possible deadlock in kill

possible deadlock in kill_fasync
Status: upstream: reported C repro on 2020/10/03 10:29
Reported-by: syzbot+3e12e14ee01b675e1af2@syzkaller.appspotmail.com
First crash: 153d, last: 8h20m

Cause bisection: introduced by (bisect log) :
commit e918188611f073063415f40fae568fa4d86d9044
Author: Boqun Feng <boqun.feng@gmail.com>
Date: Fri Aug 7 07:42:20 2020 +0000

locking: More accurate annotations for read_lock()

Crash: possible deadlock in kill_fasync (log)
Repro: C syz .config

Sample crash report:

netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
========================================================
WARNING: possible irq lock inversion dependency detected
5.10.0-syzkaller #0 Not tainted
--------------------------------------------------------
syz-executor056/8497 just changed the state of lock:
ffff8880155b50c0 (&new->fa_lock){.+..}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:1004 [inline]
ffff8880155b50c0 (&new->fa_lock){.+..}-{2:2}, at: kill_fasync fs/fcntl.c:1025 [inline]
ffff8880155b50c0 (&new->fa_lock){.+..}-{2:2}, at: kill_fasync+0x1a1/0x4c0 fs/fcntl.c:1018
but this lock was taken by another, HARDIRQ-safe lock in the past:
 (&dev->event_lock){-.-.}-{2:2}


and interrupts could create inverse lock ordering between them.


other info that might help us debug this:
Chain exists of:
  &dev->event_lock --> &client->buffer_lock --> &new->fa_lock

 Possible interrupt unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&new->fa_lock);
                               local_irq_disable();
                               lock(&dev->event_lock);
                               lock(&client->buffer_lock);
  <Interrupt>
    lock(&dev->event_lock);

 *** DEADLOCK ***

3 locks held by syz-executor056/8497:
 #0: ffffffff8b793de0 (rcu_read_lock){....}-{1:2}, at: sock_def_error_report+0x0/0x580 include/net/sock.h:2279
 #1: ffffffff8b793de0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_release include/linux/rcupdate.h:258 [inline]
 #1: ffffffff8b793de0 (rcu_read_lock){....}-{1:2}, at: rcu_read_unlock include/linux/rcupdate.h:696 [inline]
 #1: ffffffff8b793de0 (rcu_read_lock){....}-{1:2}, at: sock_def_error_report+0x225/0x580 net/core/sock.c:2892
 #2: ffffffff8b793de0 (rcu_read_lock){....}-{1:2}, at: kill_fasync+0x3d/0x4c0 fs/fcntl.c:1023

the shortest dependencies between 2nd lock and 1st lock:
  -> (&dev->event_lock){-.-.}-{2:2} {
     IN-HARDIRQ-W at:
                        lock_acquire kernel/locking/lockdep.c:5437 [inline]
                        lock_acquire+0x29d/0x750 kernel/locking/lockdep.c:5402
                        __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
                        _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159
                        input_event drivers/input/input.c:445 [inline]
                        input_event+0x7b/0xb0 drivers/input/input.c:438
                        input_report_key include/linux/input.h:425 [inline]
                        psmouse_report_standard_buttons+0x2c/0x80 drivers/input/mouse/psmouse-base.c:123
                        psmouse_report_standard_packet drivers/input/mouse/psmouse-base.c:141 [inline]
                        psmouse_process_byte+0x1df/0x8a0 drivers/input/mouse/psmouse-base.c:232
                        psmouse_handle_byte+0x41/0x1b0 drivers/input/mouse/psmouse-base.c:274
                        psmouse_interrupt+0x301/0xf40 drivers/input/mouse/psmouse-base.c:426
                        serio_interrupt+0x88/0x150 drivers/input/serio/serio.c:1002
                        i8042_interrupt+0x3ba/0x710 drivers/input/serio/i8042.c:602
                        __handle_irq_event_percpu+0x303/0x950 kernel/irq/handle.c:156
                        handle_irq_event_percpu+0x76/0x170 kernel/irq/handle.c:196
                        handle_irq_event+0xa1/0x130 kernel/irq/handle.c:213
                        handle_edge_irq+0x25f/0xd00 kernel/irq/chip.c:819
                        run_irq_on_irqstack_cond arch/x86/include/asm/irq_stack.h:103 [inline]
                        handle_irq arch/x86/kernel/irq.c:230 [inline]
                        __common_interrupt arch/x86/kernel/irq.c:249 [inline]
                        common_interrupt+0xa5/0x220 arch/x86/kernel/irq.c:239
                        asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:619
                        native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline]
                        arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline]
                        __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
                        _raw_spin_unlock_irqrestore+0x25/0x50 kernel/locking/spinlock.c:191
                        __debug_check_no_obj_freed lib/debugobjects.c:997 [inline]
                        debug_check_no_obj_freed+0x20c/0x430 lib/debugobjects.c:1018
                        slab_free_hook mm/slub.c:1539 [inline]
                        slab_free_freelist_hook+0x107/0x150 mm/slub.c:1580
                        slab_free mm/slub.c:3143 [inline]
                        kmem_cache_free+0x82/0x360 mm/slub.c:3159
                        __put_task_struct+0x267/0x3f0 kernel/fork.c:742
                        put_task_struct include/linux/sched/task.h:111 [inline]
                        delayed_put_task_struct+0x1f6/0x350 kernel/exit.c:172
                        rcu_do_batch kernel/rcu/tree.c:2489 [inline]
                        rcu_core+0x75d/0xf80 kernel/rcu/tree.c:2723
                        __do_softirq+0x2bc/0xa77 kernel/softirq.c:343
                        asm_call_irq_on_stack+0xf/0x20
                        __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
                        run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
                        do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
                        invoke_softirq kernel/softirq.c:226 [inline]
                        __irq_exit_rcu+0x17f/0x200 kernel/softirq.c:420
                        irq_exit_rcu+0x5/0x20 kernel/softirq.c:432
                        sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096
                        asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
                        native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline]
                        arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline]
                        console_unlock+0x807/0xc00 kernel/printk/printk.c:2560
                        vprintk_emit+0x198/0x400 kernel/printk/printk.c:2074
                        vprintk_func+0x8d/0x1e0 kernel/printk/printk_safe.c:393
                        printk+0xba/0xed kernel/printk/printk.c:2122
                        usb_register_driver.cold+0x5a/0x69 drivers/usb/core/driver.c:1073
                        do_one_initcall+0x103/0x690 init/main.c:1217
                        do_initcall_level init/main.c:1290 [inline]
                        do_initcalls init/main.c:1306 [inline]
                        do_basic_setup init/main.c:1326 [inline]
                        kernel_init_freeable+0x600/0x684 init/main.c:1532
                        kernel_init+0xe/0x1e0 init/main.c:1415
                        ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
     IN-SOFTIRQ-W at:
                        lock_acquire kernel/locking/lockdep.c:5437 [inline]
                        lock_acquire+0x29d/0x750 kernel/locking/lockdep.c:5402
                        __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
                        _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159
                        input_event drivers/input/input.c:445 [inline]
                        input_event+0x7b/0xb0 drivers/input/input.c:438
                        input_report_key include/linux/input.h:425 [inline]
                        psmouse_report_standard_buttons+0x2c/0x80 drivers/input/mouse/psmouse-base.c:123
                        psmouse_report_standard_packet drivers/input/mouse/psmouse-base.c:141 [inline]
                        psmouse_process_byte+0x1df/0x8a0 drivers/input/mouse/psmouse-base.c:232
                        psmouse_handle_byte+0x41/0x1b0 drivers/input/mouse/psmouse-base.c:274
                        psmouse_interrupt+0x301/0xf40 drivers/input/mouse/psmouse-base.c:426
                        serio_interrupt+0x88/0x150 drivers/input/serio/serio.c:1002
                        i8042_interrupt+0x3ba/0x710 drivers/input/serio/i8042.c:602
                        __handle_irq_event_percpu+0x303/0x950 kernel/irq/handle.c:156
                        handle_irq_event_percpu+0x76/0x170 kernel/irq/handle.c:196
                        handle_irq_event+0xa1/0x130 kernel/irq/handle.c:213
                        handle_edge_irq+0x25f/0xd00 kernel/irq/chip.c:819
                        run_irq_on_irqstack_cond arch/x86/include/asm/irq_stack.h:103 [inline]
                        handle_irq arch/x86/kernel/irq.c:230 [inline]
                        __common_interrupt arch/x86/kernel/irq.c:249 [inline]
                        common_interrupt+0xa5/0x220 arch/x86/kernel/irq.c:239
                        asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:619
                        native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline]
                        arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline]
                        __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
                        _raw_spin_unlock_irqrestore+0x25/0x50 kernel/locking/spinlock.c:191
                        __debug_check_no_obj_freed lib/debugobjects.c:997 [inline]
                        debug_check_no_obj_freed+0x20c/0x430 lib/debugobjects.c:1018
                        slab_free_hook mm/slub.c:1539 [inline]
                        slab_free_freelist_hook+0x107/0x150 mm/slub.c:1580
                        slab_free mm/slub.c:3143 [inline]
                        kmem_cache_free+0x82/0x360 mm/slub.c:3159
                        __put_task_struct+0x267/0x3f0 kernel/fork.c:742
                        put_task_struct include/linux/sched/task.h:111 [inline]
                        delayed_put_task_struct+0x1f6/0x350 kernel/exit.c:172
                        rcu_do_batch kernel/rcu/tree.c:2489 [inline]
                        rcu_core+0x75d/0xf80 kernel/rcu/tree.c:2723
                        __do_softirq+0x2bc/0xa77 kernel/softirq.c:343
                        asm_call_irq_on_stack+0xf/0x20
                        __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
                        run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
                        do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
                        invoke_softirq kernel/softirq.c:226 [inline]
                        __irq_exit_rcu+0x17f/0x200 kernel/softirq.c:420
                        irq_exit_rcu+0x5/0x20 kernel/softirq.c:432
                        sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096
                        asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
                        native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline]
                        arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline]
                        console_unlock+0x807/0xc00 kernel/printk/printk.c:2560
                        vprintk_emit+0x198/0x400 kernel/printk/printk.c:2074
                        vprintk_func+0x8d/0x1e0 kernel/printk/printk_safe.c:393
                        printk+0xba/0xed kernel/printk/printk.c:2122
                        usb_register_driver.cold+0x5a/0x69 drivers/usb/core/driver.c:1073
                        do_one_initcall+0x103/0x690 init/main.c:1217
                        do_initcall_level init/main.c:1290 [inline]
                        do_initcalls init/main.c:1306 [inline]
                        do_basic_setup init/main.c:1326 [inline]
                        kernel_init_freeable+0x600/0x684 init/main.c:1532
                        kernel_init+0xe/0x1e0 init/main.c:1415
                        ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
     INITIAL USE at:
                       lock_acquire kernel/locking/lockdep.c:5437 [inline]
                       lock_acquire+0x29d/0x750 kernel/locking/lockdep.c:5402
                       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
                       _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159
                       input_inject_event+0xa6/0x390 drivers/input/input.c:471
                       __led_set_brightness drivers/leds/led-core.c:48 [inline]
                       led_set_brightness_nopm drivers/leds/led-core.c:275 [inline]
                       led_set_brightness_nosleep+0xe6/0x1a0 drivers/leds/led-core.c:292
                       led_set_brightness+0x134/0x170 drivers/leds/led-core.c:267
                       led_trigger_event drivers/leds/led-triggers.c:387 [inline]
                       led_trigger_event+0x70/0xd0 drivers/leds/led-triggers.c:377
                       kbd_led_trigger_activate+0xfa/0x130 drivers/tty/vt/keyboard.c:1017
                       led_trigger_set+0x61e/0xbd0 drivers/leds/led-triggers.c:195
                       led_trigger_set_default drivers/leds/led-triggers.c:259 [inline]
                       led_trigger_set_default+0x1a6/0x230 drivers/leds/led-triggers.c:246
                       led_classdev_register_ext+0x5d6/0x7f0 drivers/leds/led-class.c:417
                       led_classdev_register include/linux/leds.h:190 [inline]
                       input_leds_connect+0x3fb/0x740 drivers/input/input-leds.c:139
                       input_attach_handler+0x180/0x1f0 drivers/input/input.c:1035
                       input_register_device.cold+0x10a/0x35f drivers/input/input.c:2335
                       atkbd_connect+0x83b/0xb50 drivers/input/keyboard/atkbd.c:1293
                       serio_connect_driver drivers/input/serio/serio.c:47 [inline]
                       serio_driver_probe+0x72/0xa0 drivers/input/serio/serio.c:778
                       really_probe+0x2b1/0xe40 drivers/base/dd.c:561
                       driver_probe_device+0x285/0x3f0 drivers/base/dd.c:745
                       device_driver_attach+0x27d/0x2f0 drivers/base/dd.c:1020
                       __driver_attach+0x15b/0x2f0 drivers/base/dd.c:1097
                       bus_for_each_dev+0x147/0x1d0 drivers/base/bus.c:305
                       serio_attach_driver drivers/input/serio/serio.c:808 [inline]
                       serio_handle_event+0x5f6/0xa30 drivers/input/serio/serio.c:227
                       process_one_work+0x98d/0x1630 kernel/workqueue.c:2275
                       worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
                       kthread+0x3b1/0x4a0 kernel/kthread.c:292
                       ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
   }
   ... key      at: [<ffffffff903501e0>] __key.8+0x0/0x40
   ... acquired at:
   __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
   _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
   spin_lock include/linux/spinlock.h:354 [inline]
   evdev_pass_values.part.0+0xf6/0x970 drivers/input/evdev.c:261
   evdev_pass_values drivers/input/evdev.c:253 [inline]
   evdev_events+0x328/0x490 drivers/input/evdev.c:306
   input_to_handler+0x2a0/0x4c0 drivers/input/input.c:115
   input_pass_values.part.0+0x2e4/0x760 drivers/input/input.c:145
   input_pass_values drivers/input/input.c:134 [inline]
   input_handle_event+0x39b/0x1470 drivers/input/input.c:404
   input_inject_event+0x36a/0x390 drivers/input/input.c:476
   evdev_write+0x463/0x780 drivers/input/evdev.c:530
   vfs_write+0x28e/0xa80 fs/read_write.c:603
   ksys_write+0x1ee/0x250 fs/read_write.c:658
   do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
   entry_SYSCALL_64_after_hwframe+0x44/0xa9

 -> (&client->buffer_lock){....}-{2:2} {
    INITIAL USE at:
                     lock_acquire kernel/locking/lockdep.c:5437 [inline]
                     lock_acquire+0x29d/0x750 kernel/locking/lockdep.c:5402
                     __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
                     _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
                     spin_lock include/linux/spinlock.h:354 [inline]
                     evdev_pass_values.part.0+0xf6/0x970 drivers/input/evdev.c:261
                     evdev_pass_values drivers/input/evdev.c:253 [inline]
                     evdev_events+0x328/0x490 drivers/input/evdev.c:306
                     input_to_handler+0x2a0/0x4c0 drivers/input/input.c:115
                     input_pass_values.part.0+0x2e4/0x760 drivers/input/input.c:145
                     input_pass_values drivers/input/input.c:134 [inline]
                     input_handle_event+0x39b/0x1470 drivers/input/input.c:404
                     input_inject_event+0x36a/0x390 drivers/input/input.c:476
                     evdev_write+0x463/0x780 drivers/input/evdev.c:530
                     vfs_write+0x28e/0xa80 fs/read_write.c:603
                     ksys_write+0x1ee/0x250 fs/read_write.c:658
                     do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
                     entry_SYSCALL_64_after_hwframe+0x44/0xa9
  }
  ... key      at: [<ffffffff90350660>] __key.4+0x0/0x40
  ... acquired at:
   __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
   _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
   kill_fasync_rcu fs/fcntl.c:1004 [inline]
   kill_fasync fs/fcntl.c:1025 [inline]
   kill_fasync+0x1a1/0x4c0 fs/fcntl.c:1018
   __pass_event drivers/input/evdev.c:240 [inline]
   evdev_pass_values.part.0+0x64e/0x970 drivers/input/evdev.c:278
   evdev_pass_values drivers/input/evdev.c:253 [inline]
   evdev_events+0x328/0x490 drivers/input/evdev.c:306
   input_to_handler+0x2a0/0x4c0 drivers/input/input.c:115
   input_pass_values.part.0+0x2e4/0x760 drivers/input/input.c:145
   input_pass_values drivers/input/input.c:134 [inline]
   input_handle_event+0x39b/0x1470 drivers/input/input.c:404
   input_inject_event+0x36a/0x390 drivers/input/input.c:476
   evdev_write+0x463/0x780 drivers/input/evdev.c:530
   vfs_write+0x28e/0xa80 fs/read_write.c:603
   ksys_write+0x1ee/0x250 fs/read_write.c:658
   do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
   entry_SYSCALL_64_after_hwframe+0x44/0xa9

-> (&new->fa_lock){.+..}-{2:2} {
   HARDIRQ-ON-R at:
                    lock_acquire kernel/locking/lockdep.c:5437 [inline]
                    lock_acquire+0x29d/0x750 kernel/locking/lockdep.c:5402
                    __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
                    _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
                    kill_fasync_rcu fs/fcntl.c:1004 [inline]
                    kill_fasync fs/fcntl.c:1025 [inline]
                    kill_fasync+0x1a1/0x4c0 fs/fcntl.c:1018
                    sock_wake_async+0xd2/0x160 net/socket.c:1310
                    sk_wake_async include/net/sock.h:2279 [inline]
                    sk_wake_async include/net/sock.h:2275 [inline]
                    sock_def_error_report+0x361/0x580 net/core/sock.c:2891
                    sock_queue_err_skb+0x37b/0x750 net/core/skbuff.c:4542
                    __skb_complete_tx_timestamp+0x308/0x420 net/core/skbuff.c:4637
                    __skb_tstamp_tx+0x402/0x770 net/core/skbuff.c:4725
                    __dev_queue_xmit+0x1eb2/0x2ec0 net/core/dev.c:4086
                    packet_snd net/packet/af_packet.c:3006 [inline]
                    packet_sendmsg+0x241f/0x5310 net/packet/af_packet.c:3031
                    sock_sendmsg_nosec net/socket.c:652 [inline]
                    sock_sendmsg+0xcf/0x120 net/socket.c:672
                    ____sys_sendmsg+0x331/0x810 net/socket.c:2345
                    ___sys_sendmsg+0xf3/0x170 net/socket.c:2399
                    __sys_sendmmsg+0x195/0x470 net/socket.c:2489
                    __do_sys_sendmmsg net/socket.c:2518 [inline]
                    __se_sys_sendmmsg net/socket.c:2515 [inline]
                    __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2515
                    do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
                    entry_SYSCALL_64_after_hwframe+0x44/0xa9
   INITIAL READ USE at:
                        lock_acquire kernel/locking/lockdep.c:5437 [inline]
                        lock_acquire+0x29d/0x750 kernel/locking/lockdep.c:5402
                        __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
                        _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
                        kill_fasync_rcu fs/fcntl.c:1004 [inline]
                        kill_fasync fs/fcntl.c:1025 [inline]
                        kill_fasync+0x1a1/0x4c0 fs/fcntl.c:1018
                        __pass_event drivers/input/evdev.c:240 [inline]
                        evdev_pass_values.part.0+0x64e/0x970 drivers/input/evdev.c:278
                        evdev_pass_values drivers/input/evdev.c:253 [inline]
                        evdev_events+0x328/0x490 drivers/input/evdev.c:306
                        input_to_handler+0x2a0/0x4c0 drivers/input/input.c:115
                        input_pass_values.part.0+0x2e4/0x760 drivers/input/input.c:145
                        input_pass_values drivers/input/input.c:134 [inline]
                        input_handle_event+0x39b/0x1470 drivers/input/input.c:404
                        input_inject_event+0x36a/0x390 drivers/input/input.c:476
                        evdev_write+0x463/0x780 drivers/input/evdev.c:530
                        vfs_write+0x28e/0xa80 fs/read_write.c:603
                        ksys_write+0x1ee/0x250 fs/read_write.c:658
                        do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
                        entry_SYSCALL_64_after_hwframe+0x44/0xa9
 }
 ... key      at: [<ffffffff8f88c980>] __key.0+0x0/0x40
 ... acquired at:
   mark_usage kernel/locking/lockdep.c:4312 [inline]
   __lock_acquire+0x1219/0x54b0 kernel/locking/lockdep.c:4786
   lock_acquire kernel/locking/lockdep.c:5437 [inline]
   lock_acquire+0x29d/0x750 kernel/locking/lockdep.c:5402
   __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
   _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
   kill_fasync_rcu fs/fcntl.c:1004 [inline]
   kill_fasync fs/fcntl.c:1025 [inline]
   kill_fasync+0x1a1/0x4c0 fs/fcntl.c:1018
   sock_wake_async+0xd2/0x160 net/socket.c:1310
   sk_wake_async include/net/sock.h:2279 [inline]
   sk_wake_async include/net/sock.h:2275 [inline]
   sock_def_error_report+0x361/0x580 net/core/sock.c:2891
   sock_queue_err_skb+0x37b/0x750 net/core/skbuff.c:4542
   __skb_complete_tx_timestamp+0x308/0x420 net/core/skbuff.c:4637
   __skb_tstamp_tx+0x402/0x770 net/core/skbuff.c:4725
   __dev_queue_xmit+0x1eb2/0x2ec0 net/core/dev.c:4086
   packet_snd net/packet/af_packet.c:3006 [inline]
   packet_sendmsg+0x241f/0x5310 net/packet/af_packet.c:3031
   sock_sendmsg_nosec net/socket.c:652 [inline]
   sock_sendmsg+0xcf/0x120 net/socket.c:672
   ____sys_sendmsg+0x331/0x810 net/socket.c:2345
   ___sys_sendmsg+0xf3/0x170 net/socket.c:2399
   __sys_sendmmsg+0x195/0x470 net/socket.c:2489
   __do_sys_sendmmsg net/socket.c:2518 [inline]
   __se_sys_sendmmsg net/socket.c:2515 [inline]
   __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2515
   do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
   entry_SYSCALL_64_after_hwframe+0x44/0xa9


stack backtrace:
CPU: 0 PID: 8497 Comm: syz-executor056 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 print_irq_inversion_bug kernel/locking/lockdep.c:3740 [inline]
 check_usage_backwards kernel/locking/lockdep.c:3884 [inline]
 mark_lock_irq kernel/locking/lockdep.c:3974 [inline]
 mark_lock.cold+0x1a/0x73 kernel/locking/lockdep.c:4411
 mark_usage kernel/locking/lockdep.c:4312 [inline]
 __lock_acquire+0x1219/0x54b0 kernel/locking/lockdep.c:4786
 lock_acquire kernel/locking/lockdep.c:5437 [inline]
 lock_acquire+0x29d/0x750 kernel/locking/lockdep.c:5402
 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
 _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
 kill_fasync_rcu fs/fcntl.c:1004 [inline]
 kill_fasync fs/fcntl.c:1025 [inline]
 kill_fasync+0x1a1/0x4c0 fs/fcntl.c:1018
 sock_wake_async+0xd2/0x160 net/socket.c:1310
 sk_wake_async include/net/sock.h:2279 [inline]
 sk_wake_async include/net/sock.h:2275 [inline]
 sock_def_error_report+0x361/0x580 net/core/sock.c:2891
 sock_queue_err_skb+0x37b/0x750 net/core/skbuff.c:4542
 __skb_complete_tx_timestamp+0x308/0x420 net/core/skbuff.c:4637
 __skb_tstamp_tx+0x402/0x770 net/core/skbuff.c:4725
 __dev_queue_xmit+0x1eb2/0x2ec0 net/core/dev.c:4086
 packet_snd net/packet/af_packet.c:3006 [inline]
 packet_sendmsg+0x241f/0x5310 net/packet/af_packet.c:3031
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x331/0x810 net/socket.c:2345
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399
 __sys_sendmmsg+0x195/0x470 net/socket.c:2489
 __do_sys_sendmmsg net/socket.c:2518 [inline]
 __se_sys_sendmmsg net/socket.c:2515 [inline]
 __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2515
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4473f9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 0b d2 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffe5d61bd48 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00000000004aae61 RCX: 00000000004473f9
RDX: 000000000400004e RSI: 0000000020000d00 RDI: 0000000000000005
RBP: 00007ffe5d61bd50 R08: 0000000001bbbbbb R09: 0000000001bbbbbb
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe5d61bd60
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Crashes (172):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kasan-gce	2020/12/26 21:17	upstream	40f78232	821e0b09	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/11/17 20:31	linux-next	7c8ca812	bd2a760b	.config	log	report	syz	C
ci-upstream-kasan-gce	2021/03/01 21:30	upstream	fe07bfda	183afb6c	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce	2021/03/01 20:04	upstream	fe07bfda	183afb6c	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-selinux-root	2021/02/27 08:27	upstream	3fb6d0e0	4c37c133	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-selinux-root	2021/02/26 16:48	upstream	2c87f7a3	4c37c133	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce	2021/02/26 15:19	upstream	2c87f7a3	4c37c133	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-smack-root	2021/02/26 11:12	upstream	2c87f7a3	76f7fc95	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-selinux-root	2021/02/25 16:24	upstream	29c395c7	76f7fc95	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-selinux-root	2021/02/25 00:41	upstream	719bbd4a	fcc6d71b	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce	2021/02/24 23:21	upstream	719bbd4a	fcc6d71b	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce	2021/02/24 05:43	upstream	c03c21ba	fcc6d71b	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce	2021/02/21 03:17	upstream	f40ddce8	3e5ed8b4	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce	2021/02/13 11:21	upstream	c6d8570e	98682e5e	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce	2021/02/12 20:46	upstream	dcc0b490	98682e5e	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce	2021/02/11 22:56	upstream	291009f6	a5f86b15	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce	2021/02/07 22:39	upstream	b75dba7f	2ce644fc	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-smack-root	2021/02/07 10:39	upstream	825b5991	2ce644fc	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce	2021/02/06 03:47	upstream	1e0d27fc	23a562df	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-smack-root	2021/02/05 15:04	upstream	dd86e7fa	23a562df	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce	2021/02/05 13:56	upstream	dd86e7fa	23a562df	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-smack-root	2021/02/04 13:49	upstream	61556703	42b90a7c	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce	2021/02/04 12:47	upstream	61556703	42b90a7c	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-smack-root	2021/02/03 20:43	upstream	3afe9076	624dad51	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-smack-root	2021/02/03 02:19	upstream	3aaf0a27	624dad51	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce	2021/02/02 10:11	upstream	88bb507a	19e09687	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-smack-root	2021/02/01 06:22	upstream	1048ba83	fc9fd31e	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce	2021/01/29 23:10	upstream	bec4c296	fc9fd31e	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-smack-root	2021/01/29 11:41	upstream	bec4c296	6593fd32	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-smack-root	2021/01/28 21:14	upstream	e5ff2cb9	7df34f59	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce	2021/01/28 19:50	upstream	e5ff2cb9	7df34f59	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce	2021/01/27 23:48	upstream	76c057c8	eefc07f2	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce	2021/01/27 08:15	upstream	2ab38c17	55a7d4df	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-smack-root	2021/01/26 17:23	upstream	13391c60	55a7d4df	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce	2021/01/25 22:52	upstream	f8ad8187	52e37319	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce	2021/01/25 10:31	upstream	6ee1d745	52e37319	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-smack-root	2021/01/24 22:53	upstream	e6806137	52e37319	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-smack-root	2021/01/24 20:32	upstream	e6806137	52e37319	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-root	2021/01/22 18:41	upstream	83d09ad4	d4f4eca5	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-root	2021/01/22 05:30	upstream	9f29bd8b	d4f4eca5	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-386	2021/03/01 15:48	upstream	fe07bfda	4c37c133	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-386	2021/03/01 14:37	upstream	fe07bfda	4c37c133	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-386	2021/03/01 00:47	upstream	06d5d309	4c37c133	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-386	2021/02/27 01:19	upstream	8b83369d	4c37c133	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-386	2021/02/22 15:32	upstream	31caf8b2	a659b3f1	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-386	2021/02/21 04:38	upstream	e767b353	3e5ed8b4	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-386	2021/02/17 22:32	upstream	f40ddce8	14052202	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-386	2021/02/07 09:39	upstream	825b5991	2ce644fc	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-386	2021/02/07 00:50	upstream	964d069f	0655e081	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-386	2021/02/01 15:18	upstream	1048ba83	e6b95f32	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-386	2021/01/30 08:24	upstream	0e9bcda5	fc9fd31e	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-386	2021/01/28 16:05	upstream	76c057c8	7df34f59	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-386	2021/01/28 01:14	upstream	76c057c8	eefc07f2	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-386	2021/01/27 12:24	upstream	2ab38c17	a0ebf917	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-386	2021/01/26 13:12	upstream	13391c60	52e37319	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-linux-next-kasan-gce-root	2021/01/18 20:44	linux-next	93bf8b94	63631df1	.config	log	report			info	possible deadlock in kill_fasync
ci-upstream-kasan-gce-selinux-root	2021/01/17 01:52	upstream	0da0a8a0	65a7a854	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/09/29 10:21	linux-next	663b07a4	1b88c6d5	.config	log	report			info