===================================================== WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected 5.12.0-rc8-syzkaller #0 Not tainted ----------------------------------------------------- syz-executor.3/22443 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: ffff8880128ba360 (&new->fa_lock){.+.?}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:1012 [inline] ffff8880128ba360 (&new->fa_lock){.+.?}-{2:2}, at: kill_fasync+0x19b/0x440 fs/fcntl.c:1033 and this task is already holding: ffff888014a06028 (&client->buffer_lock){....}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline] ffff888014a06028 (&client->buffer_lock){....}-{2:2}, at: evdev_pass_values+0xd9/0xaa0 drivers/input/evdev.c:261 which would create a new lock dependency: (&client->buffer_lock){....}-{2:2} -> (&new->fa_lock){.+.?}-{2:2} but this new dependency connects a SOFTIRQ-irq-safe lock: (&evdev->mutex){+.+.}-{3:3} ... which became SOFTIRQ-irq-safe at: lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5511 __mutex_lock_common+0x1bd/0x2e50 kernel/locking/mutex.c:949 __mutex_lock kernel/locking/mutex.c:1096 [inline] mutex_lock_interruptible_nested+0x1a/0x20 kernel/locking/mutex.c:1133 evdev_open_device drivers/input/evdev.c:393 [inline] evdev_open+0x2f6/0x600 drivers/input/evdev.c:487 chrdev_open+0x53b/0x5f0 fs/char_dev.c:414 do_dentry_open+0x7cb/0x1010 fs/open.c:826 do_open fs/namei.c:3367 [inline] path_openat+0x28e6/0x39b0 fs/namei.c:3500 do_filp_open+0x221/0x460 fs/namei.c:3527 do_sys_openat2+0x124/0x460 fs/open.c:1187 do_sys_open fs/open.c:1203 [inline] __do_sys_openat fs/open.c:1219 [inline] __se_sys_openat fs/open.c:1214 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1214 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae to a SOFTIRQ-irq-unsafe lock: (&new->fa_lock){.+.?}-{2:2} ... which became SOFTIRQ-irq-unsafe at: ... lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5511 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1012 [inline] kill_fasync+0x19b/0x440 fs/fcntl.c:1033 sock_wake_async+0x133/0x150 net/socket.c:1312 sk_wake_async+0x17f/0x200 include/net/sock.h:2305 sock_def_readable+0x18a/0x210 net/core/sock.c:2912 dccp_fin net/dccp/input.c:40 [inline] dccp_rcv_close+0x11c/0x1a0 net/dccp/input.c:77 __dccp_rcv_established+0x21c/0x580 net/dccp/input.c:316 dccp_rcv_established+0x29b/0x310 net/dccp/input.c:376 dccp_v6_do_rcv+0x241/0xb90 net/dccp/ipv6.c:611 sk_backlog_rcv include/net/sock.h:1020 [inline] __sk_receive_skb+0x43a/0x9d0 net/core/sock.c:509 dccp_v6_rcv+0xd2b/0x1120 net/dccp/ipv6.c:780 ip6_protocol_deliver_rcu+0x9b5/0x1320 net/ipv6/ip6_input.c:422 ip6_input_finish net/ipv6/ip6_input.c:463 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_input+0x10b/0x190 net/ipv6/ip6_input.c:472 __netif_receive_skb_one_core net/core/dev.c:5384 [inline] __netif_receive_skb+0x1d1/0x500 net/core/dev.c:5498 process_backlog+0x4d8/0x950 net/core/dev.c:6366 __napi_poll+0xba/0x4f0 net/core/dev.c:6913 napi_poll net/core/dev.c:6980 [inline] net_rx_action+0x62c/0xf30 net/core/dev.c:7067 __do_softirq+0x372/0x7a6 kernel/softirq.c:345 do_softirq+0x14d/0x200 kernel/softirq.c:248 __local_bh_enable_ip+0x184/0x1c0 kernel/softirq.c:198 rcu_read_unlock_bh include/linux/rcupdate.h:745 [inline] ip6_finish_output2+0x11b1/0x14f0 net/ipv6/ip6_output.c:118 dst_output include/net/dst.h:448 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_xmit+0xf84/0x18f0 net/ipv6/ip6_output.c:320 inet6_csk_xmit+0x393/0x510 net/ipv6/inet6_connection_sock.c:135 dccp_transmit_skb+0x9dd/0xe50 net/dccp/output.c:138 dccp_terminate_connection net/dccp/proto.c:965 [inline] dccp_close+0x7e6/0x12c0 net/dccp/proto.c:1028 inet_release+0x16e/0x1f0 net/ipv4/af_inet.c:431 __sock_release net/socket.c:599 [inline] sock_close+0xd8/0x260 net/socket.c:1258 __fput+0x352/0x7b0 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x10b/0x1e0 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x26/0x70 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae other info that might help us debug this: Chain exists of: &evdev->mutex --> &client->buffer_lock --> &new->fa_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&new->fa_lock); local_irq_disable(); lock(&evdev->mutex); lock(&client->buffer_lock); lock(&evdev->mutex); *** DEADLOCK *** 7 locks held by syz-executor.3/22443: #0: ffff888144def110 (&evdev->mutex){+.+.}-{3:3}, at: evdev_write+0x234/0x780 drivers/input/evdev.c:513 #1: ffff88801d850230 (&dev->event_lock){-...}-{2:2}, at: input_inject_event+0xb3/0x280 drivers/input/input.c:471 #2: ffffffff8cd10280 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:266 #3: ffffffff8cd10280 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:266 #4: ffffffff8cd10280 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:266 #5: ffff888014a06028 (&client->buffer_lock){....}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline] #5: ffff888014a06028 (&client->buffer_lock){....}-{2:2}, at: evdev_pass_values+0xd9/0xaa0 drivers/input/evdev.c:261 #6: ffffffff8cd10280 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:266 the dependencies between SOFTIRQ-irq-safe lock and the holding lock: -> (&evdev->mutex){+.+.}-{3:3} { HARDIRQ-ON-W at: lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5511 __mutex_lock_common+0x1bd/0x2e50 kernel/locking/mutex.c:949 __mutex_lock kernel/locking/mutex.c:1096 [inline] mutex_lock_interruptible_nested+0x1a/0x20 kernel/locking/mutex.c:1133 evdev_open_device drivers/input/evdev.c:393 [inline] evdev_open+0x2f6/0x600 drivers/input/evdev.c:487 chrdev_open+0x53b/0x5f0 fs/char_dev.c:414 do_dentry_open+0x7cb/0x1010 fs/open.c:826 do_open fs/namei.c:3367 [inline] path_openat+0x28e6/0x39b0 fs/namei.c:3500 do_filp_open+0x221/0x460 fs/namei.c:3527 do_sys_openat2+0x124/0x460 fs/open.c:1187 do_sys_open fs/open.c:1203 [inline] __do_sys_openat fs/open.c:1219 [inline] __se_sys_openat fs/open.c:1214 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1214 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae SOFTIRQ-ON-W at: lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5511 __mutex_lock_common+0x1bd/0x2e50 kernel/locking/mutex.c:949 __mutex_lock kernel/locking/mutex.c:1096 [inline] mutex_lock_interruptible_nested+0x1a/0x20 kernel/locking/mutex.c:1133 evdev_open_device drivers/input/evdev.c:393 [inline] evdev_open+0x2f6/0x600 drivers/input/evdev.c:487 chrdev_open+0x53b/0x5f0 fs/char_dev.c:414 do_dentry_open+0x7cb/0x1010 fs/open.c:826 do_open fs/namei.c:3367 [inline] path_openat+0x28e6/0x39b0 fs/namei.c:3500 do_filp_open+0x221/0x460 fs/namei.c:3527 do_sys_openat2+0x124/0x460 fs/open.c:1187 do_sys_open fs/open.c:1203 [inline] __do_sys_openat fs/open.c:1219 [inline] __se_sys_openat fs/open.c:1214 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1214 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae INITIAL USE at: lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5511 __mutex_lock_common+0x1bd/0x2e50 kernel/locking/mutex.c:949 __mutex_lock kernel/locking/mutex.c:1096 [inline] mutex_lock_interruptible_nested+0x1a/0x20 kernel/locking/mutex.c:1133 evdev_open_device drivers/input/evdev.c:393 [inline] evdev_open+0x2f6/0x600 drivers/input/evdev.c:487 chrdev_open+0x53b/0x5f0 fs/char_dev.c:414 do_dentry_open+0x7cb/0x1010 fs/open.c:826 do_open fs/namei.c:3367 [inline] path_openat+0x28e6/0x39b0 fs/namei.c:3500 do_filp_open+0x221/0x460 fs/namei.c:3527 do_sys_openat2+0x124/0x460 fs/open.c:1187 do_sys_open fs/open.c:1203 [inline] __do_sys_openat fs/open.c:1219 [inline] __se_sys_openat fs/open.c:1214 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1214 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae } ... key at: [] evdev_connect.__key.9+0x0/0x40 ... acquired at: lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5511 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xb3/0x100 kernel/locking/spinlock.c:159 evdev_set_mask drivers/input/evdev.c:980 [inline] evdev_do_ioctl drivers/input/evdev.c:1117 [inline] evdev_ioctl_handler+0x1dd8/0x26a0 drivers/input/evdev.c:1272 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae -> (&client->buffer_lock){....}-{2:2} { INITIAL USE at: lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5511 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xb3/0x100 kernel/locking/spinlock.c:159 evdev_set_mask drivers/input/evdev.c:980 [inline] evdev_do_ioctl drivers/input/evdev.c:1117 [inline] evdev_ioctl_handler+0x1dd8/0x26a0 drivers/input/evdev.c:1272 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae } ... key at: [] evdev_open.__key.23+0x0/0x40 ... acquired at: lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5511 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1012 [inline] kill_fasync+0x19b/0x440 fs/fcntl.c:1033 __pass_event drivers/input/evdev.c:240 [inline] evdev_pass_values+0x58a/0xaa0 drivers/input/evdev.c:278 evdev_events+0x1c5/0x270 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:115 [inline] input_pass_values+0x89c/0x11d0 drivers/input/input.c:145 input_handle_event+0xb99/0x1550 drivers/input/input.c:404 input_inject_event+0x1e8/0x280 drivers/input/input.c:476 evdev_write+0x5f0/0x780 drivers/input/evdev.c:530 vfs_write+0x289/0xc90 fs/read_write.c:603 ksys_write+0x171/0x2a0 fs/read_write.c:658 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae the dependencies between the lock to be acquired and SOFTIRQ-irq-unsafe lock: -> (&new->fa_lock){.+.?}-{2:2} { HARDIRQ-ON-R at: lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5511 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1012 [inline] kill_fasync+0x19b/0x440 fs/fcntl.c:1033 sock_wake_async+0x133/0x150 net/socket.c:1312 sk_wake_async+0x17f/0x200 include/net/sock.h:2305 sock_def_readable+0x18a/0x210 net/core/sock.c:2912 dccp_fin net/dccp/input.c:40 [inline] dccp_rcv_close+0x11c/0x1a0 net/dccp/input.c:77 __dccp_rcv_established+0x21c/0x580 net/dccp/input.c:316 dccp_rcv_established+0x29b/0x310 net/dccp/input.c:376 dccp_v6_do_rcv+0x241/0xb90 net/dccp/ipv6.c:611 sk_backlog_rcv include/net/sock.h:1020 [inline] __sk_receive_skb+0x43a/0x9d0 net/core/sock.c:509 dccp_v6_rcv+0xd2b/0x1120 net/dccp/ipv6.c:780 ip6_protocol_deliver_rcu+0x9b5/0x1320 net/ipv6/ip6_input.c:422 ip6_input_finish net/ipv6/ip6_input.c:463 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_input+0x10b/0x190 net/ipv6/ip6_input.c:472 __netif_receive_skb_one_core net/core/dev.c:5384 [inline] __netif_receive_skb+0x1d1/0x500 net/core/dev.c:5498 process_backlog+0x4d8/0x950 net/core/dev.c:6366 __napi_poll+0xba/0x4f0 net/core/dev.c:6913 napi_poll net/core/dev.c:6980 [inline] net_rx_action+0x62c/0xf30 net/core/dev.c:7067 __do_softirq+0x372/0x7a6 kernel/softirq.c:345 do_softirq+0x14d/0x200 kernel/softirq.c:248 __local_bh_enable_ip+0x184/0x1c0 kernel/softirq.c:198 rcu_read_unlock_bh include/linux/rcupdate.h:745 [inline] ip6_finish_output2+0x11b1/0x14f0 net/ipv6/ip6_output.c:118 dst_output include/net/dst.h:448 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_xmit+0xf84/0x18f0 net/ipv6/ip6_output.c:320 inet6_csk_xmit+0x393/0x510 net/ipv6/inet6_connection_sock.c:135 dccp_transmit_skb+0x9dd/0xe50 net/dccp/output.c:138 dccp_terminate_connection net/dccp/proto.c:965 [inline] dccp_close+0x7e6/0x12c0 net/dccp/proto.c:1028 inet_release+0x16e/0x1f0 net/ipv4/af_inet.c:431 __sock_release net/socket.c:599 [inline] sock_close+0xd8/0x260 net/socket.c:1258 __fput+0x352/0x7b0 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x10b/0x1e0 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x26/0x70 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae IN-SOFTIRQ-R at: lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5511 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1012 [inline] kill_fasync+0x19b/0x440 fs/fcntl.c:1033 sock_wake_async+0x133/0x150 net/socket.c:1312 sk_wake_async+0x17f/0x200 include/net/sock.h:2305 sock_def_readable+0x18a/0x210 net/core/sock.c:2912 dccp_fin net/dccp/input.c:40 [inline] dccp_rcv_close+0x11c/0x1a0 net/dccp/input.c:77 __dccp_rcv_established+0x21c/0x580 net/dccp/input.c:316 dccp_rcv_established+0x29b/0x310 net/dccp/input.c:376 dccp_v6_do_rcv+0x241/0xb90 net/dccp/ipv6.c:611 sk_backlog_rcv include/net/sock.h:1020 [inline] __sk_receive_skb+0x43a/0x9d0 net/core/sock.c:509 dccp_v6_rcv+0xd2b/0x1120 net/dccp/ipv6.c:780 ip6_protocol_deliver_rcu+0x9b5/0x1320 net/ipv6/ip6_input.c:422 ip6_input_finish net/ipv6/ip6_input.c:463 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_input+0x10b/0x190 net/ipv6/ip6_input.c:472 __netif_receive_skb_one_core net/core/dev.c:5384 [inline] __netif_receive_skb+0x1d1/0x500 net/core/dev.c:5498 process_backlog+0x4d8/0x950 net/core/dev.c:6366 __napi_poll+0xba/0x4f0 net/core/dev.c:6913 napi_poll net/core/dev.c:6980 [inline] net_rx_action+0x62c/0xf30 net/core/dev.c:7067 __do_softirq+0x372/0x7a6 kernel/softirq.c:345 do_softirq+0x14d/0x200 kernel/softirq.c:248 __local_bh_enable_ip+0x184/0x1c0 kernel/softirq.c:198 rcu_read_unlock_bh include/linux/rcupdate.h:745 [inline] ip6_finish_output2+0x11b1/0x14f0 net/ipv6/ip6_output.c:118 dst_output include/net/dst.h:448 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_xmit+0xf84/0x18f0 net/ipv6/ip6_output.c:320 inet6_csk_xmit+0x393/0x510 net/ipv6/inet6_connection_sock.c:135 dccp_transmit_skb+0x9dd/0xe50 net/dccp/output.c:138 dccp_terminate_connection net/dccp/proto.c:965 [inline] dccp_close+0x7e6/0x12c0 net/dccp/proto.c:1028 inet_release+0x16e/0x1f0 net/ipv4/af_inet.c:431 __sock_release net/socket.c:599 [inline] sock_close+0xd8/0x260 net/socket.c:1258 __fput+0x352/0x7b0 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x10b/0x1e0 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x26/0x70 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae SOFTIRQ-ON-R at: lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5511 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1012 [inline] kill_fasync+0x19b/0x440 fs/fcntl.c:1033 sock_wake_async+0x133/0x150 net/socket.c:1312 sk_wake_async+0x17f/0x200 include/net/sock.h:2305 sock_def_readable+0x18a/0x210 net/core/sock.c:2912 dccp_fin net/dccp/input.c:40 [inline] dccp_rcv_close+0x11c/0x1a0 net/dccp/input.c:77 __dccp_rcv_established+0x21c/0x580 net/dccp/input.c:316 dccp_rcv_established+0x29b/0x310 net/dccp/input.c:376 dccp_v6_do_rcv+0x241/0xb90 net/dccp/ipv6.c:611 sk_backlog_rcv include/net/sock.h:1020 [inline] __release_sock+0x1db/0x4d0 net/core/sock.c:2550 release_sock+0x5d/0x1c0 net/core/sock.c:3074 dccp_sendmsg+0x9e5/0xc70 net/dccp/proto.c:796 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg net/socket.c:674 [inline] ____sys_sendmsg+0x5a2/0x900 net/socket.c:2350 ___sys_sendmsg net/socket.c:2404 [inline] __sys_sendmmsg+0x500/0x790 net/socket.c:2490 __do_sys_sendmmsg net/socket.c:2519 [inline] __se_sys_sendmmsg net/socket.c:2516 [inline] __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2516 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae INITIAL USE at: lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5511 __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline] _raw_write_lock_irq+0xae/0xf0 kernel/locking/spinlock.c:311 fasync_remove_entry+0xff/0x1d0 fs/fcntl.c:890 sock_fasync+0x86/0xf0 net/socket.c:1283 __fput+0x65b/0x7b0 fs/file_table.c:277 task_work_run+0x146/0x1c0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x10b/0x1e0 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x26/0x70 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae INITIAL READ USE at: lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5511 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1012 [inline] kill_fasync+0x19b/0x440 fs/fcntl.c:1033 sock_wake_async+0x133/0x150 net/socket.c:1312 sk_wake_async+0x17f/0x200 include/net/sock.h:2305 sock_def_readable+0x18a/0x210 net/core/sock.c:2912 dccp_fin net/dccp/input.c:40 [inline] dccp_rcv_close+0x11c/0x1a0 net/dccp/input.c:77 __dccp_rcv_established+0x21c/0x580 net/dccp/input.c:316 dccp_rcv_established+0x29b/0x310 net/dccp/input.c:376 dccp_v6_do_rcv+0x241/0xb90 net/dccp/ipv6.c:611 sk_backlog_rcv include/net/sock.h:1020 [inline] __sk_receive_skb+0x43a/0x9d0 net/core/sock.c:509 dccp_v6_rcv+0xd2b/0x1120 net/dccp/ipv6.c:780 ip6_protocol_deliver_rcu+0x9b5/0x1320 net/ipv6/ip6_input.c:422 ip6_input_finish net/ipv6/ip6_input.c:463 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_input+0x10b/0x190 net/ipv6/ip6_input.c:472 __netif_receive_skb_one_core net/core/dev.c:5384 [inline] __netif_receive_skb+0x1d1/0x500 net/core/dev.c:5498 process_backlog+0x4d8/0x950 net/core/dev.c:6366 __napi_poll+0xba/0x4f0 net/core/dev.c:6913 napi_poll net/core/dev.c:6980 [inline] net_rx_action+0x62c/0xf30 net/core/dev.c:7067 __do_softirq+0x372/0x7a6 kernel/softirq.c:345 do_softirq+0x14d/0x200 kernel/softirq.c:248 __local_bh_enable_ip+0x184/0x1c0 kernel/softirq.c:198 rcu_read_unlock_bh include/linux/rcupdate.h:745 [inline] ip6_finish_output2+0x11b1/0x14f0 net/ipv6/ip6_output.c:118 dst_output include/net/dst.h:448 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_xmit+0xf84/0x18f0 net/ipv6/ip6_output.c:320 inet6_csk_xmit+0x393/0x510 net/ipv6/inet6_connection_sock.c:135 dccp_transmit_skb+0x9dd/0xe50 net/dccp/output.c:138 dccp_terminate_connection net/dccp/proto.c:965 [inline] dccp_close+0x7e6/0x12c0 net/dccp/proto.c:1028 inet_release+0x16e/0x1f0 net/ipv4/af_inet.c:431 __sock_release net/socket.c:599 [inline] sock_close+0xd8/0x260 net/socket.c:1258 __fput+0x352/0x7b0 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x10b/0x1e0 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x26/0x70 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae } ... key at: [] fasync_insert_entry.__key+0x0/0x40 ... acquired at: lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5511 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1012 [inline] kill_fasync+0x19b/0x440 fs/fcntl.c:1033 __pass_event drivers/input/evdev.c:240 [inline] evdev_pass_values+0x58a/0xaa0 drivers/input/evdev.c:278 evdev_events+0x1c5/0x270 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:115 [inline] input_pass_values+0x89c/0x11d0 drivers/input/input.c:145 input_handle_event+0xb99/0x1550 drivers/input/input.c:404 input_inject_event+0x1e8/0x280 drivers/input/input.c:476 evdev_write+0x5f0/0x780 drivers/input/evdev.c:530 vfs_write+0x289/0xc90 fs/read_write.c:603 ksys_write+0x171/0x2a0 fs/read_write.c:658 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae stack backtrace: CPU: 1 PID: 22443 Comm: syz-executor.3 Not tainted 5.12.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x202/0x31e lib/dump_stack.c:120 print_bad_irq_dependency kernel/locking/lockdep.c:2461 [inline] check_irq_usage kernel/locking/lockdep.c:2690 [inline] check_prev_add kernel/locking/lockdep.c:2941 [inline] check_prevs_add+0x4da1/0x5a90 kernel/locking/lockdep.c:3060 validate_chain kernel/locking/lockdep.c:3675 [inline] __lock_acquire+0x4307/0x6040 kernel/locking/lockdep.c:4901 lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5511 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1012 [inline] kill_fasync+0x19b/0x440 fs/fcntl.c:1033 __pass_event drivers/input/evdev.c:240 [inline] evdev_pass_values+0x58a/0xaa0 drivers/input/evdev.c:278 evdev_events+0x1c5/0x270 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:115 [inline] input_pass_values+0x89c/0x11d0 drivers/input/input.c:145 input_handle_event+0xb99/0x1550 drivers/input/input.c:404 input_inject_event+0x1e8/0x280 drivers/input/input.c:476 evdev_write+0x5f0/0x780 drivers/input/evdev.c:530 vfs_write+0x289/0xc90 fs/read_write.c:603 ksys_write+0x171/0x2a0 fs/read_write.c:658 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbe6db35188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 00000000000002b8 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 00000000004bfbb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffdd43ded4f R14: 00007fbe6db35300 R15: 0000000000022000