watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.1:12500] Modules linked in: irq event stamp: 5498 hardirqs last enabled at (5497): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:82 [inline] hardirqs last enabled at (5497): [] exit_to_kernel_mode+0x38/0x210 arch/arm64/kernel/entry-common.c:92 hardirqs last disabled at (5498): [] __el1_irq arch/arm64/kernel/entry-common.c:435 [inline] hardirqs last disabled at (5498): [] el1_interrupt+0x24/0x50 arch/arm64/kernel/entry-common.c:460 softirqs last enabled at (1594): [] _stext+0x9ec/0x101c softirqs last disabled at (1561): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (1561): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (1561): [] __irq_exit_rcu+0x3d8/0x5d0 kernel/softirq.c:636 CPU: 0 PID: 12500 Comm: syz-executor.1 Not tainted 5.15.0-syzkaller-02229-gbfc484fe6abb #0 Hardware name: linux,dummy-virt (DT) pstate: 10000005 (nzcV daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : rcu_rnp_online_cpus kernel/rcu/tree.c:221 [inline] pc : rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1171 [inline] pc : rcu_lockdep_current_cpu_online+0x118/0x210 kernel/rcu/tree.c:1160 lr : rcu_read_lock_held_common kernel/rcu/update.c:112 [inline] lr : rcu_read_lock_held_common kernel/rcu/update.c:102 [inline] lr : rcu_read_lock_sched_held+0x40/0xd0 kernel/rcu/update.c:123 sp : ffff80001aef79a0 x29: ffff80001aef79a0 x28: ffff8000150b6e80 x27: ffff00001486c440 x26: 1fffe0000290d888 x25: ffff800010697114 x24: 0000000000000000 x23: 0000000000000001 x22: 0000000000000001 x21: ffff800015becb18 x20: ffff800015dd4540 x19: 0000000000000001 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 000000002073f9ac x14: 1ffff000035def1e x13: 0000000000000168 x12: ffff7000035def82 x11: 1ffff000035def81 x10: ffff7000035def81 x9 : dfff800000000000 x8 : ffff80001aef7c0c x7 : 0000000041b58ab3 x6 : ffff800010697114 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 1fffe000012d09f1 x2 : 1ffff00002bba8b6 x1 : 0000000000000000 x0 : ffff800015dd45b0 Call trace: rcu_rnp_online_cpus kernel/rcu/tree.c:221 [inline] rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1171 [inline] rcu_lockdep_current_cpu_online+0x118/0x210 kernel/rcu/tree.c:1160 rcu_read_lock_held_common kernel/rcu/update.c:112 [inline] rcu_read_lock_held_common kernel/rcu/update.c:102 [inline] rcu_read_lock_sched_held+0x40/0xd0 kernel/rcu/update.c:123 trace_lock_acquire+0x118/0x4b0 include/trace/events/lock.h:13 lock_acquire+0x3c/0xb4 kernel/locking/lockdep.c:5596 __might_fault mm/memory.c:5273 [inline] __might_fault+0xcc/0x140 mm/memory.c:5258 _copy_from_user include/linux/uaccess.h:156 [inline] copy_from_user include/linux/uaccess.h:192 [inline] snd_seq_oss_write+0x12c/0x794 sound/core/seq/oss/seq_oss_rw.c:93 odev_write+0x38/0x74 sound/core/seq/oss/seq_oss.c:168 vfs_write+0x1cc/0x5c0 fs/read_write.c:588 ksys_write+0xec/0x1d0 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __arm64_sys_write+0x6c/0xa0 fs/read_write.c:652 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x6c/0x260 arch/arm64/kernel/syscall.c:52 el0_svc_common.constprop.0+0xc4/0x254 arch/arm64/kernel/syscall.c:142 do_el0_svc_compat+0x40/0x80 arch/arm64/kernel/syscall.c:187 el0_svc_compat+0x64/0x280 arch/arm64/kernel/entry-common.c:736 el0t_32_sync_handler+0x90/0x140 arch/arm64/kernel/entry-common.c:746 el0t_32_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:577