My fairly ordinary x86 test box gets stuck during reboot on the
wait_for_completion() in ide_do_drive_cmd():
(gdb) thread 73
[Switching to thread 73 (Thread 2906)]#0 ide_do_drive_cmd (drive=0xc072dd10, rq=0x0,
action=ide_wait) at drivers/ide/ide-io.c:1671
1671 rq->waiting = NULL;
(gdb) bt
#0 ide_do_drive_cmd (drive=0xc072dd10, rq=0x0, action=ide_wait) at drivers/ide/ide-io.c:1671
#1 0xc02e64c0 in ide_diag_taskfile (drive=0xc072dd10, args=0xcc0c1e20, data_size=0, buf=0x0)
at drivers/ide/ide-taskfile.c:503
#2 0xc02e64e6 in ide_raw_taskfile (drive=0x0, args=0x0, buf=0x0) at drivers/ide/ide-taskfile.c:508
#3 0xc02eab6d in do_idedisk_flushcache (drive=0x0) at drivers/ide/ide-disk.c:831
#4 0xc02eb232 in ide_cacheflush_p (drive=0xc072dd10) at drivers/ide/ide-disk.c:1027
#5 0xc02eb2e4 in ide_device_shutdown (dev=0xc072ddf4) at drivers/ide/ide-disk.c:1083
#6 0xc02af75c in device_shutdown () at drivers/base/power/shutdown.c:45
#7 0xc0128bfe in kernel_restart (cmd=0x0) at kernel/sys.c:375
#8 0xc0128dea in sys_reboot (magic1=-18751827, magic2=672274793, cmd=19088743, arg=0x0)
at kernel/sys.c:484
#9 0xc0102ba3 in sysenter_past_esp () at arch/i386/kernel/semaphore.c:177
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