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Date:   Mon, 30 Oct 2023 23:05:45 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Đỗ Văn Ngọc (VF-KHTVPMDDT-TTTKLKDDT) 
        <v.ngocdv4@...fast.vn>
Cc:     "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: File system hung on kernel 4.14

On Mon, Oct 30, 2023 at 07:37:09AM +0000, Đỗ Văn Ngọc (VF-KHTVPMDDT-TTTKLKDDT) wrote:
> Dear Linux kernel ext4, Dear Ted,
> 
> We are developing project on Android 9 which used kernel 4.14.133
> version.
> And while normal using device, we have a issue device freezing and
> reboot after few minute.
> I checked the log and saw kernel hung on filesystem as below:

I've already replied to your first e-mail sent directly to me.  It
appears to be a hardware problem, or possibly a device driver issue.
But it's not a file system issue.  Basically, ext4 submitted an I/O,
and then calls io_schedule(), and I/O never completes....

    	       		      	      	    - Ted

[15159.874154] Call trace: 
[15159.874157] [<000000005e1d80e5>] __switch_to+0x94/0xd8 
[15159.874161] [<00000000a85c7184>] __schedule+0x274/0x940 
[15159.874163] [<00000000c9c2c8f0>] schedule+0x40/0xa8 
[15159.874167] [<00000000a97520e1>] io_schedule+0x20/0x40 
[15159.874175] [<000000008d5c36d0>] blk_mq_get_tag+0x194/0x340 
[15159.874178] [<00000000f97393cb>] blk_mq_get_request+0x164/0x3b0 
[15159.874181] [<00000000e69c8e58>] blk_mq_make_request+0xc8/0x6f8 
[15159.874187] [<00000000e88e7453>] generic_make_request+0xf4/0x288 
[15159.874190] [<0000000016cf2add>] submit_bio+0x5c/0x1d0 
[15159.874196] [<0000000097be4708>] ext4_io_submit+0x54/0x68 
[15159.874199] [<00000000e9c80f00>] ext4_bio_write_page+0x1b0/0x528 
[15159.874202] [<000000009bf94bad>] mpage_submit_page+0x60/0x90 
[15159.874205] [<00000000da1a9585>] mpage_map_and_submit_buffers+0x138/0x238 
[15159.874208] [<00000000c84c3e14>] ext4_writepages+0x8dc/0xe08 
[15159.874214] [<000000007a345b10>] do_writepages+0x5c/0x108 
[15159.874217] [<00000000ef1a522d>] __writeback_single_inode+0x48/0x4f8 
[15159.874220] [<00000000aeac1ba5>] writeback_sb_inodes+0x1c0/0x470 
[15159.874223] [<00000000f7f818b4>] __writeback_inodes_wb+0x78/0xc8 
[15159.874225] [<00000000ae30bb56>] wb_writeback+0x24c/0x3d8 
[15159.874228] [<00000000b489a91f>] wb_workfn+0x1c4/0x490 
[15159.874233] [<000000004df896a9>] process_one_work+0x1d8/0x498 
[15159.874236] [<00000000d7fa6dd7>] worker_thread+0x4c/0x478 
[15159.874240] [<00000000f46ec2f2>] kthread+0x138/0x140 
[15159.874243] [<000000009e914ea4>] ret_from_fork+0x10/0x1c

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