FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 1
======================================================
WARNING: possible circular locking dependency detected
6.11.0-syzkaller-11728-gad46e8f95e93 #0 Not tainted
------------------------------------------------------
syz.0.0/5110 is trying to acquire lock:
ffffffff8e813418 ((console_sem).lock){-...}-{2:2}, at: down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139

but task is already holding lock:
ffff88801fc3ea98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:593

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #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:1505 [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
       vga_remove_vgacon+0xbe/0xd0 drivers/pci/vgaarb.c:186
       virtio_gpu_pci_quirk drivers/gpu/drm/virtio/virtgpu_drv.c:61 [inline]
       virtio_gpu_probe+0x347/0x3c0 drivers/gpu/drm/virtio/virtgpu_drv.c:92
       virtio_dev_probe+0x931/0xc80 drivers/virtio/virtio.c:341
       really_probe+0x2b8/0xad0 drivers/base/dd.c:658
       __driver_probe_device+0x1a2/0x390 drivers/base/dd.c:800
       driver_probe_device+0x50/0x430 drivers/base/dd.c:830
       __driver_attach+0x45f/0x710 drivers/base/dd.c:1216
       bus_for_each_dev+0x239/0x2b0 drivers/base/bus.c:370
       bus_add_driver+0x346/0x670 drivers/base/bus.c:675
       driver_register+0x23a/0x320 drivers/base/driver.c:246
       do_one_initcall+0x248/0x880 init/main.c:1269
       do_initcall_level+0x157/0x210 init/main.c:1331
       do_initcalls+0x3f/0x80 init/main.c:1347
       kernel_init_freeable+0x435/0x5d0 init/main.c:1580
       kernel_init+0x1d/0x2b0 init/main.c:1469
       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+0x36/0x250 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_b1bc9f7c1f89903c+0x41/0x43
       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_run4+0x334/0x590 kernel/trace/bpf_trace.c:2361
       trace_sched_switch include/trace/events/sched.h:222 [inline]
       __schedule+0x234a/0x4b30 kernel/sched/core.c:6672
       preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6854
       preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6878
       preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
       __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
       _raw_spin_unlock_irqrestore+0x130/0x140 kernel/locking/spinlock.c:194
       kthread_queue_work+0x110/0x180 kernel/kthread.c:1033
       synchronize_rcu_expedited_queue_work kernel/rcu/tree_exp.h:489 [inline]
       synchronize_rcu_expedited+0x5ad/0x830 kernel/rcu/tree_exp.h:986
       dev_deactivate_many+0x4a7/0xb10 net/sched/sch_generic.c:1371
       __dev_close_many+0x1a4/0x300 net/core/dev.c:1547
       __dev_close net/core/dev.c:1572 [inline]
       __dev_change_flags+0x30e/0x6f0 net/core/dev.c:8835
       dev_change_flags+0x8b/0x1a0 net/core/dev.c:8909
       dev_ifsioc+0x7c8/0xe70 net/core/dev_ioctl.c:526
       dev_ioctl+0x719/0x1340 net/core/dev_ioctl.c:783
       sock_do_ioctl+0x240/0x460 net/socket.c:1241
       sock_ioctl+0x626/0x8e0 net/socket.c:1346
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:907 [inline]
       __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
       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 --> &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 ***

4 locks held by syz.0.0/5110:
 #0: ffffffff8fcd1408 (rtnl_mutex){+.+.}-{3:3}, at: dev_ioctl+0x706/0x1340 net/core/dev_ioctl.c:782
 #1: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline]
 #1: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:976
 #2: ffff88801fc3ea98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:593
 #3: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #3: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #3: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2317 [inline]
 #3: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x244/0x590 kernel/trace/bpf_trace.c:2361

stack backtrace:
CPU: 0 UID: 0 PID: 5110 Comm: syz.0.0 Not tainted 6.11.0-syzkaller-11728-gad46e8f95e93 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
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+0x36/0x250 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_b1bc9f7c1f89903c+0x41/0x43
 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_run4+0x334/0x590 kernel/trace/bpf_trace.c:2361
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x234a/0x4b30 kernel/sched/core.c:6672
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6854
 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6878
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0x130/0x140 kernel/locking/spinlock.c:194
 kthread_queue_work+0x110/0x180 kernel/kthread.c:1033
 synchronize_rcu_expedited_queue_work kernel/rcu/tree_exp.h:489 [inline]
 synchronize_rcu_expedited+0x5ad/0x830 kernel/rcu/tree_exp.h:986
 dev_deactivate_many+0x4a7/0xb10 net/sched/sch_generic.c:1371
 __dev_close_many+0x1a4/0x300 net/core/dev.c:1547
 __dev_close net/core/dev.c:1572 [inline]
 __dev_change_flags+0x30e/0x6f0 net/core/dev.c:8835
 dev_change_flags+0x8b/0x1a0 net/core/dev.c:8909
 dev_ifsioc+0x7c8/0xe70 net/core/dev_ioctl.c:526
 dev_ioctl+0x719/0x1340 net/core/dev_ioctl.c:783
 sock_do_ioctl+0x240/0x460 net/socket.c:1241
 sock_ioctl+0x626/0x8e0 net/socket.c:1346
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
 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: 0033:0x7fd650d7dff9
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:00007fd651abb038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd650f35f80 RCX: 00007fd650d7dff9
RDX: 00000000200000c0 RSI: 0000000000008914 RDI: 0000000000000008
RBP: 00007fd651abb090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007fd650f35f80 R15: 00007ffcd8e35ac8
 </TASK>
CPU: 0 UID: 0 PID: 5110 Comm: syz.0.0 Not tainted 6.11.0-syzkaller-11728-gad46e8f95e93 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
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+0x36/0x250 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_b1bc9f7c1f89903c+0x41/0x43
 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_run4+0x334/0x590 kernel/trace/bpf_trace.c:2361
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x234a/0x4b30 kernel/sched/core.c:6672
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6854
 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6878
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0x130/0x140 kernel/locking/spinlock.c:194
 kthread_queue_work+0x110/0x180 kernel/kthread.c:1033
 synchronize_rcu_expedited_queue_work kernel/rcu/tree_exp.h:489 [inline]
 synchronize_rcu_expedited+0x5ad/0x830 kernel/rcu/tree_exp.h:986
 dev_deactivate_many+0x4a7/0xb10 net/sched/sch_generic.c:1371
 __dev_close_many+0x1a4/0x300 net/core/dev.c:1547
 __dev_close net/core/dev.c:1572 [inline]
 __dev_change_flags+0x30e/0x6f0 net/core/dev.c:8835
 dev_change_flags+0x8b/0x1a0 net/core/dev.c:8909
 dev_ifsioc+0x7c8/0xe70 net/core/dev_ioctl.c:526
 dev_ioctl+0x719/0x1340 net/core/dev_ioctl.c:783
 sock_do_ioctl+0x240/0x460 net/socket.c:1241
 sock_ioctl+0x626/0x8e0 net/socket.c:1346
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
 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: 0033:0x7fd650d7dff9
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:00007fd651abb038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd650f35f80 RCX: 00007fd650d7dff9
RDX: 00000000200000c0 RSI: 0000000000008914 RDI: 0000000000000008
RBP: 00007fd651abb090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007fd650f35f80 R15: 00007ffcd8e35ac8
 </TASK>