FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 ====================================================== WARNING: possible circular locking dependency detected 6.16.0-rc1-syzkaller-gfda589c28604 #0 Not tainted ------------------------------------------------------ syz.1.1341/9481 is trying to acquire lock: ffffffff882e8980 (console_owner){-.-.}-{0:0}, at: console_lock_spinning_enable+0x9a/0xd6 kernel/printk/printk.c:1920 but task is already holding lock: ffffaf806ed5d0d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:606 [inline] ffffaf806ed5d0d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1532 [inline] ffffaf806ed5d0d8 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1856 [inline] ffffaf806ed5d0d8 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x304/0x4094 kernel/sched/core.c:6709 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&rq->__lock){-.-.}-{2:2}: lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x1ac/0x448 kernel/locking/lockdep.c:5828 _raw_spin_lock_nested+0x36/0x4e kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested kernel/sched/core.c:606 [inline] raw_spin_rq_lock kernel/sched/sched.h:1532 [inline] task_rq_lock+0xea/0x3be kernel/sched/core.c:708 cgroup_move_task+0x8a/0x222 kernel/sched/psi.c:1161 css_set_move_task+0x20e/0x48c kernel/cgroup/cgroup.c:918 cgroup_post_fork+0x16c/0x816 kernel/cgroup/cgroup.c:6754 copy_process+0x6644/0x716a kernel/fork.c:2413 kernel_clone+0x128/0xc9e kernel/fork.c:2599 user_mode_thread+0xd4/0x110 kernel/fork.c:2677 rest_init+0x34/0x2e6 init/main.c:709 console_on_rootfs+0x0/0x96 init/main.c:1101 -> #3 (&p->pi_lock){-.-.}-{2:2}: lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x1ac/0x448 kernel/locking/lockdep.c:5828 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3e/0x62 kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:557 [inline] try_to_wake_up+0xb8/0x1036 kernel/sched/core.c:4226 default_wake_function+0x30/0x58 kernel/sched/core.c:7120 woken_wake_function+0x38/0x64 kernel/sched/wait.c:444 __wake_up_common+0x106/0x184 kernel/sched/wait.c:89 __wake_up_common_lock kernel/sched/wait.c:106 [inline] __wake_up+0x32/0x58 kernel/sched/wait.c:127 tty_wakeup+0x60/0xfc drivers/tty/tty_io.c:519 tty_port_default_wakeup+0x2c/0x44 drivers/tty/tty_port.c:69 tty_port_tty_wakeup+0x52/0x72 drivers/tty/tty_port.c:415 uart_write_wakeup+0x40/0x5e drivers/tty/serial/serial_core.c:121 serial8250_tx_chars+0x5f8/0x7a6 drivers/tty/serial/8250/8250_port.c:1838 serial8250_handle_irq+0x676/0xb34 drivers/tty/serial/8250/8250_port.c:1946 serial8250_default_handle_irq+0x8c/0x1c6 drivers/tty/serial/8250/8250_port.c:1966 serial8250_interrupt+0xda/0x1ee drivers/tty/serial/8250/8250_core.c:86 __handle_irq_event_percpu+0x25a/0xaa4 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0xb4/0x1ea kernel/irq/handle.c:210 handle_fasteoi_irq+0x31a/0xd44 kernel/irq/chip.c:698 generic_handle_irq_desc include/linux/irqdesc.h:173 [inline] handle_irq_desc+0xfc/0x140 kernel/irq/irqdesc.c:676 generic_handle_domain_irq+0x2a/0x36 kernel/irq/irqdesc.c:732 plic_handle_irq+0x17a/0x3c8 drivers/irqchip/irq-sifive-plic.c:386 generic_handle_irq_desc include/linux/irqdesc.h:173 [inline] handle_irq_desc+0xfc/0x140 kernel/irq/irqdesc.c:676 generic_handle_domain_irq+0x2a/0x36 kernel/irq/irqdesc.c:732 riscv_intc_irq+0x4a/0xcc drivers/irqchip/irq-riscv-intc.c:33 handle_riscv_irq+0x2e/0x4c arch/riscv/kernel/traps.c:386 call_on_irq_stack+0x32/0x40 arch/riscv/kernel/entry.S:360 -> #2 (&tty->write_wait){-.-.}-{3:3}: lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x1ac/0x448 kernel/locking/lockdep.c:5828 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3e/0x62 kernel/locking/spinlock.c:162 __wake_up_common_lock kernel/sched/wait.c:105 [inline] __wake_up+0x22/0x58 kernel/sched/wait.c:127 tty_wakeup+0x60/0xfc drivers/tty/tty_io.c:519 tty_port_default_wakeup+0x2c/0x44 drivers/tty/tty_port.c:69 tty_port_tty_wakeup+0x52/0x72 drivers/tty/tty_port.c:415 uart_write_wakeup+0x40/0x5e drivers/tty/serial/serial_core.c:121 serial8250_tx_chars+0x5f8/0x7a6 drivers/tty/serial/8250/8250_port.c:1838 serial8250_handle_irq+0x676/0xb34 drivers/tty/serial/8250/8250_port.c:1946 serial8250_default_handle_irq+0x8c/0x1c6 drivers/tty/serial/8250/8250_port.c:1966 serial8250_interrupt+0xda/0x1ee drivers/tty/serial/8250/8250_core.c:86 __handle_irq_event_percpu+0x25a/0xaa4 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0xb4/0x1ea kernel/irq/handle.c:210 handle_fasteoi_irq+0x31a/0xd44 kernel/irq/chip.c:698 generic_handle_irq_desc include/linux/irqdesc.h:173 [inline] handle_irq_desc+0xfc/0x140 kernel/irq/irqdesc.c:676 generic_handle_domain_irq+0x2a/0x36 kernel/irq/irqdesc.c:732 plic_handle_irq+0x17a/0x3c8 drivers/irqchip/irq-sifive-plic.c:386 generic_handle_irq_desc include/linux/irqdesc.h:173 [inline] handle_irq_desc+0xfc/0x140 kernel/irq/irqdesc.c:676 generic_handle_domain_irq+0x2a/0x36 kernel/irq/irqdesc.c:732 riscv_intc_irq+0x4a/0xcc drivers/irqchip/irq-riscv-intc.c:33 handle_riscv_irq+0x2e/0x4c arch/riscv/kernel/traps.c:386 call_on_irq_stack+0x32/0x40 arch/riscv/kernel/entry.S:360 -> #1 (&port_lock_key){-.-.}-{3:3}: lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x1ac/0x448 kernel/locking/lockdep.c:5828 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3e/0x62 kernel/locking/spinlock.c:162 uart_port_lock_irqsave include/linux/serial_core.h:717 [inline] serial8250_console_write+0x19a/0x182e drivers/tty/serial/8250/8250_port.c:3415 univ8250_console_write+0x70/0x9c drivers/tty/serial/8250/8250_core.c:396 console_emit_next_record kernel/printk/printk.c:3138 [inline] console_flush_all+0x7ae/0xb62 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0x108/0x22e kernel/printk/printk.c:3325 vprintk_emit+0x476/0x780 kernel/printk/printk.c:2450 vprintk_default+0x26/0x32 kernel/printk/printk.c:2465 vprintk+0x20/0x2c kernel/printk/printk_safe.c:82 _printk+0x98/0xc4 kernel/printk/printk.c:2475 register_console+0xa0a/0x1078 kernel/printk/printk.c:4125 uart_configure_port drivers/tty/serial/serial_core.c:2637 [inline] serial_core_add_one_port drivers/tty/serial/serial_core.c:3157 [inline] serial_core_register_port+0x21e4/0x22aa drivers/tty/serial/serial_core.c:3388 serial_ctrl_register_port+0x20/0x2c drivers/tty/serial/serial_ctrl.c:41 uart_add_one_port+0x20/0x2c drivers/tty/serial/serial_port.c:143 serial8250_register_8250_port+0x12cc/0x203a drivers/tty/serial/8250/8250_core.c:822 of_platform_serial_probe+0x724/0xb42 drivers/tty/serial/8250/8250_of.c:246 platform_probe+0xfa/0x1e8 drivers/base/platform.c:1404 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x232/0x9be drivers/base/dd.c:657 __driver_probe_device+0x1d4/0x3f2 drivers/base/dd.c:799 driver_probe_device+0x60/0x1ce drivers/base/dd.c:829 __driver_attach+0x250/0x4ee drivers/base/dd.c:1215 bus_for_each_dev+0x124/0x1ba drivers/base/bus.c:370 driver_attach+0x3e/0x52 drivers/base/dd.c:1233 bus_add_driver+0x29e/0x5e6 drivers/base/bus.c:678 driver_register+0x18e/0x3ee drivers/base/driver.c:249 __platform_driver_register+0x5e/0x7e drivers/base/platform.c:867 of_platform_serial_driver_init+0x22/0x2a drivers/tty/serial/8250/8250_of.c:370 do_one_initcall+0x1a2/0xae4 init/main.c:1273 do_initcall_level init/main.c:1335 [inline] do_initcalls init/main.c:1351 [inline] do_basic_setup init/main.c:1370 [inline] kernel_init_freeable+0x6e4/0x78c init/main.c:1583 kernel_init+0x28/0x24c init/main.c:1473 ret_from_fork_kernel+0x2a/0xbb2 arch/riscv/kernel/process.c:214 ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:327 -> #0 (console_owner){-.-.}-{0:0}: check_noncircular+0x132/0x146 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain kernel/locking/lockdep.c:3911 [inline] __lock_acquire+0x12b2/0x24ea kernel/locking/lockdep.c:5240 lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x1ac/0x448 kernel/locking/lockdep.c:5828 console_lock_spinning_enable+0xc0/0xd6 kernel/printk/printk.c:1924 console_emit_next_record kernel/printk/printk.c:3132 [inline] console_flush_all+0x764/0xb62 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0x108/0x22e kernel/printk/printk.c:3325 vprintk_emit+0x476/0x780 kernel/printk/printk.c:2450 vprintk_default+0x26/0x32 kernel/printk/printk.c:2465 vprintk+0x20/0x2c kernel/printk/printk_safe.c:82 _printk+0x98/0xc4 kernel/printk/printk.c:2475 fail_dump lib/fault-inject.c:66 [inline] should_fail_ex+0x46a/0x5cc lib/fault-inject.c:174 should_fail+0xe/0x16 lib/fault-inject.c:184 should_fail_usercopy+0x1e/0x26 lib/fault-inject-usercopy.c:37 strncpy_from_user+0xa8/0x7a0 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x86/0x174 mm/maccess.c:193 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:215 [inline] ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:224 [inline] bpf_probe_read_user_str+0x2a/0x62 kernel/trace/bpf_trace.c:221 bpf_prog_bc7c5c6b9645592f+0x46/0x56 bpf_dispatcher_nop_func include/linux/bpf.h:1322 [inline] __bpf_prog_run include/linux/filter.h:718 [inline] bpf_prog_run include/linux/filter.h:725 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2258 [inline] bpf_trace_run4+0x298/0x6f0 kernel/trace/bpf_trace.c:2301 __bpf_trace_sched_switch+0x14/0x1c include/trace/events/sched.h:220 __traceiter_sched_switch include/trace/events/sched.h:220 [inline] __do_trace_sched_switch include/trace/events/sched.h:220 [inline] trace_sched_switch include/trace/events/sched.h:220 [inline] __schedule+0x132e/0x4094 kernel/sched/core.c:6782 __schedule_loop kernel/sched/core.c:6863 [inline] schedule+0xc4/0x35e kernel/sched/core.c:6878 sigsuspend+0x1fe/0x2e2 kernel/signal.c:4836 __do_sys_rt_sigsuspend kernel/signal.c:4858 [inline] __se_sys_rt_sigsuspend kernel/signal.c:4848 [inline] __riscv_sys_rt_sigsuspend+0xf8/0x15a kernel/signal.c:4848 syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:112 do_trap_ecall_u+0x396/0x530 arch/riscv/kernel/traps.c:341 handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197 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 *** 4 locks held by syz.1.1341/9481: #0: ffffaf806ed5d0d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:606 [inline] #0: ffffaf806ed5d0d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1532 [inline] #0: ffffaf806ed5d0d8 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1856 [inline] #0: ffffaf806ed5d0d8 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x304/0x4094 kernel/sched/core.c:6709 #1: ffffffff883dc420 (rcu_read_lock){....}-{1:3}, at: bpf_set_run_ctx include/linux/bpf.h:2193 [inline] #1: ffffffff883dc420 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2255 [inline] #1: ffffffff883dc420 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run4+0x1fc/0x6f0 kernel/trace/bpf_trace.c:2301 #2: ffffffff882e8580 (console_lock){+.+.}-{0:0}, at: vprintk_default+0x26/0x32 kernel/printk/printk.c:2465 #3: ffffffff882e86d0 (console_srcu){....}-{0:0}, at: console_flush_all+0x114/0xb62 kernel/printk/printk.c:3234 stack backtrace: CPU: 1 UID: 0 PID: 9481 Comm: syz.1.1341 Not tainted 6.16.0-rc1-syzkaller-gfda589c28604 #0 PREEMPT Hardware name: riscv-virtio,qemu (DT) Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:132 [] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:138 [] __dump_stack lib/dump_stack.c:94 [inline] [] dump_stack_lvl+0x12e/0x1a6 lib/dump_stack.c:120 [] dump_stack+0x1c/0x24 lib/dump_stack.c:129 [] print_circular_bug+0x254/0x29a kernel/locking/lockdep.c:2046 [] check_noncircular+0x132/0x146 kernel/locking/lockdep.c:2178 [] check_prev_add kernel/locking/lockdep.c:3168 [inline] [] check_prevs_add kernel/locking/lockdep.c:3287 [inline] [] validate_chain kernel/locking/lockdep.c:3911 [inline] [] __lock_acquire+0x12b2/0x24ea kernel/locking/lockdep.c:5240 [] lock_acquire kernel/locking/lockdep.c:5871 [inline] [] lock_acquire+0x1ac/0x448 kernel/locking/lockdep.c:5828 [] console_lock_spinning_enable+0xc0/0xd6 kernel/printk/printk.c:1924 [] console_emit_next_record kernel/printk/printk.c:3132 [inline] [] console_flush_all+0x764/0xb62 kernel/printk/printk.c:3226 [] __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] [] console_unlock+0x108/0x22e kernel/printk/printk.c:3325 [] vprintk_emit+0x476/0x780 kernel/printk/printk.c:2450 [] vprintk_default+0x26/0x32 kernel/printk/printk.c:2465 [] vprintk+0x20/0x2c kernel/printk/printk_safe.c:82 [] _printk+0x98/0xc4 kernel/printk/printk.c:2475 [] fail_dump lib/fault-inject.c:66 [inline] [] should_fail_ex+0x46a/0x5cc lib/fault-inject.c:174 [] should_fail+0xe/0x16 lib/fault-inject.c:184 [] should_fail_usercopy+0x1e/0x26 lib/fault-inject-usercopy.c:37 [] strncpy_from_user+0xa8/0x7a0 lib/strncpy_from_user.c:118 [] strncpy_from_user_nofault+0x86/0x174 mm/maccess.c:193 [] bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:215 [inline] [] ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:224 [inline] [] bpf_probe_read_user_str+0x2a/0x62 kernel/trace/bpf_trace.c:221 [] bpf_prog_bc7c5c6b9645592f+0x46/0x56 [] bpf_dispatcher_nop_func include/linux/bpf.h:1322 [inline] [] __bpf_prog_run include/linux/filter.h:718 [inline] [] bpf_prog_run include/linux/filter.h:725 [inline] [] __bpf_trace_run kernel/trace/bpf_trace.c:2258 [inline] [] bpf_trace_run4+0x298/0x6f0 kernel/trace/bpf_trace.c:2301 [] __bpf_trace_sched_switch+0x14/0x1c include/trace/events/sched.h:220 [] __traceiter_sched_switch include/trace/events/sched.h:220 [inline] [] __do_trace_sched_switch include/trace/events/sched.h:220 [inline] [] trace_sched_switch include/trace/events/sched.h:220 [inline] [] __schedule+0x132e/0x4094 kernel/sched/core.c:6782 [] __schedule_loop kernel/sched/core.c:6863 [inline] [] schedule+0xc4/0x35e kernel/sched/core.c:6878 [] sigsuspend+0x1fe/0x2e2 kernel/signal.c:4836 [] __do_sys_rt_sigsuspend kernel/signal.c:4858 [inline] [] __se_sys_rt_sigsuspend kernel/signal.c:4848 [inline] [] __riscv_sys_rt_sigsuspend+0xf8/0x15a kernel/signal.c:4848 [] syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:112 [] do_trap_ecall_u+0x396/0x530 arch/riscv/kernel/traps.c:341 [] handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197 CPU: 1 UID: 0 PID: 9481 Comm: syz.1.1341 Not tainted 6.16.0-rc1-syzkaller-gfda589c28604 #0 PREEMPT Hardware name: riscv-virtio,qemu (DT) Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:132 [] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:138 [] __dump_stack lib/dump_stack.c:94 [inline] [] dump_stack_lvl+0x12e/0x1a6 lib/dump_stack.c:120 [] dump_stack+0x1c/0x24 lib/dump_stack.c:129 [] fail_dump lib/fault-inject.c:73 [inline] [] should_fail_ex+0x48c/0x5cc lib/fault-inject.c:174 [] should_fail+0xe/0x16 lib/fault-inject.c:184 [] should_fail_usercopy+0x1e/0x26 lib/fault-inject-usercopy.c:37 [] strncpy_from_user+0xa8/0x7a0 lib/strncpy_from_user.c:118 [] strncpy_from_user_nofault+0x86/0x174 mm/maccess.c:193 [] bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:215 [inline] [] ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:224 [inline] [] bpf_probe_read_user_str+0x2a/0x62 kernel/trace/bpf_trace.c:221 [] bpf_prog_bc7c5c6b9645592f+0x46/0x56 [] bpf_dispatcher_nop_func include/linux/bpf.h:1322 [inline] [] __bpf_prog_run include/linux/filter.h:718 [inline] [] bpf_prog_run include/linux/filter.h:725 [inline] [] __bpf_trace_run kernel/trace/bpf_trace.c:2258 [inline] [] bpf_trace_run4+0x298/0x6f0 kernel/trace/bpf_trace.c:2301 [] __bpf_trace_sched_switch+0x14/0x1c include/trace/events/sched.h:220 [] __traceiter_sched_switch include/trace/events/sched.h:220 [inline] [] __do_trace_sched_switch include/trace/events/sched.h:220 [inline] [] trace_sched_switch include/trace/events/sched.h:220 [inline] [] __schedule+0x132e/0x4094 kernel/sched/core.c:6782 [] __schedule_loop kernel/sched/core.c:6863 [inline] [] schedule+0xc4/0x35e kernel/sched/core.c:6878 [] sigsuspend+0x1fe/0x2e2 kernel/signal.c:4836 [] __do_sys_rt_sigsuspend kernel/signal.c:4858 [inline] [] __se_sys_rt_sigsuspend kernel/signal.c:4848 [inline] [] __riscv_sys_rt_sigsuspend+0xf8/0x15a kernel/signal.c:4848 [] syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:112 [] do_trap_ecall_u+0x396/0x530 arch/riscv/kernel/traps.c:341 [] handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197