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HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 2P1lXOnnZdph+Ed8bWZCqJLi/IKj5/wogB1KkRf5ob9HmQY4HRcviB5s/EUFViqtBrIVjvxuL1fg6TJr3WW6Jw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR11MB7064 X-OriginatorOrg: intel.com Hello, kernel test robot noticed "BUG:KASAN:slab-use-after-free_in__task_pid_nr_ns" on: commit: 99c9e5f1d1d521da2d6b2e8db124138a5a62d01c ("[PATCH] perf/core: Fix missing read event generation on task exit") url: https://github.com/intel-lab-lkp/linux/commits/thaumy-love-gmail-com/perf-core-Fix-missing-read-event-generation-on-task-exit/20250720-080504 base: https://git.kernel.org/cgit/linux/kernel/git/perf/perf-tools-next.git perf-tools-next patch link: https://lore.kernel.org/all/20250720000424.12572-1-thaumy.love@gmail.com/ patch subject: [PATCH] perf/core: Fix missing read event generation on task exit in testcase: trinity version: trinity-i386-abe9de86-1_20230429 with following parameters: runtime: 600s config: x86_64-randconfig-074-20250720 compiler: gcc-12 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G (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/202507230728.5545017c-lkp@intel.com [ 85.439456][ T728] BUG: KASAN: slab-use-after-free in __task_pid_nr_ns (kernel/pid.c:517) [ 85.440144][ T728] Read of size 8 at addr ffff88815975d4a8 by task trinity-c3/728 [ 85.440807][ T728] [ 85.441073][ T728] CPU: 0 UID: 65534 PID: 728 Comm: trinity-c3 Not tainted 6.16.0-rc3-00126-g99c9e5f1d1d5 #1 PREEMPT(full) 7cb1e1aeab1a1bce2ffdef82ac08cc822ee9d55c [ 85.442261][ T728] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 85.443112][ T728] Call Trace: [ 85.443436][ T728] [ 85.443736][ T728] dump_stack_lvl (arch/x86/include/asm/irqflags.h:26 arch/x86/include/asm/irqflags.h:109 arch/x86/include/asm/irqflags.h:151 lib/dump_stack.c:123) [ 85.444146][ T728] print_address_description+0x6b/0x32b [ 85.444687][ T728] ? __task_pid_nr_ns (kernel/pid.c:517) [ 85.445118][ T728] print_report (mm/kasan/report.c:522) [ 85.445522][ T728] ? __virt_addr_valid (arch/x86/mm/physaddr.c:65) [ 85.445964][ T728] ? virt_to_slab (mm/slab.h:214) [ 85.446365][ T728] ? kmem_cache_debug_flags (mm/slab.h:527) [ 85.446828][ T728] ? kasan_complete_mode_report_info (mm/kasan/report_generic.c:179) [ 85.447339][ T728] ? __task_pid_nr_ns (kernel/pid.c:517) [ 85.447777][ T728] kasan_report (mm/kasan/report.c:636) [ 85.448175][ T728] ? __task_pid_nr_ns (kernel/pid.c:517) [ 85.448610][ T728] __asan_report_load8_noabort (mm/kasan/report_generic.c:381) [ 85.449088][ T728] __task_pid_nr_ns (kernel/pid.c:517) [ 85.449513][ T728] perf_event_pid_type (kernel/events/core.c:1433) [ 85.449954][ T728] perf_event_pid (kernel/events/core.c:1441) [ 85.450359][ T728] perf_event_read_event (kernel/events/core.c:8520) [ 85.450825][ T728] ? perf_event_switch_output (kernel/events/core.c:8510) [ 85.451307][ T728] ? __lock_acquire (kernel/locking/lockdep.c:5240) [ 85.451736][ T728] ? __kasan_check_write (mm/kasan/shadow.c:38) [ 85.452189][ T728] ? lock_acquire (kernel/locking/lockdep.c:5836) [ 85.452644][ T728] ? perf_remove_from_context (kernel/events/core.c:2558 (discriminator 9)) [ 85.453124][ T728] ? perf_event__header_size (kernel/events/core.c:2003) [ 85.453597][ T728] ? perf_group_detach (kernel/events/core.c:2316) [ 85.454042][ T728] __perf_remove_from_context (kernel/events/core.c:13965 kernel/events/core.c:2339 kernel/events/core.c:2510) [ 85.454531][ T728] perf_remove_from_context (kernel/events/core.c:2561) [ 85.455008][ T728] perf_event_exit_event+0xa5/0xe0 [ 85.455530][ T728] perf_event_exit_task_context (kernel/events/core.c:14068 (discriminator 3)) [ 85.456027][ T728] ? perf_event_exit_event+0xe0/0xe0 [ 85.456551][ T728] ? kfree (include/trace/events/kmem.h:94 mm/slub.c:4829) [ 85.456921][ T728] ? yama_ptracer_del (security/yama/yama_lsm.c:197) [ 85.457364][ T728] perf_event_free_task (kernel/events/core.c:14170) [ 85.457794][ T728] copy_process (kernel/fork.c:2468) [ 85.458212][ T728] ? pidfd_prepare (kernel/fork.c:1918) [ 85.458672][ T728] ? __lock_acquire (kernel/locking/lockdep.c:5240) [ 85.459110][ T728] ? rcu_lock_acquire (include/linux/rcupdate.h:331) [ 85.459610][ T728] ? lock_acquire (kernel/locking/lockdep.c:5836) [ 85.460062][ T728] kernel_clone (include/linux/random.h:26 kernel/fork.c:2600) [ 85.460468][ T728] ? find_held_lock (kernel/locking/lockdep.c:5353) [ 85.460993][ T728] ? create_io_thread (kernel/fork.c:2559) [ 85.461731][ T728] ? rcu_read_unlock (include/linux/rcupdate.h:874 (discriminator 9)) [ 85.462465][ T728] ? __task_pid_nr_ns (kernel/pid.c:521 (discriminator 11)) [ 85.463254][ T728] __do_compat_sys_ia32_clone (arch/x86/kernel/sys_ia32.c:243) [ 85.464101][ T728] ? __ia32_compat_sys_ia32_mmap (arch/x86/kernel/sys_ia32.c:243) [ 85.464977][ T728] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4660) [ 85.465914][ T728] ? rcu_lock_acquire (include/linux/rcupdate.h:331) [ 85.466774][ T728] ? lock_acquire (kernel/locking/lockdep.c:5836) [ 85.467537][ T728] ? rcu_lock_acquire (include/linux/rcupdate.h:331) [ 85.468369][ T728] __ia32_compat_sys_ia32_clone (arch/x86/kernel/sys_ia32.c:240) [ 85.469175][ T728] ia32_sys_call (kbuild/obj/consumer/x86_64-randconfig-074-20250720/./arch/x86/include/generated/asm/syscalls_32.h:121) [ 85.469884][ T728] __do_fast_syscall_32 (arch/x86/entry/syscall_32.c:83 arch/x86/entry/syscall_32.c:306) [ 85.470731][ T728] ? rcu_read_unlock (include/linux/rcupdate.h:874 (discriminator 9)) [ 85.471470][ T728] ? __task_pid_nr_ns (kernel/pid.c:521 (discriminator 11)) [ 85.472232][ T728] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4660) [ 85.473171][ T728] ? __do_fast_syscall_32 (arch/x86/entry/syscall_32.c:310) [ 85.473958][ T728] ? irqentry_exit_to_user_mode (kernel/entry/common.c:187) [ 85.474835][ T728] do_fast_syscall_32 (arch/x86/entry/syscall_32.c:331) [ 85.475578][ T728] do_SYSENTER_32 (arch/x86/entry/syscall_32.c:370) [ 85.476272][ T728] entry_SYSENTER_compat_after_hwframe (arch/x86/entry/entry_64_compat.S:127) [ 85.477152][ T728] RIP: 0023:0xf7f79579 [ 85.477809][ T728] Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 All code ======== 0: b8 01 10 06 03 mov $0x3061001,%eax 5: 74 b4 je 0xffffffffffffffbb 7: 01 10 add %edx,(%rax) 9: 07 (bad) a: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi e: 10 08 adc %cl,(%rax) 10: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi ... 20: 00 51 52 add %dl,0x52(%rcx) 23: 55 push %rbp 24:* 89 e5 mov %esp,%ebp <-- trapping instruction 26: 0f 34 sysenter 28: cd 80 int $0x80 2a: 5d pop %rbp 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 ret 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 39: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi Code starting with the faulting instruction =========================================== 0: 5d pop %rbp 1: 5a pop %rdx 2: 59 pop %rcx 3: c3 ret 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi f: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi [ 85.480340][ T728] RSP: 002b:00000000ffea1d40 EFLAGS: 00000286 ORIG_RAX: 0000000000000078 [ 85.481557][ T728] RAX: ffffffffffffffda RBX: 0000000001200011 RCX: 0000000000000000 [ 85.482749][ T728] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000f7f722e8 [ 85.483938][ T728] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 85.485110][ T728] R10: 0000000000000000 R11: 0000000000000216 R12: 0000000000000000 [ 85.486283][ T728] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 85.487473][ T728] [ 85.488026][ T728] [ 85.488469][ T728] Allocated by task 728: [ 85.489121][ T728] stack_trace_save (kernel/stacktrace.c:114) [ 85.489831][ T728] kasan_save_stack (mm/kasan/common.c:48) [ 85.490544][ T728] kasan_save_track (arch/x86/include/asm/current.h:25 mm/kasan/common.c:60 mm/kasan/common.c:69) [ 85.491286][ T728] kasan_save_alloc_info (mm/kasan/generic.c:563) [ 85.492023][ T728] unpoison_slab_object (mm/kasan/common.c:320) [ 85.492760][ T728] __kasan_slab_alloc (mm/kasan/common.c:348) [ 85.493476][ T728] kmem_cache_alloc_noprof (mm/slub.c:4148 mm/slub.c:4197 mm/slub.c:4204) [ 85.494245][ T728] copy_signal (kernel/fork.c:1648) [ 85.494942][ T728] copy_process (kernel/fork.c:2166) [ 85.495646][ T728] kernel_clone (include/linux/random.h:26 kernel/fork.c:2600) [ 85.496351][ T728] __do_compat_sys_ia32_clone (arch/x86/kernel/sys_ia32.c:243) [ 85.497150][ T728] __ia32_compat_sys_ia32_clone (arch/x86/kernel/sys_ia32.c:240) [ 85.498002][ T728] ia32_sys_call (kbuild/obj/consumer/x86_64-randconfig-074-20250720/./arch/x86/include/generated/asm/syscalls_32.h:121) [ 85.498765][ T728] __do_fast_syscall_32 (arch/x86/entry/syscall_32.c:83 arch/x86/entry/syscall_32.c:306) [ 85.499552][ T728] do_fast_syscall_32 (arch/x86/entry/syscall_32.c:331) [ 85.500296][ T728] do_SYSENTER_32 (arch/x86/entry/syscall_32.c:370) [ 85.501017][ T728] entry_SYSENTER_compat_after_hwframe (arch/x86/entry/entry_64_compat.S:127) [ 85.501945][ T728] [ 85.502416][ T728] Freed by task 728: [ 85.503050][ T728] stack_trace_save (kernel/stacktrace.c:114) [ 85.503775][ T728] kasan_save_stack (mm/kasan/common.c:48) [ 85.504510][ T728] kasan_save_track (arch/x86/include/asm/current.h:25 mm/kasan/common.c:60 mm/kasan/common.c:69) [ 85.505228][ T728] kasan_save_free_info (mm/kasan/generic.c:579) [ 85.505987][ T728] poison_slab_object (mm/kasan/common.c:248) [ 85.506704][ T728] __kasan_slab_free (mm/kasan/common.c:271) [ 85.507142][ T728] kmem_cache_free (mm/slub.c:4643 mm/slub.c:4745) [ 85.507569][ T728] free_signal_struct (kernel/fork.c:721) [ 85.508010][ T728] copy_process (kernel/fork.c:2454) [ 85.508431][ T728] kernel_clone (include/linux/random.h:26 kernel/fork.c:2600) [ 85.508840][ T728] __do_compat_sys_ia32_clone (arch/x86/kernel/sys_ia32.c:243) [ 85.509323][ T728] __ia32_compat_sys_ia32_clone (arch/x86/kernel/sys_ia32.c:240) [ 85.509808][ T728] ia32_sys_call (kbuild/obj/consumer/x86_64-randconfig-074-20250720/./arch/x86/include/generated/asm/syscalls_32.h:121) [ 85.510227][ T728] __do_fast_syscall_32 (arch/x86/entry/syscall_32.c:83 arch/x86/entry/syscall_32.c:306) [ 85.510689][ T728] do_fast_syscall_32 (arch/x86/entry/syscall_32.c:331) [ 85.511124][ T728] do_SYSENTER_32 (arch/x86/entry/syscall_32.c:370) [ 85.511530][ T728] entry_SYSENTER_compat_after_hwframe (arch/x86/entry/entry_64_compat.S:127) [ 85.512055][ T728] The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250723/202507230728.5545017c-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki