# busybox lsmod
Module                  Size  Used by    Not tainted
# busybox echo -n "mem" > /sys/power/state && timestamp
[ 1555.949217] PM: Preparing system for mem sleep
[ 1555.998401] Freezing cpus ...
[ 1556.016506] Stopping tasks: =======|
[ 1556.231402] platform i8042: suspend
[ 1556.231443] serial8250 serial8250: suspend
[ 1556.231550] vesafb vesafb.0: suspend
[ 1556.231578] platform pcspkr: suspend
[ 1556.231603] pnp 00:04: suspend
[ 1556.231628] pnp 00:03: suspend
[ 1556.231651] pnp 00:02: suspend
[ 1556.231674] pnp 00:01: suspend
[ 1556.231698] pnp 00:00: suspend
[ 1556.231724] pci 0000:00:0f.5: suspend
[ 1556.232674] pci 0000:00:0f.4: suspend
[ 1556.233521] pci 0000:00:0f.3: suspend
[ 1556.234167] pci 0000:00:0f.2: suspend
[ 1556.234811] pci 0000:00:0f.0: suspend
[ 1556.235462] pci 0000:00:01.1: suspend
[ 1556.236275] pci 0000:00:01.0: suspend
[ 1556.236933] acpi acpi: suspend
[ 1556.236971] PM: Entering mem sleep
[   24.524549] Back to C!
[   24.525381] BUG: sleeping function called from invalid context at include/asm
/semaphore.h:99
[   24.525420] in_atomic():0, irqs_disabled():1
[   24.527301]  [<c04051ee>] show_trace_log_lvl+0x58/0x159
[   24.527643]  [<c0405802>] show_trace+0xd/0x10
[   24.527951]  [<c040591b>] dump_stack+0x19/0x1b
[   24.528261]  [<c041de7f>] __might_sleep+0x8d/0x95
[   24.529268]  [<c05038ec>] acpi_os_wait_semaphore+0x55/0xb2
[   24.535051]  [<c05197a6>] acpi_ut_acquire_mutex+0x39/0x77
[   24.541258]  [<c0511c45>] acpi_ns_get_node+0x42/0x84
[   24.547303]  [<c0511588>] acpi_ns_evaluate+0x2c/0xf4
[   24.553322]  [<c0515402>] acpi_rs_set_srs_method_data+0xc3/0xde
[   24.559456]  [<c0514d55>] acpi_set_current_resources+0x2e/0x39
[   24.565575]  [<c051cd9f>] acpi_pci_link_set+0xfb/0x1a1
[   24.571900]  [<c051ce90>] irqrouter_resume+0x4b/0x62
[   24.578221]  [<c054bcd6>] __sysdev_resume+0x14/0x57
[   24.585499]  [<c054be4e>] sysdev_resume+0x19/0x4b
[   24.592781]  [<c055049a>] device_power_up+0x8/0xf
[   24.600228]  [<c0443e17>] suspend_enter+0x3f/0x5e
[   24.602129]  [<c0443f93>] enter_state+0x15d/0x1c3
[   24.604029]  [<c044407f>] state_store+0x86/0x9c
[   24.605914]  [<c04a8eb0>] subsys_attr_store+0x20/0x25
[   24.609694]  [<c04a8fb4>] sysfs_write_file+0xab/0xd1
[   24.613498]  [<c0472297>] vfs_write+0xab/0x157
[   24.616288]  [<c04728dc>] sys_write+0x3b/0x60
[   24.619099]  [<c0403faf>] syscall_call+0x7/0xb
[   24.619380] DWARF2 unwinder stuck at syscall_call+0x7/0xb
[   24.619405] Leftover inexact backtrace:
[   24.619428]  [<c0405802>] show_trace+0xd/0x10
[   24.619472]  [<c040591b>] dump_stack+0x19/0x1b
[   24.619514]  [<c041de7f>] __might_sleep+0x8d/0x95
[   24.619558]  [<c05038ec>] acpi_os_wait_semaphore+0x55/0xb2
[   24.619606]  [<c05197a6>] acpi_ut_acquire_mutex+0x39/0x77
[   24.619653]  [<c0511c45>] acpi_ns_get_node+0x42/0x84
[   24.619700]  [<c0511588>] acpi_ns_evaluate+0x2c/0xf4
[   24.619742]  [<c0515402>] acpi_rs_set_srs_method_data+0xc3/0xde
[   24.619794]  [<c0514d55>] acpi_set_current_resources+0x2e/0x39
[   24.619841]  [<c051cd9f>] acpi_pci_link_set+0xfb/0x1a1
[   24.619888]  [<c051ce90>] irqrouter_resume+0x4b/0x62
[   24.619931]  [<c054bcd6>] __sysdev_resume+0x14/0x57
[   24.619982]  [<c054be4e>] sysdev_resume+0x19/0x4b
[   24.620025]  [<c055049a>] device_power_up+0x8/0xf
[   24.620071]  [<c0443e17>] suspend_enter+0x3f/0x5e
[   24.620125]  [<c0443f93>] enter_state+0x15d/0x1c3
[   24.620162]  [<c044407f>] state_store+0x86/0x9c
[   24.620198]  [<c04a8eb0>] subsys_attr_store+0x20/0x25
[   24.620244]  [<c04a8fb4>] sysfs_write_file+0xab/0xd1
[   24.620285]  [<c0472297>] vfs_write+0xab/0x157
[   24.620334]  [<c04728dc>] sys_write+0x3b/0x60
[   24.620375]  [<c0403faf>] syscall_call+0x7/0xb
[   24.646558] PM: Finishing wakeup.
[   24.647785] acpi acpi: resuming
[   24.647828] pci 0000:00:01.0: resuming
[   24.648459] pci 0000:00:01.1: resuming
[   24.649266] pci 0000:00:0f.0: resuming
[   24.649891] pci 0000:00:0f.2: resuming
[   24.650502] pci 0000:00:0f.3: resuming
[   24.651114] pci 0000:00:0f.4: resuming
[   24.651824] pci 0000:00:0f.5: resuming
[   24.652537] pnp 00:00: resuming
[   24.652562] pnp 00:01: resuming
[   24.652585] pnp 00:02: resuming
[   24.652686] pnp 00:03: resuming
[   24.652712] pnp 00:04: resuming
[   24.652735] platform pcspkr: resuming
[   24.652759] vesafb vesafb.0: resuming
[   24.652786] serial8250 serial8250: resuming
[   24.653027] platform i8042: resuming
[   26.914341] Restarting tasks... done
[   26.950518] Thawing cpus ...
04:05:19.735988
#
