() returns 0
due to debug_locks being changed from 1 to 0 by __debug_locks_off() from
debug_locks_off() from debug_locks_off_graph_unlock(), lock-classes value in
/proc/lockdep_stats will not decrease after "BUG: MAX_LOCKDEP_KEYS too low!"
is printed.
On 23/01/2021 21:29, Tetsuo Handa wrote:
On 2021/01/23 15:35, Alexey Kardashevskiy wrote:
this behaves quite different but still produces the message (i have
show_workqueue_state() right after the bug message):
[ 85.803991] BUG: MAX_LOCKDEP_KEYS too low!
[ 85.804338] turning off the
On 2021/01/23 15:35, Alexey Kardashevskiy wrote:
> this behaves quite different but still produces the message (i have
> show_workqueue_state() right after the bug message):
>
>
> [ 85.803991] BUG: MAX_LOCKDEP_KEYS too low!
> [ 85.804338] turning off the locking cor
cking/lockdep.c
@@ -1277,6 +1277,7 @@ register_lock_class(struct lockdep_map *lock, unsigned
int subclass, int force)
print_lockdep_off("BUG: MAX_LOCKDEP_KEYS too low!");
dump_stack();
+ show_workqueue_state();
force)
print_lockdep_off("BUG: MAX_LOCKDEP_KEYS too low!");
dump_stack();
+ show_workqueue_state();
return NULL;
}
nr_lock_classes++;
Here is the result:
https://pastebin.com/rPn0Cytu
Do you mi
On Fri, Jan 22, 2021 at 4:43 AM Alexey Kardashevskiy wrote:
>
> Hi!
>
> Syzkaller found this bug and it has a repro (below). I googled a similar
> bug in 2019 which was fixed so this seems new.
>
> The repro takes about a half a minute to produce the message, "grep
> lock-classes /proc/lockdep_st
Hi!
Syzkaller found this bug and it has a repro (below). I googled a similar
bug in 2019 which was fixed so this seems new.
The repro takes about a half a minute to produce the message, "grep
lock-classes /proc/lockdep_stats" reports 8177 of 8192, before running
the repro it is 702. It is a
#syz fix: net: partially revert dynamic lockdep key changes
> BUG: MAX_LOCKDEP_KEYS too low!
> turning off the locking correctness validator.
> CPU: 0 PID: 15175 Comm: syz-executor.5 Not tainted 5.4.0-rc3+ #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01
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