Getting this dump (see below) after 243 sec on my STM32MP card running Balena OS 2.58.0 development image. When I’am running in production mode I don’t get this reboot.
The reboot problem is solved by running follow command after boot before 243 sec have past:
echo 0 > /proc/sys/kernel/hung_task_timeout_secs
… but I like to understand whats wrong and not only hide it. Or if I just have to live it, where should I add that command to run automatic on boot?
[ 243.679640] INFO: task kworker/0:2:71 blocked for more than 120 seconds.
[ 243.684885] Tainted: G O 4.19.49 #1
[ 243.690319] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 243.697999] kworker/0:2 D 0 71 2 0x00000000
[ 243.703871] Workqueue: events_freezable mmc_rescan
[ 243.708570] [<c08915b8>] (__schedule) from [<c0891a8c>] (schedule+0x54/0xc0)
[ 243.715791] [<c0891a8c>] (schedule) from [<c0895474>] (schedule_timeout+0x1c8/0x280)
[ 243.723188] [<c0895474>] (schedule_timeout) from [<c0892748>] (wait_for_common+0x144/0x16c)
[ 243.731456] [<c0892748>] (wait_for_common) from [<c063c57c>] (mmc_wait_for_req_done+0x8c/0x108)
[ 243.740115] [<c063c57c>] (mmc_wait_for_req_done) from [<c063cfb8>] (mmc_wait_for_cmd+0x6c/0xa0)
[ 243.748746] [<c063cfb8>] (mmc_wait_for_cmd) from [<c0647e2c>] (mmc_io_rw_direct_host+0x94/0x128)
[ 243.757586] [<c0647e2c>] (mmc_io_rw_direct_host) from [<c06482f4>] (sdio_reset+0x38/0x84)
[ 243.765724] [<c06482f4>] (sdio_reset) from [<c063ec60>] (mmc_rescan+0x3a4/0x3e8)
[ 243.773217] [<c063ec60>] (mmc_rescan) from [<c0133f2c>] (process_one_work+0x1f0/0x400)
[ 243.781271] [<c0133f2c>] (process_one_work) from [<c0134d4c>] (worker_thread+0x44/0x580)
[ 243.789259] [<c0134d4c>] (worker_thread) from [<c0139e78>] (kthread+0x148/0x150)
[ 243.796691] [<c0139e78>] (kthread) from [<c01010e8>] (ret_from_fork+0x14/0x2c)
[ 243.803838] Exception stack(0xd1fddfb0 to 0xd1fddff8)
[ 243.808783] dfa0: 00000000 00000000 00000000 00000000
[ 243.817299] dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 243.825117] dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 243.831882] NMI backtrace for cpu 0
[ 243.835139] CPU: 0 PID: 25 Comm: khungtaskd Tainted: G O 4.19.49 #1
[ 243.842642] Hardware name: STM32 (Device Tree Support)
[ 243.847793] [<c010f45c>] (unwind_backtrace) from [<c010bb7c>] (show_stack+0x10/0x14)
[ 243.855514] [<c010bb7c>] (show_stack) from [<c087cfac>] (dump_stack+0xb4/0xc8)
[ 243.862725] [<c087cfac>] (dump_stack) from [<c0883278>] (nmi_cpu_backtrace+0x90/0xc4)
[ 243.870543] [<c0883278>] (nmi_cpu_backtrace) from [<c0883410>] (nmi_trigger_cpumask_backtrace+0x164/0x1a4)
[ 243.880185] [<c0883410>] (nmi_trigger_cpumask_backtrace) from [<c01b1dfc>] (watchdog+0x2d4/0x3d4)
[ 243.889047] [<c01b1dfc>] (watchdog) from [<c0139e78>] (kthread+0x148/0x150)
[ 243.895994] [<c0139e78>] (kthread) from [<c01010e8>] (ret_from_fork+0x14/0x2c)
[ 243.903195] Exception stack(0xd2203fb0 to 0xd2203ff8)
[ 243.908237] 3fa0: 00000000 00000000 00000000 00000000
[ 243.916406] 3fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 243.924570] 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 243.931496] Sending NMI from CPU 0 to CPUs 1:
[ 243.935911] NMI backtrace for cpu 1
[ 243.935918] CPU: 1 PID: 1246 Comm: balena-engine-c Tainted: G O 4.19.49 #1
[ 243.935922] Hardware name: STM32 (Device Tree Support)
[ 243.935925] PC is at 0x16ab98
[ 243.935927] LR is at 0xad7ac
[ 243.935931] pc : [<0016ab98>] lr : [<000ad7ac>] psr: 80070010
[ 243.935935] sp : 02b6ee90 ip : 000000f1 fp : 02b48009
[ 243.935938] r10: 02801a40 r9 : 028729a4 r8 : 00000008
[ 243.935942] r7 : 00000083 r6 : 00000000 r5 : 0000001f r4 : 00000008
[ 243.935946] r3 : 00000009 r2 : 02c88270 r1 : 02acc1b0 r0 : 02b48009
[ 243.935950] Flags: Nzcv IRQs on FIQs on Mode USER_32 ISA ARM Segment user
[ 243.935954] Control: 10c5387d Table: d0be006a DAC: 00000055
[ 243.935959] CPU: 1 PID: 1246 Comm: balena-engine-c Tainted: G O 4.19.49 #1
[ 243.935963] Hardware name: STM32 (Device Tree Support)
[ 243.935967] [<c010f45c>] (unwind_backtrace) from [<c010bb7c>] (show_stack+0x10/0x14)
[ 243.935971] [<c010bb7c>] (show_stack) from [<c087cfac>] (dump_stack+0xb4/0xc8)
[ 243.935976] [<c087cfac>] (dump_stack) from [<c08832a8>] (nmi_cpu_backtrace+0xc0/0xc4)
[ 243.935980] [<c08832a8>] (nmi_cpu_backtrace) from [<c010e520>] (handle_IPI+0xd8/0x200)
[ 243.935985] [<c010e520>] (handle_IPI) from [<c043d730>] (gic_handle_irq+0x8c/0x90)
[ 243.935989] [<c043d730>] (gic_handle_irq) from [<c0101df0>] (__irq_usr+0x50/0x80)
[ 243.935992] Exception stack(0xd0dcffb0 to 0xd0dcfff8)
[ 243.935997] ffa0: 02b48009 02acc1b0 02c88270 00000009
[ 243.936002] ffc0: 00000008 0000001f 00000000 00000083 00000008 028729a4 02801a40 02b48009
[ 243.936006] ffe0: 000000f1 02b6ee90 000ad7ac 0016ab98 80070010 ffffffff
[ 243.936831] Kernel panic - not syncing: hung_task: blocked tasks
[ 244.093726] CPU: 0 PID: 25 Comm: khungtaskd Tainted: G O 4.19.49 #1
[ 244.101268] Hardware name: STM32 (Device Tree Support)
[ 244.106429] [<c010f45c>] (unwind_backtrace) from [<c010bb7c>] (show_stack+0x10/0x14)
[ 244.114139] [<c010bb7c>] (show_stack) from [<c087cfac>] (dump_stack+0xb4/0xc8)
[ 244.121347] [<c087cfac>] (dump_stack) from [<c011c334>] (panic+0xf4/0x26c)
[ 244.128213] [<c011c334>] (panic) from [<c01b1e08>] (watchdog+0x2e0/0x3d4)
[ 244.134991] [<c01b1e08>] (watchdog) from [<c0139e78>] (kthread+0x148/0x150)
[ 244.141938] [<c0139e78>] (kthread) from [<c01010e8>] (ret_from_fork+0x14/0x2c)
[ 244.149139] Exception stack(0xd2203fb0 to 0xd2203ff8)
[ 244.154181] 3fa0: 00000000 00000000 00000000 00000000
[ 244.162349] 3fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 244.170514] 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 244.177128] CPU1: stopping
[ 244.179813] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G O 4.19.49 #1
[ 244.187188] Hardware name: STM32 (Device Tree Support)
[ 244.192328] [<c010f45c>] (unwind_backtrace) from [<c010bb7c>] (show_stack+0x10/0x14)
[ 244.200054] [<c010bb7c>] (show_stack) from [<c087cfac>] (dump_stack+0xb4/0xc8)
[ 244.207265] [<c087cfac>] (dump_stack) from [<c010e620>] (handle_IPI+0x1d8/0x200)
[ 244.214652] [<c010e620>] (handle_IPI) from [<c043d730>] (gic_handle_irq+0x8c/0x90)
[ 244.222209] [<c043d730>] (gic_handle_irq) from [<c0101a0c>] (__irq_svc+0x6c/0xa8)
[ 244.229671] Exception stack(0xd3085f78 to 0xd3085fc0)
[ 244.234711] 5f60: 00000000 00051f90
[ 244.242884] 5f80: d3af548c c01179e0 ffffe000 c15064b0 c15064f0 00000002 c153e822 c0a96af0
[ 244.251049] 5fa0: 00000000 00000000 c1510740 d3085fc8 c0108b3c c0108b40 60070013 ffffffff
[ 244.259220] [<c0101a0c>] (__irq_svc) from [<c0108b40>] (arch_cpu_idle+0x38/0x3c)
[ 244.266604] [<c0108b40>] (arch_cpu_idle) from [<c0146e80>] (do_idle+0x118/0x158)
[ 244.273986] [<c0146e80>] (do_idle) from [<c0147180>] (cpu_startup_entry+0x18/0x20)
[ 244.281544] [<c0147180>] (cpu_startup_entry) from [<c010242c>] (__enable_mmu+0x0/0x14)
[ 244.289452] Rebooting in 1 seconds..