FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 1
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.6.670/8665 is trying to acquire lock:
ffffffff8cd24160 (console_owner){-...}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:339 [inline]
ffffffff8cd24160 (console_owner){-...}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:232 [inline]
ffffffff8cd24160 (console_owner){-...}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:292 [inline]
ffffffff8cd24160 (console_owner){-...}-{0:0}, at: console_flush_all+0x10f/0xd00 kernel/printk/printk.c:2992

but task is already holding lock:
ffff8880b8e3c018 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xad/0x140 kernel/sched/core.c:566

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+0x32/0x50 kernel/locking/spinlock.c:378
       raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:558
       raw_spin_rq_lock kernel/sched/sched.h:1372 [inline]
       rq_lock kernel/sched/sched.h:1681 [inline]
       task_fork_fair+0x62/0x1f0 kernel/sched/fair.c:12688
       sched_cgroup_fork+0x333/0x3c0 kernel/sched/core.c:4816
       copy_process+0x21e4/0x3d70 kernel/fork.c:2614
       kernel_clone+0x21b/0x840 kernel/fork.c:2914
       user_mode_thread+0xde/0x130 kernel/fork.c:2992
       rest_init+0x27/0x300 init/main.c:709
       arch_call_rest_init+0xe/0x10 init/main.c:841
       start_kernel+0x459/0x4e0 init/main.c:1086
       x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:555
       copy_bootdata+0x0/0xe0 arch/x86/kernel/head64.c:536
       secondary_startup_64_no_verify+0x179/0x17b

-> #3 (&p->pi_lock){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162
       class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:522 [inline]
       try_to_wake_up+0x60/0x1140 kernel/sched/core.c:4232
       autoremove_wake_function+0x17/0x100 kernel/sched/wait.c:424
       __wake_up_common+0x2a4/0x4e0 kernel/sched/wait.c:107
       __wake_up_common_lock kernel/sched/wait.c:138 [inline]
       __wake_up+0x112/0x190 kernel/sched/wait.c:160
       tty_port_default_wakeup+0xa2/0xf0 drivers/tty/tty_port.c:69
       serial8250_tx_chars+0x6bd/0x8a0 drivers/tty/serial/8250/8250_port.c:1837
       serial8250_handle_irq+0x534/0x6e0 drivers/tty/serial/8250/8250_port.c:1944
       serial8250_default_handle_irq+0xb8/0x1a0 drivers/tty/serial/8250/8250_port.c:1964
       serial8250_interrupt+0x9f/0x1c0 drivers/tty/serial/8250/8250_core.c:127
       __handle_irq_event_percpu+0x276/0x930 kernel/irq/handle.c:158
       handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
       handle_irq_event+0x8b/0x1e0 kernel/irq/handle.c:210
       handle_edge_irq+0x247/0xb30 kernel/irq/chip.c:831
       generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
       handle_irq arch/x86/kernel/irq.c:240 [inline]
       __common_interrupt+0x13b/0x230 arch/x86/kernel/irq.c:259
       common_interrupt+0xb4/0xd0 arch/x86/kernel/irq.c:249
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:678
       native_save_fl arch/x86/include/asm/irqflags.h:26 [inline]
       arch_local_save_flags arch/x86/include/asm/irqflags.h:89 [inline]
       arch_local_irq_save arch/x86/include/asm/irqflags.h:107 [inline]
       lock_acquire+0x148/0x410 kernel/locking/lockdep.c:5750
       rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
       rcu_read_lock include/linux/rcupdate.h:786 [inline]
       blk_cgroup_congested+0x3b/0x220 block/blk-cgroup.c:2190
       __folio_throttle_swaprate+0x71/0x1a0 mm/swapfile.c:3649
       folio_throttle_swaprate include/linux/swap.h:649 [inline]
       wp_page_copy mm/memory.c:3120 [inline]
       do_wp_page+0x15e0/0x3630 mm/memory.c:3469
       handle_pte_fault mm/memory.c:5063 [inline]
       __handle_mm_fault mm/memory.c:5188 [inline]
       handle_mm_fault+0x12d4/0x4920 mm/memory.c:5353
       do_user_addr_fault+0x738/0x12e0 arch/x86/mm/fault.c:1373
       handle_page_fault arch/x86/mm/fault.c:1465 [inline]
       exc_page_fault+0x67/0x110 arch/x86/mm/fault.c:1521
       asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
       __put_user_nocheck_4+0x7/0x10 arch/x86/lib/putuser.S:96
       ____sys_recvmsg+0x388/0x5b0 net/socket.c:2827
       ___sys_recvmsg+0x1b6/0x510 net/socket.c:2856
       do_recvmmsg+0x360/0x7d0 net/socket.c:2950
       __sys_recvmmsg net/socket.c:3029 [inline]
       __do_sys_recvmmsg net/socket.c:3052 [inline]
       __se_sys_recvmmsg net/socket.c:3045 [inline]
       __x64_sys_recvmmsg+0x191/0x240 net/socket.c:3045
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #2 (&tty->write_wait){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162
       __wake_up_common_lock kernel/sched/wait.c:137 [inline]
       __wake_up+0xf8/0x190 kernel/sched/wait.c:160
       tty_port_default_wakeup+0xa2/0xf0 drivers/tty/tty_port.c:69
       serial8250_tx_chars+0x6bd/0x8a0 drivers/tty/serial/8250/8250_port.c:1837
       serial8250_handle_irq+0x534/0x6e0 drivers/tty/serial/8250/8250_port.c:1944
       serial8250_default_handle_irq+0xb8/0x1a0 drivers/tty/serial/8250/8250_port.c:1964
       serial8250_interrupt+0x9f/0x1c0 drivers/tty/serial/8250/8250_core.c:127
       __handle_irq_event_percpu+0x276/0x930 kernel/irq/handle.c:158
       handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
       handle_irq_event+0x8b/0x1e0 kernel/irq/handle.c:210
       handle_edge_irq+0x247/0xb30 kernel/irq/chip.c:831
       generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
       handle_irq arch/x86/kernel/irq.c:240 [inline]
       __common_interrupt+0x13b/0x230 arch/x86/kernel/irq.c:259
       common_interrupt+0xb4/0xd0 arch/x86/kernel/irq.c:249
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:678
       __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
       _raw_spin_unlock_irqrestore+0xa9/0x110 kernel/locking/spinlock.c:194
       spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
       uart_write+0x45b/0x5d0 drivers/tty/serial/serial_core.c:634
       process_output_block drivers/tty/n_tty.c:580 [inline]
       n_tty_write+0xd27/0x11d0 drivers/tty/n_tty.c:2395
       iterate_tty_write drivers/tty/tty_io.c:1017 [inline]
       file_tty_write+0x54b/0x980 drivers/tty/tty_io.c:1088
       call_write_iter include/linux/fs.h:2018 [inline]
       new_sync_write fs/read_write.c:491 [inline]
       vfs_write+0x43b/0x940 fs/read_write.c:584
       ksys_write+0x147/0x250 fs/read_write.c:637
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #1 (&port_lock_key){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162
       serial8250_console_write+0x16d/0x17a0 drivers/tty/serial/8250/8250_port.c:3433
       console_emit_next_record kernel/printk/printk.c:2944 [inline]
       console_flush_all+0x6cd/0xd00 kernel/printk/printk.c:3000
       console_unlock+0xae/0x340 kernel/printk/printk.c:3069
       vprintk_emit+0x477/0x600 kernel/printk/printk.c:2341
       _printk+0xd0/0x110 kernel/printk/printk.c:2366
       register_console+0x91b/0xe60 kernel/printk/printk.c:3583
       univ8250_console_init+0x45/0x50 drivers/tty/serial/8250/8250_core.c:717
       console_init+0x17b/0x5e0 kernel/printk/printk.c:3726
       start_kernel+0x2c0/0x4e0 init/main.c:1022
       x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:555
       copy_bootdata+0x0/0xe0 arch/x86/kernel/head64.c:536
       secondary_startup_64_no_verify+0x179/0x17b

-> #0 (console_owner){-...}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137
       lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
       console_lock_spinning_enable kernel/printk/printk.c:1871 [inline]
       console_emit_next_record kernel/printk/printk.c:2938 [inline]
       console_flush_all+0x693/0xd00 kernel/printk/printk.c:3000
       console_unlock+0xae/0x340 kernel/printk/printk.c:3069
       vprintk_emit+0x477/0x600 kernel/printk/printk.c:2341
       _printk+0xd0/0x110 kernel/printk/printk.c:2366
       fail_dump lib/fault-inject.c:45 [inline]
       should_fail_ex+0x37e/0x4d0 lib/fault-inject.c:153
       strncpy_from_user+0x36/0x2e0 lib/strncpy_from_user.c:118
       strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:186
       bpf_trace_copy_string kernel/bpf/helpers.c:755 [inline]
       bpf_bprintf_prepare+0xb9b/0x1400 kernel/bpf/helpers.c:980
       ____bpf_trace_printk kernel/trace/bpf_trace.c:381 [inline]
       bpf_trace_printk+0xdc/0x190 kernel/trace/bpf_trace.c:371
       bpf_prog_7c77c7e0f6645ad8+0x3d/0x3f
       bpf_dispatcher_nop_func include/linux/bpf.h:1224 [inline]
       __bpf_prog_run include/linux/filter.h:612 [inline]
       bpf_prog_run include/linux/filter.h:619 [inline]
       __bpf_trace_run kernel/trace/bpf_trace.c:2322 [inline]
       bpf_trace_run2+0x1d1/0x3c0 kernel/trace/bpf_trace.c:2361
       __bpf_trace_contention_begin+0xdd/0x130 include/trace/events/lock.h:95
       trace_contention_begin+0xe9/0x110 include/trace/events/lock.h:95
       __pv_queued_spin_lock_slowpath+0xe0/0x9d0 kernel/locking/qspinlock.c:405
       pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:586 [inline]
       queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
       queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
       do_raw_spin_lock+0x24e/0x2c0 kernel/locking/spinlock_debug.c:115
       raw_spin_rq_lock_nested+0xad/0x140 kernel/sched/core.c:566
       raw_spin_rq_lock kernel/sched/sched.h:1372 [inline]
       rq_lock kernel/sched/sched.h:1681 [inline]
       __schedule+0x2dd/0x44d0 kernel/sched/core.c:6613
       preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6866
       preempt_schedule+0xab/0xc0 kernel/sched/core.c:6890
       preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
       unwind_next_frame+0x200f/0x2970 arch/x86/kernel/unwind_orc.c:672
       arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
       stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
       save_stack+0xf7/0x1f0 mm/page_owner.c:128
       __set_page_owner+0x1d/0x60 mm/page_owner.c:192
       set_page_owner include/linux/page_owner.h:31 [inline]
       post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
       prep_new_page mm/page_alloc.c:1561 [inline]
       get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191
       __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457
       __folio_alloc+0x10/0x20 mm/page_alloc.c:4489
       vma_alloc_folio+0x47a/0x8f0 mm/mempolicy.c:2242
       do_anonymous_page mm/memory.c:4150 [inline]
       do_pte_missing mm/memory.c:3687 [inline]
       handle_pte_fault mm/memory.c:5047 [inline]
       __handle_mm_fault mm/memory.c:5188 [inline]
       handle_mm_fault+0x1a38/0x4920 mm/memory.c:5353
       do_user_addr_fault+0x738/0x12e0 arch/x86/mm/fault.c:1373
       handle_page_fault arch/x86/mm/fault.c:1465 [inline]
       exc_page_fault+0x67/0x110 arch/x86/mm/fault.c:1521
       asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608

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.6.670/8665:
 #0: ffff88807b92b120 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
 #0: ffff88807b92b120 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5380 [inline]
 #0: ffff88807b92b120 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x300 mm/memory.c:5440
 #1: ffff8880b8e3c018 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xad/0x140 kernel/sched/core.c:566
 #2: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
 #2: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
 #2: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2321 [inline]
 #2: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0xde/0x3c0 kernel/trace/bpf_trace.c:2361
 #3: ffffffff8cd24240 (console_lock){+.+.}-{0:0}, at: _printk+0xd0/0x110 kernel/printk/printk.c:2366
 #4: ffffffff8cc0ba50 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:339 [inline]
 #4: ffffffff8cc0ba50 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:232 [inline]
 #4: ffffffff8cc0ba50 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:292 [inline]
 #4: ffffffff8cc0ba50 (console_srcu){....}-{0:0}, at: console_flush_all+0x10f/0xd00 kernel/printk/printk.c:2992

stack backtrace:
CPU: 1 PID: 8665 Comm: syz.6.670 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 check_noncircular+0x2bd/0x3c0 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137
 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
 console_lock_spinning_enable kernel/printk/printk.c:1871 [inline]
 console_emit_next_record kernel/printk/printk.c:2938 [inline]
 console_flush_all+0x693/0xd00 kernel/printk/printk.c:3000
 console_unlock+0xae/0x340 kernel/printk/printk.c:3069
 vprintk_emit+0x477/0x600 kernel/printk/printk.c:2341
 _printk+0xd0/0x110 kernel/printk/printk.c:2366
 fail_dump lib/fault-inject.c:45 [inline]
 should_fail_ex+0x37e/0x4d0 lib/fault-inject.c:153
 strncpy_from_user+0x36/0x2e0 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:186
 bpf_trace_copy_string kernel/bpf/helpers.c:755 [inline]
 bpf_bprintf_prepare+0xb9b/0x1400 kernel/bpf/helpers.c:980
 ____bpf_trace_printk kernel/trace/bpf_trace.c:381 [inline]
 bpf_trace_printk+0xdc/0x190 kernel/trace/bpf_trace.c:371
 bpf_prog_7c77c7e0f6645ad8+0x3d/0x3f
 bpf_dispatcher_nop_func include/linux/bpf.h:1224 [inline]
 __bpf_prog_run include/linux/filter.h:612 [inline]
 bpf_prog_run include/linux/filter.h:619 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2322 [inline]
 bpf_trace_run2+0x1d1/0x3c0 kernel/trace/bpf_trace.c:2361
 __bpf_trace_contention_begin+0xdd/0x130 include/trace/events/lock.h:95
 trace_contention_begin+0xe9/0x110 include/trace/events/lock.h:95
 __pv_queued_spin_lock_slowpath+0xe0/0x9d0 kernel/locking/qspinlock.c:405
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:586 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x24e/0x2c0 kernel/locking/spinlock_debug.c:115
 raw_spin_rq_lock_nested+0xad/0x140 kernel/sched/core.c:566
 raw_spin_rq_lock kernel/sched/sched.h:1372 [inline]
 rq_lock kernel/sched/sched.h:1681 [inline]
 __schedule+0x2dd/0x44d0 kernel/sched/core.c:6613
 preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6866
 preempt_schedule+0xab/0xc0 kernel/sched/core.c:6890
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 unwind_next_frame+0x200f/0x2970 arch/x86/kernel/unwind_orc.c:672
 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 save_stack+0xf7/0x1f0 mm/page_owner.c:128
 __set_page_owner+0x1d/0x60 mm/page_owner.c:192
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
 prep_new_page mm/page_alloc.c:1561 [inline]
 get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191
 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457
 __folio_alloc+0x10/0x20 mm/page_alloc.c:4489
 vma_alloc_folio+0x47a/0x8f0 mm/mempolicy.c:2242
 do_anonymous_page mm/memory.c:4150 [inline]
 do_pte_missing mm/memory.c:3687 [inline]
 handle_pte_fault mm/memory.c:5047 [inline]
 __handle_mm_fault mm/memory.c:5188 [inline]
 handle_mm_fault+0x1a38/0x4920 mm/memory.c:5353
 do_user_addr_fault+0x738/0x12e0 arch/x86/mm/fault.c:1373
 handle_page_fault arch/x86/mm/fault.c:1465 [inline]
 exc_page_fault+0x67/0x110 arch/x86/mm/fault.c:1521
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7faf3e050943
Code: 1f 84 00 00 00 00 00 3d 00 01 00 00 75 29 45 31 f6 48 83 c4 18 44 89 f0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 40 00 49 8b 0f <44> 88 34 01 49 83 47 10 01 eb 92 66 90 8d 90 ff fe ff ff 83 fa 1c
RSP: 002b:00007faf3ef834a0 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 00007faf3ef83540 RCX: 00007faf33ff7000
RDX: 00007faf3ef836e0 RSI: 0000000000000007 RDI: 00007faf3ef835e0
RBP: 000000000000013b R08: 0000000000000008 R09: 00000000000000b8
R10: 00000000000000c4 R11: 00007faf3ef83540 R12: 00007faf3ef83540
R13: 00007faf3e22fc40 R14: 00000000000000eb R15: 00007faf3ef835e0
 </TASK>
CPU: 1 PID: 8665 Comm: syz.6.670 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail_ex+0x39d/0x4d0 lib/fault-inject.c:153
 strncpy_from_user+0x36/0x2e0 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:186
 bpf_trace_copy_string kernel/bpf/helpers.c:755 [inline]
 bpf_bprintf_prepare+0xb9b/0x1400 kernel/bpf/helpers.c:980
 ____bpf_trace_printk kernel/trace/bpf_trace.c:381 [inline]
 bpf_trace_printk+0xdc/0x190 kernel/trace/bpf_trace.c:371
 bpf_prog_7c77c7e0f6645ad8+0x3d/0x3f
 bpf_dispatcher_nop_func include/linux/bpf.h:1224 [inline]
 __bpf_prog_run include/linux/filter.h:612 [inline]
 bpf_prog_run include/linux/filter.h:619 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2322 [inline]
 bpf_trace_run2+0x1d1/0x3c0 kernel/trace/bpf_trace.c:2361
 __bpf_trace_contention_begin+0xdd/0x130 include/trace/events/lock.h:95
 trace_contention_begin+0xe9/0x110 include/trace/events/lock.h:95
 __pv_queued_spin_lock_slowpath+0xe0/0x9d0 kernel/locking/qspinlock.c:405
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:586 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x24e/0x2c0 kernel/locking/spinlock_debug.c:115
 raw_spin_rq_lock_nested+0xad/0x140 kernel/sched/core.c:566
 raw_spin_rq_lock kernel/sched/sched.h:1372 [inline]
 rq_lock kernel/sched/sched.h:1681 [inline]
 __schedule+0x2dd/0x44d0 kernel/sched/core.c:6613
 preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6866
 preempt_schedule+0xab/0xc0 kernel/sched/core.c:6890
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 unwind_next_frame+0x200f/0x2970 arch/x86/kernel/unwind_orc.c:672
 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 save_stack+0xf7/0x1f0 mm/page_owner.c:128
 __set_page_owner+0x1d/0x60 mm/page_owner.c:192
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
 prep_new_page mm/page_alloc.c:1561 [inline]
 get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191
 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457
 __folio_alloc+0x10/0x20 mm/page_alloc.c:4489
 vma_alloc_folio+0x47a/0x8f0 mm/mempolicy.c:2242
 do_anonymous_page mm/memory.c:4150 [inline]
 do_pte_missing mm/memory.c:3687 [inline]
 handle_pte_fault mm/memory.c:5047 [inline]
 __handle_mm_fault mm/memory.c:5188 [inline]
 handle_mm_fault+0x1a38/0x4920 mm/memory.c:5353
 do_user_addr_fault+0x738/0x12e0 arch/x86/mm/fault.c:1373
 handle_page_fault arch/x86/mm/fault.c:1465 [inline]
 exc_page_fault+0x67/0x110 arch/x86/mm/fault.c:1521
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7faf3e050943
Code: 1f 84 00 00 00 00 00 3d 00 01 00 00 75 29 45 31 f6 48 83 c4 18 44 89 f0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 40 00 49 8b 0f <44> 88 34 01 49 83 47 10 01 eb 92 66 90 8d 90 ff fe ff ff 83 fa 1c
RSP: 002b:00007faf3ef834a0 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 00007faf3ef83540 RCX: 00007faf33ff7000
RDX: 00007faf3ef836e0 RSI: 0000000000000007 RDI: 00007faf3ef835e0
RBP: 000000000000013b R08: 0000000000000008 R09: 00000000000000b8
R10: 00000000000000c4 R11: 00007faf3ef83540 R12: 00007faf3ef83540
R13: 00007faf3e22fc40 R14: 00000000000000eb R15: 00007faf3ef835e0
 </TASK>
loop6: detected capacity change from 0 to 128