FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
6.1.129-syzkaller #0 Not tainted
------------------------------------------------------
syz.3.1686/8981 is trying to acquire lock:
ffffffff8d20a538 ((console_sem).lock){-.-.}-{2:2}, at: down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:139

but task is already holding lock:
ffff8880b8f3a9d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&rq->__lock){-.-.}-{2:2}:
       lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
       _raw_spin_lock_nested+0x2d/0x40 kernel/locking/spinlock.c:378
       raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537
       raw_spin_rq_lock kernel/sched/sched.h:1355 [inline]
       rq_lock kernel/sched/sched.h:1645 [inline]
       task_fork_fair+0x5d/0x350 kernel/sched/fair.c:11886
       sched_cgroup_fork+0x374/0x400 kernel/sched/core.c:4684
       copy_process+0x2482/0x40a0 kernel/fork.c:2383
       kernel_clone+0x222/0x920 kernel/fork.c:2681
       user_mode_thread+0x140/0x1b0 kernel/fork.c:2757
       rest_init+0x23/0x300 init/main.c:698
       start_kernel+0x0/0x53f init/main.c:893
       start_kernel+0x496/0x53f init/main.c:1140
       secondary_startup_64_no_verify+0xcf/0xdb

-> #1 (&p->pi_lock){-.-.}-{2:2}:
       lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
       try_to_wake_up+0xad/0x1250 kernel/sched/core.c:4110
       up+0x6e/0x90 kernel/locking/semaphore.c:191
       __up_console_sem+0x11a/0x1e0 kernel/printk/printk.c:260
       __console_unlock kernel/printk/printk.c:2697 [inline]
       console_unlock+0x591/0x7c0 kernel/printk/printk.c:2908
       vprintk_emit+0x523/0x740 kernel/printk/printk.c:2303
       dev_vprintk_emit+0x334/0x3d9 drivers/base/core.c:4932
       dev_printk_emit+0xd9/0x118 drivers/base/core.c:4943
       _dev_warn+0x11e/0x165 drivers/base/core.c:4999
       firmware_fallback_sysfs+0x674/0x940 drivers/base/firmware_loader/fallback.c:229
       _request_firmware+0xcf0/0x12b0 drivers/base/firmware_loader/main.c:884
       request_firmware_work_func+0x126/0x270 drivers/base/firmware_loader/main.c:1135
       process_one_work+0x917/0x1260 kernel/workqueue.c:2292
       worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
       kthread+0x28d/0x320 kernel/kthread.c:376
       ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

-> #0 ((console_sem).lock){-.-.}-{2:2}:
       check_prev_add kernel/locking/lockdep.c:3090 [inline]
       check_prevs_add kernel/locking/lockdep.c:3209 [inline]
       validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
       __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
       lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
       down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:139
       __down_trylock_console_sem+0x105/0x250 kernel/printk/printk.c:243
       console_trylock kernel/printk/printk.c:2650 [inline]
       console_trylock_spinning kernel/printk/printk.c:1896 [inline]
       vprintk_emit+0x1ee/0x740 kernel/printk/printk.c:2302
       _printk+0xd1/0x111 kernel/printk/printk.c:2328
       fail_dump lib/fault-inject.c:45 [inline]
       should_fail_ex+0x387/0x4d0 lib/fault-inject.c:147
       strncpy_from_user+0x32/0x360 lib/strncpy_from_user.c:118
       strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:186
       bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:204 [inline]
       ____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:310 [inline]
       bpf_probe_read_compat_str+0xe4/0x180 kernel/trace/bpf_trace.c:306
       bpf_prog_c1796171ffc7efef+0x35/0x37
       bpf_dispatcher_nop_func include/linux/bpf.h:1000 [inline]
       __bpf_prog_run include/linux/filter.h:603 [inline]
       bpf_prog_run include/linux/filter.h:610 [inline]
       __bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline]
       bpf_trace_run4+0x253/0x470 kernel/trace/bpf_trace.c:2325
       __traceiter_sched_switch+0x91/0xc0 include/trace/events/sched.h:222
       trace_sched_switch include/trace/events/sched.h:222 [inline]
       __schedule+0x2128/0x4570 kernel/sched/core.c:6557
       preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6729
       preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6753
       preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
       __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
       _raw_spin_unlock_irqrestore+0x128/0x130 kernel/locking/spinlock.c:194
       spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
       prepare_to_wait_event+0x3b5/0x3f0 kernel/sched/wait.c:335
       synchronize_rcu_expedited+0x766/0x930 kernel/rcu/tree_exp.h:977
       synchronize_rcu+0x11c/0x3f0 kernel/rcu/tree.c:3576
       rcu_sync_enter+0x1f6/0x340 kernel/rcu/sync.c:149
       percpu_down_write+0x69/0x2f0 kernel/locking/percpu-rwsem.c:231
       register_for_each_vma+0x32/0xc10 kernel/events/uprobes.c:1038
       __uprobe_register+0x57a/0x800 kernel/events/uprobes.c:1180
       trace_uprobe_enable kernel/trace/trace_uprobe.c:1087 [inline]
       probe_event_enable+0x3c3/0xc10 kernel/trace/trace_uprobe.c:1153
       perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline]
       perf_trace_event_init+0x449/0x940 kernel/trace/trace_event_perf.c:202
       perf_uprobe_init+0x127/0x190 kernel/trace/trace_event_perf.c:336
       perf_uprobe_event_init+0xff/0x180 kernel/events/core.c:10211
       perf_try_init_event+0x135/0x3e0 kernel/events/core.c:11547
       perf_init_event kernel/events/core.c:11611 [inline]
       perf_event_alloc+0xf86/0x2100 kernel/events/core.c:11903
       __do_sys_perf_event_open kernel/events/core.c:12439 [inline]
       __se_sys_perf_event_open+0x7d2/0x4960 kernel/events/core.c:12331
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

other info that might help us debug this:

Chain exists of:
  (console_sem).lock --> &p->pi_lock --> &rq->__lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&rq->__lock);
                               lock(&p->pi_lock);
                               lock(&rq->__lock);
  lock((console_sem).lock);

 *** DEADLOCK ***

7 locks held by syz.3.1686/8981:
 #0: ffffffff9740e508 (&pmus_srcu){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #0: ffffffff9740e508 (&pmus_srcu){....}-{0:0}, at: srcu_read_lock include/linux/srcu.h:165 [inline]
 #0: ffffffff9740e508 (&pmus_srcu){....}-{0:0}, at: perf_init_event kernel/events/core.c:11577 [inline]
 #0: ffffffff9740e508 (&pmus_srcu){....}-{0:0}, at: perf_event_alloc+0xc38/0x2100 kernel/events/core.c:11903
 #1: ffffffff8d383ba8 (event_mutex){+.+.}-{3:3}, at: perf_uprobe_init+0x11c/0x190 kernel/trace/trace_event_perf.c:335
 #2: ffff88801f350890 (&uprobe->register_rwsem){+.+.}-{3:3}, at: __uprobe_register+0x4c9/0x800 kernel/events/uprobes.c:1176
 #3: ffffffff8d3caf30 (dup_mmap_sem){++++}-{0:0}, at: register_for_each_vma+0x32/0xc10 kernel/events/uprobes.c:1038
 #4: ffffffff8d333cb8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline]
 #4: ffffffff8d333cb8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x4f0/0x930 kernel/rcu/tree_exp.h:962
 #5: ffff8880b8f3a9d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537
 #6: ffffffff8d32e680 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #6: ffffffff8d32e680 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #6: ffffffff8d32e680 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2283 [inline]
 #6: ffffffff8d32e680 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x16a/0x470 kernel/trace/bpf_trace.c:2325

stack backtrace:
CPU: 1 PID: 8981 Comm: syz.3.1686 Not tainted 6.1.129-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 check_noncircular+0x2fa/0x3b0 kernel/locking/lockdep.c:2170
 check_prev_add kernel/locking/lockdep.c:3090 [inline]
 check_prevs_add kernel/locking/lockdep.c:3209 [inline]
 validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
 down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:139
 __down_trylock_console_sem+0x105/0x250 kernel/printk/printk.c:243
 console_trylock kernel/printk/printk.c:2650 [inline]
 console_trylock_spinning kernel/printk/printk.c:1896 [inline]
 vprintk_emit+0x1ee/0x740 kernel/printk/printk.c:2302
 _printk+0xd1/0x111 kernel/printk/printk.c:2328
 fail_dump lib/fault-inject.c:45 [inline]
 should_fail_ex+0x387/0x4d0 lib/fault-inject.c:147
 strncpy_from_user+0x32/0x360 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:186
 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:204 [inline]
 ____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:310 [inline]
 bpf_probe_read_compat_str+0xe4/0x180 kernel/trace/bpf_trace.c:306
 bpf_prog_c1796171ffc7efef+0x35/0x37
 bpf_dispatcher_nop_func include/linux/bpf.h:1000 [inline]
 __bpf_prog_run include/linux/filter.h:603 [inline]
 bpf_prog_run include/linux/filter.h:610 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline]
 bpf_trace_run4+0x253/0x470 kernel/trace/bpf_trace.c:2325
 __traceiter_sched_switch+0x91/0xc0 include/trace/events/sched.h:222
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x2128/0x4570 kernel/sched/core.c:6557
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6729
 preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6753
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0x128/0x130 kernel/locking/spinlock.c:194
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 prepare_to_wait_event+0x3b5/0x3f0 kernel/sched/wait.c:335
 synchronize_rcu_expedited+0x766/0x930 kernel/rcu/tree_exp.h:977
 synchronize_rcu+0x11c/0x3f0 kernel/rcu/tree.c:3576
 rcu_sync_enter+0x1f6/0x340 kernel/rcu/sync.c:149
 percpu_down_write+0x69/0x2f0 kernel/locking/percpu-rwsem.c:231
 register_for_each_vma+0x32/0xc10 kernel/events/uprobes.c:1038
 __uprobe_register+0x57a/0x800 kernel/events/uprobes.c:1180
 trace_uprobe_enable kernel/trace/trace_uprobe.c:1087 [inline]
 probe_event_enable+0x3c3/0xc10 kernel/trace/trace_uprobe.c:1153
 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline]
 perf_trace_event_init+0x449/0x940 kernel/trace/trace_event_perf.c:202
 perf_uprobe_init+0x127/0x190 kernel/trace/trace_event_perf.c:336
 perf_uprobe_event_init+0xff/0x180 kernel/events/core.c:10211
 perf_try_init_event+0x135/0x3e0 kernel/events/core.c:11547
 perf_init_event kernel/events/core.c:11611 [inline]
 perf_event_alloc+0xf86/0x2100 kernel/events/core.c:11903
 __do_sys_perf_event_open kernel/events/core.c:12439 [inline]
 __se_sys_perf_event_open+0x7d2/0x4960 kernel/events/core.c:12331
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f019d58d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f019d3ff038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f019d7a5fa0 RCX: 00007f019d58d169
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000400000001080
RBP: 00007f019d3ff090 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000000000 R14: 00007f019d7a5fa0 R15: 00007ffd1c73e348
 </TASK>
CPU: 1 PID: 8981 Comm: syz.3.1686 Not tainted 6.1.129-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail_ex+0x3a6/0x4d0 lib/fault-inject.c:147
 strncpy_from_user+0x32/0x360 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:186
 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:204 [inline]
 ____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:310 [inline]
 bpf_probe_read_compat_str+0xe4/0x180 kernel/trace/bpf_trace.c:306
 bpf_prog_c1796171ffc7efef+0x35/0x37
 bpf_dispatcher_nop_func include/linux/bpf.h:1000 [inline]
 __bpf_prog_run include/linux/filter.h:603 [inline]
 bpf_prog_run include/linux/filter.h:610 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline]
 bpf_trace_run4+0x253/0x470 kernel/trace/bpf_trace.c:2325
 __traceiter_sched_switch+0x91/0xc0 include/trace/events/sched.h:222
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x2128/0x4570 kernel/sched/core.c:6557
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6729
 preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6753
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0x128/0x130 kernel/locking/spinlock.c:194
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 prepare_to_wait_event+0x3b5/0x3f0 kernel/sched/wait.c:335
 synchronize_rcu_expedited+0x766/0x930 kernel/rcu/tree_exp.h:977
 synchronize_rcu+0x11c/0x3f0 kernel/rcu/tree.c:3576
 rcu_sync_enter+0x1f6/0x340 kernel/rcu/sync.c:149
 percpu_down_write+0x69/0x2f0 kernel/locking/percpu-rwsem.c:231
 register_for_each_vma+0x32/0xc10 kernel/events/uprobes.c:1038
 __uprobe_register+0x57a/0x800 kernel/events/uprobes.c:1180
 trace_uprobe_enable kernel/trace/trace_uprobe.c:1087 [inline]
 probe_event_enable+0x3c3/0xc10 kernel/trace/trace_uprobe.c:1153
 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline]
 perf_trace_event_init+0x449/0x940 kernel/trace/trace_event_perf.c:202
 perf_uprobe_init+0x127/0x190 kernel/trace/trace_event_perf.c:336
 perf_uprobe_event_init+0xff/0x180 kernel/events/core.c:10211
 perf_try_init_event+0x135/0x3e0 kernel/events/core.c:11547
 perf_init_event kernel/events/core.c:11611 [inline]
 perf_event_alloc+0xf86/0x2100 kernel/events/core.c:11903
 __do_sys_perf_event_open kernel/events/core.c:12439 [inline]
 __se_sys_perf_event_open+0x7d2/0x4960 kernel/events/core.c:12331
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f019d58d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f019d3ff038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f019d7a5fa0 RCX: 00007f019d58d169
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000400000001080
RBP: 00007f019d3ff090 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000000000 R14: 00007f019d7a5fa0 R15: 00007ffd1c73e348
 </TASK>