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Sun, 12 Apr 2026 22:02:05 -0700 (PDT) Date: Sun, 12 Apr 2026 22:02:05 -0700 In-Reply-To: <20260413124911.042464@splitlinedeMacBook-Pro.local> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69dc78cd.a00a0220.468cb.0042.GAE@google.com> Subject: Re: [syzbot] [fuse?] 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.2.40/4121/0x00000002 Modules linked in: CPU: 0 UID: 0 PID: 4121 Comm: syz.2.40 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:5847 schedule_debug kernel/sched/core.c:5874 [inline] __schedule+0x858/0xd84 kernel/sched/core.c:6786 __schedule_loop kernel/sched/core.c:6993 [inline] schedule+0x34/0x114 kernel/sched/core.c:7008 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+0x78/0xc0 arch/arm64/kvm/vgic/vgic-irqfd.c:153 vgic_init+0x1ac/0x268 arch/arm64/kvm/vgic/vgic-init.c:421 vgic_lazy_init+0x54/0x6c arch/arm64/kvm/vgic/vgic-init.c:550 kvm_vgic_inject_irq+0x30/0x12c arch/arm64/kvm/vgic/vgic.c:520 kvm_timer_update_irq+0x68/0x7c arch/arm64/kvm/arch_timer.c:450 kvm_timer_vcpu_reset+0xd8/0x1e0 arch/arm64/kvm/arch_timer.c:1036 kvm_reset_vcpu+0x194/0x360 arch/arm64/kvm/reset.c:268 kvm_vcpu_set_target arch/arm64/kvm/arm.c:1632 [inline] kvm_arch_vcpu_ioctl_vcpu_init arch/arm64/kvm/arm.c:1652 [inline] kvm_arch_vcpu_ioctl+0x2e4/0x8c8 arch/arm64/kvm/arm.c:1773 kvm_vcpu_ioctl+0x4ac/0x8f4 virt/kvm/kvm_main.c:4653 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+0x48/0x104 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:151 el0_svc+0x34/0x124 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0xa0/0xf0 arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:596 BUG: scheduling while atomic: syz.2.40/4121/0x00000000 Modules linked in: CPU: 0 UID: 0 PID: 4121 Comm: syz.2.40 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:5847 schedule_debug kernel/sched/core.c:5874 [inline] __schedule+0x858/0xd84 kernel/sched/core.c:6786 __schedule_loop kernel/sched/core.c:6993 [inline] schedule+0x34/0x114 kernel/sched/core.c:7008 futex_do_wait kernel/futex/waitwake.c:358 [inline] __futex_wait+0xf0/0x178 kernel/futex/waitwake.c:687 futex_wait+0x88/0x118 kernel/futex/waitwake.c:715 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+0x48/0x104 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:151 el0_svc+0x34/0x124 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0xa0/0xf0 arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:596 Tested on: commit: 028ef9c9 Linux 7.0 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=132b80ce580000 kernel config: https://syzkaller.appspot.com/x/.config?x=2d08886358f27e8c 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 Note: no patches were applied.