Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.19' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 65.123014][ T8520] [ 65.125374][ T8520] ===================================================== [ 65.132299][ T8520] WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected [ 65.139730][ T8520] 5.10.0-rc2-syzkaller #0 Not tainted [ 65.145093][ T8520] ----------------------------------------------------- [ 65.152614][ T8520] syz-executor752/8520 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: [ 65.160668][ T8520] ffff8880180be638 (&f->f_owner.lock){.+.+}-{2:2}, at: send_sigio+0x24/0x360 [ 65.169451][ T8520] [ 65.169451][ T8520] and this task is already holding: [ 65.177593][ T8520] ffff8880191e0018 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x14b/0x460 [ 65.186275][ T8520] which would create a new lock dependency: [ 65.192148][ T8520] (&new->fa_lock){....}-{2:2} -> (&f->f_owner.lock){.+.+}-{2:2} [ 65.199869][ T8520] [ 65.199869][ T8520] but this new dependency connects a HARDIRQ-irq-safe lock: [ 65.209999][ T8520] (&dev->event_lock){-...}-{2:2} [ 65.210014][ T8520] [ 65.210014][ T8520] ... which became HARDIRQ-irq-safe at: [ 65.222715][ T8520] lock_acquire+0x2a3/0x8c0 [ 65.227308][ T8520] _raw_spin_lock_irqsave+0x39/0x50 [ 65.232626][ T8520] input_event+0x7b/0xb0 [ 65.236956][ T8520] psmouse_report_standard_buttons+0x2c/0x80 [ 65.243037][ T8520] psmouse_process_byte+0x1e1/0x890 [ 65.248303][ T8520] psmouse_handle_byte+0x41/0x1b0 [ 65.253413][ T8520] psmouse_interrupt+0x304/0xf00 [ 65.258437][ T8520] serio_interrupt+0x88/0x150 [ 65.263178][ T8520] i8042_interrupt+0x27a/0x520 [ 65.268007][ T8520] __handle_irq_event_percpu+0x303/0x8f0 [ 65.273708][ T8520] handle_irq_event+0x102/0x290 [ 65.278654][ T8520] handle_edge_irq+0x25f/0xd00 [ 65.283487][ T8520] asm_call_irq_on_stack+0xf/0x20 [ 65.288594][ T8520] common_interrupt+0x120/0x200 [ 65.293533][ T8520] asm_common_interrupt+0x1e/0x40 [ 65.298648][ T8520] _raw_spin_unlock_irqrestore+0x25/0x50 [ 65.304348][ T8520] i8042_command+0x111/0x130 [ 65.309001][ T8520] i8042_aux_write+0xd7/0x120 [ 65.313754][ T8520] ps2_do_sendbyte+0x2ca/0x710 [ 65.318590][ T8520] ps2_sendbyte+0x58/0x150 [ 65.323086][ T8520] cypress_ps2_sendbyte+0x2e/0x160 [ 65.328258][ T8520] cypress_send_ext_cmd+0x1d0/0x8d0 [ 65.333532][ T8520] cypress_detect+0x75/0x190 [ 65.338191][ T8520] psmouse_try_protocol+0x211/0x370 [ 65.343471][ T8520] psmouse_extensions+0x557/0x930 [ 65.348561][ T8520] psmouse_switch_protocol+0x52a/0x740 [ 65.354086][ T8520] psmouse_connect+0x5e6/0xfc0 [ 65.358927][ T8520] serio_driver_probe+0x72/0xa0 [ 65.364292][ T8520] really_probe+0x291/0xde0 [ 65.368870][ T8520] driver_probe_device+0x26b/0x3d0 [ 65.374042][ T8520] device_driver_attach+0x228/0x290 [ 65.379304][ T8520] __driver_attach+0x15b/0x2f0 [ 65.384129][ T8520] bus_for_each_dev+0x147/0x1d0 [ 65.389045][ T8520] serio_handle_event+0x5f6/0xa30 [ 65.394844][ T8520] process_one_work+0x933/0x15a0 [ 65.399851][ T8520] worker_thread+0x64c/0x1120 [ 65.404602][ T8520] kthread+0x3af/0x4a0 [ 65.408733][ T8520] ret_from_fork+0x1f/0x30 [ 65.413206][ T8520] [ 65.413206][ T8520] to a HARDIRQ-irq-unsafe lock: [ 65.420200][ T8520] (&f->f_owner.lock){.+.+}-{2:2} [ 65.420214][ T8520] [ 65.420214][ T8520] ... which became HARDIRQ-irq-unsafe at: [ 65.433097][ T8520] ... [ 65.433117][ T8520] lock_acquire+0x2a3/0x8c0 [ 65.440286][ T8520] _raw_read_lock+0x5b/0x70 [ 65.444854][ T8520] do_fcntl+0xb2c/0x1070 [ 65.449297][ T8520] __x64_sys_fcntl+0x165/0x1e0 [ 65.454262][ T8520] do_syscall_64+0x2d/0x70 [ 65.458745][ T8520] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 65.464715][ T8520] [ 65.464715][ T8520] other info that might help us debug this: [ 65.464715][ T8520] [ 65.474926][ T8520] Chain exists of: [ 65.474926][ T8520] &dev->event_lock --> &new->fa_lock --> &f->f_owner.lock [ 65.474926][ T8520] [ 65.488021][ T8520] Possible interrupt unsafe locking scenario: [ 65.488021][ T8520] [ 65.496323][ T8520] CPU0 CPU1 [ 65.501684][ T8520] ---- ---- [ 65.507048][ T8520] lock(&f->f_owner.lock); [ 65.511636][ T8520] local_irq_disable(); [ 65.518466][ T8520] lock(&dev->event_lock); [ 65.525467][ T8520] lock(&new->fa_lock); [ 65.532250][ T8520] [ 65.535682][ T8520] lock(&dev->event_lock); [ 65.540344][ T8520] [ 65.540344][ T8520] *** DEADLOCK *** [ 65.540344][ T8520] [ 65.548467][ T8520] 8 locks held by syz-executor752/8520: [ 65.553998][ T8520] #0: ffff88801cd5e110 (&evdev->mutex){+.+.}-{3:3}, at: evdev_write+0x1d3/0x760 [ 65.563176][ T8520] #1: ffff888143428230 (&dev->event_lock){-...}-{2:2}, at: input_inject_event+0xa6/0x310 [ 65.573068][ T8520] #2: ffffffff8b337160 (rcu_read_lock){....}-{1:2}, at: input_inject_event+0x92/0x310 [ 65.582704][ T8520] #3: ffffffff8b337160 (rcu_read_lock){....}-{1:2}, at: input_pass_values.part.0+0x0/0x700 [ 65.593211][ T8520] #4: ffffffff8b337160 (rcu_read_lock){....}-{1:2}, at: evdev_events+0x59/0x3f0 [ 65.602332][ T8520] #5: ffff88801905b028 (&client->buffer_lock){....}-{2:2}, at: evdev_pass_values.part.0+0xf6/0x970 [ 65.613096][ T8520] #6: ffffffff8b337160 (rcu_read_lock){....}-{1:2}, at: kill_fasync+0x3d/0x460 [ 65.622137][ T8520] #7: ffff8880191e0018 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x14b/0x460 [ 65.631249][ T8520] [ 65.631249][ T8520] the dependencies between HARDIRQ-irq-safe lock and the holding lock: [ 65.641653][ T8520] -> (&dev->event_lock){-...}-{2:2} { [ 65.647201][ T8520] IN-HARDIRQ-W at: [ 65.651374][ T8520] lock_acquire+0x2a3/0x8c0 [ 65.657874][ T8520] _raw_spin_lock_irqsave+0x39/0x50 [ 65.665056][ T8520] input_event+0x7b/0xb0 [ 65.671276][ T8520] psmouse_report_standard_buttons+0x2c/0x80 [ 65.679238][ T8520] psmouse_process_byte+0x1e1/0x890 [ 65.686414][ T8520] psmouse_handle_byte+0x41/0x1b0 [ 65.693425][ T8520] psmouse_interrupt+0x304/0xf00 [ 65.700349][ T8520] serio_interrupt+0x88/0x150 [ 65.707012][ T8520] i8042_interrupt+0x27a/0x520 [ 65.714276][ T8520] __handle_irq_event_percpu+0x303/0x8f0 [ 65.721902][ T8520] handle_irq_event+0x102/0x290 [ 65.728757][ T8520] handle_edge_irq+0x25f/0xd00 [ 65.735520][ T8520] asm_call_irq_on_stack+0xf/0x20 [ 65.742541][ T8520] common_interrupt+0x120/0x200 [ 65.749370][ T8520] asm_common_interrupt+0x1e/0x40 [ 65.756372][ T8520] _raw_spin_unlock_irqrestore+0x25/0x50 [ 65.764006][ T8520] i8042_command+0x111/0x130 [ 65.770590][ T8520] i8042_aux_write+0xd7/0x120 [ 65.777244][ T8520] ps2_do_sendbyte+0x2ca/0x710 [ 65.784016][ T8520] ps2_sendbyte+0x58/0x150 [ 65.790426][ T8520] cypress_ps2_sendbyte+0x2e/0x160 [ 65.797511][ T8520] cypress_send_ext_cmd+0x1d0/0x8d0 [ 65.804688][ T8520] cypress_detect+0x75/0x190 [ 65.811255][ T8520] psmouse_try_protocol+0x211/0x370 [ 65.818428][ T8520] psmouse_extensions+0x557/0x930 [ 65.825432][ T8520] psmouse_switch_protocol+0x52a/0x740 [ 65.832956][ T8520] psmouse_connect+0x5e6/0xfc0 [ 65.839707][ T8520] serio_driver_probe+0x72/0xa0 [ 65.846544][ T8520] really_probe+0x291/0xde0 [ 65.853040][ T8520] driver_probe_device+0x26b/0x3d0 [ 65.860143][ T8520] device_driver_attach+0x228/0x290 [ 65.867314][ T8520] __driver_attach+0x15b/0x2f0 [ 65.874063][ T8520] bus_for_each_dev+0x147/0x1d0 [ 65.880897][ T8520] serio_handle_event+0x5f6/0xa30 [ 65.887897][ T8520] process_one_work+0x933/0x15a0 [ 65.894807][ T8520] worker_thread+0x64c/0x1120 [ 65.902106][ T8520] kthread+0x3af/0x4a0 [ 65.908174][ T8520] ret_from_fork+0x1f/0x30 [ 65.914582][ T8520] INITIAL USE at: [ 65.918660][ T8520] lock_acquire+0x2a3/0x8c0 [ 65.925083][ T8520] _raw_spin_lock_irqsave+0x39/0x50 [ 65.932195][ T8520] input_inject_event+0xa6/0x310 [ 65.939054][ T8520] led_set_brightness_nosleep+0xe6/0x1a0 [ 65.946595][ T8520] led_set_brightness+0x134/0x170 [ 65.953538][ T8520] led_trigger_event+0x70/0xd0 [ 65.960216][ T8520] kbd_led_trigger_activate+0xfa/0x130 [ 65.967578][ T8520] led_trigger_set+0x61e/0xbd0 [ 65.974250][ T8520] led_trigger_set_default+0x1a6/0x230 [ 65.981609][ T8520] led_classdev_register_ext+0x5b1/0x7c0 [ 65.989922][ T8520] input_leds_connect+0x3fb/0x740 [ 65.996856][ T8520] input_attach_handler+0x180/0x1f0 [ 66.003960][ T8520] input_register_device.cold+0xf0/0x307 [ 66.011500][ T8520] atkbd_connect+0x736/0xa00 [ 66.017993][ T8520] serio_driver_probe+0x72/0xa0 [ 66.024733][ T8520] really_probe+0x291/0xde0 [ 66.031129][ T8520] driver_probe_device+0x26b/0x3d0 [ 66.038148][ T8520] device_driver_attach+0x228/0x290 [ 66.045258][ T8520] __driver_attach+0x15b/0x2f0 [ 66.051930][ T8520] bus_for_each_dev+0x147/0x1d0 [ 66.058687][ T8520] serio_handle_event+0x5f6/0xa30 [ 66.065600][ T8520] process_one_work+0x933/0x15a0 [ 66.072425][ T8520] worker_thread+0x64c/0x1120 [ 66.079002][ T8520] kthread+0x3af/0x4a0 [ 66.084960][ T8520] ret_from_fork+0x1f/0x30 [ 66.091261][ T8520] } [ 66.093921][ T8520] ... key at: [] __key.8+0x0/0x40 [ 66.101179][ T8520] ... acquired at: [ 66.105162][ T8520] _raw_spin_lock+0x2a/0x40 [ 66.109826][ T8520] evdev_pass_values.part.0+0xf6/0x970 [ 66.115450][ T8520] evdev_events+0x28b/0x3f0 [ 66.120135][ T8520] input_to_handler+0x2a0/0x4c0 [ 66.125140][ T8520] input_pass_values.part.0+0x284/0x700 [ 66.130837][ T8520] input_handle_event+0x324/0x1400 [ 66.136140][ T8520] input_inject_event+0x2f5/0x310 [ 66.141327][ T8520] evdev_write+0x430/0x760 [ 66.146422][ T8520] vfs_write+0x28e/0x700 [ 66.150828][ T8520] ksys_write+0x1ee/0x250 [ 66.155309][ T8520] do_syscall_64+0x2d/0x70 [ 66.159881][ T8520] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.165929][ T8520] [ 66.168230][ T8520] -> (&client->buffer_lock){....}-{2:2} { [ 66.174036][ T8520] INITIAL USE at: [ 66.178001][ T8520] lock_acquire+0x2a3/0x8c0 [ 66.184226][ T8520] _raw_spin_lock+0x2a/0x40 [ 66.190464][ T8520] evdev_pass_values.part.0+0xf6/0x970 [ 66.197649][ T8520] evdev_events+0x28b/0x3f0 [ 66.203867][ T8520] input_to_handler+0x2a0/0x4c0 [ 66.210431][ T8520] input_pass_values.part.0+0x284/0x700 [ 66.217704][ T8520] input_handle_event+0x324/0x1400 [ 66.224527][ T8520] input_inject_event+0x2f5/0x310 [ 66.231280][ T8520] evdev_write+0x430/0x760 [ 66.237423][ T8520] vfs_write+0x28e/0x700 [ 66.243395][ T8520] ksys_write+0x1ee/0x250 [ 66.249438][ T8520] do_syscall_64+0x2d/0x70 [ 66.255588][ T8520] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.263186][ T8520] } [ 66.265757][ T8520] ... key at: [] __key.4+0x0/0x40 [ 66.272942][ T8520] ... acquired at: [ 66.276815][ T8520] _raw_read_lock+0x5b/0x70 [ 66.281487][ T8520] kill_fasync+0x14b/0x460 [ 66.286060][ T8520] evdev_pass_values.part.0+0x64e/0x970 [ 66.291767][ T8520] evdev_events+0x28b/0x3f0 [ 66.296427][ T8520] input_to_handler+0x2a0/0x4c0 [ 66.301428][ T8520] input_pass_values.part.0+0x284/0x700 [ 66.307120][ T8520] input_handle_event+0x324/0x1400 [ 66.312395][ T8520] input_inject_event+0x2f5/0x310 [ 66.317585][ T8520] evdev_write+0x430/0x760 [ 66.322154][ T8520] vfs_write+0x28e/0x700 [ 66.326560][ T8520] ksys_write+0x1ee/0x250 [ 66.331043][ T8520] do_syscall_64+0x2d/0x70 [ 66.335716][ T8520] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.341769][ T8520] [ 66.344094][ T8520] -> (&new->fa_lock){....}-{2:2} { [ 66.349191][ T8520] INITIAL READ USE at: [ 66.353506][ T8520] lock_acquire+0x2a3/0x8c0 [ 66.360000][ T8520] _raw_read_lock+0x5b/0x70 [ 66.367097][ T8520] kill_fasync+0x14b/0x460 [ 66.373491][ T8520] evdev_pass_values.part.0+0x64e/0x970 [ 66.381041][ T8520] evdev_events+0x28b/0x3f0 [ 66.387545][ T8520] input_to_handler+0x2a0/0x4c0 [ 66.394392][ T8520] input_pass_values.part.0+0x284/0x700 [ 66.401919][ T8520] input_handle_event+0x324/0x1400 [ 66.409021][ T8520] input_inject_event+0x2f5/0x310 [ 66.416026][ T8520] evdev_write+0x430/0x760 [ 66.422425][ T8520] vfs_write+0x28e/0x700 [ 66.428646][ T8520] ksys_write+0x1ee/0x250 [ 66.435040][ T8520] do_syscall_64+0x2d/0x70 [ 66.441461][ T8520] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.449337][ T8520] } [ 66.451825][ T8520] ... key at: [] __key.0+0x0/0x40 [ 66.458928][ T8520] ... acquired at: [ 66.462744][ T8520] lock_acquire+0x2a3/0x8c0 [ 66.467415][ T8520] _raw_read_lock+0x5b/0x70 [ 66.472088][ T8520] send_sigio+0x24/0x360 [ 66.476485][ T8520] kill_fasync+0x205/0x460 [ 66.481054][ T8520] evdev_pass_values.part.0+0x64e/0x970 [ 66.486764][ T8520] evdev_events+0x28b/0x3f0 [ 66.491422][ T8520] input_to_handler+0x2a0/0x4c0 [ 66.496422][ T8520] input_pass_values.part.0+0x284/0x700 [ 66.502130][ T8520] input_handle_event+0x324/0x1400 [ 66.507386][ T8520] input_inject_event+0x2f5/0x310 [ 66.512845][ T8520] evdev_write+0x430/0x760 [ 66.517427][ T8520] vfs_write+0x28e/0x700 [ 66.521832][ T8520] ksys_write+0x1ee/0x250 [ 66.526311][ T8520] do_syscall_64+0x2d/0x70 [ 66.530877][ T8520] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.536923][ T8520] [ 66.539224][ T8520] [ 66.539224][ T8520] the dependencies between the lock to be acquired [ 66.539228][ T8520] and HARDIRQ-irq-unsafe lock: [ 66.552725][ T8520] -> (&f->f_owner.lock){.+.+}-{2:2} { [ 66.558086][ T8520] HARDIRQ-ON-R at: [ 66.562074][ T8520] lock_acquire+0x2a3/0x8c0 [ 66.568206][ T8520] _raw_read_lock+0x5b/0x70 [ 66.574348][ T8520] do_fcntl+0xb2c/0x1070 [ 66.580218][ T8520] __x64_sys_fcntl+0x165/0x1e0 [ 66.586609][ T8520] do_syscall_64+0x2d/0x70 [ 66.592669][ T8520] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.600196][ T8520] SOFTIRQ-ON-R at: [ 66.604182][ T8520] lock_acquire+0x2a3/0x8c0 [ 66.610317][ T8520] _raw_read_lock+0x5b/0x70 [ 66.616469][ T8520] do_fcntl+0xb2c/0x1070 [ 66.622346][ T8520] __x64_sys_fcntl+0x165/0x1e0 [ 66.628749][ T8520] do_syscall_64+0x2d/0x70 [ 66.635156][ T8520] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.642668][ T8520] INITIAL READ USE at: [ 66.646983][ T8520] lock_acquire+0x2a3/0x8c0 [ 66.653464][ T8520] _raw_read_lock+0x5b/0x70 [ 66.659966][ T8520] do_fcntl+0xb2c/0x1070 [ 66.666196][ T8520] __x64_sys_fcntl+0x165/0x1e0 [ 66.678271][ T8520] do_syscall_64+0x2d/0x70 [ 66.684674][ T8520] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.692536][ T8520] } [ 66.695041][ T8520] ... key at: [] __key.5+0x0/0x40 [ 66.702125][ T8520] ... acquired at: [ 66.705916][ T8520] lock_acquire+0x2a3/0x8c0 [ 66.710570][ T8520] _raw_read_lock+0x5b/0x70 [ 66.715238][ T8520] send_sigio+0x24/0x360 [ 66.719655][ T8520] kill_fasync+0x205/0x460 [ 66.724234][ T8520] evdev_pass_values.part.0+0x64e/0x970 [ 66.729930][ T8520] evdev_events+0x28b/0x3f0 [ 66.734586][ T8520] input_to_handler+0x2a0/0x4c0 [ 66.739592][ T8520] input_pass_values.part.0+0x284/0x700 [ 66.745296][ T8520] input_handle_event+0x324/0x1400 [ 66.750559][ T8520] input_inject_event+0x2f5/0x310 [ 66.755734][ T8520] evdev_write+0x430/0x760 [ 66.760306][ T8520] vfs_write+0x28e/0x700 [ 66.764722][ T8520] ksys_write+0x1ee/0x250 [ 66.769215][ T8520] do_syscall_64+0x2d/0x70 [ 66.773787][ T8520] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.779873][ T8520] [ 66.782203][ T8520] [ 66.782203][ T8520] stack backtrace: [ 66.788077][ T8520] CPU: 0 PID: 8520 Comm: syz-executor752 Not tainted 5.10.0-rc2-syzkaller #0 [ 66.796809][ T8520] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.806864][ T8520] Call Trace: [ 66.810149][ T8520] dump_stack+0x107/0x163 [ 66.814455][ T8520] check_irq_usage.cold+0x4c2/0x5d8 [ 66.819648][ T8520] ? print_shortest_lock_dependencies+0x80/0x80 [ 66.825891][ T8520] ? __kernel_text_address+0x9/0x30 [ 66.831070][ T8520] ? check_path.constprop.0+0x22/0x40 [ 66.836424][ T8520] ? stack_trace_save+0x8c/0xc0 [ 66.841252][ T8520] ? lockdep_lock+0xea/0x200 [ 66.845822][ T8520] ? alloc_chain_hlocks+0x230/0x770 [ 66.851011][ T8520] __lock_acquire+0x2840/0x5590 [ 66.855856][ T8520] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 66.861828][ T8520] lock_acquire+0x2a3/0x8c0 [ 66.866309][ T8520] ? send_sigio+0x24/0x360 [ 66.870729][ T8520] ? lock_release+0x710/0x710 [ 66.875399][ T8520] ? lock_release+0x710/0x710 [ 66.880054][ T8520] ? lock_release+0x710/0x710 [ 66.884738][ T8520] ? lock_release+0x710/0x710 [ 66.889406][ T8520] _raw_read_lock+0x5b/0x70 [ 66.893903][ T8520] ? send_sigio+0x24/0x360 [ 66.898304][ T8520] send_sigio+0x24/0x360 [ 66.902535][ T8520] kill_fasync+0x205/0x460 [ 66.906935][ T8520] evdev_pass_values.part.0+0x64e/0x970 [ 66.912469][ T8520] ? evdev_release+0x410/0x410 [ 66.917221][ T8520] ? ktime_mono_to_any+0xb8/0x1a0 [ 66.922248][ T8520] evdev_events+0x28b/0x3f0 [ 66.926730][ T8520] ? evdev_pass_values.part.0+0x970/0x970 [ 66.932441][ T8520] input_to_handler+0x2a0/0x4c0 [ 66.937268][ T8520] input_pass_values.part.0+0x284/0x700 [ 66.942800][ T8520] ? rwlock_bug.part.0+0x90/0x90 [ 66.947726][ T8520] input_handle_event+0x324/0x1400 [ 66.952827][ T8520] input_inject_event+0x2f5/0x310 [ 66.957833][ T8520] evdev_write+0x430/0x760 [ 66.962257][ T8520] ? evdev_read+0xe40/0xe40 [ 66.966740][ T8520] ? security_file_permission+0x248/0x560 [ 66.972452][ T8520] ? evdev_read+0xe40/0xe40 [ 66.977725][ T8520] vfs_write+0x28e/0x700 [ 66.981942][ T8520] ksys_write+0x1ee/0x250 [ 66.986253][ T8520] ? __ia32_sys_read+0xb0/0xb0 [ 66.991439][ T8520] ? syscall_enter_from_user_mode+0x1d/0x50 [ 66.997924][ T8520] do_syscall_64+0x2d/0x70 [ 67.002321][ T8520] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 67.008196][ T8520] RIP: 0033:0x443f89 [ 67.012086][ T8520] 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 fb d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [