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How to trigger watchdog when kernel panic in i.MX6DL

Question asked by charleo chiu on Nov 28, 2018
Latest reply on Dec 4, 2018 by charleo chiu

I just know that when using BLE connect other device , it will cause kernel panic in i.MX6DL target board. I want to use the watchdog to restart system. How can I enable it and use it?

kernel panic logs as bleow :
[ 144.378068] ------------[ cut here ]------------
[ 144.378099] WARNING: CPU: 1 PID: 1109 at /home/felicia/TG202A_V2/build_dl/tmp/work-shared/imx6dlsabresd/kernel-source/fs/sysfs/dir.c:31 sysfs_warn_dup+0x64/0x74
[ 144.378107] sysfs: cannot create duplicate filename '/devices/soc0/soc/2100000.aips-bus/21f0000.serial/tty/ttymxc3/hci0/hci0:65'
[ 144.378113] Modules linked in: mxc_dcic galcore(O)
[ 144.378141] CPU: 1 PID: 1109 Comm: kworker/u5:1 Tainted: G O 4.9.11-1.0.0+gc27010d99a3d #1
[ 144.378147] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[ 144.378161] Workqueue: hci0 hci_rx_work
[ 144.378201] [<8010eb64>] (unwind_backtrace) from [<8010b180>] (show_stack+0x10/0x14)
[ 144.378219] [<8010b180>] (show_stack) from [<803bf8b4>] (dump_stack+0x78/0x8c)
[ 144.378235] [<803bf8b4>] (dump_stack) from [<8012d390>] (__warn+0xe8/0x100)
[ 144.378248] [<8012d390>] (__warn) from [<8012d3e0>] (warn_slowpath_fmt+0x38/0x48)
[ 144.378261] [<8012d3e0>] (warn_slowpath_fmt) from [<80267e78>] (sysfs_warn_dup+0x64/0x74)
[ 144.378277] [<80267e78>] (sysfs_warn_dup) from [<80267f54>] (sysfs_create_dir_ns+0x84/0x94)
[ 144.378293] [<80267f54>] (sysfs_create_dir_ns) from [<803c20ec>] (kobject_add_internal+0x9c/0x2e4)
[ 144.378306] [<803c20ec>] (kobject_add_internal) from [<803c237c>] (kobject_add+0x48/0x98)
[ 144.378325] [<803c237c>] (kobject_add) from [<804c7d20>] (device_add+0xd4/0x580)
[ 144.378345] [<804c7d20>] (device_add) from [<8094d7fc>] (hci_conn_add_sysfs+0x2c/0x50)
[ 144.378364] [<8094d7fc>] (hci_conn_add_sysfs) from [<8093b0a4>] (hci_le_meta_evt+0xab0/0xd4c)
[ 144.378379] [<8093b0a4>] (hci_le_meta_evt) from [<8093ced8>] (hci_event_packet+0x78c/0x2c20)
[ 144.378391] [<8093ced8>] (hci_event_packet) from [<809300ac>] (hci_rx_work+0x174/0x274)
[ 144.378413] [<809300ac>] (hci_rx_work) from [<801432f0>] (process_one_work+0x1d8/0x3f0)
[ 144.378429] [<801432f0>] (process_one_work) from [<80143ec8>] (worker_thread+0x38/0x558)
[ 144.378445] [<80143ec8>] (worker_thread) from [<80148b68>] (kthread+0xdc/0xf4)
[ 144.378461] [<80148b68>] (kthread) from [<801076f8>] (ret_from_fork+0x14/0x3c)
[ 144.378469] ---[ end trace f337781249c2934c ]---
[ 144.378478] ------------[ cut here ]------------
[ 144.378492] WARNING: CPU: 1 PID: 1109 at /home/felicia/TG202A_V2/build_dl/tmp/work-shared/imx6dlsabresd/kernel-source/lib/kobject.c:240 kobject_add_internal+0x278/0x2e4
[ 144.378500] kobject_add_internal failed for hci0:65 with -EEXIST, don't try to register things with the same name in the same directory.
[ 144.378504] Modules linked in: mxc_dcic galcore(O)
[ 144.378527] CPU: 1 PID: 1109 Comm: kworker/u5:1 Tainted: G W O 4.9.11-1.0.0+gc27010d99a3d #1
[ 144.378533] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[ 144.378542] Workqueue: hci0 hci_rx_work
[ 144.378566] [<8010eb64>] (unwind_backtrace) from [<8010b180>] (show_stack+0x10/0x14)
[ 144.378581] [<8010b180>] (show_stack) from [<803bf8b4>] (dump_stack+0x78/0x8c)
[ 144.378593] [<803bf8b4>] (dump_stack) from [<8012d390>] (__warn+0xe8/0x100)
[ 144.378604] [<8012d390>] (__warn) from [<8012d3e0>] (warn_slowpath_fmt+0x38/0x48)
[ 144.378618] [<8012d3e0>] (warn_slowpath_fmt) from [<803c22c8>] (kobject_add_internal+0x278/0x2e4)
[ 144.378630] [<803c22c8>] (kobject_add_internal) from [<803c237c>] (kobject_add+0x48/0x98)
[ 144.378644] [<803c237c>] (kobject_add) from [<804c7d20>] (device_add+0xd4/0x580)
[ 144.378659] [<804c7d20>] (device_add) from [<8094d7fc>] (hci_conn_add_sysfs+0x2c/0x50)
[ 144.378673] [<8094d7fc>] (hci_conn_add_sysfs) from [<8093b0a4>] (hci_le_meta_evt+0xab0/0xd4c)
[ 144.378686] [<8093b0a4>] (hci_le_meta_evt) from [<8093ced8>] (hci_event_packet+0x78c/0x2c20)
[ 144.378698] [<8093ced8>] (hci_event_packet) from [<809300ac>] (hci_rx_work+0x174/0x274)
[ 144.378714] [<809300ac>] (hci_rx_work) from [<801432f0>] (process_one_work+0x1d8/0x3f0)
[ 144.378728] [<801432f0>] (process_one_work) from [<80143ec8>] (worker_thread+0x38/0x558)
[ 144.378742] [<80143ec8>] (worker_thread) from [<80148b68>] (kthread+0xdc/0xf4)
[ 144.378756] [<80148b68>] (kthread) from [<801076f8>] (ret_from_fork+0x14/0x3c)
[ 144.378764] ---[ end trace f337781249c2934d ]---
[ 144.378775] Bluetooth: Failed to register connection device

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