================================ WARNING: inconsistent lock state 5.5.0-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.4/9792 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff88805edf79c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: spin_lock include/linux/spinlock.h:338 [inline] ffff88805edf79c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_one_client_conn net/rxrpc/conn_client.c:948 [inline] ffff88805edf79c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_client_conn+0x6ed/0xc90 net/rxrpc/conn_client.c:1001 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:338 [inline] rxrpc_get_client_conn net/rxrpc/conn_client.c:304 [inline] rxrpc_connect_call+0x358/0x4e30 net/rxrpc/conn_client.c:701 rxrpc_new_client_call+0x9c0/0x1ad0 net/rxrpc/call_object.c:290 rxrpc_new_client_call_for_sendmsg net/rxrpc/sendmsg.c:595 [inline] rxrpc_do_sendmsg+0xffa/0x1d5f net/rxrpc/sendmsg.c:652 rxrpc_sendmsg+0x4d6/0x5f0 net/rxrpc/af_rxrpc.c:586 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:672 ____sys_sendmsg+0x358/0x880 net/socket.c:2343 ___sys_sendmsg+0x100/0x170 net/socket.c:2397 __sys_sendmmsg+0x1bf/0x4d0 net/socket.c:2487 __do_sys_sendmmsg net/socket.c:2516 [inline] __se_sys_sendmmsg net/socket.c:2513 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2513 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe irq event stamp: 2302602 hardirqs last enabled at (2302602): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (2302602): [] _raw_spin_unlock_irqrestore+0x66/0xe0 kernel/locking/spinlock.c:191 hardirqs last disabled at (2302601): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (2302601): [] _raw_spin_lock_irqsave+0x6f/0xcd kernel/locking/spinlock.c:159 softirqs last enabled at (2300236): [] __do_softirq+0x6cd/0x98c kernel/softirq.c:319 softirqs last disabled at (2302517): [] invoke_softirq kernel/softirq.c:373 [inline] softirqs last disabled at (2302517): [] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&(&local->client_conns_lock)->rlock); lock(&(&local->client_conns_lock)->rlock); *** DEADLOCK *** 2 locks held by syz-executor.4/9792: #0: ffff888099924428 (sb_writers#3){.+.+}, at: sb_start_write include/linux/fs.h:1650 [inline] #0: ffff888099924428 (sb_writers#3){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:354 #1: ffffffff89babac0 (rcu_callback){....}, at: rcu_do_batch kernel/rcu/tree.c:2176 [inline] #1: ffffffff89babac0 (rcu_callback){....}, at: rcu_core+0x562/0x1390 kernel/rcu/tree.c:2410 stack backtrace: CPU: 0 PID: 9792 Comm: syz-executor.4 Not tainted 5.5.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 print_usage_bug.cold+0x327/0x378 kernel/locking/lockdep.c:3100 valid_state kernel/locking/lockdep.c:3111 [inline] mark_lock_irq kernel/locking/lockdep.c:3308 [inline] mark_lock+0xbb4/0x1220 kernel/locking/lockdep.c:3665 mark_usage kernel/locking/lockdep.c:3565 [inline] __lock_acquire+0x1e8e/0x4a00 kernel/locking/lockdep.c:3908 lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:338 [inline] rxrpc_put_one_client_conn net/rxrpc/conn_client.c:948 [inline] rxrpc_put_client_conn+0x6ed/0xc90 net/rxrpc/conn_client.c:1001 rxrpc_put_connection net/rxrpc/ar-internal.h:965 [inline] rxrpc_rcu_destroy_call+0xbd/0x200 net/rxrpc/call_object.c:572 rcu_do_batch kernel/rcu/tree.c:2186 [inline] rcu_core+0x5e1/0x1390 kernel/rcu/tree.c:2410 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2419 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:kmem_cache_free+0xab/0x320 mm/slab.c:3695 Code: e8 4a 29 00 00 84 c0 74 77 41 f7 c6 00 02 00 00 74 4f e8 98 4c c7 ff 48 83 3d e8 09 00 08 00 0f 84 fa 01 00 00 4c 89 f7 57 9d <0f> 1f 44 00 00 4c 8b 6d 08 0f 1f 44 00 00 65 8b 05 30 13 4e 7e 83 RSP: 0018:ffffc9000665f738 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff888092a95dc8 RCX: 0000000000000007 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000286 RBP: ffffc9000665f758 R08: 1ffffffff16a1d7d R09: fffffbfff16a1d7e R10: fffffbfff16a1d7d R11: ffffffff8b50ebef R12: ffff8880a484f1c0 R13: ffffffff81ce0899 R14: 0000000000000286 R15: ffff888092a95dc8 free_buffer_head+0x49/0xc0 fs/buffer.c:3400 try_to_free_buffers+0x3a0/0x7e0 fs/buffer.c:3315 ext4_releasepage+0x3d6/0x4f0 fs/ext4/inode.c:3296 try_to_release_page+0x2cc/0x4a0 mm/filemap.c:3483 block_invalidatepage+0x577/0x650 fs/buffer.c:1541 ext4_invalidatepage+0x1f6/0x500 fs/ext4/inode.c:3256 do_invalidatepage mm/truncate.c:163 [inline] truncate_cleanup_page+0x328/0x680 mm/truncate.c:185 truncate_inode_pages_range+0x5f3/0x1980 mm/truncate.c:365 truncate_inode_pages mm/truncate.c:476 [inline] truncate_inode_pages_final+0xa0/0xe0 mm/truncate.c:527 ext4_evict_inode+0x510/0x1590 fs/ext4/inode.c:221 evict+0x306/0x680 fs/inode.c:575 iput_final fs/inode.c:1571 [inline] iput+0x55d/0x900 fs/inode.c:1597 do_unlinkat+0x44c/0x6d0 fs/namei.c:4143 __do_sys_unlink fs/namei.c:4184 [inline] __se_sys_unlink fs/namei.c:4182 [inline] __x64_sys_unlink+0x42/0x50 fs/namei.c:4182 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b0e7 Code: 00 66 90 b8 58 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 4d b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 2d b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffebc8b5068 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045b0e7 RDX: 00007ffebc8b5080 RSI: 00007ffebc8b5080 RDI: 00007ffebc8b5110 RBP: 0000000000000268 R08: 0000000000000000 R09: 0000000000000018 R10: 0000000000000012 R11: 0000000000000246 R12: 00007ffebc8b61a0 R13: 0000000001370940 R14: 0000000000000000 R15: 00007ffebc8b61a0