================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. ksoftirqd/0/15 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff0000d0a11ff0 (slock-AF_PHONET/1){+.?.}-{2:2}, at: __sk_receive_skb+0x154/0x850 net/core/sock.c:560 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662 _raw_spin_lock_nested+0x5c/0x78 kernel/locking/spinlock.c:378 __sk_receive_skb+0x154/0x850 net/core/sock.c:560 sk_receive_skb include/net/sock.h:2097 [inline] pep_do_rcv+0x4b4/0x758 net/phonet/pep.c:675 sk_backlog_rcv include/net/sock.h:1138 [inline] __release_sock+0x1b4/0x3b4 net/core/sock.c:2945 release_sock+0x60/0x1bc net/core/sock.c:3511 pep_sock_accept+0xc7c/0x1360 net/phonet/pep.c:879 pn_socket_accept+0x120/0x2dc net/phonet/socket.c:304 do_accept+0x448/0x5fc net/socket.c:1890 __sys_accept4_file net/socket.c:1931 [inline] __sys_accept4+0xb4/0x12c net/socket.c:1961 __do_sys_accept4 net/socket.c:1972 [inline] __se_sys_accept4 net/socket.c:1969 [inline] __arm64_sys_accept4+0x9c/0xb8 net/socket.c:1969 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 irq event stamp: 484448 hardirqs last enabled at (484448): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] hardirqs last enabled at (484448): [] _raw_spin_unlock_irq+0x3c/0x90 kernel/locking/spinlock.c:202 hardirqs last disabled at (484447): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline] hardirqs last disabled at (484447): [] _raw_spin_lock_irq+0x34/0x98 kernel/locking/spinlock.c:170 softirqs last enabled at (484376): [] softirq_handle_end kernel/softirq.c:439 [inline] softirqs last enabled at (484376): [] handle_softirqs+0xaec/0xc60 kernel/softirq.c:624 softirqs last disabled at (484381): [] run_ksoftirqd+0x7c/0x2ac kernel/softirq.c:968 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(slock-AF_PHONET/1); lock(slock-AF_PHONET/1); *** DEADLOCK *** 3 locks held by ksoftirqd/0/15: #0: ffff8000153f72c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x18/0x54 include/linux/rcupdate.h:349 #1: ffff0000f1199ff0 (slock-AF_PHONET){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #1: ffff0000f1199ff0 (slock-AF_PHONET){+.-.}-{2:2}, at: __sk_receive_skb+0x164/0x850 net/core/sock.c:562 #2: ffff0000f119a070 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: sk_receive_skb include/net/sock.h:2097 [inline] #2: ffff0000f119a070 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: phonet_rcv+0x600/0xa4c net/phonet/af_phonet.c:-1 stack backtrace: CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call trace: dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_usage_bug+0x4c0/0x6d8 kernel/locking/lockdep.c:3957 valid_state kernel/locking/lockdep.c:3969 [inline] mark_lock_irq+0x850/0xab0 kernel/locking/lockdep.c:-1 mark_lock+0x224/0x320 kernel/locking/lockdep.c:4628 mark_usage kernel/locking/lockdep.c:-1 [inline] __lock_acquire+0xa78/0x6800 kernel/locking/lockdep.c:5003 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662 _raw_spin_lock_nested+0x5c/0x78 kernel/locking/spinlock.c:378 __sk_receive_skb+0x154/0x850 net/core/sock.c:560 sk_receive_skb include/net/sock.h:2097 [inline] pep_do_rcv+0x4b4/0x758 net/phonet/pep.c:675 sk_backlog_rcv include/net/sock.h:1138 [inline] __sk_receive_skb+0x3d0/0x850 net/core/sock.c:569 sk_receive_skb include/net/sock.h:2097 [inline] phonet_rcv+0x600/0xa4c net/phonet/af_phonet.c:-1 __netif_receive_skb_one_core net/core/dev.c:5619 [inline] __netif_receive_skb+0xcc/0x2a8 net/core/dev.c:5733 process_backlog+0x408/0x710 net/core/dev.c:6061 __napi_poll+0xb4/0x3f0 net/core/dev.c:6628 napi_poll net/core/dev.c:6695 [inline] net_rx_action+0x514/0xb18 net/core/dev.c:6809 handle_softirqs+0x318/0xc60 kernel/softirq.c:596 run_ksoftirqd+0x7c/0x2ac kernel/softirq.c:968 smpboot_thread_fn+0x4b0/0x964 kernel/smpboot.c:164 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850