[jimc:dd-ratelimit-2 73/76] lib/dynamic_debug.c:136 ddebug_arena_free() warn: sleeping in atomic context

[jimc:dd-ratelimit-2 73/76] lib/dynamic_debug.c:136 ddebug_arena_free() warn: sleeping in atomic context

[kernel test robot]

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
TO: Jim Cromie <jim.cromie@gmail.com>
TO: "Łukasz Bartosik" <ukaszb@chromium.org>

tree:   https://github.com/jimc/linux.git dd-ratelimit-2
head:   31212444bcca4d1547711ec572b5a398d74640ca
commit: 29d01faf08d63c34e46af173536be5af2aaab4fb [73/76] lib/dynamic_debug: Refactor ddebug_arena to vmalloc backing
:::::: branch date: 34 hours ago
:::::: commit date: 34 hours ago
config: i386-randconfig-141 (https://download.01.org/0day-ci/archive/20260819/202608192133.1ujPLawx-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
smatch: v0.5.0-9187-g5189e3fb

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202608192133.1ujPLawx-lkp@intel.com/

smatch warnings:
lib/dynamic_debug.c:136 ddebug_arena_free() warn: sleeping in atomic context

vim +136 lib/dynamic_debug.c

b80df25b9600208 Jim Cromie 2026-07-15  124  
b80df25b9600208 Jim Cromie 2026-07-15  125  static void ddebug_arena_free(struct ddebug_arena *arena)
b80df25b9600208 Jim Cromie 2026-07-15  126  {
29d01faf08d63c3 Jim Cromie 2026-08-11  127  	struct ddebug_arena_chunk *chunk, *tmp;
b80df25b9600208 Jim Cromie 2026-07-15  128  	unsigned long flags;
b80df25b9600208 Jim Cromie 2026-07-15  129  	static DEFINE_SPINLOCK(arena_lock);
b80df25b9600208 Jim Cromie 2026-07-15  130  
b80df25b9600208 Jim Cromie 2026-07-15  131  	spin_lock_irqsave(&arena_lock, flags);
b80df25b9600208 Jim Cromie 2026-07-15  132  	arena->free_ptr = NULL;
b80df25b9600208 Jim Cromie 2026-07-15  133  	arena->remaining = 0;
29d01faf08d63c3 Jim Cromie 2026-08-11  134  	list_for_each_entry_safe(chunk, tmp, &arena->chunks, link) {
29d01faf08d63c3 Jim Cromie 2026-08-11  135  		list_del(&chunk->link);
29d01faf08d63c3 Jim Cromie 2026-08-11 @136  		vfree(chunk);
b80df25b9600208 Jim Cromie 2026-07-15  137  	}
b80df25b9600208 Jim Cromie 2026-07-15  138  	spin_unlock_irqrestore(&arena_lock, flags);
b80df25b9600208 Jim Cromie 2026-07-15  139  }
b80df25b9600208 Jim Cromie 2026-07-15  140  

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

[jimc:dd-ratelimit-2 73/76] lib/dynamic_debug.c:136 ddebug_arena_free() warn: sleeping in atomic context

[Dan Carpenter]

tree:   https://github.com/jimc/linux.git dd-ratelimit-2
head:   31212444bcca4d1547711ec572b5a398d74640ca
commit: 29d01faf08d63c34e46af173536be5af2aaab4fb [73/76] lib/dynamic_debug: Refactor ddebug_arena to vmalloc backing
config: i386-randconfig-141 (https://download.01.org/0day-ci/archive/20260819/202608192133.1ujPLawx-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
smatch: v0.5.0-9187-g5189e3fb

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202608192133.1ujPLawx-lkp@intel.com/

smatch warnings:
lib/dynamic_debug.c:136 ddebug_arena_free() warn: sleeping in atomic context

vim +136 lib/dynamic_debug.c

b80df25b9600208 Jim Cromie 2026-07-15  125  static void ddebug_arena_free(struct ddebug_arena *arena)
b80df25b9600208 Jim Cromie 2026-07-15  126  {
29d01faf08d63c3 Jim Cromie 2026-08-11  127  	struct ddebug_arena_chunk *chunk, *tmp;
b80df25b9600208 Jim Cromie 2026-07-15  128  	unsigned long flags;
b80df25b9600208 Jim Cromie 2026-07-15  129  	static DEFINE_SPINLOCK(arena_lock);
b80df25b9600208 Jim Cromie 2026-07-15  130  
b80df25b9600208 Jim Cromie 2026-07-15  131  	spin_lock_irqsave(&arena_lock, flags);
b80df25b9600208 Jim Cromie 2026-07-15  132  	arena->free_ptr = NULL;
b80df25b9600208 Jim Cromie 2026-07-15  133  	arena->remaining = 0;
29d01faf08d63c3 Jim Cromie 2026-08-11  134  	list_for_each_entry_safe(chunk, tmp, &arena->chunks, link) {
29d01faf08d63c3 Jim Cromie 2026-08-11  135  		list_del(&chunk->link);
29d01faf08d63c3 Jim Cromie 2026-08-11 @136  		vfree(chunk);

vfree() is a sleeping function so you can't call it while holding
a spinlock.  If you call it from interrupt context, though it doesn't
sleep.  A bit weird like that.

b80df25b9600208 Jim Cromie 2026-07-15  137  	}
b80df25b9600208 Jim Cromie 2026-07-15  138  	spin_unlock_irqrestore(&arena_lock, flags);
b80df25b9600208 Jim Cromie 2026-07-15  139  }

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki