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In-Reply-To: <20260501022749.010441@splitlinedeMacBook-Pro.local> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69f3a41e.050a0220.22f9df.001b.GAE@google.com> Subject: Re: [syzbot] [kvmarm] BUG: scheduling while atomic in __synchronize_srcu From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tbsthitw@gmail.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: BUG: scheduling while atomic in __synchronize_srcu BUG: scheduling while atomic: syz.2.18/4067/0x00000002 Modules linked in: CPU: 1 UID: 0 PID: 4067 Comm: syz.2.18 Not tainted syzkaller #0 PREEMPT Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace arch/arm64/kernel/stacktrace.c:498 [inline] (C) show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x60/0x80 lib/dump_stack.c:120 dump_stack+0x18/0x24 lib/dump_stack.c:129 __schedule_bug+0x54/0x78 kernel/sched/core.c:5936 schedule_debug kernel/sched/core.c:5963 [inline] __schedule+0x89c/0xddc kernel/sched/core.c:7038 __schedule_loop kernel/sched/core.c:7267 [inline] schedule+0x34/0x11c kernel/sched/core.c:7282 schedule_timeout+0xd4/0x110 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:100 [inline] __wait_for_common kernel/sched/completion.c:121 [inline] wait_for_common kernel/sched/completion.c:132 [inline] wait_for_completion+0x78/0x160 kernel/sched/completion.c:153 __synchronize_srcu+0x90/0xd0 kernel/rcu/srcutree.c:1496 synchronize_srcu_expedited+0x24/0x40 kernel/rcu/srcutree.c:1521 kvm_set_irq_routing+0x204/0x294 virt/kvm/irqchip.c:225 kvm_vgic_setup_default_irq_routing+0x84/0xb0 arch/arm64/kvm/vgic/vgic-irqfd.c:153 vgic_init+0x1cc/0x2d8 arch/arm64/kvm/vgic/vgic-init.c:481 vgic_lazy_init+0x54/0x70 arch/arm64/kvm/vgic/vgic-init.c:610 kvm_vgic_inject_irq+0x30/0x188 arch/arm64/kvm/vgic/vgic.c:539 kvm_timer_update_irq+0x88/0xf8 arch/arm64/kvm/arch_timer.c:467 kvm_timer_vcpu_reset+0xd8/0x1e0 arch/arm64/kvm/arch_timer.c:1059 kvm_reset_vcpu+0x194/0x360 arch/arm64/kvm/reset.c:268 kvm_vcpu_set_target arch/arm64/kvm/arm.c:1681 [inline] kvm_arch_vcpu_ioctl_vcpu_init arch/arm64/kvm/arm.c:1701 [inline] kvm_arch_vcpu_ioctl+0x2f0/0x8d8 arch/arm64/kvm/arm.c:1822 kvm_vcpu_ioctl+0x4a0/0x8e4 virt/kvm/kvm_main.c:4646 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __arm64_sys_ioctl+0xac/0x104 fs/ioctl.c:583 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x54/0x10c arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:121 do_el0_svc+0x1c/0x34 arch/arm64/kernel/syscall.c:140 el0_svc+0x38/0x15c arch/arm64/kernel/entry-common.c:723 el0t_64_sync_handler+0xa0/0xf0 arch/arm64/kernel/entry-common.c:742 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:594 BUG: scheduling while atomic: syz.2.18/4067/0x00000000 Modules linked in: CPU: 1 UID: 0 PID: 4067 Comm: syz.2.18 Tainted: G W syzkaller #0 PREEMPT Tainted: [W]=WARN Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace arch/arm64/kernel/stacktrace.c:498 [inline] (C) show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x60/0x80 lib/dump_stack.c:120 dump_stack+0x18/0x24 lib/dump_stack.c:129 __schedule_bug+0x54/0x78 kernel/sched/core.c:5936 schedule_debug kernel/sched/core.c:5963 [inline] __schedule+0x89c/0xddc kernel/sched/core.c:7038 __schedule_loop kernel/sched/core.c:7267 [inline] schedule+0x34/0x11c kernel/sched/core.c:7282 futex_do_wait kernel/futex/waitwake.c:358 [inline] __futex_wait+0xf0/0x178 kernel/futex/waitwake.c:691 futex_wait+0x88/0x118 kernel/futex/waitwake.c:719 do_futex+0xf8/0x1a0 kernel/futex/syscalls.c:130 __do_sys_futex kernel/futex/syscalls.c:207 [inline] __se_sys_futex kernel/futex/syscalls.c:188 [inline] __arm64_sys_futex+0xfc/0x1a0 kernel/futex/syscalls.c:188 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x54/0x10c arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:121 do_el0_svc+0x1c/0x34 arch/arm64/kernel/syscall.c:140 el0_svc+0x38/0x15c arch/arm64/kernel/entry-common.c:723 el0t_64_sync_handler+0xa0/0xf0 arch/arm64/kernel/entry-common.c:742 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:594 Tested on: commit: 08d0d346 Merge tag 'net-7.1-rc2' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15a2f2d2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9475bd041c93289 dashboard link: https://syzkaller.appspot.com/bug?extid=12b178b7c756664d2518 compiler: aarch64-linux-gnu-gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 userspace arch: arm64 patch: https://syzkaller.appspot.com/x/patch.diff?x=1142f2d2580000