FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
6.1.123-syzkaller #0 Not tainted
------------------------------------------------------
syz.4.778/7486 is trying to acquire lock:
ffffffff8d207278 ((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:11877
       sched_cgroup_fork+0x374/0x400 kernel/sched/core.c:4682
       copy_process+0x2442/0x4060 kernel/fork.c:2383
       kernel_clone+0x222/0x920 kernel/fork.c:2681
       user_mode_thread+0x12e/0x190 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/0x12e0 kernel/sched/core.c:4108
       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+0x2aa/0x323 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+0x8a9/0x11d0 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
       __copy_to_user_inatomic include/linux/uaccess.h:101 [inline]
       copy_to_user_nofault+0xd9/0x1c0 mm/maccess.c:149
       bpf_prog_6303d92f98284ad8+0x3b/0x3f
       bpf_dispatcher_nop_func include/linux/bpf.h:992 [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:6555
       preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6870
       irqentry_exit+0x53/0x80 kernel/entry/common.c:439
       asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
       fast_imageblit drivers/video/fbdev/core/sysimgblt.c:260 [inline]
       sys_imageblit+0x1b5f/0x2a10 drivers/video/fbdev/core/sysimgblt.c:323
       drm_fb_helper_sys_imageblit+0x2e/0x510 drivers/gpu/drm/drm_fb_helper.c:864
       bit_putcs+0x18b2/0x1da0
       fbcon_putcs+0x353/0x530 drivers/video/fbdev/core/fbcon.c:1284
       do_update_region+0x537/0x780 drivers/tty/vt/vt.c:676
       invert_screen+0x494/0xee0 drivers/tty/vt/vt.c:800
       set_mode+0x54f/0xa30 drivers/tty/vt/vt.c:1905
       do_con_write+0x461f/0x7270 drivers/tty/vt/vt.c:2951
       con_write+0x20/0x40 drivers/tty/vt/vt.c:3295
       process_output_block drivers/tty/n_tty.c:586 [inline]
       n_tty_write+0xd7f/0x1260 drivers/tty/n_tty.c:2377
       do_tty_write drivers/tty/tty_io.c:1018 [inline]
       file_tty_write+0x504/0x890 drivers/tty/tty_io.c:1089
       call_write_iter include/linux/fs.h:2265 [inline]
       new_sync_write fs/read_write.c:491 [inline]
       vfs_write+0x857/0xbc0 fs/read_write.c:584
       ksys_write+0x19c/0x2c0 fs/read_write.c:637
       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.4.778/7486:
 #0: ffff888075615098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffff888075615130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:944 [inline]
 #1: ffff888075615130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: do_tty_write drivers/tty/tty_io.c:967 [inline]
 #1: ffff888075615130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: file_tty_write+0x1f5/0x890 drivers/tty/tty_io.c:1089
 #2: ffff8880756152e8 (&tty->termios_rwsem){++++}-{3:3}, at: n_tty_write+0x25e/0x1260 drivers/tty/n_tty.c:2360
 #3: ffffc9000488b380 (&ldata->output_lock){+.+.}-{3:3}, at: process_output_block drivers/tty/n_tty.c:541 [inline]
 #3: ffffc9000488b380 (&ldata->output_lock){+.+.}-{3:3}, at: n_tty_write+0x6c8/0x1260 drivers/tty/n_tty.c:2377
 #4: ffffffff8d2072e0 (console_lock){+.+.}-{0:0}, at: do_con_write+0x110/0x7270 drivers/tty/vt/vt.c:2908
 #5: ffff8880b8f3a9d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537
 #6: ffffffff8d32b0c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #6: ffffffff8d32b0c0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #6: ffffffff8d32b0c0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2283 [inline]
 #6: ffffffff8d32b0c0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x16a/0x470 kernel/trace/bpf_trace.c:2325

stack backtrace:
CPU: 1 PID: 7486 Comm: syz.4.778 Not tainted 6.1.123-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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
 __copy_to_user_inatomic include/linux/uaccess.h:101 [inline]
 copy_to_user_nofault+0xd9/0x1c0 mm/maccess.c:149
 bpf_prog_6303d92f98284ad8+0x3b/0x3f
 bpf_dispatcher_nop_func include/linux/bpf.h:992 [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:6555
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6870
 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:fast_imageblit drivers/video/fbdev/core/sysimgblt.c:260 [inline]
RIP: 0010:sys_imageblit+0x1b5f/0x2a10 drivers/video/fbdev/core/sysimgblt.c:323
Code: 04 08 84 c0 0f 85 58 04 00 00 42 89 5c 3a 08 41 0f b6 44 0d 00 84 c0 0f 85 7c 04 00 00 41 0f b6 40 ff 48 c1 e8 04 23 44 24 20 <48> 8d b4 24 c0 00 00 00 48 8d 1c 86 48 89 d8 48 c1 e8 03 0f b6 04
RSP: 0018:ffffc9000496ee80 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000aaaaaa RCX: dffffc0000000000
RDX: ffffc900045b8000 RSI: ffffc9000496ef40 RDI: ffffc900045b8fe8
RBP: ffffc9000496f000 R08: ffff888024e79000 R09: ffffffff8489ffbb
R10: 0000000000000003 R11: ffff888031399dc0 R12: 0000000000000008
R13: 1ffff110049cf1ff R14: ffff888024e78fff R15: 0000000000000fe0
 drm_fb_helper_sys_imageblit+0x2e/0x510 drivers/gpu/drm/drm_fb_helper.c:864
 bit_putcs+0x18b2/0x1da0
 fbcon_putcs+0x353/0x530 drivers/video/fbdev/core/fbcon.c:1284
 do_update_region+0x537/0x780 drivers/tty/vt/vt.c:676
 invert_screen+0x494/0xee0 drivers/tty/vt/vt.c:800
 set_mode+0x54f/0xa30 drivers/tty/vt/vt.c:1905
 do_con_write+0x461f/0x7270 drivers/tty/vt/vt.c:2951
 con_write+0x20/0x40 drivers/tty/vt/vt.c:3295
 process_output_block drivers/tty/n_tty.c:586 [inline]
 n_tty_write+0xd7f/0x1260 drivers/tty/n_tty.c:2377
 do_tty_write drivers/tty/tty_io.c:1018 [inline]
 file_tty_write+0x504/0x890 drivers/tty/tty_io.c:1089
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x857/0xbc0 fs/read_write.c:584
 ksys_write+0x19c/0x2c0 fs/read_write.c:637
 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: 0033:0x7f0015b85d29
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:00007f0016a1d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f0015d75fa0 RCX: 00007f0015b85d29
RDX: 0000000000001006 RSI: 0000000020002080 RDI: 0000000000000004
RBP: 00007f0016a1d090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f0015d75fa0 R15: 00007ffe49c3e018
 </TASK>
CPU: 1 PID: 7486 Comm: syz.4.778 Not tainted 6.1.123-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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
 __copy_to_user_inatomic include/linux/uaccess.h:101 [inline]
 copy_to_user_nofault+0xd9/0x1c0 mm/maccess.c:149
 bpf_prog_6303d92f98284ad8+0x3b/0x3f
 bpf_dispatcher_nop_func include/linux/bpf.h:992 [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:6555
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6870
 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:fast_imageblit drivers/video/fbdev/core/sysimgblt.c:260 [inline]
RIP: 0010:sys_imageblit+0x1b5f/0x2a10 drivers/video/fbdev/core/sysimgblt.c:323
Code: 04 08 84 c0 0f 85 58 04 00 00 42 89 5c 3a 08 41 0f b6 44 0d 00 84 c0 0f 85 7c 04 00 00 41 0f b6 40 ff 48 c1 e8 04 23 44 24 20 <48> 8d b4 24 c0 00 00 00 48 8d 1c 86 48 89 d8 48 c1 e8 03 0f b6 04
RSP: 0018:ffffc9000496ee80 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000aaaaaa RCX: dffffc0000000000
RDX: ffffc900045b8000 RSI: ffffc9000496ef40 RDI: ffffc900045b8fe8
RBP: ffffc9000496f000 R08: ffff888024e79000 R09: ffffffff8489ffbb
R10: 0000000000000003 R11: ffff888031399dc0 R12: 0000000000000008
R13: 1ffff110049cf1ff R14: ffff888024e78fff R15: 0000000000000fe0
 drm_fb_helper_sys_imageblit+0x2e/0x510 drivers/gpu/drm/drm_fb_helper.c:864
 bit_putcs+0x18b2/0x1da0
 fbcon_putcs+0x353/0x530 drivers/video/fbdev/core/fbcon.c:1284
 do_update_region+0x537/0x780 drivers/tty/vt/vt.c:676
 invert_screen+0x494/0xee0 drivers/tty/vt/vt.c:800
 set_mode+0x54f/0xa30 drivers/tty/vt/vt.c:1905
 do_con_write+0x461f/0x7270 drivers/tty/vt/vt.c:2951
 con_write+0x20/0x40 drivers/tty/vt/vt.c:3295
 process_output_block drivers/tty/n_tty.c:586 [inline]
 n_tty_write+0xd7f/0x1260 drivers/tty/n_tty.c:2377
 do_tty_write drivers/tty/tty_io.c:1018 [inline]
 file_tty_write+0x504/0x890 drivers/tty/tty_io.c:1089
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x857/0xbc0 fs/read_write.c:584
 ksys_write+0x19c/0x2c0 fs/read_write.c:637
 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: 0033:0x7f0015b85d29
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:00007f0016a1d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f0015d75fa0 RCX: 00007f0015b85d29
RDX: 0000000000001006 RSI: 0000000020002080 RDI: 0000000000000004
RBP: 00007f0016a1d090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f0015d75fa0 R15: 00007ffe49c3e018
 </TASK>
----------------
Code disassembly (best guess):
   0:	04 08                	add    $0x8,%al
   2:	84 c0                	test   %al,%al
   4:	0f 85 58 04 00 00    	jne    0x462
   a:	42 89 5c 3a 08       	mov    %ebx,0x8(%rdx,%r15,1)
   f:	41 0f b6 44 0d 00    	movzbl 0x0(%r13,%rcx,1),%eax
  15:	84 c0                	test   %al,%al
  17:	0f 85 7c 04 00 00    	jne    0x499
  1d:	41 0f b6 40 ff       	movzbl -0x1(%r8),%eax
  22:	48 c1 e8 04          	shr    $0x4,%rax
  26:	23 44 24 20          	and    0x20(%rsp),%eax
* 2a:	48 8d b4 24 c0 00 00 	lea    0xc0(%rsp),%rsi <-- trapping instruction
  31:	00
  32:	48 8d 1c 86          	lea    (%rsi,%rax,4),%rbx
  36:	48 89 d8             	mov    %rbx,%rax
  39:	48 c1 e8 03          	shr    $0x3,%rax
  3d:	0f                   	.byte 0xf
  3e:	b6 04                	mov    $0x4,%dh