================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz.2.863/7458 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff0000d1ac0d30 (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_accept net/socket.c:1978 [inline] __se_sys_accept net/socket.c:1975 [inline] __arm64_sys_accept+0x80/0x98 net/socket.c:1975 __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: 4572 hardirqs last enabled at (4572): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] hardirqs last enabled at (4572): [] _raw_spin_unlock_irq+0x3c/0x90 kernel/locking/spinlock.c:202 hardirqs last disabled at (4571): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline] hardirqs last disabled at (4571): [] _raw_spin_lock_irq+0x34/0x98 kernel/locking/spinlock.c:170 softirqs last enabled at (4566): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (4567): [] __do_softirq+0x14/0x20 kernel/softirq.c:630 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(slock-AF_PHONET/1); lock(slock-AF_PHONET/1); *** DEADLOCK *** 5 locks held by syz.2.863/7458: #0: ffff0000cf9de210 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff0000cf9de210 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: __sock_release net/socket.c:653 [inline] #0: ffff0000cf9de210 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: sock_close+0x7c/0x1f8 net/socket.c:1399 #1: ffff0000f3860130 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1805 [inline] #1: ffff0000f3860130 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: pep_sock_close+0x94/0x744 net/phonet/pep.c:742 #2: ffff8000153f72c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x18/0x54 include/linux/rcupdate.h:349 #3: ffff0000d1ac06f0 (slock-AF_PHONET){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #3: ffff0000d1ac06f0 (slock-AF_PHONET){+.-.}-{2:2}, at: __sk_receive_skb+0x164/0x850 net/core/sock.c:562 #4: ffff0000d1ac0770 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: sk_receive_skb include/net/sock.h:2097 [inline] #4: ffff0000d1ac0770 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: phonet_rcv+0x600/0xa4c net/phonet/af_phonet.c:-1 stack backtrace: CPU: 0 PID: 7458 Comm: syz.2.863 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 __do_softirq+0x14/0x20 kernel/softirq.c:630 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:897 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:85 do_softirq+0xf8/0x1a8 kernel/softirq.c:497 __local_bh_enable_ip+0x250/0x37c kernel/softirq.c:421 local_bh_enable+0x28/0x34 include/linux/bottom_half.h:33 netif_rx+0xa4/0xc4 net/core/dev.c:5140 pn_send+0x454/0x6d8 net/phonet/af_phonet.c:185 pn_skb_send+0x1dc/0x50c net/phonet/af_phonet.c:272 pep_sock_close+0x3e4/0x744 include/linux/skbuff.h:-1 pn_socket_release+0x9c/0xbc net/phonet/socket.c:34 __sock_release net/socket.c:654 [inline] sock_close+0xb4/0x1f8 net/socket.c:1399 __fput+0x1bc/0x7b8 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x1ec/0x278 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x1fa0/0x2aa4 arch/arm64/kernel/signal.c:1151 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585