* [jimc:wk-modhash] [dyndbg] a6e60e2484: WARNING:suspicious_RCU_usage
@ 2026-01-26 13:18 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2026-01-26 13:18 UTC (permalink / raw)
To: Jim Cromie, Łukasz Bartosik; +Cc: oe-lkp, lkp, oliver.sang
Hello,
kernel test robot noticed "WARNING:suspicious_RCU_usage" on:
commit: a6e60e2484beb46405af7aba2a83cea2aaf0815f ("dyndbg: walk dd_mod_map intervals in dynamic_debug_init()")
https://github.com/jimc/linux.git wk-modhash
in testcase: boot
config: x86_64-randconfig-074-20260122
compiler: clang-20
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 32G
(please refer to attached dmesg/kmsg for entire log/backtrace)
+------------------------------------------------------------------------------------+------------+------------+
| | 46e05bf6d2 | a6e60e2484 |
+------------------------------------------------------------------------------------+------------+------------+
| WARNING:suspicious_RCU_usage | 0 | 6 |
| include/linux/rcupdate.h:#Illegal_context_switch_in_RCU_read-side_critical_section | 0 | 6 |
| BUG:sleeping_function_called_from_invalid_context_at_include/linux/sched/mm.h | 0 | 6 |
+------------------------------------------------------------------------------------+------------+------------+
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 <oliver.sang@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202601262015.5f498cb8-lkp@intel.com
[ 0.848842][ T1] WARNING: suspicious RCU usage
[ 0.849347][ T1] 6.19.0-rc6-00039-ga6e60e2484be #1 Not tainted
[ 0.850012][ T1] -----------------------------
[ 0.850522][ T1] include/linux/rcupdate.h:410 Illegal context switch in RCU read-side critical section!
[ 0.851549][ T1]
[ 0.851549][ T1] other info that might help us debug this:
[ 0.851549][ T1]
[ 0.852619][ T1]
[ 0.852619][ T1] rcu_scheduler_active = 2, debug_locks = 1
[ 0.853448][ T1] 1 lock held by swapper/0/1:
[ 0.853945][ T1] #0: ffffffff83bcbfb0 (rcu_read_lock){....}-{1:3}, at: dynamic_debug_init (include/linux/rcupdate.h:331 include/linux/rcupdate.h:867 lib/dynamic_debug.c:1800)
[ 0.855024][ T1]
[ 0.855024][ T1] stack backtrace:
[ 0.855624][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.19.0-rc6-00039-ga6e60e2484be #1 PREEMPTLAZY
[ 0.856708][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 0.857761][ T1] Call Trace:
[ 0.858101][ T1] <TASK>
[ 0.858410][ T1] __dump_stack (lib/dump_stack.c:95)
[ 0.858859][ T1] dump_stack_lvl (lib/dump_stack.c:123)
[ 0.859338][ T1] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6877)
[ 0.859898][ T1] __might_resched (kernel/sched/core.c:8791)
[ 0.860395][ T1] __might_sleep (kernel/sched/core.c:8759)
[ 0.860868][ T1] slab_pre_alloc_hook (mm/slub.c:4906)
[ 0.861392][ T1] slab_alloc_node (mm/slub.c:5239)
[ 0.861886][ T1] ? mas_next_slot (lib/maple_tree.c:4410)
[ 0.862401][ T1] ? dynamic_debug_init (include/linux/rcupdate.h:331 include/linux/rcupdate.h:867 lib/dynamic_debug.c:1800)
[ 0.862934][ T1] ? ddebug_add_module (lib/dynamic_debug.c:1578)
[ 0.863450][ T1] __kmalloc_cache_noprof (mm/slub.c:5771)
[ 0.863987][ T1] ? dynamic_debug_init (include/linux/rcupdate.h:331 include/linux/rcupdate.h:867 lib/dynamic_debug.c:1800)
[ 0.864520][ T1] ddebug_add_module (lib/dynamic_debug.c:1578)
[ 0.865012][ T1] ? dynamic_debug_init (include/linux/rcupdate.h:331 include/linux/rcupdate.h:867 lib/dynamic_debug.c:1800)
[ 0.865012][ T1] dynamic_debug_init (lib/dynamic_debug.c:1811)
[ 0.865012][ T1] ? dyndbg_setup (lib/dynamic_debug.c:1843)
[ 0.865012][ T1] __initstub__kmod_dynamic_debug__1505_1843_dynamic_debug_initearly (lib/dynamic_debug.c:1843)
[ 0.865012][ T1] do_one_initcall (init/main.c:1378)
[ 0.865012][ T1] ? rcu_read_lock_any_held (kernel/rcu/update.c:386)
[ 0.865012][ T1] ? __lock_acquire (kernel/locking/lockdep.c:3801 kernel/locking/lockdep.c:3821 kernel/locking/lockdep.c:3876 kernel/locking/lockdep.c:5237)
[ 0.865012][ T1] ? ___slab_alloc (include/linux/spinlock.h:? mm/slub.c:3550 mm/slub.c:3630 mm/slub.c:4631)
[ 0.865012][ T1] ? _raw_spin_unlock_irqrestore (include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194)
[ 0.865012][ T1] ? ___slab_alloc (include/linux/spinlock.h:? mm/slub.c:3550 mm/slub.c:3630 mm/slub.c:4631)
[ 0.865012][ T1] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91)
[ 0.865012][ T1] ? sched_clock_noinstr (arch/x86/kernel/tsc.c:272)
[ 0.865012][ T1] ? __register_sysctl_table (include/linux/spinlock.h:? fs/proc/proc_sysctl.c:?)
[ 0.865012][ T1] ? local_clock_noinstr (kernel/sched/clock.c:274 kernel/sched/clock.c:309)
[ 0.865012][ T1] ? local_clock (arch/x86/include/asm/preempt.h:95 kernel/sched/clock.c:319)
[ 0.865012][ T1] ? __register_sysctl_table (include/linux/spinlock.h:? fs/proc/proc_sysctl.c:?)
[ 0.865012][ T1] ? _raw_spin_unlock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186)
[ 0.865012][ T1] ? _raw_write_unlock (include/linux/rwlock_api_smp.h:226 kernel/locking/spinlock.c:342)
[ 0.865012][ T1] do_pre_smp_initcalls (init/main.c:1483)
[ 0.865012][ T1] kernel_init_freeable (init/main.c:1678)
[ 0.865012][ T1] ? rest_init (init/main.c:1570)
[ 0.865012][ T1] kernel_init (kernel/async.c:297 kernel/async.c:284 init/main.c:1580)
[ 0.865012][ T1] ret_from_fork (arch/x86/kernel/process.c:164)
[ 0.865012][ T1] ? rest_init (init/main.c:1570)
[ 0.865012][ T1] ret_from_fork_asm (arch/x86/entry/entry_64.S:256)
[ 0.865012][ T1] </TASK>
[ 0.865022][ T1] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:323
[ 0.865708][ T1] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1, name: swapper/0
[ 0.866337][ T1] preempt_count: 1, expected: 0
[ 0.866679][ T1] 1 lock held by swapper/0/1:
[ 0.867004][ T1] #0: ffffffff83bcbfb0 (rcu_read_lock){....}-{1:3}, at: dynamic_debug_init (include/linux/rcupdate.h:331 include/linux/rcupdate.h:867 lib/dynamic_debug.c:1800)
[ 0.867709][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.19.0-rc6-00039-ga6e60e2484be #1 PREEMPTLAZY
[ 0.868476][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 0.869211][ T1] Call Trace:
[ 0.869455][ T1] <TASK>
[ 0.869751][ T1] __dump_stack (lib/dump_stack.c:95)
[ 0.870190][ T1] dump_stack_lvl (lib/dump_stack.c:123)
[ 0.870654][ T1] __might_resched (kernel/sched/core.c:8830)
[ 0.871152][ T1] __might_sleep (kernel/sched/core.c:8759)
[ 0.871671][ T1] slab_pre_alloc_hook (mm/slub.c:4906)
[ 0.872188][ T1] slab_alloc_node (mm/slub.c:5239)
[ 0.872680][ T1] ? mas_next_slot (lib/maple_tree.c:4410)
[ 0.873174][ T1] ? dynamic_debug_init (include/linux/rcupdate.h:331 include/linux/rcupdate.h:867 lib/dynamic_debug.c:1800)
[ 0.873699][ T1] ? ddebug_add_module (lib/dynamic_debug.c:1578)
[ 0.874214][ T1] __kmalloc_cache_noprof (mm/slub.c:5771)
[ 0.874768][ T1] ? dynamic_debug_init (include/linux/rcupdate.h:331 include/linux/rcupdate.h:867 lib/dynamic_debug.c:1800)
[ 0.875012][ T1] ddebug_add_module (lib/dynamic_debug.c:1578)
[ 0.875012][ T1] ? dynamic_debug_init (include/linux/rcupdate.h:331 include/linux/rcupdate.h:867 lib/dynamic_debug.c:1800)
[ 0.875012][ T1] dynamic_debug_init (lib/dynamic_debug.c:1811)
[ 0.875012][ T1] ? dyndbg_setup (lib/dynamic_debug.c:1843)
[ 0.875012][ T1] __initstub__kmod_dynamic_debug__1505_1843_dynamic_debug_initearly (lib/dynamic_debug.c:1843)
[ 0.875012][ T1] do_one_initcall (init/main.c:1378)
[ 0.875012][ T1] ? rcu_read_lock_any_held (kernel/rcu/update.c:386)
[ 0.875012][ T1] ? __lock_acquire (kernel/locking/lockdep.c:3801 kernel/locking/lockdep.c:3821 kernel/locking/lockdep.c:3876 kernel/locking/lockdep.c:5237)
[ 0.875012][ T1] ? ___slab_alloc (include/linux/spinlock.h:? mm/slub.c:3550 mm/slub.c:3630 mm/slub.c:4631)
[ 0.875012][ T1] ? _raw_spin_unlock_irqrestore (include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194)
[ 0.875012][ T1] ? ___slab_alloc (include/linux/spinlock.h:? mm/slub.c:3550 mm/slub.c:3630 mm/slub.c:4631)
[ 0.875012][ T1] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91)
[ 0.875012][ T1] ? sched_clock_noinstr (arch/x86/kernel/tsc.c:272)
[ 0.875012][ T1] ? __register_sysctl_table (include/linux/spinlock.h:? fs/proc/proc_sysctl.c:?)
[ 0.875012][ T1] ? local_clock_noinstr (kernel/sched/clock.c:274 kernel/sched/clock.c:309)
[ 0.875012][ T1] ? local_clock (arch/x86/include/asm/preempt.h:95 kernel/sched/clock.c:319)
[ 0.875012][ T1] ? __register_sysctl_table (include/linux/spinlock.h:? fs/proc/proc_sysctl.c:?)
[ 0.875012][ T1] ? _raw_spin_unlock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186)
[ 0.875012][ T1] ? _raw_write_unlock (include/linux/rwlock_api_smp.h:226 kernel/locking/spinlock.c:342)
[ 0.875012][ T1] do_pre_smp_initcalls (init/main.c:1483)
[ 0.875012][ T1] kernel_init_freeable (init/main.c:1678)
[ 0.875012][ T1] ? rest_init (init/main.c:1570)
[ 0.875012][ T1] kernel_init (kernel/async.c:297 kernel/async.c:284 init/main.c:1580)
[ 0.875012][ T1] ret_from_fork (arch/x86/kernel/process.c:164)
[ 0.875012][ T1] ? rest_init (init/main.c:1570)
[ 0.875012][ T1] ret_from_fork_asm (arch/x86/entry/entry_64.S:256)
[ 0.875012][ T1] </TASK>
[ 0.875048][ T1]
[ 0.875307][ T1] =============================
[ 0.875808][ T1] [ BUG: Invalid wait context ]
[ 0.876315][ T1] 6.19.0-rc6-00039-ga6e60e2484be #1 Tainted: G W
[ 0.877174][ T1] -----------------------------
[ 0.877679][ T1] swapper/0/1 is trying to lock:
[ 0.878204][ T1] ffffffff83ccd418 (ddebug_lock){....}-{4:4}, at: ddebug_add_module (include/linux/list.h:191 lib/dynamic_debug.c:1601)
[ 0.879138][ T1] other info that might help us debug this:
[ 0.879750][ T1] context-{5:5}
[ 0.880110][ T1] 1 lock held by swapper/0/1:
[ 0.880591][ T1] #0: ffffffff83bcbfb0 (rcu_read_lock){....}-{1:3}, at: dynamic_debug_init (include/linux/rcupdate.h:331 include/linux/rcupdate.h:867 lib/dynamic_debug.c:1800)
[ 0.881525][ T1] stack backtrace:
[ 0.881915][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Tainted: G W 6.19.0-rc6-00039-ga6e60e2484be #1 PREEMPTLAZY
[ 0.883184][ T1] Tainted: [W]=WARN
[ 0.883576][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 0.884654][ T1] Call Trace:
[ 0.884990][ T1] <TASK>
[ 0.885012][ T1] __dump_stack (lib/dump_stack.c:95)
[ 0.885012][ T1] dump_stack_lvl (lib/dump_stack.c:123)
[ 0.885012][ T1] __lock_acquire (kernel/locking/lockdep.c:4832 kernel/locking/lockdep.c:4902 kernel/locking/lockdep.c:5187)
[ 0.885012][ T1] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91)
[ 0.885012][ T1] ? ddebug_add_module (include/linux/list.h:191 lib/dynamic_debug.c:1601)
[ 0.885012][ T1] lock_acquire (kernel/locking/lockdep.c:5868)
[ 0.885012][ T1] ? ddebug_add_module (include/linux/list.h:191 lib/dynamic_debug.c:1601)
[ 0.885012][ T1] ? __might_resched (kernel/sched/core.c:8791)
[ 0.885012][ T1] ? ddebug_add_module (include/linux/list.h:191 lib/dynamic_debug.c:1601)
[ 0.885012][ T1] __mutex_lock (kernel/locking/mutex.c:614 kernel/locking/mutex.c:776)
[ 0.885012][ T1] ? ddebug_add_module (include/linux/list.h:191 lib/dynamic_debug.c:1601)
[ 0.885012][ T1] mutex_lock_nested (kernel/locking/mutex.c:829)
[ 0.885012][ T1] ddebug_add_module (include/linux/list.h:191 lib/dynamic_debug.c:1601)
[ 0.885012][ T1] ? dynamic_debug_init (include/linux/rcupdate.h:331 include/linux/rcupdate.h:867 lib/dynamic_debug.c:1800)
[ 0.885012][ T1] dynamic_debug_init (lib/dynamic_debug.c:1811)
[ 0.885012][ T1] ? dyndbg_setup (lib/dynamic_debug.c:1843)
[ 0.885012][ T1] __initstub__kmod_dynamic_debug__1505_1843_dynamic_debug_initearly (lib/dynamic_debug.c:1843)
[ 0.885012][ T1] do_one_initcall (init/main.c:1378)
[ 0.885012][ T1] ? rcu_read_lock_any_held (kernel/rcu/update.c:386)
[ 0.885012][ T1] ? __lock_acquire (kernel/locking/lockdep.c:3801 kernel/locking/lockdep.c:3821 kernel/locking/lockdep.c:3876 kernel/locking/lockdep.c:5237)
[ 0.885012][ T1] ? ___slab_alloc (include/linux/spinlock.h:? mm/slub.c:3550 mm/slub.c:3630 mm/slub.c:4631)
[ 0.885012][ T1] ? _raw_spin_unlock_irqrestore (include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194)
[ 0.885012][ T1] ? ___slab_alloc (include/linux/spinlock.h:? mm/slub.c:3550 mm/slub.c:3630 mm/slub.c:4631)
[ 0.885012][ T1] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91)
[ 0.885012][ T1] ? sched_clock_noinstr (arch/x86/kernel/tsc.c:272)
[ 0.885012][ T1] ? __register_sysctl_table (include/linux/spinlock.h:? fs/proc/proc_sysctl.c:?)
[ 0.885012][ T1] ? local_clock_noinstr (kernel/sched/clock.c:274 kernel/sched/clock.c:309)
[ 0.885012][ T1] ? local_clock (arch/x86/include/asm/preempt.h:95 kernel/sched/clock.c:319)
[ 0.885012][ T1] ? __register_sysctl_table (include/linux/spinlock.h:? fs/proc/proc_sysctl.c:?)
[ 0.885012][ T1] ? _raw_spin_unlock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186)
[ 0.885012][ T1] ? _raw_write_unlock (include/linux/rwlock_api_smp.h:226 kernel/locking/spinlock.c:342)
[ 0.885012][ T1] do_pre_smp_initcalls (init/main.c:1483)
[ 0.885012][ T1] kernel_init_freeable (init/main.c:1678)
[ 0.885012][ T1] ? rest_init (init/main.c:1570)
[ 0.885012][ T1] kernel_init (kernel/async.c:297 kernel/async.c:284 init/main.c:1580)
[ 0.885012][ T1] ret_from_fork (arch/x86/kernel/process.c:164)
[ 0.885012][ T1] ? rest_init (init/main.c:1570)
[ 0.885012][ T1] ret_from_fork_asm (arch/x86/entry/entry_64.S:256)
[ 0.885012][ T1] </TASK>
[ 0.896451][ T1] Memory: 32541600K/33553912K available (24738K kernel code, 10275K rwdata, 11116K rodata, 2024K init, 14052K bss, 991524K reserved, 0K cma-reserved)
[ 0.899956][ T1] devtmpfs: initialized
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260126/202601262015.5f498cb8-lkp@intel.com
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2026-01-26 13:18 UTC | newest]
Thread overview: (only message) (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-01-26 13:18 [jimc:wk-modhash] [dyndbg] a6e60e2484: WARNING:suspicious_RCU_usage kernel test robot
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.