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Tue, 10 Mar 2026 00:17:02 -0700 (PDT) Date: Tue, 10 Mar 2026 00:17:02 -0700 In-Reply-To: <20260310064845.3659772-1-wangqing7171@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69afc56e.a00a0220.d013.0003.GAE@google.com> Subject: Re: [syzbot] [kernel?] KMSAN: uninit-value in __flush_smp_call_function_queue From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, wangqing7171@gmail.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KMSAN: uninit-value in __flush_smp_call_function_queue ===================================================== BUG: KMSAN: uninit-value in __flush_smp_call_function_queue+0x362/0x18e0 kernel/smp.c:535 __flush_smp_call_function_queue+0x362/0x18e0 kernel/smp.c:535 generic_smp_call_function_single_interrupt+0x1c/0x30 kernel/smp.c:463 __sysvec_call_function_single+0x4b/0x3e0 arch/x86/kernel/smp.c:271 instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline] sysvec_call_function_single+0x7c/0x90 arch/x86/kernel/smp.c:266 asm_sysvec_call_function_single+0x1f/0x30 arch/x86/include/asm/idtentry.h:704 native_irq_enable arch/x86/include/asm/irqflags.h:42 [inline] arch_local_irq_enable arch/x86/include/asm/irqflags.h:119 [inline] raw_spin_rq_unlock_irq kernel/sched/sched.h:1629 [inline] finish_lock_switch kernel/sched/core.c:5032 [inline] finish_task_switch+0x11b/0x8b0 kernel/sched/core.c:5150 context_switch kernel/sched/core.c:5298 [inline] __schedule+0x2607/0x8640 kernel/sched/core.c:6908 preempt_schedule_common+0x33/0x80 kernel/sched/core.c:7092 preempt_schedule+0x30/0x40 kernel/sched/core.c:7116 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] _raw_spin_unlock_irqrestore+0x57/0x60 kernel/locking/spinlock.c:194 unlock_hrtimer_base kernel/time/hrtimer.c:1021 [inline] hrtimer_try_to_cancel+0x8b0/0xae0 kernel/time/hrtimer.c:1368 hrtimer_cancel+0x33/0xf0 kernel/time/hrtimer.c:1489 schedule_hrtimeout_range_clock+0x16d/0x2f0 kernel/time/sleep_timeout.c:218 schedule_hrtimeout_range+0x42/0x50 kernel/time/sleep_timeout.c:263 poll_schedule_timeout fs/select.c:241 [inline] do_select+0x282b/0x2aa0 fs/select.c:603 core_sys_select+0xa5a/0x10e0 fs/select.c:677 do_pselect fs/select.c:759 [inline] __do_sys_pselect6 fs/select.c:798 [inline] __se_sys_pselect6+0x554/0x6b0 fs/select.c:789 __x64_sys_pselect6+0x114/0x1a0 fs/select.c:789 x64_sys_call+0xa5d/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:271 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable mmap_event created at: perf_event_mmap+0x47/0x2fe0 kernel/events/core.c:9894 __mmap_complete mm/vma.c:2585 [inline] __mmap_region mm/vma.c:2768 [inline] mmap_region+0x4a79/0x6220 mm/vma.c:2837 CPU: 1 UID: 0 PID: 6279 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ===================================================== Tested on: commit: 1f318b96 Linux 7.0-rc3 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14d4694a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=242f02fcd3fbc8f3 dashboard link: https://syzkaller.appspot.com/bug?extid=4b1bd55fba6260160779 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=1227175a580000