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.5.1738/10155 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:
ffff8880b8e3a9d8 (&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_user_str kernel/trace/bpf_trace.c:213 [inline]
       bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:210
       bpf_prog_38a0dc8fec2b2ac3+0x38/0x3a
       bpf_dispatcher_nop_func include/linux/bpf.h:1000 [inline]
       __bpf_prog_run include/linux/filter.h:596 [inline]
       bpf_prog_run include/linux/filter.h:610 [inline]
       __bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline]
       bpf_trace_run4+0x3c3/0x470 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_irq+0xf7/0x1c0 kernel/sched/core.c:6872
       irqentry_exit+0x53/0x80 kernel/entry/common.c:439
       asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
       perf_event_text_poke+0x24f/0x320
       text_poke_bp_batch+0x4d0/0x940 arch/x86/kernel/alternative.c:1587
       text_poke_bp+0xc8/0x140 arch/x86/kernel/alternative.c:1771
       __static_call_transform+0x333/0x560 arch/x86/kernel/static_call.c:109
       arch_static_call_transform+0x4e/0x90 arch/x86/kernel/static_call.c:161
       __static_call_update+0xd4/0x5d0 kernel/static_call_inline.c:136
       bpf_dispatcher_update kernel/bpf/dispatcher.c:126 [inline]
       bpf_dispatcher_change_prog+0xece/0xf80 kernel/bpf/dispatcher.c:170
       bpf_prog_test_run_xdp+0x721/0x1130 net/bpf/test_run.c:1390
       bpf_prog_test_run+0x32f/0x3a0 kernel/bpf/syscall.c:3690
       __sys_bpf+0x3eb/0x6c0 kernel/bpf/syscall.c:5043
       __do_sys_bpf kernel/bpf/syscall.c:5129 [inline]
       __se_sys_bpf kernel/bpf/syscall.c:5127 [inline]
       __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5127
       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 ***

6 locks held by syz.5.1738/10155:
 #0: ffffffff8e552088 (bpf_dispatcher_xdp.mutex){+.+.}-{3:3}, at: bpf_dispatcher_change_prog+0xa2/0xf80 kernel/bpf/dispatcher.c:146
 #1: ffffffff8d1cad10 (cpu_hotplug_lock){++++}-{0:0}, at: __static_call_update+0x7f/0x5d0 kernel/static_call_inline.c:128
 #2: ffffffff8d3c5f08 (static_call_mutex){+.+.}-{3:3}, at: static_call_lock kernel/static_call_inline.c:25 [inline]
 #2: ffffffff8d3c5f08 (static_call_mutex){+.+.}-{3:3}, at: __static_call_update+0x8d/0x5d0 kernel/static_call_inline.c:129
 #3: ffffffff8d1dff88 (text_mutex){+.+.}-{3:3}, at: arch_static_call_transform+0x20/0x90 arch/x86/kernel/static_call.c:157
 #4: ffff8880b8e3a9d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537
 #5: ffffffff8d32e680 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #5: ffffffff8d32e680 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #5: ffffffff8d32e680 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2283 [inline]
 #5: ffffffff8d32e680 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x16a/0x470 kernel/trace/bpf_trace.c:2325

stack backtrace:
CPU: 0 PID: 10155 Comm: syz.5.1738 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_user_str kernel/trace/bpf_trace.c:213 [inline]
 bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:210
 bpf_prog_38a0dc8fec2b2ac3+0x38/0x3a
 bpf_dispatcher_nop_func include/linux/bpf.h:1000 [inline]
 __bpf_prog_run include/linux/filter.h:596 [inline]
 bpf_prog_run include/linux/filter.h:610 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline]
 bpf_trace_run4+0x3c3/0x470 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_irq+0xf7/0x1c0 kernel/sched/core.c:6872
 irqentry_exit+0x53/0x80 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:perf_event_text_poke+0x24f/0x320 kernel/events/core.c:9252
Code: 3c 38 00 74 05 e8 a1 7a 31 00 48 8b 44 24 28 48 89 84 24 88 00 00 00 48 c7 c7 e0 75 b0 81 4c 89 f6 31 d2 e8 c3 b9 ff ff eb 05 <e8> bc 21 da ff 48 c7 44 24 40 0e 36 e0 45 43 c7 04 27 00 00 00 00
RSP: 0018:ffffc900043e73e0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81b0737c
RDX: ffff88802730bb80 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900043e74f0 R08: ffffffff81b0738b R09: fffffbfff1d414f8
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff9200087ce84
R13: 0000000000000005 R14: ffffffff8ae06140 R15: dffffc0000000000
 text_poke_bp_batch+0x4d0/0x940 arch/x86/kernel/alternative.c:1587
 text_poke_bp+0xc8/0x140 arch/x86/kernel/alternative.c:1771
 __static_call_transform+0x333/0x560 arch/x86/kernel/static_call.c:109
 arch_static_call_transform+0x4e/0x90 arch/x86/kernel/static_call.c:161
 __static_call_update+0xd4/0x5d0 kernel/static_call_inline.c:136
 bpf_dispatcher_update kernel/bpf/dispatcher.c:126 [inline]
 bpf_dispatcher_change_prog+0xece/0xf80 kernel/bpf/dispatcher.c:170
 bpf_prog_test_run_xdp+0x721/0x1130 net/bpf/test_run.c:1390
 bpf_prog_test_run+0x32f/0x3a0 kernel/bpf/syscall.c:3690
 __sys_bpf+0x3eb/0x6c0 kernel/bpf/syscall.c:5043
 __do_sys_bpf kernel/bpf/syscall.c:5129 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5127 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5127
 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: 0033:0x7fd7c518d169
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:00007fd7c60d6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fd7c53a5fa0 RCX: 00007fd7c518d169
RDX: 0000000000000050 RSI: 0000400000000600 RDI: 000000000000000a
RBP: 00007fd7c60d6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007fd7c53a5fa0 R15: 00007ffc29a8e928
 </TASK>
CPU: 0 PID: 10155 Comm: syz.5.1738 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_user_str kernel/trace/bpf_trace.c:213 [inline]
 bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:210
 bpf_prog_38a0dc8fec2b2ac3+0x38/0x3a
 bpf_dispatcher_nop_func include/linux/bpf.h:1000 [inline]
 __bpf_prog_run include/linux/filter.h:596 [inline]
 bpf_prog_run include/linux/filter.h:610 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline]
 bpf_trace_run4+0x3c3/0x470 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_irq+0xf7/0x1c0 kernel/sched/core.c:6872
 irqentry_exit+0x53/0x80 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:perf_event_text_poke+0x24f/0x320 kernel/events/core.c:9252
Code: 3c 38 00 74 05 e8 a1 7a 31 00 48 8b 44 24 28 48 89 84 24 88 00 00 00 48 c7 c7 e0 75 b0 81 4c 89 f6 31 d2 e8 c3 b9 ff ff eb 05 <e8> bc 21 da ff 48 c7 44 24 40 0e 36 e0 45 43 c7 04 27 00 00 00 00
RSP: 0018:ffffc900043e73e0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81b0737c
RDX: ffff88802730bb80 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900043e74f0 R08: ffffffff81b0738b R09: fffffbfff1d414f8
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff9200087ce84
R13: 0000000000000005 R14: ffffffff8ae06140 R15: dffffc0000000000
 text_poke_bp_batch+0x4d0/0x940 arch/x86/kernel/alternative.c:1587
 text_poke_bp+0xc8/0x140 arch/x86/kernel/alternative.c:1771
 __static_call_transform+0x333/0x560 arch/x86/kernel/static_call.c:109
 arch_static_call_transform+0x4e/0x90 arch/x86/kernel/static_call.c:161
 __static_call_update+0xd4/0x5d0 kernel/static_call_inline.c:136
 bpf_dispatcher_update kernel/bpf/dispatcher.c:126 [inline]
 bpf_dispatcher_change_prog+0xece/0xf80 kernel/bpf/dispatcher.c:170
 bpf_prog_test_run_xdp+0x721/0x1130 net/bpf/test_run.c:1390
 bpf_prog_test_run+0x32f/0x3a0 kernel/bpf/syscall.c:3690
 __sys_bpf+0x3eb/0x6c0 kernel/bpf/syscall.c:5043
 __do_sys_bpf kernel/bpf/syscall.c:5129 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5127 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5127
 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: 0033:0x7fd7c518d169
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:00007fd7c60d6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fd7c53a5fa0 RCX: 00007fd7c518d169
RDX: 0000000000000050 RSI: 0000400000000600 RDI: 000000000000000a
RBP: 00007fd7c60d6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007fd7c53a5fa0 R15: 00007ffc29a8e928
 </TASK>
----------------
Code disassembly (best guess):
   0:	3c 38                	cmp    $0x38,%al
   2:	00 74 05 e8          	add    %dh,-0x18(%rbp,%rax,1)
   6:	a1 7a 31 00 48 8b 44 	movabs 0x2824448b4800317a,%eax
   d:	24 28
   f:	48 89 84 24 88 00 00 	mov    %rax,0x88(%rsp)
  16:	00
  17:	48 c7 c7 e0 75 b0 81 	mov    $0xffffffff81b075e0,%rdi
  1e:	4c 89 f6             	mov    %r14,%rsi
  21:	31 d2                	xor    %edx,%edx
  23:	e8 c3 b9 ff ff       	call   0xffffb9eb
  28:	eb 05                	jmp    0x2f
* 2a:	e8 bc 21 da ff       	call   0xffda21eb <-- trapping instruction
  2f:	48 c7 44 24 40 0e 36 	movq   $0x45e0360e,0x40(%rsp)
  36:	e0 45
  38:	43 c7 04 27 00 00 00 	movl   $0x0,(%r15,%r12,1)
  3f:	00