================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz.1.9/5863 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff88807cbb86f0 (slock-AF_PHONET/1){+.?.}-{2:2}, at: __sk_receive_skb+0x180/0x990 net/core/sock.c:564 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 _raw_spin_lock_nested+0x32/0x50 kernel/locking/spinlock.c:378 __sk_receive_skb+0x180/0x990 net/core/sock.c:564 sk_receive_skb include/net/sock.h:2071 [inline] pep_do_rcv+0x682/0xa90 net/phonet/pep.c:675 sk_backlog_rcv include/net/sock.h:1142 [inline] __release_sock+0x1e5/0x460 net/core/sock.c:3011 release_sock+0x5f/0x1c0 net/core/sock.c:3550 pep_sock_accept+0xd58/0x12d0 net/phonet/pep.c:879 pn_socket_accept+0x12a/0x370 net/phonet/socket.c:304 do_accept+0x4d8/0x6c0 net/socket.c:1937 __sys_accept4_file net/socket.c:1977 [inline] __sys_accept4+0x9b/0x100 net/socket.c:2007 __do_sys_accept net/socket.c:2024 [inline] __se_sys_accept net/socket.c:2021 [inline] __x64_sys_accept+0x7d/0x90 net/socket.c:2021 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 irq event stamp: 5268 hardirqs last enabled at (5268): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] hardirqs last enabled at (5268): [] _raw_spin_unlock_irq+0x23/0x50 kernel/locking/spinlock.c:202 hardirqs last disabled at (5267): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline] hardirqs last disabled at (5267): [] _raw_spin_lock_irq+0x8a/0xf0 kernel/locking/spinlock.c:170 softirqs last enabled at (5262): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (5262): [] netif_rx+0x79/0x90 net/core/dev.c:5232 softirqs last disabled at (5263): [] do_softirq+0xfa/0x1a0 kernel/softirq.c:479 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.1.9/5863: #0: ffff8880775a5c20 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #0: ffff8880775a5c20 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: __sock_release net/socket.c:658 [inline] #0: ffff8880775a5c20 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: sock_close+0x9b/0x230 net/socket.c:1420 #1: ffff88807cbb8130 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1780 [inline] #1: ffff88807cbb8130 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: pep_sock_close+0x86/0x5b0 net/phonet/pep.c:742 #2: ffffffff8d132120 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #2: ffffffff8d132120 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #2: ffffffff8d132120 (rcu_read_lock){....}-{1:2}, at: process_backlog+0x2cf/0x6f0 net/core/dev.c:6087 #3: ffff8880243b00b0 (slock-AF_PHONET){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #3: ffff8880243b00b0 (slock-AF_PHONET){+.-.}-{2:2}, at: __sk_receive_skb+0x18f/0x990 net/core/sock.c:566 #4: ffff8880243b0130 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: sk_receive_skb include/net/sock.h:2071 [inline] #4: ffff8880243b0130 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: phonet_rcv+0x78f/0xc80 net/phonet/af_phonet.c:-1 stack backtrace: CPU: 0 PID: 5863 Comm: syz.1.9 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 valid_state+0x13b/0x1d0 kernel/locking/lockdep.c:4013 mark_lock_irq+0xad/0x900 kernel/locking/lockdep.c:4216 mark_lock+0x208/0x320 kernel/locking/lockdep.c:4678 mark_usage kernel/locking/lockdep.c:-1 [inline] __lock_acquire+0xd1a/0x7d40 kernel/locking/lockdep.c:5091 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 _raw_spin_lock_nested+0x32/0x50 kernel/locking/spinlock.c:378 __sk_receive_skb+0x180/0x990 net/core/sock.c:564 sk_receive_skb include/net/sock.h:2071 [inline] pep_do_rcv+0x682/0xa90 net/phonet/pep.c:675 sk_backlog_rcv include/net/sock.h:1142 [inline] __sk_receive_skb+0x436/0x990 net/core/sock.c:573 sk_receive_skb include/net/sock.h:2071 [inline] phonet_rcv+0x78f/0xc80 net/phonet/af_phonet.c:-1 __netif_receive_skb_one_core net/core/dev.c:5646 [inline] __netif_receive_skb+0xcc/0x290 net/core/dev.c:5760 process_backlog+0x391/0x6f0 net/core/dev.c:6088 __napi_poll+0xc0/0x460 net/core/dev.c:6650 napi_poll net/core/dev.c:6717 [inline] net_rx_action+0x616/0xc40 net/core/dev.c:6853 handle_softirqs+0x280/0x820 kernel/softirq.c:578 do_softirq+0xfa/0x1a0 kernel/softirq.c:479 __local_bh_enable_ip+0x184/0x1c0 kernel/softirq.c:406 local_bh_enable include/linux/bottom_half.h:33 [inline] netif_rx+0x83/0x90 net/core/dev.c:5232 pn_send+0x553/0x7f0 net/phonet/af_phonet.c:185 pn_skb_send+0x218/0x510 net/phonet/af_phonet.c:272 pep_sock_close+0x2c1/0x5b0 include/linux/skbuff.h:-1 pn_socket_release+0x95/0xb0 net/phonet/socket.c:34 __sock_release net/socket.c:659 [inline] sock_close+0xbd/0x230 net/socket.c:1420 __fput+0x234/0x970 fs/file_table.c:384 task_work_run+0x1d4/0x260 kernel/task_work.c:245 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f5d7039ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff6d260058 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007fff6d260140 RCX: 00007f5d7039ce59 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 000000000001789e R08: 0000000000000001 R09: 0000000000000000 R10: 0000001b2c820000 R11: 0000000000000246 R12: 00007fff6d260180 R13: 00007f5d70615fac R14: 0000000000017aa3 R15: 00007f5d70615fa0