RIP 0x7fd1d5040993.
[428617.156500] RSP: 002b:00000000531c4da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
[428617.156501] RAX: ffffffffffffffda RBX: 00007fd1d698ab78 RCX: 00007fd1d50409bd
[428617.156502] RDX: 00000000531c4de8 RSI: 0000000000000001 RDI: 00007fd1c4593000
[428617.156503] RBP: 00007fd1c4593000 R08: 00000001358df800 R09: 000000005667b8d8
[428617.156504] R10: ffffffffffffffe0 R11: 0000000000000246 R12: 0000000000000001
[428617.156505] R13: 0000000000000000 R14: 00000000531c4de8 R15: 000000005667b850
[..]
[428617.158050] Kernel panic - not syncing: hung_task: blocked tasks
[428617.158052] CPU: 7 PID: 126 Comm: khungtaskd Kdump: loaded Not tainted 4.18.0-425.10.1.el8_7.x86_64 #1
[428617.158053] Hardware name: VMware, Inc. VMware7,1/440BX Desktop Reference Platform, BIOS VMW71.00V.18227214.B64.2106252220 06/25/2021
[428617.158054] Call Trace:
[428617.158055]  dump_stack+0x41/0x60
[428617.158058]  panic+0xe7/0x2ac
[428617.158062]  watchdog+0x242/0x2f0
[428617.158065]  ? hungtask_pm_notify+0x50/0x50
[428617.158068]  kthread+0x10b/0x130
[428617.158070]  ? set_kthread_struct+0x50/0x50
[428617.158073]  ret_from_fork+0x1f/0x40