FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
6.13.0-rc1-syzkaller-00025-gfeffde684ac2 #0 Not tainted
------------------------------------------------------
syz.6.494/8333 is trying to acquire lock:
ffffffff8e0c8800 (console_owner){-...}-{0:0}, at: console_lock_spinning_enable+0x9f/0xd0 kernel/printk/printk.c:1924

but task is already holding lock:
ffff8880b873ebd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (&rq->__lock){-.-.}-{2:2}:
       _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
       raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598
       raw_spin_rq_lock kernel/sched/sched.h:1514 [inline]
       task_rq_lock+0xcf/0x3b0 kernel/sched/core.c:700
       cgroup_move_task+0x82/0x250 kernel/sched/psi.c:1161
       css_set_move_task+0x288/0x5f0 kernel/cgroup/cgroup.c:898
       cgroup_post_fork+0x1c6/0x910 kernel/cgroup/cgroup.c:6691
       copy_process+0x50d9/0x8df0 kernel/fork.c:2621
       kernel_clone+0xfd/0x960 kernel/fork.c:2807
       user_mode_thread+0xb4/0xf0 kernel/fork.c:2885
       rest_init+0x23/0x2b0 init/main.c:712
       start_kernel+0x3e4/0x4d0 init/main.c:1102
       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507
       x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488
       common_startup_64+0x13e/0x148

-> #3 (&p->pi_lock){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
       class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline]
       try_to_wake_up+0xb6/0x1490 kernel/sched/core.c:4205
       __wake_up_common+0x131/0x1e0 kernel/sched/wait.c:89
       __wake_up_common_lock kernel/sched/wait.c:106 [inline]
       __wake_up+0x31/0x60 kernel/sched/wait.c:127
       tty_port_default_wakeup+0x2a/0x40 drivers/tty/tty_port.c:69
       serial8250_tx_chars+0x68e/0x860 drivers/tty/serial/8250/8250_port.c:1840
       serial8250_handle_irq+0x74d/0xc80 drivers/tty/serial/8250/8250_port.c:1948
       serial8250_default_handle_irq+0x9a/0x210 drivers/tty/serial/8250/8250_port.c:1968
       serial8250_interrupt+0x103/0x210 drivers/tty/serial/8250/8250_core.c:86
       __handle_irq_event_percpu+0x229/0x7d0 kernel/irq/handle.c:158
       handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
       handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
       handle_edge_irq+0x263/0xd10 kernel/irq/chip.c:831
       generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
       handle_irq arch/x86/kernel/irq.c:247 [inline]
       call_irq_handler arch/x86/kernel/irq.c:259 [inline]
       __common_interrupt+0xdf/0x250 arch/x86/kernel/irq.c:285
       common_interrupt+0x61/0xe0 arch/x86/kernel/irq.c:278
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
       unwind_next_frame+0x540/0x20c0 arch/x86/kernel/unwind_orc.c:512
       arch_stack_walk+0x95/0x100 arch/x86/kernel/stacktrace.c:25
       stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
       kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
       kasan_save_track+0x14/0x30 mm/kasan/common.c:68
       kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:582
       poison_slab_object mm/kasan/common.c:247 [inline]
       __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
       kasan_slab_free include/linux/kasan.h:233 [inline]
       slab_free_hook mm/slub.c:2338 [inline]
       slab_free_after_rcu_debug+0x115/0x340 mm/slub.c:4648
       rcu_do_batch kernel/rcu/tree.c:2567 [inline]
       rcu_core+0x79d/0x14d0 kernel/rcu/tree.c:2823
       handle_softirqs+0x213/0x8f0 kernel/softirq.c:554
       do_softirq kernel/softirq.c:455 [inline]
       do_softirq+0xb2/0xf0 kernel/softirq.c:442
       __local_bh_enable_ip+0x100/0x120 kernel/softirq.c:382
       local_bh_enable include/linux/bottom_half.h:33 [inline]
       fpregs_unlock arch/x86/include/asm/fpu/api.h:80 [inline]
       copy_fpstate_to_sigframe+0x2d3/0xaf0 arch/x86/kernel/fpu/signal.c:250
       get_sigframe+0x4aa/0x9c0 arch/x86/kernel/signal.c:163
       x64_setup_rt_frame+0x129/0xcf0 arch/x86/kernel/signal_64.c:175
       setup_rt_frame arch/x86/kernel/signal.c:250 [inline]
       handle_signal arch/x86/kernel/signal.c:294 [inline]
       arch_do_signal_or_restart+0x5e6/0x7e0 arch/x86/kernel/signal.c:339
       exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
       exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
       __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
       syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
       do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&tty->write_wait){-.-.}-{3:3}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
       __wake_up_common_lock kernel/sched/wait.c:105 [inline]
       __wake_up+0x1c/0x60 kernel/sched/wait.c:127
       tty_port_default_wakeup+0x2a/0x40 drivers/tty/tty_port.c:69
       serial8250_tx_chars+0x68e/0x860 drivers/tty/serial/8250/8250_port.c:1840
       serial8250_handle_irq+0x74d/0xc80 drivers/tty/serial/8250/8250_port.c:1948
       serial8250_default_handle_irq+0x9a/0x210 drivers/tty/serial/8250/8250_port.c:1968
       serial8250_interrupt+0x103/0x210 drivers/tty/serial/8250/8250_core.c:86
       __handle_irq_event_percpu+0x229/0x7d0 kernel/irq/handle.c:158
       handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
       handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
       handle_edge_irq+0x263/0xd10 kernel/irq/chip.c:831
       generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
       handle_irq arch/x86/kernel/irq.c:247 [inline]
       call_irq_handler arch/x86/kernel/irq.c:259 [inline]
       __common_interrupt+0xdf/0x250 arch/x86/kernel/irq.c:285
       common_interrupt+0xba/0xe0 arch/x86/kernel/irq.c:278
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
       __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
       _raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
       spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
       uart_port_unlock_irqrestore include/linux/serial_core.h:786 [inline]
       uart_write+0x2a4/0xb30 drivers/tty/serial/serial_core.c:636
       process_output_block drivers/tty/n_tty.c:574 [inline]
       n_tty_write+0x419/0x1140 drivers/tty/n_tty.c:2389
       iterate_tty_write drivers/tty/tty_io.c:1015 [inline]
       file_tty_write.constprop.0+0x506/0x9a0 drivers/tty/tty_io.c:1090
       tty_write drivers/tty/tty_io.c:1111 [inline]
       redirected_tty_write drivers/tty/tty_io.c:1134 [inline]
       redirected_tty_write+0xcc/0x140 drivers/tty/tty_io.c:1114
       new_sync_write fs/read_write.c:586 [inline]
       vfs_write+0x5ae/0x1150 fs/read_write.c:679
       ksys_write+0x12b/0x250 fs/read_write.c:731
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&port_lock_key){-.-.}-{3:3}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
       uart_port_lock_irqsave include/linux/serial_core.h:715 [inline]
       serial8250_console_write+0xb56/0x17c0 drivers/tty/serial/8250/8250_port.c:3371
       console_emit_next_record kernel/printk/printk.c:3122 [inline]
       console_flush_all+0x803/0xc60 kernel/printk/printk.c:3210
       __console_flush_and_unlock kernel/printk/printk.c:3269 [inline]
       console_unlock+0xd9/0x210 kernel/printk/printk.c:3309
       vprintk_emit+0x424/0x6f0 kernel/printk/printk.c:2432
       vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:86
       _printk+0xc8/0x100 kernel/printk/printk.c:2457
       register_console+0xbfd/0x1170 kernel/printk/printk.c:4099
       univ8250_console_init+0x5f/0x90 drivers/tty/serial/8250/8250_core.c:513
       console_init+0x154/0x690 kernel/printk/printk.c:4292
       start_kernel+0x29a/0x4d0 init/main.c:1037
       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507
       x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488
       common_startup_64+0x13e/0x148

-> #0 (console_owner){-...}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3161 [inline]
       check_prevs_add kernel/locking/lockdep.c:3280 [inline]
       validate_chain kernel/locking/lockdep.c:3904 [inline]
       __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226
       lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
       console_lock_spinning_enable+0xb0/0xd0 kernel/printk/printk.c:1924
       console_emit_next_record kernel/printk/printk.c:3116 [inline]
       console_flush_all+0x7ac/0xc60 kernel/printk/printk.c:3210
       __console_flush_and_unlock kernel/printk/printk.c:3269 [inline]
       console_unlock+0xd9/0x210 kernel/printk/printk.c:3309
       vprintk_emit+0x424/0x6f0 kernel/printk/printk.c:2432
       vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:86
       _printk+0xc8/0x100 kernel/printk/printk.c:2457
       fail_dump lib/fault-inject.c:46 [inline]
       should_fail_ex+0x46c/0x5b0 lib/fault-inject.c:154
       strncpy_from_user+0x3b/0x2d0 lib/strncpy_from_user.c:118
       strncpy_from_user_nofault+0x7f/0x180 mm/maccess.c:193
       bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:215 [inline]
       ____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:310 [inline]
       bpf_probe_read_compat_str+0xf1/0x170 kernel/trace/bpf_trace.c:306
       bpf_prog_c1796171ffc7efef+0x3e/0x40
       bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline]
       __bpf_prog_run include/linux/filter.h:701 [inline]
       bpf_prog_run include/linux/filter.h:708 [inline]
       __bpf_trace_run kernel/trace/bpf_trace.c:2351 [inline]
       bpf_trace_run4+0x245/0x5a0 kernel/trace/bpf_trace.c:2394
       __bpf_trace_sched_switch+0x13e/0x190 include/trace/events/sched.h:222
       __traceiter_sched_switch+0x6c/0xc0 include/trace/events/sched.h:222
       trace_sched_switch include/trace/events/sched.h:222 [inline]
       __schedule+0x1b71/0x5ad0 kernel/sched/core.c:6753
       preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7078
       irqentry_exit+0x36/0x90 kernel/entry/common.c:354
       asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
       get_current arch/x86/include/asm/current.h:49 [inline]
       write_comp_data+0x11/0x90 kernel/kcov.c:245
       file_end_write include/linux/fs.h:2982 [inline]
       vfs_write+0x2f6/0x1150 fs/read_write.c:687
       ksys_write+0x12b/0x250 fs/read_write.c:731
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  console_owner --> &p->pi_lock --> &rq->__lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&rq->__lock);
                               lock(&p->pi_lock);
                               lock(&rq->__lock);
  lock(console_owner);

 *** DEADLOCK ***

6 locks held by syz.6.494/8333:
 #0: ffff88802b7a27f8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x267/0x390 fs/file.c:1191
 #1: ffff8880578e2420 (sb_writers#3){.+.+}-{0:0}, at: ksys_write+0x12b/0x250 fs/read_write.c:731
 #2: ffff8880b873ebd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598
 #3: ffffffff8e1bb500 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #3: ffffffff8e1bb500 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #3: ffffffff8e1bb500 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2350 [inline]
 #3: ffffffff8e1bb500 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run4+0x1d6/0x5a0 kernel/trace/bpf_trace.c:2394
 #4: ffffffff8e1a8c40 (console_lock){+.+.}-{0:0}, at: vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:86
 #5: ffffffff8e1a8cb0 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:342 [inline]
 #5: ffffffff8e1a8cb0 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:297 [inline]
 #5: ffffffff8e1a8cb0 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:288 [inline]
 #5: ffffffff8e1a8cb0 (console_srcu){....}-{0:0}, at: console_flush_all+0x159/0xc60 kernel/printk/printk.c:3187

stack backtrace:
CPU: 1 UID: 0 PID: 8333 Comm: syz.6.494 Not tainted 6.13.0-rc1-syzkaller-00025-gfeffde684ac2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_circular_bug+0x419/0x5d0 kernel/locking/lockdep.c:2074
 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2206
 check_prev_add kernel/locking/lockdep.c:3161 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain kernel/locking/lockdep.c:3904 [inline]
 __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226
 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
 console_lock_spinning_enable+0xb0/0xd0 kernel/printk/printk.c:1924
 console_emit_next_record kernel/printk/printk.c:3116 [inline]
 console_flush_all+0x7ac/0xc60 kernel/printk/printk.c:3210
 __console_flush_and_unlock kernel/printk/printk.c:3269 [inline]
 console_unlock+0xd9/0x210 kernel/printk/printk.c:3309
 vprintk_emit+0x424/0x6f0 kernel/printk/printk.c:2432
 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:86
 _printk+0xc8/0x100 kernel/printk/printk.c:2457
 fail_dump lib/fault-inject.c:46 [inline]
 should_fail_ex+0x46c/0x5b0 lib/fault-inject.c:154
 strncpy_from_user+0x3b/0x2d0 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x7f/0x180 mm/maccess.c:193
 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:215 [inline]
 ____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:310 [inline]
 bpf_probe_read_compat_str+0xf1/0x170 kernel/trace/bpf_trace.c:306
 bpf_prog_c1796171ffc7efef+0x3e/0x40
 bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline]
 __bpf_prog_run include/linux/filter.h:701 [inline]
 bpf_prog_run include/linux/filter.h:708 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2351 [inline]
 bpf_trace_run4+0x245/0x5a0 kernel/trace/bpf_trace.c:2394
 __bpf_trace_sched_switch+0x13e/0x190 include/trace/events/sched.h:222
 __traceiter_sched_switch+0x6c/0xc0 include/trace/events/sched.h:222
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x1b71/0x5ad0 kernel/sched/core.c:6753
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7078
 irqentry_exit+0x36/0x90 kernel/entry/common.c:354
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data+0x11/0x90 kernel/kcov.c:246
Code: cc cc cc cc 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 49 89 d2 49 89 f8 49 89 f1 65 48 8b 15 5f d2 69 7e <65> 8b 05 60 d2 69 7e a9 00 01 ff 00 74 1d f6 c4 01 74 67 a9 00 00
RSP: 0018:ffffc90004b57d20 EFLAGS: 00000286
RAX: 0000000000000000 RBX: 0000000000008000 RCX: ffffffff820e3416
RDX: ffff888030f94880 RSI: 0000000000008000 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000008000
R10: 0000000000008000 R11: 1ffffffff1c38cf1 R12: ffff88807e461038
R13: ffff88807e461038 R14: 0000000000000000 R15: 1ffff9200096afaf
 file_end_write include/linux/fs.h:2982 [inline]
 vfs_write+0x2f6/0x1150 fs/read_write.c:687
 ksys_write+0x12b/0x250 fs/read_write.c:731
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5a1e97e9cf
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007f5a1f6cc050 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00007f5a1e97e9cf
RDX: 0000000000000001 RSI: 00007f5a1f6cc0a0 RDI: 0000000000000006
RBP: 00007f5a1f6cc0a0 R08: 0000000000000000 R09: 00007f5a1f6cbe17
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f5a1eb46160 R15: 00007ffc44cd7178
 </TASK>
CPU: 1 UID: 0 PID: 8333 Comm: syz.6.494 Not tainted 6.13.0-rc1-syzkaller-00025-gfeffde684ac2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 fail_dump lib/fault-inject.c:53 [inline]
 should_fail_ex+0x497/0x5b0 lib/fault-inject.c:154
 strncpy_from_user+0x3b/0x2d0 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x7f/0x180 mm/maccess.c:193
 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:215 [inline]
 ____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:310 [inline]
 bpf_probe_read_compat_str+0xf1/0x170 kernel/trace/bpf_trace.c:306
 bpf_prog_c1796171ffc7efef+0x3e/0x40
 bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline]
 __bpf_prog_run include/linux/filter.h:701 [inline]
 bpf_prog_run include/linux/filter.h:708 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2351 [inline]
 bpf_trace_run4+0x245/0x5a0 kernel/trace/bpf_trace.c:2394
 __bpf_trace_sched_switch+0x13e/0x190 include/trace/events/sched.h:222
 __traceiter_sched_switch+0x6c/0xc0 include/trace/events/sched.h:222
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x1b71/0x5ad0 kernel/sched/core.c:6753
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7078
 irqentry_exit+0x36/0x90 kernel/entry/common.c:354
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data+0x11/0x90 kernel/kcov.c:246
Code: cc cc cc cc 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 49 89 d2 49 89 f8 49 89 f1 65 48 8b 15 5f d2 69 7e <65> 8b 05 60 d2 69 7e a9 00 01 ff 00 74 1d f6 c4 01 74 67 a9 00 00
RSP: 0018:ffffc90004b57d20 EFLAGS: 00000286
RAX: 0000000000000000 RBX: 0000000000008000 RCX: ffffffff820e3416
RDX: ffff888030f94880 RSI: 0000000000008000 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000008000
R10: 0000000000008000 R11: 1ffffffff1c38cf1 R12: ffff88807e461038
R13: ffff88807e461038 R14: 0000000000000000 R15: 1ffff9200096afaf
 file_end_write include/linux/fs.h:2982 [inline]
 vfs_write+0x2f6/0x1150 fs/read_write.c:687
 ksys_write+0x12b/0x250 fs/read_write.c:731
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5a1e97e9cf
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007f5a1f6cc050 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00007f5a1e97e9cf
RDX: 0000000000000001 RSI: 00007f5a1f6cc0a0 RDI: 0000000000000006
RBP: 00007f5a1f6cc0a0 R08: 0000000000000000 R09: 00007f5a1f6cbe17
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f5a1eb46160 R15: 00007ffc44cd7178
 </TASK>
----------------
Code disassembly (best guess):
   0:	cc                   	int3
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   9:	90                   	nop
   a:	90                   	nop
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	49 89 d2             	mov    %rdx,%r10
  1c:	49 89 f8             	mov    %rdi,%r8
  1f:	49 89 f1             	mov    %rsi,%r9
  22:	65 48 8b 15 5f d2 69 	mov    %gs:0x7e69d25f(%rip),%rdx        # 0x7e69d289
  29:	7e
* 2a:	65 8b 05 60 d2 69 7e 	mov    %gs:0x7e69d260(%rip),%eax        # 0x7e69d291 <-- trapping instruction
  31:	a9 00 01 ff 00       	test   $0xff0100,%eax
  36:	74 1d                	je     0x55
  38:	f6 c4 01             	test   $0x1,%ah
  3b:	74 67                	je     0xa4
  3d:	a9                   	.byte 0xa9