------------[ cut here ]------------ ====================================================== WARNING: possible circular locking dependency detected 5.15.176-syzkaller #0 Not tainted ------------------------------------------------------ swapper/0/0 is trying to acquire lock: ffffffff8cb14860 (console_owner){-.-.}-{0:0}, at: console_lock_spinning_enable+0x2c/0x60 kernel/printk/printk.c:1802 but task is already holding lock: ffff8880b8e39b18 (&pool->lock){-.-.}-{2:2}, at: __queue_work+0x56d/0xd00 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&pool->lock){-.-.}-{2:2}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 __queue_work+0x56d/0xd00 queue_work_on+0x14b/0x250 kernel/workqueue.c:1559 queue_work include/linux/workqueue.h:512 [inline] schedule_work include/linux/workqueue.h:573 [inline] p9_pollwake+0x142/0x160 net/9p/trans_fd.c:542 __wake_up_common+0x2a0/0x4e0 kernel/sched/wait.c:108 __wake_up_common_lock kernel/sched/wait.c:138 [inline] __wake_up+0x112/0x1c0 kernel/sched/wait.c:157 tty_write_unlock drivers/tty/tty_io.c:956 [inline] do_tty_write drivers/tty/tty_io.c:1063 [inline] file_tty_write+0x80f/0x920 drivers/tty/tty_io.c:1110 call_write_iter include/linux/fs.h:2174 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0xacd/0xe50 fs/read_write.c:594 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #2 (&tty->write_wait){-...}-{2:2}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 __wake_up_common_lock kernel/sched/wait.c:137 [inline] __wake_up+0xf5/0x1c0 kernel/sched/wait.c:157 tty_port_default_wakeup+0xa8/0x100 drivers/tty/tty_port.c:51 serial8250_tx_chars+0x60d/0x800 drivers/tty/serial/8250/8250_port.c:1828 serial8250_handle_irq+0x505/0x600 drivers/tty/serial/8250/8250_port.c:1924 serial8250_default_handle_irq+0xc8/0x1e0 drivers/tty/serial/8250/8250_port.c:1941 serial8250_interrupt+0xa1/0x1e0 drivers/tty/serial/8250/8250_core.c:127 __handle_irq_event_percpu+0x292/0xa70 kernel/irq/handle.c:156 handle_irq_event_percpu kernel/irq/handle.c:196 [inline] handle_irq_event+0xff/0x2b0 kernel/irq/handle.c:213 handle_edge_irq+0x245/0xbf0 kernel/irq/chip.c:819 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline] handle_irq arch/x86/kernel/irq.c:231 [inline] __common_interrupt+0xd7/0x1f0 arch/x86/kernel/irq.c:250 common_interrupt+0xae/0xd0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:667 native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] acpi_safe_halt drivers/acpi/processor_idle.c:108 [inline] acpi_idle_do_entry+0x10f/0x340 drivers/acpi/processor_idle.c:562 acpi_idle_enter+0x352/0x4f0 drivers/acpi/processor_idle.c:697 cpuidle_enter_state+0x521/0xef0 drivers/cpuidle/cpuidle.c:237 cpuidle_enter+0x59/0x90 drivers/cpuidle/cpuidle.c:351 call_cpuidle kernel/sched/idle.c:158 [inline] cpuidle_idle_call kernel/sched/idle.c:239 [inline] do_idle+0x3e4/0x670 kernel/sched/idle.c:306 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403 start_kernel+0x48c/0x540 init/main.c:1140 secondary_startup_64_no_verify+0xb1/0xbb -> #1 (&port_lock_key){-.-.}-{2:2}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 serial8250_console_write+0x19d/0x1180 drivers/tty/serial/8250/8250_port.c:3354 console_unlock+0xced/0x12b0 kernel/printk/printk.c:2744 vprintk_emit+0xbf/0x150 kernel/printk/printk.c:2274 _printk+0xd1/0x120 kernel/printk/printk.c:2299 register_console+0x65a/0x940 kernel/printk/printk.c:3107 univ8250_console_init+0x41/0x50 drivers/tty/serial/8250/8250_core.c:690 console_init+0x18c/0x660 kernel/printk/printk.c:3207 start_kernel+0x301/0x540 init/main.c:1076 secondary_startup_64_no_verify+0xb1/0xbb -> #0 (console_owner){-.-.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 console_lock_spinning_enable+0x51/0x60 kernel/printk/printk.c:1805 console_unlock+0xa47/0x12b0 kernel/printk/printk.c:2741 vprintk_emit+0xbf/0x150 kernel/printk/printk.c:2274 _printk+0xd1/0x120 kernel/printk/printk.c:2299 report_bug+0x1e5/0x2e0 lib/bug.c:195 handle_bug+0x3d/0x70 arch/x86/kernel/traps.c:239 exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:259 asm_exc_invalid_op+0x16/0x20 arch/x86/include/asm/idtentry.h:604 copy_from_user_nofault+0x15c/0x1c0 bpf_probe_read_user_common kernel/trace/bpf_trace.c:157 [inline] ____bpf_probe_read_user kernel/trace/bpf_trace.c:166 [inline] bpf_probe_read_user+0x26/0x70 kernel/trace/bpf_trace.c:163 bpf_prog_a7c3bb8cfcee081b+0x45/0xa3c bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:1878 [inline] bpf_trace_run1+0x168/0x2f0 kernel/trace/bpf_trace.c:1914 __traceiter_workqueue_activate_work+0x64/0xb0 include/trace/events/workqueue.h:59 trace_workqueue_activate_work+0x150/0x1b0 include/trace/events/workqueue.h:59 __queue_work+0x89e/0xd00 kernel/workqueue.c:1521 call_timer_fn+0x16d/0x560 kernel/time/timer.c:1451 expire_timers kernel/time/timer.c:1491 [inline] __run_timers+0x6a8/0x890 kernel/time/timer.c:1767 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780 handle_softirqs+0x3a7/0x930 kernel/softirq.c:558 __do_softirq kernel/softirq.c:592 [inline] invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x157/0x240 kernel/softirq.c:641 irq_exit_rcu+0x5/0x20 kernel/softirq.c:653 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 sched_core_balance+0x125/0xc90 kernel/sched/core.c:6054 do_balance_callbacks kernel/sched/core.c:4670 [inline] __balance_callbacks+0x180/0x270 kernel/sched/core.c:4724 finish_lock_switch+0x80/0x100 kernel/sched/core.c:4780 finish_task_switch+0x134/0x630 kernel/sched/core.c:4899 context_switch kernel/sched/core.c:5030 [inline] __schedule+0x12cc/0x45b0 kernel/sched/core.c:6373 schedule_idle+0x4a/0x90 kernel/sched/core.c:6484 do_idle+0x61e/0x670 kernel/sched/idle.c:334 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403 start_kernel+0x48c/0x540 init/main.c:1140 secondary_startup_64_no_verify+0xb1/0xbb other info that might help us debug this: Chain exists of: console_owner --> &tty->write_wait --> &pool->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&pool->lock); lock(&tty->write_wait); lock(&pool->lock); lock(console_owner); *** DEADLOCK *** 6 locks held by swapper/0/0: #0: ffffffff8cb1fce0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 #1: ffffc90000007be0 (&(&nsim_dev->trap_data->trap_report_dw)->timer){..-.}-{0:0}, at: lockdep_copy_map include/linux/lockdep.h:45 [inline] #1: ffffc90000007be0 (&(&nsim_dev->trap_data->trap_report_dw)->timer){..-.}-{0:0}, at: call_timer_fn+0xbe/0x560 kernel/time/timer.c:1441 #2: ffffffff8cb1fce0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311 #3: ffff8880b8e39b18 (&pool->lock){-.-.}-{2:2}, at: __queue_work+0x56d/0xd00 #4: ffffffff8cb1fce0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311 #5: ffffffff8c9fc5a0 (console_lock){+.+.}-{0:0}, at: vprintk_emit+0xa6/0x150 kernel/printk/printk.c:2273 stack backtrace: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.15.176-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 console_lock_spinning_enable+0x51/0x60 kernel/printk/printk.c:1805 console_unlock+0xa47/0x12b0 kernel/printk/printk.c:2741 vprintk_emit+0xbf/0x150 kernel/printk/printk.c:2274 _printk+0xd1/0x120 kernel/printk/printk.c:2299 report_bug+0x1e5/0x2e0 lib/bug.c:195 handle_bug+0x3d/0x70 arch/x86/kernel/traps.c:239 exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:259 asm_exc_invalid_op+0x16/0x20 arch/x86/include/asm/idtentry.h:604 RIP: 0010:copy_from_user_nofault+0x15c/0x1c0 mm/maccess.c:226 Code: db 48 c7 c0 f2 ff ff ff 48 0f 44 c5 eb 0c e8 cb ba d5 ff 48 c7 c0 f2 ff ff ff 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 b4 ba d5 ff <0f> 0b e9 1e ff ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c ef fe ff RSP: 0018:ffffc90000007988 EFLAGS: 00010046 RAX: ffffffff81aaca2c RBX: 0000000000000000 RCX: ffffffff8c8bd680 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: dffffc0000000000 R08: ffffffff81aac93d R09: fffffbfff2131421 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000020000000 R13: 0000000000000008 R14: 0000000020000000 R15: ffffc900000079e8 bpf_probe_read_user_common kernel/trace/bpf_trace.c:157 [inline] ____bpf_probe_read_user kernel/trace/bpf_trace.c:166 [inline] bpf_probe_read_user+0x26/0x70 kernel/trace/bpf_trace.c:163 bpf_prog_a7c3bb8cfcee081b+0x45/0xa3c bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:1878 [inline] bpf_trace_run1+0x168/0x2f0 kernel/trace/bpf_trace.c:1914 __traceiter_workqueue_activate_work+0x64/0xb0 include/trace/events/workqueue.h:59 trace_workqueue_activate_work+0x150/0x1b0 include/trace/events/workqueue.h:59 __queue_work+0x89e/0xd00 kernel/workqueue.c:1521 call_timer_fn+0x16d/0x560 kernel/time/timer.c:1451 expire_timers kernel/time/timer.c:1491 [inline] __run_timers+0x6a8/0x890 kernel/time/timer.c:1767 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780 handle_softirqs+0x3a7/0x930 kernel/softirq.c:558 __do_softirq kernel/softirq.c:592 [inline] invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x157/0x240 kernel/softirq.c:641 irq_exit_rcu+0x5/0x20 kernel/softirq.c:653 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:sched_core_balance+0x125/0xc90 kernel/sched/core.c:6054 Code: 00 48 c7 c2 20 cf aa 8a e8 38 b1 0a 00 48 89 5c 24 48 e9 ed 0a 00 00 48 8b 7c 24 40 e8 24 41 f0 08 e8 af 87 2e 00 fb 83 fb 08 <0f> 83 c0 0a 00 00 48 8b 44 24 58 4c 8d 3c c5 10 b8 5c 8c 4c 89 f8 RSP: 0018:ffffffff8c807980 EFLAGS: 00000293 RAX: 322c20dcb0b3c800 RBX: 0000000000000000 RCX: ffffffff96a90f03 RDX: dffffc0000000000 RSI: ffffffff8aab2b80 RDI: ffffffff8af9f340 RBP: ffffffff8c807ae8 R08: ffffffff81870370 R09: ffffed10171c7461 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880b8e27700 R13: dffffc0000000000 R14: ffff8880b8e3a300 R15: ffffffff81587a70 do_balance_callbacks kernel/sched/core.c:4670 [inline] __balance_callbacks+0x180/0x270 kernel/sched/core.c:4724 finish_lock_switch+0x80/0x100 kernel/sched/core.c:4780 finish_task_switch+0x134/0x630 kernel/sched/core.c:4899 context_switch kernel/sched/core.c:5030 [inline] __schedule+0x12cc/0x45b0 kernel/sched/core.c:6373 schedule_idle+0x4a/0x90 kernel/sched/core.c:6484 do_idle+0x61e/0x670 kernel/sched/idle.c:334 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403 start_kernel+0x48c/0x540 init/main.c:1140 secondary_startup_64_no_verify+0xb1/0xbb WARNING: CPU: 0 PID: 0 at mm/maccess.c:226 copy_from_user_nofault+0x15c/0x1c0 Modules linked in: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.15.176-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:copy_from_user_nofault+0x15c/0x1c0 mm/maccess.c:226 Code: db 48 c7 c0 f2 ff ff ff 48 0f 44 c5 eb 0c e8 cb ba d5 ff 48 c7 c0 f2 ff ff ff 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 b4 ba d5 ff <0f> 0b e9 1e ff ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c ef fe ff RSP: 0018:ffffc90000007988 EFLAGS: 00010046 RAX: ffffffff81aaca2c RBX: 0000000000000000 RCX: ffffffff8c8bd680 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: dffffc0000000000 R08: ffffffff81aac93d R09: fffffbfff2131421 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000020000000 R13: 0000000000000008 R14: 0000000020000000 R15: ffffc900000079e8 FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000205ee000 CR3: 000000005e314000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: bpf_probe_read_user_common kernel/trace/bpf_trace.c:157 [inline] ____bpf_probe_read_user kernel/trace/bpf_trace.c:166 [inline] bpf_probe_read_user+0x26/0x70 kernel/trace/bpf_trace.c:163 bpf_prog_a7c3bb8cfcee081b+0x45/0xa3c bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:1878 [inline] bpf_trace_run1+0x168/0x2f0 kernel/trace/bpf_trace.c:1914 __traceiter_workqueue_activate_work+0x64/0xb0 include/trace/events/workqueue.h:59 trace_workqueue_activate_work+0x150/0x1b0 include/trace/events/workqueue.h:59 __queue_work+0x89e/0xd00 kernel/workqueue.c:1521 call_timer_fn+0x16d/0x560 kernel/time/timer.c:1451 expire_timers kernel/time/timer.c:1491 [inline] __run_timers+0x6a8/0x890 kernel/time/timer.c:1767 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780 handle_softirqs+0x3a7/0x930 kernel/softirq.c:558 __do_softirq kernel/softirq.c:592 [inline] invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x157/0x240 kernel/softirq.c:641 irq_exit_rcu+0x5/0x20 kernel/softirq.c:653 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:sched_core_balance+0x125/0xc90 kernel/sched/core.c:6054 Code: 00 48 c7 c2 20 cf aa 8a e8 38 b1 0a 00 48 89 5c 24 48 e9 ed 0a 00 00 48 8b 7c 24 40 e8 24 41 f0 08 e8 af 87 2e 00 fb 83 fb 08 <0f> 83 c0 0a 00 00 48 8b 44 24 58 4c 8d 3c c5 10 b8 5c 8c 4c 89 f8 RSP: 0018:ffffffff8c807980 EFLAGS: 00000293 RAX: 322c20dcb0b3c800 RBX: 0000000000000000 RCX: ffffffff96a90f03 RDX: dffffc0000000000 RSI: ffffffff8aab2b80 RDI: ffffffff8af9f340 RBP: ffffffff8c807ae8 R08: ffffffff81870370 R09: ffffed10171c7461 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880b8e27700 R13: dffffc0000000000 R14: ffff8880b8e3a300 R15: ffffffff81587a70 do_balance_callbacks kernel/sched/core.c:4670 [inline] __balance_callbacks+0x180/0x270 kernel/sched/core.c:4724 finish_lock_switch+0x80/0x100 kernel/sched/core.c:4780 finish_task_switch+0x134/0x630 kernel/sched/core.c:4899 context_switch kernel/sched/core.c:5030 [inline] __schedule+0x12cc/0x45b0 kernel/sched/core.c:6373 schedule_idle+0x4a/0x90 kernel/sched/core.c:6484 do_idle+0x61e/0x670 kernel/sched/idle.c:334 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403 start_kernel+0x48c/0x540 init/main.c:1140 secondary_startup_64_no_verify+0xb1/0xbb ---------------- Code disassembly (best guess): 0: 00 48 c7 add %cl,-0x39(%rax) 3: c2 20 cf ret $0xcf20 6: aa stos %al,%es:(%rdi) 7: 8a e8 mov %al,%ch 9: 38 b1 0a 00 48 89 cmp %dh,-0x76b7fff6(%rcx) f: 5c pop %rsp 10: 24 48 and $0x48,%al 12: e9 ed 0a 00 00 jmp 0xb04 17: 48 8b 7c 24 40 mov 0x40(%rsp),%rdi 1c: e8 24 41 f0 08 call 0x8f04145 21: e8 af 87 2e 00 call 0x2e87d5 26: fb sti 27: 83 fb 08 cmp $0x8,%ebx * 2a: 0f 83 c0 0a 00 00 jae 0xaf0 <-- trapping instruction 30: 48 8b 44 24 58 mov 0x58(%rsp),%rax 35: 4c 8d 3c c5 10 b8 5c lea -0x73a347f0(,%rax,8),%r15 3c: 8c 3d: 4c 89 f8 mov %r15,%rax