====================================================== WARNING: possible circular locking dependency detected 6.2.0-rc8-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/9295 is trying to acquire lock: ffff888081e7b100 (&rm->m_rs_lock){..-.}-{2:2}, at: rds_message_purge net/rds/message.c:138 [inline] ffff888081e7b100 (&rm->m_rs_lock){..-.}-{2:2}, at: rds_message_put+0x1dd/0xc00 net/rds/message.c:180 but task is already holding lock: ffff888086a1acf0 (&rs->rs_recv_lock){...-}-{2:2}, at: rds_clear_recv_queue+0x33/0x350 net/rds/recv.c:761 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&rs->rs_recv_lock){...-}-{2:2}: __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0x49/0x90 kernel/locking/spinlock.c:236 rds_wake_sk_sleep+0x23/0xe0 net/rds/af_rds.c:109 rds_send_remove_from_sock+0xb9/0x9e0 net/rds/send.c:634 rds_send_path_drop_acked+0x2f3/0x3d0 net/rds/send.c:710 rds_tcp_write_space+0x1b5/0x690 net/rds/tcp_send.c:198 tcp_new_space net/ipv4/tcp_input.c:5483 [inline] tcp_check_space+0x11b/0x810 net/ipv4/tcp_input.c:5502 tcp_data_snd_check net/ipv4/tcp_input.c:5511 [inline] tcp_rcv_established+0x93e/0x2230 net/ipv4/tcp_input.c:6019 tcp_v4_do_rcv+0x670/0x9b0 net/ipv4/tcp_ipv4.c:1721 sk_backlog_rcv include/net/sock.h:1113 [inline] __release_sock+0x133/0x3b0 net/core/sock.c:2930 release_sock+0x58/0x1b0 net/core/sock.c:3486 rds_send_xmit+0xafc/0x2540 net/rds/send.c:422 rds_sendmsg+0x27d3/0x3080 net/rds/send.c:1381 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xd3/0x120 net/socket.c:734 ____sys_sendmsg+0x712/0x8c0 net/socket.c:2476 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2530 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2559 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (&rm->m_rs_lock){..-.}-{2:2}: check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain kernel/locking/lockdep.c:3831 [inline] __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055 lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162 rds_message_purge net/rds/message.c:138 [inline] rds_message_put+0x1dd/0xc00 net/rds/message.c:180 rds_inc_put net/rds/recv.c:82 [inline] rds_inc_put+0x13e/0x1a0 net/rds/recv.c:76 rds_clear_recv_queue+0x14b/0x350 net/rds/recv.c:767 rds_release+0xd8/0x3c0 net/rds/af_rds.c:73 __sock_release+0xcd/0x280 net/socket.c:650 sock_close+0x1c/0x20 net/socket.c:1365 __fput+0x27c/0xa90 fs/file_table.c:320 task_work_run+0x16f/0x270 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rs->rs_recv_lock); lock(&rm->m_rs_lock); lock(&rs->rs_recv_lock); lock(&rm->m_rs_lock); *** DEADLOCK *** 2 locks held by syz-executor.0/9295: #0: ffff888073390810 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #0: ffff888073390810 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release+0x86/0x280 net/socket.c:649 #1: ffff888086a1acf0 (&rs->rs_recv_lock){...-}-{2:2}, at: rds_clear_recv_queue+0x33/0x350 net/rds/recv.c:761 stack backtrace: CPU: 0 PID: 9295 Comm: syz-executor.0 Not tainted 6.2.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2177 check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain kernel/locking/lockdep.c:3831 [inline] __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055 lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162 rds_message_purge net/rds/message.c:138 [inline] rds_message_put+0x1dd/0xc00 net/rds/message.c:180 rds_inc_put net/rds/recv.c:82 [inline] rds_inc_put+0x13e/0x1a0 net/rds/recv.c:76 rds_clear_recv_queue+0x14b/0x350 net/rds/recv.c:767 rds_release+0xd8/0x3c0 net/rds/af_rds.c:73 __sock_release+0xcd/0x280 net/socket.c:650 sock_close+0x1c/0x20 net/socket.c:1365 __fput+0x27c/0xa90 fs/file_table.c:320 task_work_run+0x16f/0x270 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7ff8c6e3dfab Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffde5bdd570 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007ff8c6e3dfab RDX: 00007ff8c6a004a0 RSI: ffffffffffffffff RDI: 0000000000000003 RBP: 00007ff8c6fad980 R08: 0000000000000000 R09: 00007ff8c6a00000 R10: 00007ff8c6a004a8 R11: 0000000000000293 R12: 00000000001424ed R13: 00007ffde5bdd670 R14: 00007ff8c6fabf80 R15: 0000000000000032