Subject: Re: Bug Report with kernel 6.3.5

From: Bagas Sanjaya <[email-masked]>
Date: Sun, 4 Jun 2023 12:42:25 +0700

On Sun, Jun 04, 2023 at 07:51:36AM +0300, Martin Zaharinov wrote:
> Hi Team one bug report 
> 
> after upgrade from kernel 6.2.12 to 6.3.5 
> After fell hour system get this error.
> 
> If is possible to check.
> 
> 
> Jun  4 01:46:52  [12810.275218][  T587] INFO: task nginx:3977 blocked for more than 609 seconds.
> Jun  4 01:46:52  [12810.275350][  T587]       Tainted: G           O       6.3.5 #1
> Jun  4 01:46:52  [12810.275436][  T587] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> Jun  4 01:46:52  [12810.275527][  T587] task:nginx         state:D stack:0     pid:3977  ppid:1      flags:0x00000006
> Jun  4 01:46:52  [12810.275624][  T587] Call Trace:
> Jun  4 01:46:52  [12810.275707][  T587]  <TASK>
> Jun  4 01:46:52  [12810.275786][  T587]  __schedule+0x352/0x820
> Jun  4 01:46:52  [12810.275878][  T587]  schedule_preempt_disabled+0x61/0xe0
> Jun  4 01:46:52  [12810.275963][  T587]  __mutex_lock.constprop.0+0x481/0x7a0
> Jun  4 01:46:52  [12810.276049][  T587]  ? __lock_sock_fast+0x1a/0xc0
> Jun  4 01:46:52  [12810.276135][  T587]  ? lock_sock_nested+0x1a/0xc0
> Jun  4 01:46:52  [12810.276217][  T587]  ? inode_wait_for_writeback+0x77/0xd0
> Jun  4 01:46:52  [12810.276307][  T587]  eventpoll_release_file+0x41/0x90
> Jun  4 01:46:52  [12810.276416][  T587]  __fput+0x1d9/0x240
> Jun  4 01:46:52  [12810.276517][  T587]  task_work_run+0x51/0x80
> Jun  4 01:46:52  [12810.276624][  T587]  exit_to_user_mode_prepare+0x123/0x130
> Jun  4 01:46:52  [12810.276732][  T587]  syscall_exit_to_user_mode+0x21/0x110
> Jun  4 01:46:52  [12810.276847][  T587]  entry_SYSCALL_64_after_hwframe+0x46/0xb0
> Jun  4 01:46:52  [12810.276954][  T587] RIP: 0033:0x15037529155a
> Jun  4 01:46:52  [12810.277056][  T587] RSP: 002b:000015036bbb6400 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
> Jun  4 01:46:52  [12810.277185][  T587] RAX: 0000000000000000 RBX: 000015036bbb7420 RCX: 000015037529155a
> Jun  4 01:46:52  [12810.277311][  T587] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000013
> Jun  4 01:46:52  [12810.277440][  T587] RBP: 00001503647343d0 R08: 1999999999999999 R09: 0000000000000000
> Jun  4 01:46:52  [12810.277567][  T587] R10: 000015037531baa0 R11: 0000000000000293 R12: 0000000000000ba5
> Jun  4 01:46:52  [12810.277693][  T587] R13: 0000150348731f48 R14: 0000000000000000 R15: 000000001f5b06b0
> Jun  4 01:46:52  [12810.277820][  T587]  </TASK>
> 

Can you clearly describe this regression? And your nginx setup? And most
importantly, can you please bisect between v6.2 and v6.3 to find the
culprit? Can you also check the mainline?

Anyway, thanks for the regression report. I'm adding it to regzbot:

#regzbot ^introduced: v6.2.12..v6.3.5
#regzbot title: nginx blocked for more than 10 minutes on 6.3.5

-- 
An old man doll... just what I always wanted! - Clara