[Bug 261690] NFSv4 mount on Linux client hangs during complex access patterns (gcc bootstrapping on client)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261690

Carl Fer <carlos@reendex.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |carlos@reendex.com

--- Comment #4 from Carl Fer <carlos@reendex.com> ---
Facing a similar problem here on a client with Ubuntu 20.04.3 with
"5.4.0-100-generic" kernel:

kernel: [462910.890773] INFO: task php-fpm8.0:4123147 blocked for more than 120
seconds.
kernel: [462910.892885]       Not tainted 5.4.0-100-generic #113-Ubuntu
kernel: [462910.894329] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
kernel: [462910.896474] php-fpm8.0      D    0 4123147 4123143 0x00000324
kernel: [462910.896480] Call Trace:
kernel: [462910.896491]  __schedule+0x2e3/0x740
kernel: [462910.896496]  schedule+0x42/0xb0
kernel: [462910.896498]  io_schedule+0x16/0x40
kernel: [462910.896504]  wait_on_page_bit+0x11c/0x200
kernel: [462910.896507]  ? file_fdatawait_range+0x30/0x30
kernel: [462910.896512]  wait_on_page_writeback+0x43/0x90
kernel: [462910.896514]  __filemap_fdatawait_range+0x98/0x100
kernel: [462910.896518]  ? __filemap_fdatawrite_range+0xe1/0x110
kernel: [462910.896521]  filemap_write_and_wait+0x60/0xa0
kernel: [462910.896543]  nfs_wb_all+0x1f/0x130 [nfs]
kernel: [462910.896563]  nfs4_file_flush+0x73/0xa0 [nfsv4]
kernel: [462910.896567]  filp_close+0x37/0x70
kernel: [462910.896571]  __close_fd+0x7d/0xa0
kernel: [462910.896575]  elfcorehdr_read+0x40/0x40
kernel: [462910.896578]  do_syscall_64+0x57/0x190
kernel: [462910.896581]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
kernel: [462910.896588] RIP: 0033:0x7f1968ba5987
kernel: [462910.896593] Code: ff ff e8 9c 11 02 00 66 2e 0f 1f 84 00 00 00 00
00 66 90 f3 0f 1e fa 64 8b 04 25 18 00
 00 00 85 c0 75 10 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 41 c3 48 83 ec
18 89 7c 24 0c e8 c3 5d f8 ff
kernel: [462910.896595] RSP: 002b:00007fff9381d028 EFLAGS: 00000246 ORIG_RAX:
0000000000000003
kernel: [462910.896597] RAX: ffffffffffffffda RBX: 00007f19223529a0 RCX:
00007f1968ba5987
kernel: [462910.896598] RDX: 0000000000000000 RSI: 0000000000000001 RDI:
0000000000000009
kernel: [462910.896599] RBP: 00007f19223a3600 R08: 0000000000000001 R09:
00007f1966865380
kernel: [462910.896600] R10: 0000000000000000 R11: 0000000000000246 R12:
0000000000000000
kernel: [462910.896601] R13: 0000000000000000 R14: 0000000000000000 R15:
0000000000000001

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