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linux/include
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Tetsuo Handa b88f55389a profiling: remove profile=sleep support 
The kernel sleep profile is no longer working due to a recursive locking
bug introduced by commit 42a20f86dc ("sched: Add wrapper for get_wchan()
to keep task blocked")

Booting with the 'profile=sleep' kernel command line option added or
executing

  # echo -n sleep > /sys/kernel/profiling

after boot causes the system to lock up.

Lockdep reports

  kthreadd/3 is trying to acquire lock:
  ffff93ac82e08d58 (&p->pi_lock){....}-{2:2}, at: get_wchan+0x32/0x70

  but task is already holding lock:
  ffff93ac82e08d58 (&p->pi_lock){....}-{2:2}, at: try_to_wake_up+0x53/0x370

with the call trace being

   lock_acquire+0xc8/0x2f0
   get_wchan+0x32/0x70
   __update_stats_enqueue_sleeper+0x151/0x430
   enqueue_entity+0x4b0/0x520
   enqueue_task_fair+0x92/0x6b0
   ttwu_do_activate+0x73/0x140
   try_to_wake_up+0x213/0x370
   swake_up_locked+0x20/0x50
   complete+0x2f/0x40
   kthread+0xfb/0x180

However, since nobody noticed this regression for more than two years,
let's remove 'profile=sleep' support based on the assumption that nobody
needs this functionality.

Fixes: 42a20f86dc ("sched: Add wrapper for get_wchan() to keep task blocked")
Cc: stable@vger.kernel.org # v5.16+
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2024-08-04 13:36:28 -07:00
..
acpi Driver core changes for 6.11-rc1 2024-07-25 10:42:22 -07:00
asm-generic runtime constants: deal with old decrepit linkers 2024-08-03 08:38:45 -07:00
clocksource
crypto
drm
dt-bindings I3C for 6.11 2024-07-27 10:53:06 -07:00
keys
kunit kunit: Introduce KUNIT_ASSERT_MEMEQ and KUNIT_ASSERT_MEMNEQ macros 2024-07-12 10:12:11 -06:00
kvm
linux profiling: remove profile=sleep support 2024-08-04 13:36:28 -07:00
math-emu
media
memory
misc
net sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
pcmcia
ras mm/memory-failure: remove obsolete MF_MSG_DIFFERENT_COMPOUND 2024-07-12 15:52:22 -07:00
rdma
rv
scsi Driver core changes for 6.11-rc1 2024-07-25 10:42:22 -07:00
soc sound updates for 6.11-rc1 2024-07-19 12:39:34 -07:00
sound sound fixes for 6.11-rc2 2024-08-02 09:04:57 -07:00
target
trace Including fixes from wireless, bleutooth, BPF and netfilter. 2024-08-01 09:42:09 -07:00
uapi uretprobe: change syscall number, again 2024-08-02 15:18:49 +02:00
ufs scsi: ufs: core: Check LSDBS cap when !mcq 2024-07-15 22:51:06 -04:00
vdso Random number generator updates for Linux 6.11-rc1. 2024-07-24 10:29:50 -07:00
video
xen Driver core changes for 6.11-rc1 2024-07-25 10:42:22 -07:00