================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz.0.17/6003 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff888036e79be8 (slock-AF_PHONET/1){+.?.}-{3:3}, at: __sk_receive_skb+0x23c/0xa90 net/core/sock.c:570 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868 _raw_spin_lock_nested+0x32/0x50 kernel/locking/spinlock.c:378 __sk_receive_skb+0x23c/0xa90 net/core/sock.c:570 sk_receive_skb include/net/sock.h:2023 [inline] pep_do_rcv+0x685/0xaa0 net/phonet/pep.c:675 sk_backlog_rcv include/net/sock.h:1190 [inline] __release_sock+0x297/0x3a0 net/core/sock.c:3213 release_sock+0x5f/0x1f0 net/core/sock.c:3811 pep_sock_accept+0xed3/0x1410 net/phonet/pep.c:879 pn_socket_accept+0xc9/0x2e0 net/phonet/socket.c:303 do_accept+0x6ba/0x920 net/socket.c:2067 __sys_accept4_file net/socket.c:2101 [inline] __sys_accept4+0x139/0x230 net/socket.c:2123 __do_sys_accept4 net/socket.c:2130 [inline] __se_sys_accept4 net/socket.c:2127 [inline] __x64_sys_accept4+0x9a/0xb0 net/socket.c:2127 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f irq event stamp: 1148 hardirqs last enabled at (1148): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:187 [inline] hardirqs last enabled at (1148): [] _raw_spin_unlock_irq+0x23/0x50 kernel/locking/spinlock.c:202 hardirqs last disabled at (1147): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:140 [inline] hardirqs last disabled at (1147): [] _raw_spin_lock_irq+0x17/0x50 kernel/locking/spinlock.c:170 softirqs last enabled at (1142): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (1142): [] netif_rx+0x79/0x90 net/core/dev.c:5744 softirqs last disabled at (1143): [] do_softirq+0x76/0xd0 kernel/softirq.c:523 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.0.17/6003: #0: ffff88805a2f0848 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff88805a2f0848 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: __sock_release+0x89/0x250 net/socket.c:730 #1: ffff888034584360 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1714 [inline] #1: ffff888034584360 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: pep_sock_close+0x86/0x5b0 net/phonet/pep.c:742 #2: ffffffff8eb5e8a0 (rcu_read_lock){....}-{1:3}, at: local_lock_acquire include/linux/local_lock_internal.h:46 [inline] #2: ffffffff8eb5e8a0 (rcu_read_lock){....}-{1:3}, at: process_backlog+0x3eb/0x1950 net/core/dev.c:6638 #3: ffff888034584968 (slock-AF_PHONET){+.-.}-{3:3}, at: spin_lock include/linux/spinlock.h:342 [inline] #3: ffff888034584968 (slock-AF_PHONET){+.-.}-{3:3}, at: __sk_receive_skb+0x26e/0xa90 net/core/sock.c:572 #4: ffff8880345849e0 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: sk_receive_skb include/net/sock.h:2023 [inline] #4: ffff8880345849e0 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: phonet_rcv+0x781/0xc40 net/phonet/af_phonet.c:-1 stack backtrace: CPU: 0 UID: 0 PID: 6003 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_usage_bug+0x28b/0x2e0 kernel/locking/lockdep.c:4042 valid_state kernel/locking/lockdep.c:4056 [inline] mark_lock_irq+0x410/0x420 kernel/locking/lockdep.c:-1 mark_lock+0x115/0x190 kernel/locking/lockdep.c:4753 mark_usage kernel/locking/lockdep.c:-1 [inline] __lock_acquire+0x689/0x2cf0 kernel/locking/lockdep.c:5191 lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868 _raw_spin_lock_nested+0x32/0x50 kernel/locking/spinlock.c:378 __sk_receive_skb+0x23c/0xa90 net/core/sock.c:570 sk_receive_skb include/net/sock.h:2023 [inline] pep_do_rcv+0x685/0xaa0 net/phonet/pep.c:675 sk_backlog_rcv include/net/sock.h:1190 [inline] __sk_receive_skb+0xa07/0xa90 net/core/sock.c:579 sk_receive_skb include/net/sock.h:2023 [inline] phonet_rcv+0x781/0xc40 net/phonet/af_phonet.c:-1 __netif_receive_skb_one_core net/core/dev.c:6178 [inline] __netif_receive_skb net/core/dev.c:6291 [inline] process_backlog+0xc66/0x1950 net/core/dev.c:6642 __napi_poll+0xae/0x340 net/core/dev.c:7706 napi_poll net/core/dev.c:7769 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7926 handle_softirqs+0x22a/0x870 kernel/softirq.c:626 do_softirq+0x76/0xd0 kernel/softirq.c:523 __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450 local_bh_enable include/linux/bottom_half.h:33 [inline] netif_rx+0x83/0x90 net/core/dev.c:5744 pn_send+0x62a/0x8e0 net/phonet/af_phonet.c:185 pn_skb_send+0x218/0x530 net/phonet/af_phonet.c:272 pep_sock_close+0x2c1/0x5b0 include/linux/skbuff.h:-1 pn_socket_release+0x9b/0xc0 net/phonet/socket.c:34 __sock_release+0xb9/0x250 net/socket.c:731 sock_close+0x1c/0x30 net/socket.c:1534 __fput+0x44f/0xa70 fs/file_table.c:469 task_work_run+0x1d9/0x270 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:269 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7b1199c799 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:00007fff61339178 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f7b11c17da0 RCX: 00007f7b1199c799 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f7b11c17da0 R08: 00007f7b11c16038 R09: 0000000000000000 R10: 000000000003fda8 R11: 0000000000000246 R12: 00000000000196dc R13: 00007f7b11c1609c R14: 000000000001940c R15: 00007f7b11c16090