FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.4.245/7149 is trying to acquire lock: ffffffff8e2d6bc0 (console_owner){-.-.}-{0:0}, at: console_lock_spinning_enable+0x61/0x80 kernel/printk/printk.c:1900 but task is already holding lock: ffff8880b853add8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:639 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:639 raw_spin_rq_lock kernel/sched/sched.h:1580 [inline] task_rq_lock+0xcf/0x490 kernel/sched/core.c:739 cgroup_move_task+0x81/0x2a0 kernel/sched/psi.c:1170 css_set_move_task+0x288/0x5f0 kernel/cgroup/cgroup.c:948 cgroup_post_fork+0x201/0x9e0 kernel/cgroup/cgroup.c:6910 copy_process+0x56b6/0x7430 kernel/fork.c:2465 kernel_clone+0xfc/0x910 kernel/fork.c:2651 user_mode_thread+0xc8/0x110 kernel/fork.c:2727 rest_init+0x23/0x2b0 init/main.c:722 start_kernel+0x3ef/0x4d0 init/main.c:1206 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:310 x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:291 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:557 [inline] try_to_wake_up+0xb7/0x1860 kernel/sched/core.c:4106 __wake_up_common+0x135/0x1f0 kernel/sched/wait.c:108 __wake_up_common_lock kernel/sched/wait.c:125 [inline] __wake_up+0x31/0x60 kernel/sched/wait.c:146 tty_port_default_wakeup+0x4d/0x60 drivers/tty/tty_port.c:67 serial8250_tx_chars+0x68e/0x860 drivers/tty/serial/8250/8250_port.c:1719 serial8250_handle_irq+0x761/0xcb0 drivers/tty/serial/8250/8250_port.c:1827 serial8250_default_handle_irq+0x9e/0x270 drivers/tty/serial/8250/8250_port.c:1846 serial8250_interrupt+0xf8/0x1d0 drivers/tty/serial/8250/8250_core.c:86 __handle_irq_event_percpu+0x236/0x890 kernel/irq/handle.c:211 handle_irq_event_percpu kernel/irq/handle.c:248 [inline] handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:265 handle_edge_irq+0x3ca/0x9e0 kernel/irq/chip.c:855 generic_handle_irq_desc include/linux/irqdesc.h:172 [inline] handle_irq arch/x86/kernel/irq.c:255 [inline] call_irq_handler arch/x86/kernel/irq.c:311 [inline] __common_interrupt+0xd0/0x2f0 arch/x86/kernel/irq.c:326 common_interrupt+0x61/0xe0 arch/x86/kernel/irq.c:319 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688 variable_ffs arch/x86/include/asm/bitops.h:312 [inline] handle_softirqs+0x1dd/0x950 kernel/softirq.c:610 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202 spin_unlock_irq include/linux/spinlock.h:401 [inline] __rpm_callback+0x1e2/0x610 drivers/base/power/runtime.c:383 rpm_callback+0x1b7/0x200 drivers/base/power/runtime.c:460 rpm_resume+0xceb/0x12f0 drivers/base/power/runtime.c:939 pm_runtime_work+0x10c/0x150 drivers/base/power/runtime.c:1004 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 -> #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:124 [inline] __wake_up+0x1c/0x60 kernel/sched/wait.c:146 tty_port_default_wakeup+0x4d/0x60 drivers/tty/tty_port.c:67 serial8250_tx_chars+0x68e/0x860 drivers/tty/serial/8250/8250_port.c:1719 serial8250_handle_irq+0x761/0xcb0 drivers/tty/serial/8250/8250_port.c:1827 serial8250_default_handle_irq+0x9e/0x270 drivers/tty/serial/8250/8250_port.c:1846 serial8250_interrupt+0xf8/0x1d0 drivers/tty/serial/8250/8250_core.c:86 __handle_irq_event_percpu+0x236/0x890 kernel/irq/handle.c:211 handle_irq_event_percpu kernel/irq/handle.c:248 [inline] handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:265 handle_edge_irq+0x3ca/0x9e0 kernel/irq/chip.c:855 generic_handle_irq_desc include/linux/irqdesc.h:172 [inline] handle_irq arch/x86/kernel/irq.c:255 [inline] call_irq_handler arch/x86/kernel/irq.c:311 [inline] __common_interrupt+0xd0/0x2f0 arch/x86/kernel/irq.c:326 common_interrupt+0xba/0xe0 arch/x86/kernel/irq.c:319 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688 __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:788 [inline] uart_port_unlock_deref drivers/tty/serial/serial_core.c:91 [inline] uart_port_unlock_deref drivers/tty/serial/serial_core.c:88 [inline] uart_write+0x2a4/0xb30 drivers/tty/serial/serial_core.c:634 process_output_block drivers/tty/n_tty.c:557 [inline] n_tty_write+0x434/0x1280 drivers/tty/n_tty.c:2366 iterate_tty_write drivers/tty/tty_io.c:1006 [inline] file_tty_write.constprop.0+0x503/0x9b0 drivers/tty/tty_io.c:1081 tty_write drivers/tty/tty_io.c:1102 [inline] redirected_tty_write drivers/tty/tty_io.c:1125 [inline] redirected_tty_write+0xd4/0x120 drivers/tty/tty_io.c:1105 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x7d3/0x11d0 fs/read_write.c:686 ksys_write+0x12a/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 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:717 [inline] serial8250_console_write+0x181/0x1890 drivers/tty/serial/8250/8250_port.c:3301 console_emit_next_record kernel/printk/printk.c:3129 [inline] console_flush_one_record+0x796/0xc60 kernel/printk/printk.c:3215 console_flush_all kernel/printk/printk.c:3289 [inline] __console_flush_and_unlock kernel/printk/printk.c:3319 [inline] console_unlock+0xef/0x240 kernel/printk/printk.c:3359 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2426 _printk+0xc7/0x100 kernel/printk/printk.c:2451 register_console+0x823/0x1210 kernel/printk/printk.c:4170 univ8250_console_init+0x5f/0x90 drivers/tty/serial/8250/8250_core.c:515 console_init+0x152/0x600 kernel/printk/printk.c:4369 start_kernel+0x298/0x4d0 init/main.c:1143 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:310 x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:291 common_startup_64+0x13e/0x148 -> #0 (console_owner){-.-.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x1669/0x2890 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825 console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1900 console_emit_next_record kernel/printk/printk.c:3123 [inline] console_flush_one_record+0x73f/0xc60 kernel/printk/printk.c:3215 console_flush_all kernel/printk/printk.c:3289 [inline] __console_flush_and_unlock kernel/printk/printk.c:3319 [inline] console_unlock+0xef/0x240 kernel/printk/printk.c:3359 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2426 _printk+0xc7/0x100 kernel/printk/printk.c:2451 fail_dump lib/fault-inject.c:66 [inline] should_fail_ex+0x4e7/0x640 lib/fault-inject.c:174 strncpy_from_user+0x3b/0x2e0 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x7f/0x180 mm/maccess.c:192 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:214 [inline] ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:223 [inline] bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:220 bpf_prog_c762caf419d1c004+0x3e/0x44 bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline] __bpf_prog_run include/linux/filter.h:723 [inline] bpf_prog_run include/linux/filter.h:730 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline] bpf_trace_run4+0x252/0x5e0 kernel/trace/bpf_trace.c:2118 __bpf_trace_sched_switch+0x145/0x190 include/trace/events/sched.h:220 __traceiter_sched_switch+0x6f/0xc0 include/trace/events/sched.h:220 __do_trace_sched_switch include/trace/events/sched.h:220 [inline] trace_sched_switch include/trace/events/sched.h:220 [inline] __schedule+0x1a1b/0x5ee0 kernel/sched/core.c:6864 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7194 irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 arch_atomic64_add_negative arch/x86/include/asm/atomic64_64.h:73 [inline] raw_atomic64_add_negative include/linux/atomic/atomic-arch-fallback.h:4445 [inline] raw_atomic_long_add_negative include/linux/atomic/atomic-long.h:1612 [inline] atomic_long_add_negative include/linux/atomic/atomic-instrumented.h:4577 [inline] file_ref_get include/linux/file_ref.h:108 [inline] __fget_files_rcu fs/file.c:1048 [inline] __fget_files+0x125/0x3c0 fs/file.c:1094 __fget_light fs/file.c:1196 [inline] fdget+0x1a9/0x210 fs/file.c:1204 class_fd_constructor include/linux/file.h:83 [inline] do_fsync+0x14/0xa0 fs/sync.c:208 __do_sys_fsync fs/sync.c:218 [inline] __se_sys_fsync fs/sync.c:216 [inline] __x64_sys_fsync+0x32/0x50 fs/sync.c:216 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 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 *** 5 locks held by syz.4.245/7149: #0: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline] #0: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: __fget_files+0x34/0x3c0 fs/file.c:1093 #1: ffff8880b853add8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:639 #2: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #2: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline] #2: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2074 [inline] #2: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run4+0x1d5/0x5e0 kernel/trace/bpf_trace.c:2118 #3: ffffffff8e3b7000 (console_lock){+.+.}-{0:0}, at: _printk+0xc7/0x100 kernel/printk/printk.c:2451 #4: ffffffff8e3b7078 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:336 [inline] #4: ffffffff8e3b7078 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:409 [inline] #4: ffffffff8e3b7078 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:289 [inline] #4: ffffffff8e3b7078 (console_srcu){....}-{0:0}, at: console_flush_one_record+0x103/0xc60 kernel/printk/printk.c:3192 stack backtrace: CPU: 1 UID: 0 PID: 7149 Comm: syz.4.245 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x275/0x340 kernel/locking/lockdep.c:2043 check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x1669/0x2890 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825 console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1900 console_emit_next_record kernel/printk/printk.c:3123 [inline] console_flush_one_record+0x73f/0xc60 kernel/printk/printk.c:3215 console_flush_all kernel/printk/printk.c:3289 [inline] __console_flush_and_unlock kernel/printk/printk.c:3319 [inline] console_unlock+0xef/0x240 kernel/printk/printk.c:3359 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2426 _printk+0xc7/0x100 kernel/printk/printk.c:2451 fail_dump lib/fault-inject.c:66 [inline] should_fail_ex+0x4e7/0x640 lib/fault-inject.c:174 strncpy_from_user+0x3b/0x2e0 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x7f/0x180 mm/maccess.c:192 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:214 [inline] ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:223 [inline] bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:220 bpf_prog_c762caf419d1c004+0x3e/0x44 bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline] __bpf_prog_run include/linux/filter.h:723 [inline] bpf_prog_run include/linux/filter.h:730 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline] bpf_trace_run4+0x252/0x5e0 kernel/trace/bpf_trace.c:2118 __bpf_trace_sched_switch+0x145/0x190 include/trace/events/sched.h:220 __traceiter_sched_switch+0x6f/0xc0 include/trace/events/sched.h:220 __do_trace_sched_switch include/trace/events/sched.h:220 [inline] trace_sched_switch include/trace/events/sched.h:220 [inline] __schedule+0x1a1b/0x5ee0 kernel/sched/core.c:6864 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7194 irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:arch_atomic64_add_negative arch/x86/include/asm/atomic64_64.h:73 [inline] RIP: 0010:raw_atomic64_add_negative include/linux/atomic/atomic-arch-fallback.h:4445 [inline] RIP: 0010:raw_atomic_long_add_negative include/linux/atomic/atomic-long.h:1612 [inline] RIP: 0010:atomic_long_add_negative include/linux/atomic/atomic-instrumented.h:4577 [inline] RIP: 0010:file_ref_get include/linux/file_ref.h:108 [inline] RIP: 0010:__fget_files_rcu fs/file.c:1048 [inline] RIP: 0010:__fget_files+0x125/0x3c0 fs/file.c:1094 Code: 8b 1f 48 21 c3 0f 84 3f 02 00 00 e8 85 5d 7a ff 48 8d bb 60 01 00 00 be 08 00 00 00 e8 c4 4c e3 ff f0 48 83 83 60 01 00 00 01 <0f> 98 c0 31 ff 89 c6 88 04 24 e8 9c 57 7a ff 0f b6 04 24 84 c0 0f RSP: 0018:ffffc90003e9fe68 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffff88802efcae00 RCX: ffffffff824491bc RDX: ffffed1005df95ed RSI: 0000000000000008 RDI: ffff88802efcaf60 RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffed1005df95ec R10: ffff88802efcaf67 R11: ffff88802c0466b0 R12: ffff888034844b40 R13: 0000000000000006 R14: ffff888078d9ce80 R15: ffff8880444fb030 __fget_light fs/file.c:1196 [inline] fdget+0x1a9/0x210 fs/file.c:1204 class_fd_constructor include/linux/file.h:83 [inline] do_fsync+0x14/0xa0 fs/sync.c:208 __do_sys_fsync fs/sync.c:218 [inline] __se_sys_fsync fs/sync.c:216 [inline] __x64_sys_fsync+0x32/0x50 fs/sync.c:216 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0e1d98f749 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0e1e74b038 EFLAGS: 00000246 ORIG_RAX: 000000000000004a RAX: ffffffffffffffda RBX: 00007f0e1dbe6180 RCX: 00007f0e1d98f749 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 RBP: 00007f0e1e74b090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007f0e1dbe6218 R14: 00007f0e1dbe6180 R15: 00007fff750b1128 CPU: 1 UID: 0 PID: 7149 Comm: syz.4.245 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 fail_dump lib/fault-inject.c:73 [inline] should_fail_ex+0x512/0x640 lib/fault-inject.c:174 strncpy_from_user+0x3b/0x2e0 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x7f/0x180 mm/maccess.c:192 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:214 [inline] ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:223 [inline] bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:220 bpf_prog_c762caf419d1c004+0x3e/0x44 bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline] __bpf_prog_run include/linux/filter.h:723 [inline] bpf_prog_run include/linux/filter.h:730 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline] bpf_trace_run4+0x252/0x5e0 kernel/trace/bpf_trace.c:2118 __bpf_trace_sched_switch+0x145/0x190 include/trace/events/sched.h:220 __traceiter_sched_switch+0x6f/0xc0 include/trace/events/sched.h:220 __do_trace_sched_switch include/trace/events/sched.h:220 [inline] trace_sched_switch include/trace/events/sched.h:220 [inline] __schedule+0x1a1b/0x5ee0 kernel/sched/core.c:6864 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7194 irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:arch_atomic64_add_negative arch/x86/include/asm/atomic64_64.h:73 [inline] RIP: 0010:raw_atomic64_add_negative include/linux/atomic/atomic-arch-fallback.h:4445 [inline] RIP: 0010:raw_atomic_long_add_negative include/linux/atomic/atomic-long.h:1612 [inline] RIP: 0010:atomic_long_add_negative include/linux/atomic/atomic-instrumented.h:4577 [inline] RIP: 0010:file_ref_get include/linux/file_ref.h:108 [inline] RIP: 0010:__fget_files_rcu fs/file.c:1048 [inline] RIP: 0010:__fget_files+0x125/0x3c0 fs/file.c:1094 Code: 8b 1f 48 21 c3 0f 84 3f 02 00 00 e8 85 5d 7a ff 48 8d bb 60 01 00 00 be 08 00 00 00 e8 c4 4c e3 ff f0 48 83 83 60 01 00 00 01 <0f> 98 c0 31 ff 89 c6 88 04 24 e8 9c 57 7a ff 0f b6 04 24 84 c0 0f RSP: 0018:ffffc90003e9fe68 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffff88802efcae00 RCX: ffffffff824491bc RDX: ffffed1005df95ed RSI: 0000000000000008 RDI: ffff88802efcaf60 RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffed1005df95ec R10: ffff88802efcaf67 R11: ffff88802c0466b0 R12: ffff888034844b40 R13: 0000000000000006 R14: ffff888078d9ce80 R15: ffff8880444fb030 __fget_light fs/file.c:1196 [inline] fdget+0x1a9/0x210 fs/file.c:1204 class_fd_constructor include/linux/file.h:83 [inline] do_fsync+0x14/0xa0 fs/sync.c:208 __do_sys_fsync fs/sync.c:218 [inline] __se_sys_fsync fs/sync.c:216 [inline] __x64_sys_fsync+0x32/0x50 fs/sync.c:216 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0e1d98f749 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0e1e74b038 EFLAGS: 00000246 ORIG_RAX: 000000000000004a RAX: ffffffffffffffda RBX: 00007f0e1dbe6180 RCX: 00007f0e1d98f749 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 RBP: 00007f0e1e74b090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007f0e1dbe6218 R14: 00007f0e1dbe6180 R15: 00007fff750b1128 ---------------- Code disassembly (best guess): 0: 8b 1f mov (%rdi),%ebx 2: 48 21 c3 and %rax,%rbx 5: 0f 84 3f 02 00 00 je 0x24a b: e8 85 5d 7a ff call 0xff7a5d95 10: 48 8d bb 60 01 00 00 lea 0x160(%rbx),%rdi 17: be 08 00 00 00 mov $0x8,%esi 1c: e8 c4 4c e3 ff call 0xffe34ce5 21: f0 48 83 83 60 01 00 lock addq $0x1,0x160(%rbx) 28: 00 01 * 2a: 0f 98 c0 sets %al <-- trapping instruction 2d: 31 ff xor %edi,%edi 2f: 89 c6 mov %eax,%esi 31: 88 04 24 mov %al,(%rsp) 34: e8 9c 57 7a ff call 0xff7a57d5 39: 0f b6 04 24 movzbl (%rsp),%eax 3d: 84 c0 test %al,%al 3f: 0f .byte 0xf