Re: [PATCH] scsi: target: fix deadlock by recursive locking

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On Mon, 18 Sep 2023 15:58:48 -0700, Junxiao Bi wrote:

> The following call trace shown a deadlock issue due to recursive locking
> of mutex "device_mutex" , first lock acquire in target_for_each_device()
> and second in target_free_device().
> 
>  PID: 148266   TASK: ffff8be21ffb5d00  CPU: 10   COMMAND: "iscsi_ttx"
>   #0 [ffffa2bfc9ec3b18] __schedule at ffffffffa8060e7f
>   #1 [ffffa2bfc9ec3ba0] schedule at ffffffffa8061224
>   #2 [ffffa2bfc9ec3bb8] schedule_preempt_disabled at ffffffffa80615ee
>   #3 [ffffa2bfc9ec3bc8] __mutex_lock at ffffffffa8062fd7
>   #4 [ffffa2bfc9ec3c40] __mutex_lock_slowpath at ffffffffa80631d3
>   #5 [ffffa2bfc9ec3c50] mutex_lock at ffffffffa806320c
>   #6 [ffffa2bfc9ec3c68] target_free_device at ffffffffc0935998 [target_core_mod]
>   #7 [ffffa2bfc9ec3c90] target_core_dev_release at ffffffffc092f975 [target_core_mod]
>   #8 [ffffa2bfc9ec3ca0] config_item_put at ffffffffa79d250f
>   #9 [ffffa2bfc9ec3cd0] config_item_put at ffffffffa79d2583
>  #10 [ffffa2bfc9ec3ce0] target_devices_idr_iter at ffffffffc0933f3a [target_core_mod]
>  #11 [ffffa2bfc9ec3d00] idr_for_each at ffffffffa803f6fc
>  #12 [ffffa2bfc9ec3d60] target_for_each_device at ffffffffc0935670 [target_core_mod]
>  #13 [ffffa2bfc9ec3d98] transport_deregister_session at ffffffffc0946408 [target_core_mod]
>  #14 [ffffa2bfc9ec3dc8] iscsit_close_session at ffffffffc09a44a6 [iscsi_target_mod]
>  #15 [ffffa2bfc9ec3df0] iscsit_close_connection at ffffffffc09a4a88 [iscsi_target_mod]
>  #16 [ffffa2bfc9ec3df8] finish_task_switch at ffffffffa76e5d07
>  #17 [ffffa2bfc9ec3e78] iscsit_take_action_for_connection_exit at ffffffffc0991c23 [iscsi_target_mod]
>  #18 [ffffa2bfc9ec3ea0] iscsi_target_tx_thread at ffffffffc09a403b [iscsi_target_mod]
>  #19 [ffffa2bfc9ec3f08] kthread at ffffffffa76d8080
>  #20 [ffffa2bfc9ec3f50] ret_from_fork at ffffffffa8200364
> 
> [...]

Applied to 6.6/scsi-fixes, thanks!

[1/1] scsi: target: fix deadlock by recursive locking
      https://git.kernel.org/mkp/scsi/c/a154f5f643c6

-- 
Martin K. Petersen	Oracle Linux Engineering



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