linux-kernel - Re: BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:65

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Date:   Wed, 13 Feb 2019 15:21:32 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Pintu Agarwal <pintu.ping@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-rt-users@...r.kernel.org, linux-mm@...ck.org,
        Jorge Ramirez <jorge.ramirez-ortiz@...aro.org>,
        "Xenomai@...omai.org" <xenomai@...omai.org>
Subject: Re: BUG: sleeping function called from invalid context at
 kernel/locking/rwsem.c:65

Hi Pintu,

On 2/13/2019 2:04 PM, Pintu Agarwal wrote:
> 
> This is the complete logs at the time of crash:
> 
> [   21.681020] VFS: Mounted root (ext4 filesystem) readonly on device 8:6.
> [   21.690441] devtmpfs: mounted
> [   21.702517] Freeing unused kernel memory: 6528K
> [   21.766665] BUG: sleeping function called from invalid context at
> kernel/locking/rwsem.c:65
> [   21.775108] in_atomic(): 0, irqs_disabled(): 128, pid: 1, name: init
> [   21.781532] ------------[ cut here ]------------
> [   21.786209] kernel BUG at kernel/sched/core.c:8490!
> [   21.791157] ------------[ cut here ]------------
> [   21.795831] kernel BUG at kernel/sched/core.c:8490!
> [   21.800763] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
> [   21.806319] Modules linked in:
> [   21.809474] CPU: 0 PID: 1 Comm: init Not tainted 4.9.103+ #115
> [   21.815375] Hardware name: Qualcomm Technologies, Inc. MSM XXXX
> [   21.822584] task: ffffffe330440080 task.stack: ffffffe330448000
> [   21.828584] PC is at ___might_sleep+0x140/0x188
> [   21.833175] LR is at ___might_sleep+0x128/0x188
> [   21.837759] pc : [<ffffff88b8ce65a8>] lr : [<ffffff88b8ce6590>]
> pstate: 604001c5

<snip...>

> 0000000000000000 ffffffe33044b8d0
> [   22.135279] bac0: 0000000000000462 0000000000000006
> [   22.140224] [<ffffff88b8ce65a8>] ___might_sleep+0x140/0x188
> [   22.145862] [<ffffff88b8ce6648>] __might_sleep+0x58/0x90
> [   22.151249] [<ffffff88b9d43f84>] down_write_killable+0x2c/0x80
> [   22.157155] [<ffffff88b8e53cd8>] setup_arg_pages+0xb8/0x208
> [   22.162792] [<ffffff88b8eb7534>] load_elf_binary+0x434/0x1298
> [   22.168600] [<ffffff88b8e55674>] search_binary_handler+0xac/0x1f0
> [   22.174763] [<ffffff88b8e560ec>] do_execveat_common.isra.15+0x504/0x6c8
> [   22.181452] [<ffffff88b8e562f4>] do_execve+0x44/0x58
> [   22.186481] [<ffffff88b8c84030>] run_init_process+0x38/0x48
> [   22.192122] [<ffffff88b9d3db1c>] kernel_init+0x8c/0x108
> [   22.197411] [<ffffff88b8c83f00>] ret_from_fork+0x10/0x50
> [   22.202790] Code: b9453800 0b000020 6b00027f 540000c1 (d4210000)
> [   22.208965] ---[ end trace d775a851176a61ec ]---
> [   22.220051] Kernel panic - not syncing: Attempted to kill init!
> exitcode=0x0000000b
> 

This might be the work of CONFIG_PANIC_ON_SCHED_BUG which is extra debug 
option enabled in *sdm845_defconfig*. You can disable it or better
I would suggest to use *sdm845-perf_defconfig* instead of
sdm845_defconfig since there are a lot of debug options enabled
in the latter which may be not compatible when IPIPE patches
are applied.

Thanks,
Sai

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