FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
6.11.0-syzkaller-g88264981f208 #0 Not tainted
------------------------------------------------------
syz.0.575/7708 is trying to acquire lock:
ffffffff8e813558 ((console_sem).lock){-...}-{2:2}, at: down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139

but task is already holding lock:
ffff8880b872c898 (hrtimer_bases.lock){-.-.}-{2:2}, at: lock_hrtimer_base kernel/time/hrtimer.c:175 [inline]
ffff8880b872c898 (hrtimer_bases.lock){-.-.}-{2:2}, at: hrtimer_start_range_ns+0x109/0xca0 kernel/time/hrtimer.c:1300

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (hrtimer_bases.lock){-.-.}-{2:2}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5822
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
       lock_hrtimer_base kernel/time/hrtimer.c:175 [inline]
       hrtimer_start_range_ns+0x109/0xca0 kernel/time/hrtimer.c:1300
       hrtimer_start include/linux/hrtimer.h:275 [inline]
       start_dl_timer+0x36a/0x4d0 kernel/sched/deadline.c:1170
       enqueue_dl_entity+0x10ed/0x1d60 kernel/sched/deadline.c:2053
       dl_server_start+0xc9/0x240 kernel/sched/deadline.c:1650
       enqueue_task_fair+0xb5c/0xea0 kernel/sched/fair.c:7040
       enqueue_task+0x1a5/0x300 kernel/sched/core.c:2020
       activate_task kernel/sched/core.c:2062 [inline]
       wake_up_new_task+0x566/0xc30 kernel/sched/core.c:4816
       kernel_clone+0x4ee/0x8f0 kernel/fork.c:2818
       user_mode_thread+0x132/0x1a0 kernel/fork.c:2865
       rest_init+0x23/0x300 init/main.c:712
       start_kernel+0x47f/0x500 init/main.c:1105
       x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507
       x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488
       common_startup_64+0x13e/0x147

-> #2 (&rq->__lock){-.-.}-{2:2}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5822
       _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
       raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:593
       raw_spin_rq_lock kernel/sched/sched.h:1503 [inline]
       task_rq_lock+0xc6/0x360 kernel/sched/core.c:695
       cgroup_move_task+0x92/0x2d0 kernel/sched/psi.c:1161
       css_set_move_task+0x72e/0x950 kernel/cgroup/cgroup.c:898
       cgroup_post_fork+0x256/0x880 kernel/cgroup/cgroup.c:6692
       copy_process+0x39e9/0x3d50 kernel/fork.c:2601
       kernel_clone+0x226/0x8f0 kernel/fork.c:2787
       user_mode_thread+0x132/0x1a0 kernel/fork.c:2865
       rest_init+0x23/0x300 init/main.c:712
       start_kernel+0x47f/0x500 init/main.c:1105
       x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507
       x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488
       common_startup_64+0x13e/0x147

-> #1 (&p->pi_lock){-.-.}-{2:2}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5822
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
       class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline]
       try_to_wake_up+0xb0/0x1480 kernel/sched/core.c:4154
       up+0x72/0x90 kernel/locking/semaphore.c:191
       __up_console_sem kernel/printk/printk.c:343 [inline]
       __console_unlock+0x123/0x1f0 kernel/printk/printk.c:2844
       __console_flush_and_unlock kernel/printk/printk.c:3241 [inline]
       console_unlock+0x18f/0x3b0 kernel/printk/printk.c:3279
       vprintk_emit+0x730/0xa10 kernel/printk/printk.c:2407
       dev_vprintk_emit+0x2ae/0x330 drivers/base/core.c:4912
       dev_printk_emit+0xdd/0x120 drivers/base/core.c:4923
       _dev_warn+0x122/0x170 drivers/base/core.c:4979
       firmware_fallback_sysfs+0x4cf/0x9e0 drivers/base/firmware_loader/fallback.c:233
       _request_firmware+0xcf5/0x12b0 drivers/base/firmware_loader/main.c:914
       request_firmware_work_func+0x12a/0x280 drivers/base/firmware_loader/main.c:1165
       process_one_work kernel/workqueue.c:3229 [inline]
       process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
       worker_thread+0x870/0xd30 kernel/workqueue.c:3391
       kthread+0x2f0/0x390 kernel/kthread.c:389
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

-> #0 ((console_sem).lock){-...}-{2:2}:
       check_prev_add kernel/locking/lockdep.c:3158 [inline]
       check_prevs_add kernel/locking/lockdep.c:3277 [inline]
       validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3901
       __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5199
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5822
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
       down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139
       __down_trylock_console_sem+0x109/0x250 kernel/printk/printk.c:326
       console_trylock kernel/printk/printk.c:2827 [inline]
       console_trylock_spinning kernel/printk/printk.c:1990 [inline]
       vprintk_emit+0x3d7/0xa10 kernel/printk/printk.c:2406
       _printk+0xd5/0x120 kernel/printk/printk.c:2432
       fail_dump lib/fault-inject.c:46 [inline]
       should_fail_ex+0x391/0x4e0 lib/fault-inject.c:154
       strncpy_from_user+0x36/0x2e0 lib/strncpy_from_user.c:118
       strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:186
       bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:215 [inline]
       ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:224 [inline]
       bpf_probe_read_user_str+0x2a/0x70 kernel/trace/bpf_trace.c:221
       bpf_prog_99b56f93a3ca5fea+0x4b/0x4d
       bpf_dispatcher_nop_func include/linux/bpf.h:1257 [inline]
       __bpf_prog_run include/linux/filter.h:701 [inline]
       bpf_prog_run include/linux/filter.h:708 [inline]
       __bpf_trace_run kernel/trace/bpf_trace.c:2318 [inline]
       bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2359
       __traceiter_hrtimer_start+0x76/0xd0 include/trace/events/timer.h:222
       trace_hrtimer_start include/trace/events/timer.h:222 [inline]
       debug_activate kernel/time/hrtimer.c:479 [inline]
       enqueue_hrtimer+0x35a/0x3c0 kernel/time/hrtimer.c:1085
       __hrtimer_start_range_ns kernel/time/hrtimer.c:1260 [inline]
       hrtimer_start_range_ns+0xac8/0xca0 kernel/time/hrtimer.c:1302
       hrtimer_start include/linux/hrtimer.h:275 [inline]
       perf_swevent_start_hrtimer kernel/events/core.c:11254 [inline]
       cpu_clock_event_start kernel/events/core.c:11312 [inline]
       cpu_clock_event_add+0x180/0x1a0 kernel/events/core.c:11324
       event_sched_in+0x832/0xe90 kernel/events/core.c:2620
       group_sched_in kernel/events/core.c:2653 [inline]
       merge_sched_in kernel/events/core.c:3931 [inline]
       visit_groups_merge+0x1521/0x2fd0 kernel/events/core.c:3876
       pmu_groups_sched_in kernel/events/core.c:3958 [inline]
       __pmu_ctx_sched_in+0x1aa/0x230 kernel/events/core.c:3970
       ctx_sched_in+0x4c2/0x600 kernel/events/core.c:4021
       ctx_resched+0x560/0x900 kernel/events/core.c:2807
       __perf_install_in_context+0x647/0x850 kernel/events/core.c:2882
       remote_function+0xef/0x170 kernel/events/core.c:92
       csd_do_func kernel/smp.c:134 [inline]
       generic_exec_single+0x336/0x9b0 kernel/smp.c:433
       smp_call_function_single+0x3fa/0x1990 kernel/smp.c:676
       task_function_call kernel/events/core.c:120 [inline]
       perf_install_in_context+0x71a/0xb20 kernel/events/core.c:2985
       __do_sys_perf_event_open kernel/events/core.c:13006 [inline]
       __se_sys_perf_event_open+0x31c5/0x38d0 kernel/events/core.c:12658
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

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

 Possible unsafe locking scenario:

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

 *** DEADLOCK ***

6 locks held by syz.0.575/7708:
 #0: ffff88802960b9d8 (&sig->exec_update_lock){++++}-{3:3}, at: __do_sys_perf_event_open kernel/events/core.c:12797 [inline]
 #0: ffff88802960b9d8 (&sig->exec_update_lock){++++}-{3:3}, at: __se_sys_perf_event_open+0xe64/0x38d0 kernel/events/core.c:12658
 #1: ffff88802fa6bca8 (&ctx->mutex){+.+.}-{3:3}, at: __do_sys_perf_event_open kernel/events/core.c:12821 [inline]
 #1: ffff88802fa6bca8 (&ctx->mutex){+.+.}-{3:3}, at: __se_sys_perf_event_open+0x13f9/0x38d0 kernel/events/core.c:12658
 #2: ffff8880b87376c8 (&cpuctx_lock){-.-.}-{2:2}, at: __perf_install_in_context+0xdc/0x850 kernel/events/core.c:2843
 #3: ffff88802fa6bc18 (&ctx->lock){-.-.}-{2:2}, at: __perf_install_in_context+0x110/0x850 kernel/events/core.c:2845
 #4: ffff8880b872c898 (hrtimer_bases.lock){-.-.}-{2:2}, at: lock_hrtimer_base kernel/time/hrtimer.c:175 [inline]
 #4: ffff8880b872c898 (hrtimer_bases.lock){-.-.}-{2:2}, at: hrtimer_start_range_ns+0x109/0xca0 kernel/time/hrtimer.c:1300
 #5: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #5: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #5: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2317 [inline]
 #5: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x540 kernel/trace/bpf_trace.c:2359

stack backtrace:
CPU: 1 UID: 0 PID: 7708 Comm: syz.0.575 Not tainted 6.11.0-syzkaller-g88264981f208 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2203
 check_prev_add kernel/locking/lockdep.c:3158 [inline]
 check_prevs_add kernel/locking/lockdep.c:3277 [inline]
 validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3901
 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5199
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5822
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
 down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139
 __down_trylock_console_sem+0x109/0x250 kernel/printk/printk.c:326
 console_trylock kernel/printk/printk.c:2827 [inline]
 console_trylock_spinning kernel/printk/printk.c:1990 [inline]
 vprintk_emit+0x3d7/0xa10 kernel/printk/printk.c:2406
 _printk+0xd5/0x120 kernel/printk/printk.c:2432
 fail_dump lib/fault-inject.c:46 [inline]
 should_fail_ex+0x391/0x4e0 lib/fault-inject.c:154
 strncpy_from_user+0x36/0x2e0 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:186
 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:215 [inline]
 ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:224 [inline]
 bpf_probe_read_user_str+0x2a/0x70 kernel/trace/bpf_trace.c:221
 bpf_prog_99b56f93a3ca5fea+0x4b/0x4d
 bpf_dispatcher_nop_func include/linux/bpf.h:1257 [inline]
 __bpf_prog_run include/linux/filter.h:701 [inline]
 bpf_prog_run include/linux/filter.h:708 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2318 [inline]
 bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2359
 __traceiter_hrtimer_start+0x76/0xd0 include/trace/events/timer.h:222
 trace_hrtimer_start include/trace/events/timer.h:222 [inline]
 debug_activate kernel/time/hrtimer.c:479 [inline]
 enqueue_hrtimer+0x35a/0x3c0 kernel/time/hrtimer.c:1085
 __hrtimer_start_range_ns kernel/time/hrtimer.c:1260 [inline]
 hrtimer_start_range_ns+0xac8/0xca0 kernel/time/hrtimer.c:1302
 hrtimer_start include/linux/hrtimer.h:275 [inline]
 perf_swevent_start_hrtimer kernel/events/core.c:11254 [inline]
 cpu_clock_event_start kernel/events/core.c:11312 [inline]
 cpu_clock_event_add+0x180/0x1a0 kernel/events/core.c:11324
 event_sched_in+0x832/0xe90 kernel/events/core.c:2620
 group_sched_in kernel/events/core.c:2653 [inline]
 merge_sched_in kernel/events/core.c:3931 [inline]
 visit_groups_merge+0x1521/0x2fd0 kernel/events/core.c:3876
 pmu_groups_sched_in kernel/events/core.c:3958 [inline]
 __pmu_ctx_sched_in+0x1aa/0x230 kernel/events/core.c:3970
 ctx_sched_in+0x4c2/0x600 kernel/events/core.c:4021
 ctx_resched+0x560/0x900 kernel/events/core.c:2807
 __perf_install_in_context+0x647/0x850 kernel/events/core.c:2882
 remote_function+0xef/0x170 kernel/events/core.c:92
 csd_do_func kernel/smp.c:134 [inline]
 generic_exec_single+0x336/0x9b0 kernel/smp.c:433
 smp_call_function_single+0x3fa/0x1990 kernel/smp.c:676
 task_function_call kernel/events/core.c:120 [inline]
 perf_install_in_context+0x71a/0xb20 kernel/events/core.c:2985
 __do_sys_perf_event_open kernel/events/core.c:13006 [inline]
 __se_sys_perf_event_open+0x31c5/0x38d0 kernel/events/core.c:12658
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe33e17def9
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:00007fe33ef63038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007fe33e335f80 RCX: 00007fe33e17def9
RDX: bfffffffffffffff RSI: 0000000000000000 RDI: 0000000020000180
RBP: 00007fe33ef63090 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007fe33e335f80 R15: 00007ffc48ab6e58
 </TASK>
CPU: 1 UID: 0 PID: 7708 Comm: syz.0.575 Not tainted 6.11.0-syzkaller-g88264981f208 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 fail_dump lib/fault-inject.c:53 [inline]
 should_fail_ex+0x3b0/0x4e0 lib/fault-inject.c:154
 strncpy_from_user+0x36/0x2e0 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:186
 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:215 [inline]
 ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:224 [inline]
 bpf_probe_read_user_str+0x2a/0x70 kernel/trace/bpf_trace.c:221
 bpf_prog_99b56f93a3ca5fea+0x4b/0x4d
 bpf_dispatcher_nop_func include/linux/bpf.h:1257 [inline]
 __bpf_prog_run include/linux/filter.h:701 [inline]
 bpf_prog_run include/linux/filter.h:708 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2318 [inline]
 bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2359
 __traceiter_hrtimer_start+0x76/0xd0 include/trace/events/timer.h:222
 trace_hrtimer_start include/trace/events/timer.h:222 [inline]
 debug_activate kernel/time/hrtimer.c:479 [inline]
 enqueue_hrtimer+0x35a/0x3c0 kernel/time/hrtimer.c:1085
 __hrtimer_start_range_ns kernel/time/hrtimer.c:1260 [inline]
 hrtimer_start_range_ns+0xac8/0xca0 kernel/time/hrtimer.c:1302
 hrtimer_start include/linux/hrtimer.h:275 [inline]
 perf_swevent_start_hrtimer kernel/events/core.c:11254 [inline]
 cpu_clock_event_start kernel/events/core.c:11312 [inline]
 cpu_clock_event_add+0x180/0x1a0 kernel/events/core.c:11324
 event_sched_in+0x832/0xe90 kernel/events/core.c:2620
 group_sched_in kernel/events/core.c:2653 [inline]
 merge_sched_in kernel/events/core.c:3931 [inline]
 visit_groups_merge+0x1521/0x2fd0 kernel/events/core.c:3876
 pmu_groups_sched_in kernel/events/core.c:3958 [inline]
 __pmu_ctx_sched_in+0x1aa/0x230 kernel/events/core.c:3970
 ctx_sched_in+0x4c2/0x600 kernel/events/core.c:4021
 ctx_resched+0x560/0x900 kernel/events/core.c:2807
 __perf_install_in_context+0x647/0x850 kernel/events/core.c:2882
 remote_function+0xef/0x170 kernel/events/core.c:92
 csd_do_func kernel/smp.c:134 [inline]
 generic_exec_single+0x336/0x9b0 kernel/smp.c:433
 smp_call_function_single+0x3fa/0x1990 kernel/smp.c:676
 task_function_call kernel/events/core.c:120 [inline]
 perf_install_in_context+0x71a/0xb20 kernel/events/core.c:2985
 __do_sys_perf_event_open kernel/events/core.c:13006 [inline]
 __se_sys_perf_event_open+0x31c5/0x38d0 kernel/events/core.c:12658
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe33e17def9
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:00007fe33ef63038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007fe33e335f80 RCX: 00007fe33e17def9
RDX: bfffffffffffffff RSI: 0000000000000000 RDI: 0000000020000180
RBP: 00007fe33ef63090 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007fe33e335f80 R15: 00007ffc48ab6e58
 </TASK>