Unable to handle kernel paging request at virtual address 36e3ffff9123a400 ====================================================== WARNING: possible circular locking dependency detected 6.16.0-rc7-syzkaller-g7b388bf7a9d9 #0 Not tainted ------------------------------------------------------ syz.1.376/6246 is trying to acquire lock: ffffffff884e8200 (console_owner){..-.}-{0:0}, at: console_lock_spinning_enable+0x9a/0xd6 kernel/printk/printk.c:1920 but task is already holding lock: ffffaf806ecfb098 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:606 [inline] ffffaf806ecfb098 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1532 [inline] ffffaf806ecfb098 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1856 [inline] ffffaf806ecfb098 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x314/0x4088 kernel/sched/core.c:6710 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+0x86/0x1f4 kernel/sched/psi.c:1161 css_set_move_task+0x1da/0x446 kernel/cgroup/cgroup.c:918 cgroup_post_fork+0x16c/0x816 kernel/cgroup/cgroup.c:6754 copy_process+0x51ae/0x62e4 kernel/fork.c:2413 kernel_clone+0x128/0xe1e kernel/fork.c:2599 user_mode_thread+0xd4/0x110 kernel/fork.c:2677 rest_init+0x34/0x2e6 init/main.c:710 console_on_rootfs+0x0/0x96 init/main.c:1102 -> #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+0xb8/0xfcc kernel/sched/core.c:4227 default_wake_function+0x30/0x58 kernel/sched/core.c:7121 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+0x648/0x938 drivers/tty/serial/8250/8250_port.c:1946 serial8250_default_handle_irq+0x80/0xe4 drivers/tty/serial/8250/8250_port.c:1966 serial8250_interrupt+0xda/0x1ee drivers/tty/serial/8250/8250_core.c:86 __handle_irq_event_percpu+0x268/0xb38 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0xb4/0x1ee kernel/irq/handle.c:210 handle_fasteoi_irq+0x32c/0xd5a kernel/irq/chip.c:706 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:442 call_on_irq_stack+0x32/0x40 arch/riscv/kernel/entry.S:395 -> #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+0x648/0x938 drivers/tty/serial/8250/8250_port.c:1946 serial8250_default_handle_irq+0x80/0xe4 drivers/tty/serial/8250/8250_port.c:1966 serial8250_interrupt+0xda/0x1ee drivers/tty/serial/8250/8250_core.c:86 __handle_irq_event_percpu+0x268/0xb38 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0xb4/0x1ee kernel/irq/handle.c:210 handle_fasteoi_irq+0x32c/0xd5a kernel/irq/chip.c:706 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:442 call_on_irq_stack+0x32/0x40 arch/riscv/kernel/entry.S:395 -> #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+0x2a/0x2b6 include/linux/serial_core.h:717 serial8250_console_write+0x1ae/0x15d4 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+0x7bc/0xb70 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+0x476/0x784 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+0x9a2/0xf30 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+0x1f6e/0x2058 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/0x2072 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+0x236/0x9c2 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+0x1b0/0xb76 init/main.c:1274 do_initcall_level init/main.c:1336 [inline] do_initcalls init/main.c:1352 [inline] do_basic_setup init/main.c:1371 [inline] kernel_init_freeable+0x6e4/0x790 init/main.c:1584 kernel_init+0x28/0x24c init/main.c:1474 ret_from_fork_kernel+0x2a/0xbec arch/riscv/kernel/process.c:228 ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:362 -> #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+0x12a0/0x24d8 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+0x772/0xb70 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+0x476/0x784 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 die_kernel_fault+0x3e/0x7f0 arch/riscv/mm/fault.c:81 no_context arch/riscv/mm/fault.c:111 [inline] no_context arch/riscv/mm/fault.c:90 [inline] mm_fault_error arch/riscv/mm/fault.c:117 [inline] handle_page_fault+0x9dc/0x1388 arch/riscv/mm/fault.c:431 do_page_fault+0x20/0x56 arch/riscv/kernel/traps.c:428 handle_exception+0x15e/0x16a arch/riscv/kernel/entry.S:231 bpf_prog_d975ecbd55eac00b+0x5e/0x78 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.1.376/6246: #0: ffffaf806ecfb098 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:606 [inline] #0: ffffaf806ecfb098 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1532 [inline] #0: ffffaf806ecfb098 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1856 [inline] #0: ffffaf806ecfb098 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x314/0x4088 kernel/sched/core.c:6710 #1: ffffffff885dbd80 (rcu_read_lock){....}-{1:3}, at: bpf_set_run_ctx include/linux/bpf.h:2193 [inline] #1: ffffffff885dbd80 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2255 [inline] #1: ffffffff885dbd80 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run4+0x20a/0x70c kernel/trace/bpf_trace.c:2301 #2: ffffffff884e7e00 (console_lock){+.+.}-{0:0}, at: vprintk_default+0x26/0x32 kernel/printk/printk.c:2465 #3: ffffffff884e8050 (console_srcu){....}-{0:0}, at: console_flush_all+0x114/0xb70 kernel/printk/printk.c:3234 stack backtrace: CPU: 0 UID: 0 PID: 6246 Comm: syz.1.376 Not tainted 6.16.0-rc7-syzkaller-g7b388bf7a9d9 #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+0x12a0/0x24d8 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+0x772/0xb70 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+0x476/0x784 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 [] die_kernel_fault+0x3e/0x7f0 arch/riscv/mm/fault.c:81 [] no_context arch/riscv/mm/fault.c:111 [inline] [] no_context arch/riscv/mm/fault.c:90 [inline] [] mm_fault_error arch/riscv/mm/fault.c:117 [inline] [] handle_page_fault+0x9dc/0x1388 arch/riscv/mm/fault.c:431 [] do_page_fault+0x20/0x56 arch/riscv/kernel/traps.c:428 [] handle_exception+0x15e/0x16a arch/riscv/kernel/entry.S:231 [] bpf_prog_d975ecbd55eac00b+0x5e/0x78 Current syz.1.376 pgtable: 4K pagesize, 48-bit VAs, pgdp=0x00000000b18d1000 [36e3ffff9123a400] pgd=000000003cbfe801 , p4d=000000003cbfe801 , pud=000000003cbfe401 , pmd=00000000245000e7 Oops [#1] Modules linked in: CPU: 0 UID: 0 PID: 6246 Comm: syz.1.376 Not tainted 6.16.0-rc7-syzkaller-g7b388bf7a9d9 #0 PREEMPT Hardware name: riscv-virtio,qemu (DT) epc : bpf_prog_d975ecbd55eac00b+0x5e/0x78 ra : bpf_dispatcher_nop_func include/linux/bpf.h:1322 [inline] ra : __bpf_prog_run include/linux/filter.h:718 [inline] ra : bpf_prog_run include/linux/filter.h:725 [inline] ra : __bpf_trace_run kernel/trace/bpf_trace.c:2258 [inline] ra : bpf_trace_run4+0x2a6/0x70c kernel/trace/bpf_trace.c:2301 epc : ffffffff78000336 ra : ffffffff80595fb0 sp : ffff8f8006dc7590 gp : ffffffff89e816e0 tp : ffffaf801b358000 t0 : 0000025fae576bdc t1 : 36e3ffff9123a400 t2 : ffffffff9123a400 s0 : ffff8f8006dc75c0 s1 : ffff8f8006dc7680 a0 : ffffaf801b4de1d8 a1 : ffff8f8006dc759c a2 : 0000000000000008 a3 : 0000000000000000 a4 : 1ffff1f0001d1606 a5 : ffffffff17a27000 a6 : 0000000000000021 a7 : ffffffff80595f14 s2 : 1ffff1f000db8ebc s3 : 0000000000000400 s4 : ffffffff9123a400 s5 : ffff8f8006dc75a0 s6 : 0000000000000001 s7 : 1ffff1f0001d1605 s8 : ffff8f8000e8b028 s9 : ffff8f8006dc7600 s10: 0000000000000001 s11: 0000000000000000 t3 : 012e2d8700000000 t4 : 0000000000001fff t5 : 00000000000000c8 t6 : 0000000000000002 ssp : 0000000000000000 status: 0000000200000100 badaddr: 36e3ffff9123a400 cause: 000000000000000d [] bpf_prog_d975ecbd55eac00b+0x5e/0x78 [] 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+0x2a6/0x70c 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+0x1372/0x4088 kernel/sched/core.c:6783 [] __schedule_loop kernel/sched/core.c:6864 [inline] [] schedule+0xc4/0x35e kernel/sched/core.c:6879 [] futex_do_wait+0x74/0x15c kernel/futex/waitwake.c:358 [] __futex_wait+0x18a/0x26e kernel/futex/waitwake.c:687 [] futex_wait+0xfe/0x2d6 kernel/futex/waitwake.c:715 [] do_futex+0x194/0x274 kernel/futex/syscalls.c:102 [] __do_sys_futex kernel/futex/syscalls.c:179 [inline] [] __se_sys_futex kernel/futex/syscalls.c:160 [inline] [] __riscv_sys_futex+0x19c/0x3dc kernel/futex/syscalls.c:160 [] syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:112 [] do_trap_ecall_u+0x396/0x530 arch/riscv/kernel/traps.c:343 [] handle_exception+0x15e/0x16a arch/riscv/kernel/entry.S:231 Code: 97aa 639c 3303 00c2 a397 1923 8393 0d63 6333 2073 (3303) 0003 ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 97aa add a5,a5,a0 2: 639c flw fa5,0(a5) 4: 00c23303 .4byte 0xc23303 8: 1923a397 auipc t2,0x1923a c: 0d638393 add t2,t2,214 # 0x1923a0de 10: 20736333 .4byte 0x20736333 * 14: 00033303 .4byte 0x33303 <-- trapping instruction