Hi, * Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx> [210521 12:57]: > Well... I guess there's no bug as such. The simple-pm-bus just uses a lot > more stack. Looking at the reports from CONFIG_STACK_TRACER, in the good > commit the biggest stack is in USB probing with depth of 4896. With > 01d7136894410a71932096e0fb9f1d301b6ccf07, and a debug print in > omap_i2c_xfer_common, I can get to 7544. > > I don't know what to do about this, so I'm giving up for the time being and > "fix" it for myself by increasing THREAD_SIZE_ORDER. > > # cat /sys/kernel/debug/tracing/stack_trace > Depth Size Location (143 entries) > ----- ---- -------- > 0) 7544 28 ftrace_graph_call+0x0/0xc > 1) 7516 28 rcu_read_lock_sched_held+0x38/0x88 > 2) 7488 120 lock_acquire+0x1ac/0x560 > 3) 7368 16 _raw_spin_lock_irqsave+0x64/0x80 > 4) 7352 56 timekeeping_advance+0x3c/0x934 > 5) 7296 144 update_wall_time+0x1c/0x20 > 6) 7152 16 tick_do_update_jiffies64+0x1f0/0x304 > 7) 7136 104 tick_sched_timer+0xf0/0x10c > 8) 7032 96 __hrtimer_run_queues+0x2d8/0x68c > 9) 6936 112 hrtimer_interrupt+0x158/0x388 > 10) 6824 16 dmtimer_clockevent_interrupt+0x34/0x3c > 11) 6808 64 __handle_irq_event_percpu+0x108/0x384 > 12) 6744 40 handle_irq_event+0x68/0xe0 > 13) 6704 32 handle_fasteoi_irq+0xbc/0x224 > 14) 6672 40 __handle_domain_irq+0x98/0x10c > 15) 6632 48 gic_handle_irq+0x9c/0xc4 > 16) 6584 68 __irq_svc+0x70/0x98 > 17) 6516 60 console_unlock+0x444/0x688 > 18) 6456 196 vprintk_emit+0x138/0x344 > 19) 6260 68 vprintk_default+0x34/0x3c > 20) 6192 48 vprintk_func+0xec/0x194 > 21) 6144 24 printk+0x3c/0x64 > 22) 6120 104 omap_i2c_xfer_common+0x698/0x6e4 > 23) 6016 16 omap_i2c_xfer_irq+0x1c/0x20 > 24) 6000 80 __i2c_transfer+0x184/0xa80 > 25) 5920 40 i2c_transfer+0xa8/0x144 > 26) 5880 64 regmap_i2c_read+0x6c/0xa8 > 27) 5816 72 _regmap_raw_read+0x138/0x474 > 28) 5744 40 _regmap_bus_read+0x54/0x80 > 29) 5704 56 _regmap_read+0x74/0x248 > 30) 5648 32 regmap_read+0x4c/0x70 > 31) 5616 32 regulator_get_voltage_sel_regmap+0x40/0x94 > 32) 5584 32 regulator_attr_is_visible+0x18c/0x278 > 33) 5552 88 internal_create_group+0xe4/0x3e0 > 34) 5464 40 internal_create_groups.part.0+0x54/0x98 > 35) 5424 16 sysfs_create_groups+0x24/0x30 > 36) 5408 96 device_add+0x280/0x944 > 37) 5312 104 regulator_register+0x694/0xc4c > 38) 5208 32 devm_regulator_register+0x48/0x84 > 39) 5176 72 palmas_smps_registration+0x1b4/0x480 > 40) 5104 136 palmas_regulators_probe+0x348/0x450 > 41) 4968 32 platform_probe+0x68/0xc8 > 42) 4936 64 really_probe+0x114/0x588 > 43) 4872 48 driver_probe_device+0x88/0x1f0 > 44) 4824 32 __device_attach_driver+0xac/0x118 > 45) 4792 48 bus_for_each_drv+0x90/0xe0 > 46) 4744 48 __device_attach+0xe0/0x1ec > 47) 4696 16 device_initial_probe+0x1c/0x20 > 48) 4680 32 bus_probe_device+0x98/0xa0 > 49) 4648 96 device_add+0x37c/0x944 > 50) 4552 16 of_device_add+0x44/0x4c > 51) 4536 40 of_platform_device_create_pdata+0xa0/0xcc > 52) 4496 112 of_platform_bus_create+0x1bc/0x34c > 53) 4384 48 of_platform_populate+0x90/0x124 > 54) 4336 32 devm_of_platform_populate+0x4c/0x90 > 55) 4304 88 palmas_i2c_probe+0x478/0x608 > 56) 4216 40 i2c_device_probe+0x2a0/0x2f8 > 57) 4176 64 really_probe+0x114/0x588 > 58) 4112 48 driver_probe_device+0x88/0x1f0 > 59) 4064 32 __device_attach_driver+0xac/0x118 > 60) 4032 48 bus_for_each_drv+0x90/0xe0 > 61) 3984 48 __device_attach+0xe0/0x1ec > 62) 3936 16 device_initial_probe+0x1c/0x20 > 63) 3920 32 bus_probe_device+0x98/0xa0 > 64) 3888 96 device_add+0x37c/0x944 > 65) 3792 24 device_register+0x24/0x28 > 66) 3768 48 i2c_new_client_device+0x140/0x264 > 67) 3720 112 of_i2c_register_devices+0xdc/0x188 > 68) 3608 64 i2c_register_adapter+0x220/0x700 > 69) 3544 32 __i2c_add_numbered_adapter+0x60/0xac > 70) 3512 32 i2c_add_adapter+0xa0/0xe4 > 71) 3480 16 i2c_add_numbered_adapter+0x2c/0x30 > 72) 3464 80 omap_i2c_probe+0x404/0x6b8 > 73) 3384 32 platform_probe+0x68/0xc8 > 74) 3352 64 really_probe+0x114/0x588 > 75) 3288 48 driver_probe_device+0x88/0x1f0 > 76) 3240 32 __device_attach_driver+0xac/0x118 > 77) 3208 48 bus_for_each_drv+0x90/0xe0 > 78) 3160 48 __device_attach+0xe0/0x1ec > 79) 3112 16 device_initial_probe+0x1c/0x20 > 80) 3096 32 bus_probe_device+0x98/0xa0 > 81) 3064 96 device_add+0x37c/0x944 > 82) 2968 16 of_device_add+0x44/0x4c > 83) 2952 40 of_platform_device_create_pdata+0xa0/0xcc > 84) 2912 112 of_platform_bus_create+0x1bc/0x34c > 85) 2800 48 of_platform_populate+0x90/0x124 > 86) 2752 104 sysc_probe+0x10e4/0x1628 > 87) 2648 32 platform_probe+0x68/0xc8 > 88) 2616 64 really_probe+0x114/0x588 > 89) 2552 48 driver_probe_device+0x88/0x1f0 > 90) 2504 32 __device_attach_driver+0xac/0x118 > 91) 2472 48 bus_for_each_drv+0x90/0xe0 > 92) 2424 48 __device_attach+0xe0/0x1ec > 93) 2376 16 device_initial_probe+0x1c/0x20 > 94) 2360 32 bus_probe_device+0x98/0xa0 > 95) 2328 96 device_add+0x37c/0x944 > 96) 2232 16 of_device_add+0x44/0x4c > 97) 2216 40 of_platform_device_create_pdata+0xa0/0xcc > 98) 2176 112 of_platform_bus_create+0x1bc/0x34c > 99) 2064 48 of_platform_populate+0x90/0x124 > 100) 2016 32 simple_pm_bus_probe+0x54/0x80 > 101) 1984 32 platform_probe+0x68/0xc8 > 102) 1952 64 really_probe+0x114/0x588 > 103) 1888 48 driver_probe_device+0x88/0x1f0 > 104) 1840 32 __device_attach_driver+0xac/0x118 > 105) 1808 48 bus_for_each_drv+0x90/0xe0 > 106) 1760 48 __device_attach+0xe0/0x1ec > 107) 1712 16 device_initial_probe+0x1c/0x20 > 108) 1696 32 bus_probe_device+0x98/0xa0 > 109) 1664 96 device_add+0x37c/0x944 > 110) 1568 16 of_device_add+0x44/0x4c > 111) 1552 40 of_platform_device_create_pdata+0xa0/0xcc > 112) 1512 112 of_platform_bus_create+0x1bc/0x34c > 113) 1400 48 of_platform_populate+0x90/0x124 > 114) 1352 32 simple_pm_bus_probe+0x54/0x80 > 115) 1320 32 platform_probe+0x68/0xc8 > 116) 1288 64 really_probe+0x114/0x588 > 117) 1224 48 driver_probe_device+0x88/0x1f0 > 118) 1176 32 __device_attach_driver+0xac/0x118 > 119) 1144 48 bus_for_each_drv+0x90/0xe0 > 120) 1096 48 __device_attach+0xe0/0x1ec > 121) 1048 16 device_initial_probe+0x1c/0x20 > 122) 1032 32 bus_probe_device+0x98/0xa0 > 123) 1000 96 device_add+0x37c/0x944 > 124) 904 16 of_device_add+0x44/0x4c > 125) 888 40 of_platform_device_create_pdata+0xa0/0xcc > 126) 848 112 of_platform_bus_create+0x1bc/0x34c > 127) 736 48 of_platform_populate+0x90/0x124 > 128) 688 32 simple_pm_bus_probe+0x54/0x80 > 129) 656 32 platform_probe+0x68/0xc8 > 130) 624 64 really_probe+0x114/0x588 > 131) 560 48 driver_probe_device+0x88/0x1f0 > 132) 512 32 __device_attach_driver+0xac/0x118 > 133) 480 48 bus_for_each_drv+0x90/0xe0 > 134) 432 48 __device_attach+0xe0/0x1ec > 135) 384 16 device_initial_probe+0x1c/0x20 > 136) 368 32 bus_probe_device+0x98/0xa0 > 137) 336 48 deferred_probe_work_func+0xac/0xfc > 138) 288 104 process_one_work+0x270/0x7c4 > 139) 184 48 worker_thread+0x1ec/0x524 > 140) 136 48 kthread+0x160/0x178 > 141) 88 8 ret_from_fork+0x14/0x38 > 142) 80 80 0x0 Heh that's a pretty crazy stack there :) Tony
