================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz.0.0/5320 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff8880367e3c68 (slock-AF_PHONET/1){+.?.}-{3:3}, at: __sk_receive_skb+0x1bf/0x9e0 net/core/sock.c:563 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 _raw_spin_lock_nested+0x32/0x50 kernel/locking/spinlock.c:382 __sk_receive_skb+0x1bf/0x9e0 net/core/sock.c:563 sk_receive_skb include/net/sock.h:2022 [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:3216 release_sock+0x190/0x260 net/core/sock.c:3815 pep_sock_accept+0xdf5/0x12b0 net/phonet/pep.c:879 pn_socket_accept+0xc9/0x2e0 net/phonet/socket.c:309 do_accept+0x521/0x760 net/socket.c:2047 __sys_accept4_file net/socket.c:2081 [inline] __sys_accept4+0x139/0x230 net/socket.c:2103 __do_sys_accept4 net/socket.c:2110 [inline] __se_sys_accept4 net/socket.c:2107 [inline] __x64_sys_accept4+0x9a/0xb0 net/socket.c:2107 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f irq event stamp: 2582 hardirqs last enabled at (2582): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:187 [inline] hardirqs last enabled at (2582): [] _raw_spin_unlock_irq+0x23/0x50 kernel/locking/spinlock.c:206 hardirqs last disabled at (2581): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:140 [inline] hardirqs last disabled at (2581): [] _raw_spin_lock_irq+0x17/0x50 kernel/locking/spinlock.c:174 softirqs last enabled at (2576): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (2576): [] netif_rx+0x79/0x90 net/core/dev.c:5775 softirqs last disabled at (2577): [] 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.0.0/5320: #0: ffff888046e23840 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1029 [inline] #0: ffff888046e23840 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: __sock_release net/socket.c:721 [inline] #0: ffff888046e23840 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: sock_close+0x9b/0x240 net/socket.c:1514 #1: ffff8880367e4360 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #1: ffff8880367e4360 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: pep_sock_close+0x86/0x5b0 net/phonet/pep.c:742 #2: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: local_lock_acquire include/linux/local_lock_internal.h:46 [inline] #2: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: process_backlog+0x3eb/0x1950 net/core/dev.c:6662 #3: ffff8880367e4968 (slock-AF_PHONET){+.-.}-{3:3}, at: spin_lock include/linux/spinlock.h:342 [inline] #3: ffff8880367e4968 (slock-AF_PHONET){+.-.}-{3:3}, at: __sk_receive_skb+0x1f1/0x9e0 net/core/sock.c:565 #4: ffff8880367e49e0 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: sk_receive_skb include/net/sock.h:2022 [inline] #4: ffff8880367e49e0 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: phonet_rcv+0x781/0xc40 net/phonet/af_phonet.c:-1 stack backtrace: CPU: 0 UID: 0 PID: 5320 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 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+0x106/0x350 kernel/locking/lockdep.c:5868 _raw_spin_lock_nested+0x32/0x50 kernel/locking/spinlock.c:382 __sk_receive_skb+0x1bf/0x9e0 net/core/sock.c:563 sk_receive_skb include/net/sock.h:2022 [inline] pep_do_rcv+0x685/0xaa0 net/phonet/pep.c:675 sk_backlog_rcv include/net/sock.h:1190 [inline] __sk_receive_skb+0x962/0x9e0 net/core/sock.c:572 sk_receive_skb include/net/sock.h:2022 [inline] phonet_rcv+0x781/0xc40 net/phonet/af_phonet.c:-1 __netif_receive_skb_one_core net/core/dev.c:6202 [inline] __netif_receive_skb net/core/dev.c:6315 [inline] process_backlog+0xc66/0x1950 net/core/dev.c:6666 __napi_poll+0xae/0x340 net/core/dev.c:7733 napi_poll net/core/dev.c:7796 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7953 handle_softirqs+0x22a/0x840 kernel/softirq.c:622 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:5775 pn_send+0x62a/0x8e0 net/phonet/af_phonet.c:188 pn_skb_send+0x218/0x510 net/phonet/af_phonet.c:275 pep_sock_close+0x2c1/0x5b0 include/linux/skbuff.h:-1 pn_socket_release+0x9b/0xc0 net/phonet/socket.c:34 __sock_release net/socket.c:722 [inline] sock_close+0xc3/0x240 net/socket.c:1514 __fput+0x44f/0xa60 fs/file_table.c:510 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+0xf3/0x4d0 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f831379ce59 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:00007fff4a466e68 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f8313a17da0 RCX: 00007f831379ce59 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f8313a17da0 R08: 00007f8313a16038 R09: 0000000000000000 R10: 0000000000dffca4 R11: 0000000000000246 R12: 0000000000015650 R13: 00007f8313a1609c R14: 000000000001561e R15: 00007f8313a16090