Unable to handle kernel paging request at virtual address ffffffff8011115c ====================================================== WARNING: possible circular locking dependency detected 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Not tainted ------------------------------------------------------ sshd/2022 is trying to acquire lock: ffffffff84a888e0 (console_owner){-...}-{0:0}, at: console_unlock+0x2b2/0x97a kernel/printk/printk.c:2707 but task is already holding lock: ffffaf805a9e7418 (hrtimer_bases.lock){-.-.}-{2:2}, at: __run_hrtimer kernel/time/hrtimer.c:1689 [inline] ffffaf805a9e7418 (hrtimer_bases.lock){-.-.}-{2:2}, at: __hrtimer_run_queues+0x262/0xa16 kernel/time/hrtimer.c:1749 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #6 (hrtimer_bases.lock){-.-.}-{2:2}: lock_acquire.part.0+0x1d0/0x424 kernel/locking/lockdep.c:5639 lock_acquire+0x54/0x6a kernel/locking/lockdep.c:5612 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3e/0x62 kernel/locking/spinlock.c:162 lock_hrtimer_base kernel/time/hrtimer.c:173 [inline] hrtimer_start_range_ns+0x9e/0x6dc kernel/time/hrtimer.c:1296 hrtimer_start_expires include/linux/hrtimer.h:432 [inline] do_start_rt_bandwidth kernel/sched/rt.c:69 [inline] start_rt_bandwidth kernel/sched/rt.c:80 [inline] inc_rt_group kernel/sched/rt.c:1208 [inline] inc_rt_tasks kernel/sched/rt.c:1252 [inline] __enqueue_rt_entity kernel/sched/rt.c:1428 [inline] enqueue_rt_entity kernel/sched/rt.c:1474 [inline] enqueue_task_rt+0x520/0x568 kernel/sched/rt.c:1509 enqueue_task+0x66/0x136 kernel/sched/core.c:2010 __sched_setscheduler.constprop.0+0x704/0xdd4 kernel/sched/core.c:7475 _sched_setscheduler kernel/sched/core.c:7521 [inline] sched_setscheduler_nocheck kernel/sched/core.c:7568 [inline] sched_set_fifo+0xc8/0x108 kernel/sched/core.c:7592 drm_vblank_worker_init+0xea/0x10c drivers/gpu/drm/drm_vblank_work.c:263 drm_vblank_init+0xec/0x24e drivers/gpu/drm/drm_vblank.c:551 vkms_create drivers/gpu/drm/vkms/vkms_drv.c:194 [inline] vkms_init+0x272/0x45c drivers/gpu/drm/vkms/vkms_drv.c:233 do_one_initcall+0x13a/0x7ea init/main.c:1300 do_initcall_level init/main.c:1373 [inline] do_initcalls init/main.c:1389 [inline] do_basic_setup init/main.c:1408 [inline] kernel_init_freeable+0x510/0x5b4 init/main.c:1613 kernel_init+0x28/0x21c init/main.c:1502 ret_from_exception+0x0/0x10 -> #5 (&rt_b->rt_runtime_lock){-...}-{2:2}: lock_acquire.part.0+0x1d0/0x424 kernel/locking/lockdep.c:5639 lock_acquire+0x54/0x6a kernel/locking/lockdep.c:5612 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x32/0x48 kernel/locking/spinlock.c:154 __enable_runtime kernel/sched/rt.c:840 [inline] rq_online_rt+0x78/0x1b8 kernel/sched/rt.c:2431 set_rq_online.part.0+0xaa/0xc2 kernel/sched/core.c:8965 set_rq_online kernel/sched/core.c:9075 [inline] sched_cpu_activate+0x1c0/0x250 kernel/sched/core.c:9070 cpuhp_invoke_callback+0x282/0x504 kernel/cpu.c:191 cpuhp_thread_fun+0x2f6/0x4b0 kernel/cpu.c:791 smpboot_thread_fn+0x448/0x6cc kernel/smpboot.c:164 kthread+0x19e/0x1fa kernel/kthread.c:377 ret_from_exception+0x0/0x10 -> #4 (&rq->__lock){-.-.}-{2:2}: lock_acquire.part.0+0x1d0/0x424 kernel/locking/lockdep.c:5639 lock_acquire+0x54/0x6a kernel/locking/lockdep.c:5612 _raw_spin_lock_nested+0x36/0x4e kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested+0x22/0x34 kernel/sched/core.c:489 raw_spin_rq_lock kernel/sched/sched.h:1318 [inline] rq_lock kernel/sched/sched.h:1616 [inline] task_fork_fair+0xa8/0x218 kernel/sched/fair.c:11146 sched_post_fork+0x16e/0x196 kernel/sched/core.c:4462 copy_process+0x3378/0x3c34 kernel/fork.c:2379 kernel_clone+0xee/0x920 kernel/fork.c:2555 kernel_thread+0xf8/0x130 kernel/fork.c:2607 rest_init+0x34/0x3f2 init/main.c:690 arch_call_rest_init+0x18/0x20 init/main.c:881 start_kernel+0x66a/0x698 init/main.c:1138 -> #3 (&p->pi_lock){-.-.}-{2:2}: lock_acquire.part.0+0x1d0/0x424 kernel/locking/lockdep.c:5639 lock_acquire+0x54/0x6a kernel/locking/lockdep.c:5612 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3e/0x62 kernel/locking/spinlock.c:162 try_to_wake_up+0xa4/0x748 kernel/sched/core.c:4017 default_wake_function+0x28/0x36 kernel/sched/core.c:6723 woken_wake_function+0x38/0x48 kernel/sched/wait.c:481 __wake_up_common+0xb6/0x236 kernel/sched/wait.c:108 __wake_up_common_lock+0xd6/0x136 kernel/sched/wait.c:138 __wake_up+0x10/0x18 kernel/sched/wait.c:157 tty_wakeup+0x58/0xbe drivers/tty/tty_io.c:534 tty_port_default_wakeup+0x2c/0x44 drivers/tty/tty_port.c:51 tty_port_tty_wakeup+0x3a/0x46 drivers/tty/tty_port.c:413 uart_write_wakeup+0x34/0x48 drivers/tty/serial/serial_core.c:106 serial8250_tx_chars+0x322/0x592 drivers/tty/serial/8250/8250_port.c:1845 serial8250_handle_irq.part.0+0x284/0x286 drivers/tty/serial/8250/8250_port.c:1932 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1905 [inline] serial8250_default_handle_irq+0xac/0x142 drivers/tty/serial/8250/8250_port.c:1949 serial8250_interrupt+0xbe/0x1a6 drivers/tty/serial/8250/8250_core.c:126 __handle_irq_event_percpu+0x16e/0x6ec kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0x6a/0xfa kernel/irq/handle.c:210 handle_fasteoi_irq+0x1c0/0x4d6 kernel/irq/chip.c:715 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline] handle_irq_desc kernel/irq/irqdesc.c:646 [inline] generic_handle_domain_irq+0x7c/0x9c kernel/irq/irqdesc.c:680 plic_handle_irq+0x122/0x242 drivers/irqchip/irq-sifive-plic.c:242 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline] handle_irq_desc kernel/irq/irqdesc.c:646 [inline] generic_handle_domain_irq+0x7c/0x9c kernel/irq/irqdesc.c:680 riscv_intc_irq+0x7e/0xc8 drivers/irqchip/irq-riscv-intc.c:40 generic_handle_arch_irq+0x36/0x54 kernel/irq/handle.c:238 ret_from_exception+0x0/0x10 rcu_gp_cleanup+0x182/0xa90 kernel/rcu/tree.c:2036 -> #2 (&tty->write_wait){-.-.}-{2:2}: lock_acquire.part.0+0x1d0/0x424 kernel/locking/lockdep.c:5639 lock_acquire+0x54/0x6a kernel/locking/lockdep.c:5612 __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+0xc4/0x136 kernel/sched/wait.c:137 __wake_up+0x10/0x18 kernel/sched/wait.c:157 tty_wakeup+0x58/0xbe drivers/tty/tty_io.c:534 tty_port_default_wakeup+0x2c/0x44 drivers/tty/tty_port.c:51 tty_port_tty_wakeup+0x3a/0x46 drivers/tty/tty_port.c:413 uart_write_wakeup+0x34/0x48 drivers/tty/serial/serial_core.c:106 serial8250_tx_chars+0x322/0x592 drivers/tty/serial/8250/8250_port.c:1845 serial8250_handle_irq.part.0+0x284/0x286 drivers/tty/serial/8250/8250_port.c:1932 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1905 [inline] serial8250_default_handle_irq+0xac/0x142 drivers/tty/serial/8250/8250_port.c:1949 serial8250_interrupt+0xbe/0x1a6 drivers/tty/serial/8250/8250_core.c:126 __handle_irq_event_percpu+0x16e/0x6ec kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0x6a/0xfa kernel/irq/handle.c:210 handle_fasteoi_irq+0x1c0/0x4d6 kernel/irq/chip.c:715 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline] handle_irq_desc kernel/irq/irqdesc.c:646 [inline] generic_handle_domain_irq+0x7c/0x9c kernel/irq/irqdesc.c:680 plic_handle_irq+0x122/0x242 drivers/irqchip/irq-sifive-plic.c:242 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline] handle_irq_desc kernel/irq/irqdesc.c:646 [inline] generic_handle_domain_irq+0x7c/0x9c kernel/irq/irqdesc.c:680 riscv_intc_irq+0x7e/0xc8 drivers/irqchip/irq-riscv-intc.c:40 generic_handle_arch_irq+0x36/0x54 kernel/irq/handle.c:238 ret_from_exception+0x0/0x10 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock_irqrestore+0x68/0x98 kernel/locking/spinlock.c:194 -> #1 (&port_lock_key){-.-.}-{2:2}: lock_acquire.part.0+0x1d0/0x424 kernel/locking/lockdep.c:5639 lock_acquire+0x54/0x6a kernel/locking/lockdep.c:5612 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3e/0x62 kernel/locking/spinlock.c:162 serial8250_console_write+0x848/0x8e6 drivers/tty/serial/8250/8250_port.c:3387 univ8250_console_write+0x46/0x54 drivers/tty/serial/8250/8250_core.c:575 call_console_drivers kernel/printk/printk.c:1929 [inline] console_unlock+0x666/0x97a kernel/printk/printk.c:2711 register_console+0x250/0x534 kernel/printk/printk.c:3054 uart_configure_port drivers/tty/serial/serial_core.c:2402 [inline] uart_add_one_port+0xbf2/0xc14 drivers/tty/serial/serial_core.c:2917 serial8250_register_8250_port+0x8ce/0xc6e drivers/tty/serial/8250/8250_core.c:1082 of_platform_serial_probe+0x7ae/0xa9c drivers/tty/serial/8250/8250_of.c:232 platform_probe+0xc8/0x172 drivers/base/platform.c:1416 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1a6/0x89e drivers/base/dd.c:596 __driver_probe_device+0x24a/0x2d4 drivers/base/dd.c:752 driver_probe_device+0x60/0x1a4 drivers/base/dd.c:782 __driver_attach+0x178/0x33e drivers/base/dd.c:1141 bus_for_each_dev+0x122/0x194 drivers/base/bus.c:301 driver_attach+0x32/0x3c drivers/base/dd.c:1158 bus_add_driver+0x2c6/0x41a drivers/base/bus.c:618 driver_register+0x144/0x286 drivers/base/driver.c:171 __platform_driver_register+0x46/0x52 drivers/base/platform.c:863 of_platform_serial_driver_init+0x22/0x2a drivers/tty/serial/8250/8250_of.c:341 do_one_initcall+0x13a/0x7ea init/main.c:1300 do_initcall_level init/main.c:1373 [inline] do_initcalls init/main.c:1389 [inline] do_basic_setup init/main.c:1408 [inline] kernel_init_freeable+0x510/0x5b4 init/main.c:1613 kernel_init+0x28/0x21c init/main.c:1502 ret_from_exception+0x0/0x10 -> #0 (console_owner){-...}-{0:0}: check_noncircular+0x1de/0x1fe kernel/locking/lockdep.c:2143 check_prev_add kernel/locking/lockdep.c:3063 [inline] check_prevs_add kernel/locking/lockdep.c:3186 [inline] validate_chain kernel/locking/lockdep.c:3801 [inline] __lock_acquire+0x19a4/0x333e kernel/locking/lockdep.c:5027 lock_acquire.part.0+0x1d0/0x424 kernel/locking/lockdep.c:5639 lock_acquire+0x54/0x6a kernel/locking/lockdep.c:5612 console_lock_spinning_enable kernel/printk/printk.c:1781 [inline] console_unlock+0x304/0x97a kernel/printk/printk.c:2708 vprintk_emit+0xd2/0x416 kernel/printk/printk.c:2245 vprintk_default+0x22/0x2e kernel/printk/printk.c:2256 vprintk+0x108/0x13e kernel/printk/printk_safe.c:50 _printk+0xa0/0xc8 kernel/printk/printk.c:2266 die_kernel_fault+0x3a/0x60 arch/riscv/mm/fault.c:29 no_context arch/riscv/mm/fault.c:58 [inline] no_context arch/riscv/mm/fault.c:37 [inline] mm_fault_error arch/riscv/mm/fault.c:77 [inline] do_page_fault+0x5b2/0xa3c arch/riscv/mm/fault.c:348 ret_from_exception+0x0/0x10 __hrtimer_get_next_event kernel/time/hrtimer.c:577 [inline] hrtimer_update_next_event+0x9e/0x12c kernel/time/hrtimer.c:604 other info that might help us debug this: Chain exists of: console_owner --> &rt_b->rt_runtime_lock --> hrtimer_bases.lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(hrtimer_bases.lock); lock(&rt_b->rt_runtime_lock); lock(hrtimer_bases.lock); lock(console_owner); *** DEADLOCK *** 2 locks held by sshd/2022: #0: ffffaf805a9e7418 (hrtimer_bases.lock){-.-.}-{2:2}, at: __run_hrtimer kernel/time/hrtimer.c:1689 [inline] #0: ffffaf805a9e7418 (hrtimer_bases.lock){-.-.}-{2:2}, at: __hrtimer_run_queues+0x262/0xa16 kernel/time/hrtimer.c:1749 #1: ffffffff84a88600 (console_lock){+.+.}-{0:0}, at: vprintk_default+0x22/0x2e kernel/printk/printk.c:2256 stack backtrace: CPU: 1 PID: 2022 Comm: sshd Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:113 [] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:119 [] __dump_stack lib/dump_stack.c:88 [inline] [] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:106 [] dump_stack+0x1c/0x24 lib/dump_stack.c:113 [] print_circular_bug+0x34e/0x3d8 kernel/locking/lockdep.c:2021 [] check_noncircular+0x1de/0x1fe kernel/locking/lockdep.c:2143 [] check_prev_add kernel/locking/lockdep.c:3063 [inline] [] check_prevs_add kernel/locking/lockdep.c:3186 [inline] [] validate_chain kernel/locking/lockdep.c:3801 [inline] [] __lock_acquire+0x19a4/0x333e kernel/locking/lockdep.c:5027 [] lock_acquire.part.0+0x1d0/0x424 kernel/locking/lockdep.c:5639 [] lock_acquire+0x54/0x6a kernel/locking/lockdep.c:5612 [] console_lock_spinning_enable kernel/printk/printk.c:1781 [inline] [] console_unlock+0x304/0x97a kernel/printk/printk.c:2708 [] vprintk_emit+0xd2/0x416 kernel/printk/printk.c:2245 [] vprintk_default+0x22/0x2e kernel/printk/printk.c:2256 [] vprintk+0x108/0x13e kernel/printk/printk_safe.c:50 [] _printk+0xa0/0xc8 kernel/printk/printk.c:2266 [] die_kernel_fault+0x3a/0x60 arch/riscv/mm/fault.c:29 [] no_context arch/riscv/mm/fault.c:58 [inline] [] no_context arch/riscv/mm/fault.c:37 [inline] [] mm_fault_error arch/riscv/mm/fault.c:77 [inline] [] do_page_fault+0x5b2/0xa3c arch/riscv/mm/fault.c:348 [] ret_from_exception+0x0/0x10 [] __hrtimer_get_next_event kernel/time/hrtimer.c:577 [inline] [] hrtimer_update_next_event+0x9e/0x12c kernel/time/hrtimer.c:604 Oops [#1] Modules linked in: CPU: 1 PID: 2022 Comm: sshd Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) epc : __hrtimer_get_next_event kernel/time/hrtimer.c:577 [inline] epc : hrtimer_update_next_event+0xaa/0x12c kernel/time/hrtimer.c:604 ra : __hrtimer_get_next_event kernel/time/hrtimer.c:577 [inline] ra : hrtimer_update_next_event+0x9e/0x12c kernel/time/hrtimer.c:604 epc : ffffffff8016c642 ra : ffffffff8016c636 sp : ffffaf800cb936b0 gp : ffffffff85863ac0 tp : ffffaf800cf5c8c0 t0 : 0000000000046000 t1 : 3bc8d578b96e3e00 t2 : ffffffff83604ca0 s0 : ffffaf800cb936f0 s1 : ffffffff801110e4 a0 : 0000000000000000 a1 : 0000000000000000 a2 : 0000000000000050 a3 : 7fffffffffffffff a4 : 0000000000000000 a5 : ffffffff8011115c a6 : 0000000000f00000 a7 : ffffffff80b09d26 s2 : 0000000000000000 s3 : ffffffff80111128 s4 : 000000007bb67b56 s5 : ffffffff8011115c s6 : ffffffffffffffff s7 : ffffffff801110e4 s8 : ffffaf800cb93860 s9 : ffffaf805a9e7460 s10: ffffaf805a9e7768 s11: ffffaf805a9e7448 t3 : fffffffff3f3f300 t4 : ffffffff80112282 t5 : 1ffff5f001972638 t6 : 0000000000040000 status: 0000000000000100 badaddr: ffffffff8011115c cause: 000000000000000f [] hrtimer_interrupt+0x1da/0x3ea kernel/time/hrtimer.c:1814 [] riscv_timer_interrupt+0x5c/0x6a drivers/clocksource/timer-riscv.c:97