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charset="us-ascii" Content-Disposition: inline hi, Jim, this report is just FYI. for parent commit f8241f5267959 drm-dyndbg: DRM_CLASSMAP_USE in drm_crtc_helper we actuall observe seemingly more severe issues, that crash early. ========================================================================================= tbox_group/testcase/rootfs/kconfig/compiler/runtime/group/nr_groups: vm-snb/trinity/yocto-i386-minimal-20190520.cgz/i386-randconfig-015-20251110/clang-20/300s/group-03/5 f8241f526795939e e2a703d65295b8bce9b8a7e4663 ---------------- --------------------------- fail:runs %reproduction fail:runs | | | 6:6 -100% :6 dmesg.BUG:kernel_NULL_pointer_dereference,address 6:6 -100% :6 dmesg.EIP:ddebug_condense_sites 6:6 -100% :6 dmesg.Kernel_panic-not_syncing:Fatal_exception 6:6 -100% :6 dmesg.Oops :6 100% 6:6 dmesg.WARNING:suspicious_RCU_usage :6 100% 6:6 dmesg.lib/maple_tree.c:#suspicious_rcu_dereference_check()usage one dmesg is attached as dmesg-f8241f5267.xz [ 0.405069][ T1] Performance Events: unsupported CPU family 6 model 42 no PMU driver, software events only. [ 0.406705][ T1] signal: max sigframe size: 1760 [ 0.407679][ T1] BUG: kernel NULL pointer dereference, address: 00000004 [ 0.408501][ T1] #PF: supervisor read access in kernel mode [ 0.409175][ T1] #PF: error_code(0x0000) - not-present page [ 0.409860][ T1] *pdpt = 0000000000000000 *pde = f000ff53f000ff53 [ 0.410580][ T1] Oops: Oops: 0000 [#1] PTI [ 0.411093][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.17.0-00058-gf8241f526795 #1 PREEMPTLAZY [ 0.411135][ T1] EIP: ddebug_condense_sites+0x76/0x4c0 [ 0.411135][ T1] Code: 89 d3 89 d7 eb 22 90 90 90 90 90 90 90 90 90 90 90 90 90 90 ff 45 e0 89 fa 83 c7 18 83 c3 18 3b 7d e8 0f 83 83 00 00 00 8b 02 <8b> 70 04 8b 07 3b 70 04 74 e5 8d 4b e8 83 3d f0 3f 94 8c 03 7d 2d [ 0.411135][ T1] EAX: 00000000 EBX: 8c0bcb14 ECX: 811a5c7c EDX: 8c0bcb14 [ 0.411135][ T1] ESI: 8c1e3d04 EDI: 8c0bcb14 EBP: 811a5c28 ESP: 811a5c00 [ 0.411135][ T1] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010287 [ 0.411135][ T1] CR0: 80050033 CR2: 00000004 CR3: 0c1f8000 CR4: 000406b0 [ 0.411135][ T1] Call Trace: [ 0.411135][ T1] ? up_write+0xc6/0x180 [ 0.411135][ T1] dynamic_debug_init+0xaa/0x210 [ 0.411135][ T1] ? _raw_spin_unlock_irqrestore+0x58/0x94 [ 0.411135][ T1] ? add_device_randomness+0x57/0x80 [ 0.411135][ T1] ? trace_preempt_on+0xf/0x50 [ 0.411135][ T1] ? _raw_spin_unlock_irqrestore+0x58/0x94 [ 0.411135][ T1] ? preempt_count_sub+0x7b/0xe0 [ 0.411135][ T1] do_one_initcall+0xb0/0x2c0 [ 0.411135][ T1] ? dyndbg_setup+0x8/0x8 [ 0.411135][ T1] ? kvm_sched_clock_read+0xd/0x1c [ 0.411135][ T1] ? sched_clock_noinstr+0x8/0xc [ 0.411135][ T1] ? local_clock_noinstr+0x38/0x120 [ 0.411135][ T1] ? kvm_sched_clock_read+0xd/0x1c [ 0.411135][ T1] ? sched_clock_noinstr+0x8/0xc [ 0.411135][ T1] ? kvm_sched_clock_read+0xd/0x1c [ 0.411135][ T1] ? local_clock_noinstr+0x38/0x120 [ 0.411135][ T1] ? kvm_sched_clock_read+0xd/0x1c [ 0.411135][ T1] ? sched_clock_noinstr+0x8/0xc [ 0.411135][ T1] ? local_clock_noinstr+0x38/0x120 [ 0.411135][ T1] ? __lock_acquire+0x564/0x2a40 [ 0.411135][ T1] ? kvm_sched_clock_read+0xd/0x1c [ 0.411135][ T1] ? sched_clock_noinstr+0x8/0xc [ 0.411135][ T1] ? local_clock_noinstr+0x38/0x120 [ 0.411135][ T1] ? __this_cpu_preempt_check+0xf/0x17 [ 0.411135][ T1] ? _raw_spin_unlock+0x27/0x40 [ 0.411135][ T1] ? __register_sysctl_table+0x5bc/0x600 [ 0.411135][ T1] ? trace_preempt_on+0xf/0x50 [ 0.411135][ T1] ? _raw_spin_unlock+0x27/0x40 [ 0.411135][ T1] ? preempt_count_sub+0x7b/0xe0 [ 0.411135][ T1] ? _raw_spin_unlock+0x27/0x40 [ 0.411135][ T1] ? __register_sysctl_table+0x5bc/0x600 [ 0.411135][ T1] ? rest_init+0xfc/0xfc [ 0.411135][ T1] do_pre_smp_initcalls+0x2a/0x6c [ 0.411135][ T1] ? rest_init+0xfc/0xfc [ 0.411135][ T1] kernel_init_freeable+0x52/0xcc [ 0.411135][ T1] kernel_init+0x17/0x128 [ 0.411135][ T1] ret_from_fork+0x137/0x1e0 [ 0.411135][ T1] ? rest_init+0xfc/0xfc [ 0.411135][ T1] ret_from_fork_asm+0x12/0x18 [ 0.411135][ T1] entry_INT80_32+0x107/0x107 [ 0.411135][ T1] Modules linked in: [ 0.411135][ T1] CR2: 0000000000000004 [ 0.411135][ T1] ---[ end trace 0000000000000000 ]--- [ 0.411135][ T1] EIP: ddebug_condense_sites+0x76/0x4c0 [ 0.411135][ T1] Code: 89 d3 89 d7 eb 22 90 90 90 90 90 90 90 90 90 90 90 90 90 90 ff 45 e0 89 fa 83 c7 18 83 c3 18 3b 7d e8 0f 83 83 00 00 00 8b 02 <8b> 70 04 8b 07 3b 70 04 74 e5 8d 4b e8 83 3d f0 3f 94 8c 03 7d 2d [ 0.411135][ T1] EAX: 00000000 EBX: 8c0bcb14 ECX: 811a5c7c EDX: 8c0bcb14 [ 0.411135][ T1] ESI: 8c1e3d04 EDI: 8c0bcb14 EBP: 811a5c28 ESP: 811a5c00 [ 0.411135][ T1] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010287 [ 0.411135][ T1] CR0: 80050033 CR2: 00000004 CR3: 0c1f8000 CR4: 000406b0 [ 0.411135][ T1] Kernel panic - not syncing: Fatal exception we don't have enough knowledge if e2a703d652 is just the fix of above issue. since now kernel will not crash but show "WARNING:suspicious_RCU_usage" still in very early time, we just make out this report FYI what we observed in our tests. Hello, kernel test robot noticed "WARNING:suspicious_RCU_usage" on: commit: e2a703d65295b8bce9b8a7e4663c409fa25bd194 ("drm-dyndbg: DRM_CLASSMAP_USE in drm_dp_helper") https://github.com/jimc/linux.git dd-drm-fix in testcase: trinity version: with following parameters: runtime: 300s group: group-03 nr_groups: 5 config: i386-randconfig-015-20251110 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) 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 | Closes: https://lore.kernel.org/oe-lkp/202511111514.ecbaaa39-lkp@intel.com [ 0.526141][ T1] WARNING: suspicious RCU usage [ 0.527180][ T1] 6.17.0-00059-ge2a703d65295 #1 Not tainted [ 0.528409][ T1] ----------------------------- [ 0.529086][ T1] lib/maple_tree.c:844 suspicious rcu_dereference_check() usage! [ 0.530839][ T1] [ 0.530839][ T1] other info that might help us debug this: [ 0.530839][ T1] [ 0.533092][ T1] [ 0.533092][ T1] rcu_scheduler_active = 2, debug_locks = 1 [ 0.534816][ T1] no locks held by swapper/0/1. [ 0.535841][ T1] [ 0.535841][ T1] stack backtrace: [ 0.537088][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.17.0-00059-ge2a703d65295 #1 PREEMPTLAZY [ 0.539384][ T1] Call Trace: [ 0.540260][ T1] __dump_stack (lib/dump_stack.c:95) [ 0.541066][ T1] dump_stack_lvl (lib/dump_stack.c:123 (discriminator 3)) [ 0.541066][ T1] dump_stack (lib/dump_stack.c:129) [ 0.541066][ T1] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6877) [ 0.541066][ T1] mas_start (lib/maple_tree.c:?) [ 0.541066][ T1] mas_find (lib/maple_tree.c:284 lib/maple_tree.c:3630 lib/maple_tree.c:4939 lib/maple_tree.c:6018 lib/maple_tree.c:6058) [ 0.541066][ T1] dynamic_debug_init (lib/dynamic_debug.c:1972 (discriminator 1)) [ 0.541066][ T1] ? _raw_spin_unlock_irqrestore (arch/x86/include/asm/preempt.h:104 include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) [ 0.541066][ T1] do_one_initcall (init/main.c:1269) [ 0.541066][ T1] ? dyndbg_setup (lib/dynamic_debug.c:1931) [ 0.541066][ T1] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91) [ 0.541066][ T1] ? sched_clock_noinstr (arch/x86/kernel/tsc.c:271) [ 0.541066][ T1] ? local_clock_noinstr (kernel/sched/clock.c:272 kernel/sched/clock.c:309) [ 0.541066][ T1] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91) [ 0.541066][ T1] ? sched_clock_noinstr (arch/x86/kernel/tsc.c:271) [ 0.541066][ T1] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91) [ 0.541066][ T1] ? local_clock_noinstr (kernel/sched/clock.c:272 kernel/sched/clock.c:309) [ 0.541066][ T1] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91) [ 0.541066][ T1] ? sched_clock_noinstr (arch/x86/kernel/tsc.c:271) [ 0.541066][ T1] ? local_clock_noinstr (kernel/sched/clock.c:272 kernel/sched/clock.c:309) [ 0.541066][ T1] ? __lock_acquire (kernel/locking/lockdep.c:4674) [ 0.541066][ T1] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91) [ 0.541066][ T1] ? sched_clock_noinstr (arch/x86/kernel/tsc.c:271) [ 0.541066][ T1] ? local_clock_noinstr (kernel/sched/clock.c:272 kernel/sched/clock.c:309) [ 0.541066][ T1] ? __this_cpu_preempt_check (lib/smp_processor_id.c:65) [ 0.541066][ T1] ? _raw_spin_unlock (arch/x86/include/asm/preempt.h:104 include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) [ 0.541066][ T1] ? __register_sysctl_table (fs/proc/proc_sysctl.c:1399) [ 0.541066][ T1] ? trace_preempt_on (kernel/trace/trace_preemptirq.c:122) [ 0.541066][ T1] ? _raw_spin_unlock (arch/x86/include/asm/preempt.h:104 include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) [ 0.541066][ T1] ? preempt_count_sub (arch/x86/include/asm/preempt.h:85 (discriminator 1) kernel/sched/core.c:5864 (discriminator 1)) [ 0.541066][ T1] ? _raw_spin_unlock (arch/x86/include/asm/preempt.h:104 include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) [ 0.541066][ T1] ? __register_sysctl_table (fs/proc/proc_sysctl.c:1399) [ 0.541066][ T1] ? rest_init (init/main.c:1461) [ 0.541066][ T1] do_pre_smp_initcalls (init/main.c:1374 (discriminator 2)) [ 0.541066][ T1] ? rest_init (init/main.c:1461) [ 0.541066][ T1] kernel_init_freeable (init/main.c:1569) [ 0.541066][ T1] kernel_init (init/main.c:1471) [ 0.541066][ T1] ret_from_fork (arch/x86/kernel/process.c:154) [ 0.541066][ T1] ? rest_init (init/main.c:1461) [ 0.541066][ T1] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 0.541066][ T1] entry_INT80_32 (arch/x86/entry/entry_32.S:945) [ 0.541090][ T1] [ 0.541618][ T1] ============================= [ 0.542722][ T1] WARNING: suspicious RCU usage [ 0.543814][ T1] 6.17.0-00059-ge2a703d65295 #1 Not tainted [ 0.545085][ T1] ----------------------------- [ 0.546167][ T1] lib/maple_tree.c:800 suspicious rcu_dereference_check() usage! [ 0.547824][ T1] [ 0.547824][ T1] other info that might help us debug this: [ 0.547824][ T1] [ 0.549088][ T1] [ 0.549088][ T1] rcu_scheduler_active = 2, debug_locks = 1 [ 0.550905][ T1] no locks held by swapper/0/1. [ 0.553083][ T1] [ 0.553083][ T1] stack backtrace: [ 0.554374][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.17.0-00059-ge2a703d65295 #1 PREEMPTLAZY [ 0.556518][ T1] Call Trace: [ 0.557066][ T1] __dump_stack (lib/dump_stack.c:95) [ 0.557066][ T1] dump_stack_lvl (lib/dump_stack.c:123 (discriminator 3)) [ 0.557066][ T1] dump_stack (lib/dump_stack.c:129) [ 0.557066][ T1] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6877) [ 0.557066][ T1] mtree_range_walk (lib/maple_tree.c:?) [ 0.557066][ T1] mas_find (lib/maple_tree.c:279 lib/maple_tree.c:4940 lib/maple_tree.c:6018 lib/maple_tree.c:6058) [ 0.557066][ T1] dynamic_debug_init (lib/dynamic_debug.c:1972 (discriminator 1)) [ 0.557066][ T1] ? _raw_spin_unlock_irqrestore (arch/x86/include/asm/preempt.h:104 include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) [ 0.557066][ T1] do_one_initcall (init/main.c:1269) [ 0.557066][ T1] ? dyndbg_setup (lib/dynamic_debug.c:1931) [ 0.557066][ T1] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91) [ 0.557066][ T1] ? sched_clock_noinstr (arch/x86/kernel/tsc.c:271) [ 0.557066][ T1] ? local_clock_noinstr (kernel/sched/clock.c:272 kernel/sched/clock.c:309) [ 0.557066][ T1] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91) [ 0.557066][ T1] ? sched_clock_noinstr (arch/x86/kernel/tsc.c:271) [ 0.557066][ T1] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91) [ 0.557066][ T1] ? local_clock_noinstr (kernel/sched/clock.c:272 kernel/sched/clock.c:309) [ 0.557066][ T1] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91) [ 0.557066][ T1] ? sched_clock_noinstr (arch/x86/kernel/tsc.c:271) [ 0.557066][ T1] ? local_clock_noinstr (kernel/sched/clock.c:272 kernel/sched/clock.c:309) [ 0.557066][ T1] ? __lock_acquire (kernel/locking/lockdep.c:4674) [ 0.557066][ T1] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91) [ 0.557066][ T1] ? sched_clock_noinstr (arch/x86/kernel/tsc.c:271) [ 0.557066][ T1] ? local_clock_noinstr (kernel/sched/clock.c:272 kernel/sched/clock.c:309) [ 0.557066][ T1] ? __this_cpu_preempt_check (lib/smp_processor_id.c:65) [ 0.557066][ T1] ? _raw_spin_unlock (arch/x86/include/asm/preempt.h:104 include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) [ 0.557066][ T1] ? __register_sysctl_table (fs/proc/proc_sysctl.c:1399) [ 0.557066][ T1] ? trace_preempt_on (kernel/trace/trace_preemptirq.c:122) [ 0.557066][ T1] ? _raw_spin_unlock (arch/x86/include/asm/preempt.h:104 include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) [ 0.557066][ T1] ? preempt_count_sub (arch/x86/include/asm/preempt.h:85 (discriminator 1) kernel/sched/core.c:5864 (discriminator 1)) [ 0.557066][ T1] ? _raw_spin_unlock (arch/x86/include/asm/preempt.h:104 include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) [ 0.557066][ T1] ? __register_sysctl_table (fs/proc/proc_sysctl.c:1399) [ 0.557066][ T1] ? rest_init (init/main.c:1461) [ 0.557066][ T1] do_pre_smp_initcalls (init/main.c:1374 (discriminator 2)) [ 0.557066][ T1] ? rest_init (init/main.c:1461) [ 0.557066][ T1] kernel_init_freeable (init/main.c:1569) [ 0.557066][ T1] kernel_init (init/main.c:1471) [ 0.557066][ T1] ret_from_fork (arch/x86/kernel/process.c:154) [ 0.557066][ T1] ? rest_init (init/main.c:1461) [ 0.557066][ T1] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 0.557066][ T1] entry_INT80_32 (arch/x86/entry/entry_32.S:945) The kernel config and materials to reproduce are available at: 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