Created attachment 217037 [details] RPi4 r363886 dmesg output On a recent -CURRENT (r363886) I get the following LOR for the LED mtx which is followed by a few "non-sleepable locks held" on uma_zalloc_debug. A full dmesg is attached. gpioled0: <GPIO LEDs> on ofwbus0 lock order reversal: (sleepable after non-sleepable) 1st 0xffff000000b28258 LED mtx (LED mtx) @ /tank/nfs_public/tiny/src/sys/dev/led/led.c:298 2nd 0xfffffd0001204410 Raspberry Pi firmware gpio (Raspberry Pi firmware gpio) @ /tank/nfs_public/tiny/src/sys/arm/broadcom/bcm2835/raspberrypi_gpio.c:252 stack backtrace: #0 0xffff000000492838 at witness_debugger+0x64 #1 0xffff000000431c20 at _sx_xlock+0x7c #2 0xffff000000702c64 at rpi_fw_gpio_pin_set+0xe8 #3 0xffff0000001d3fc4 at led_create_state+0x154 #4 0xffff0000001a5810 at gpioled_attach+0x290 #5 0xffff00000045fda8 at device_attach+0x400 #6 0xffff00000045f910 at device_probe_and_attach+0x7c #7 0xffff000000461af4 at bus_generic_new_pass+0xf8 #8 0xffff000000461aa4 at bus_generic_new_pass+0xa8 #9 0xffff000000461aa4 at bus_generic_new_pass+0xa8 #10 0xffff00000045cee4 at bus_set_pass+0x4c #11 0xffff0000003bac88 at mi_startup+0x12c uma_zalloc_debug: zone "64" with the following non-sleepable locks held: exclusive sleep mutex LED mtx (LED mtx) r = 0 (0xffff000000b28258) locked @ /tank/nfs_public/tiny/src/sys/dev/led/led.c:298 stack backtrace: #0 0xffff000000492838 at witness_debugger+0x64 #1 0xffff000000493848 at witness_warn+0x3f0 #2 0xffff000000699564 at uma_zalloc_debug+0x2c #3 0xffff000000698fcc at uma_zalloc_arg+0x2c #4 0xffff0000003fefcc at malloc+0x9c #5 0xffff0000006f7df4 at bcm2835_firmware_property+0x44 #6 0xffff000000702c7c at rpi_fw_gpio_pin_set+0x100 #7 0xffff0000001d3fc4 at led_create_state+0x154 #8 0xffff0000001a5810 at gpioled_attach+0x290 #9 0xffff00000045fda8 at device_attach+0x400 #10 0xffff00000045f910 at device_probe_and_attach+0x7c #11 0xffff000000461af4 at bus_generic_new_pass+0xf8 #12 0xffff000000461aa4 at bus_generic_new_pass+0xa8 #13 0xffff000000461aa4 at bus_generic_new_pass+0xa8 #14 0xffff00000045cee4 at bus_set_pass+0x4c #15 0xffff0000003bac88 at mi_startup+0x12c uma_zalloc_debug: zone "16" with the following non-sleepable locks held: exclusive sleep mutex LED mtx (LED mtx) r = 0 (0xffff000000b28258) locked @ /tank/nfs_public/tiny/src/sys/dev/led/led.c:298 stack backtrace: #0 0xffff000000492838 at witness_debugger+0x64 #1 0xffff000000493848 at witness_warn+0x3f0 #2 0xffff000000699564 at uma_zalloc_debug+0x2c #3 0xffff000000698fcc at uma_zalloc_arg+0x2c #4 0xffff0000003fefcc at malloc+0x9c #5 0xffff00000070fad8 at bounce_bus_dmamem_alloc+0x4c #6 0xffff0000006fa948 at bcm2835_mbox_property+0xdc #7 0xffff0000006f7e28 at bcm2835_firmware_property+0x78 #8 0xffff000000702c7c at rpi_fw_gpio_pin_set+0x100 #9 0xffff0000001d3fc4 at led_create_state+0x154 #10 0xffff0000001a5810 at gpioled_attach+0x290 #11 0xffff00000045fda8 at device_attach+0x400 #12 0xffff00000045f910 at device_probe_and_attach+0x7c #13 0xffff000000461af4 at bus_generic_new_pass+0xf8 #14 0xffff000000461aa4 at bus_generic_new_pass+0xa8 #15 0xffff000000461aa4 at bus_generic_new_pass+0xa8 #16 0xffff00000045cee4 at bus_set_pass+0x4c #17 0xffff0000003bac88 at mi_startup+0x12c uma_zalloc_debug: zone "128" with the following non-sleepable locks held: exclusive sleep mutex LED mtx (LED mtx) r = 0 (0xffff000000b28258) locked @ /tank/nfs_public/tiny/src/sys/dev/led/led.c:298 stack backtrace: #0 0xffff000000492838 at witness_debugger+0x64 #1 0xffff000000493848 at witness_warn+0x3f0 #2 0xffff000000699564 at uma_zalloc_debug+0x2c #3 0xffff000000698fcc at uma_zalloc_arg+0x2c #4 0xffff0000003fefcc at malloc+0x9c #5 0xffff00000070fb18 at bounce_bus_dmamem_alloc+0x8c #6 0xffff0000006fa948 at bcm2835_mbox_property+0xdc #7 0xffff0000006f7e28 at bcm2835_firmware_property+0x78 #8 0xffff000000702c7c at rpi_fw_gpio_pin_set+0x100 #9 0xffff0000001d3fc4 at led_create_state+0x154 #10 0xffff0000001a5810 at gpioled_attach+0x290 #11 0xffff00000045fda8 at device_attach+0x400 #12 0xffff00000045f910 at device_probe_and_attach+0x7c #13 0xffff000000461af4 at bus_generic_new_pass+0xf8 #14 0xffff000000461aa4 at bus_generic_new_pass+0xa8 #15 0xffff000000461aa4 at bus_generic_new_pass+0xa8 #16 0xffff00000045cee4 at bus_set_pass+0x4c #17 0xffff0000003bac88 at mi_startup+0x12c uma_zalloc_debug: zone "32" with the following non-sleepable locks held: exclusive sleep mutex LED mtx (LED mtx) r = 0 (0xffff000000b28258) locked @ /tank/nfs_public/tiny/src/sys/dev/led/led.c:298 stack backtrace: #0 0xffff000000492838 at witness_debugger+0x64 #1 0xffff000000493848 at witness_warn+0x3f0 #2 0xffff000000699564 at uma_zalloc_debug+0x2c #3 0xffff000000698fcc at uma_zalloc_arg+0x2c #4 0xffff0000003fefcc at malloc+0x9c #5 0xffff00000070fb7c at bounce_bus_dmamem_alloc+0xf0 #6 0xffff0000006fa948 at bcm2835_mbox_property+0xdc #7 0xffff0000006f7e28 at bcm2835_firmware_property+0x78 #8 0xffff000000702c7c at rpi_fw_gpio_pin_set+0x100 #9 0xffff0000001d3fc4 at led_create_state+0x154 #10 0xffff0000001a5810 at gpioled_attach+0x290 #11 0xffff00000045fda8 at device_attach+0x400 #12 0xffff00000045f910 at device_probe_and_attach+0x7c #13 0xffff000000461af4 at bus_generic_new_pass+0xf8 #14 0xffff000000461aa4 at bus_generic_new_pass+0xa8 #15 0xffff000000461aa4 at bus_generic_new_pass+0xa8 #16 0xffff00000045cee4 at bus_set_pass+0x4c #17 0xffff0000003bac88 at mi_startup+0x12c