FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
5.15.171-syzkaller #0 Not tainted
------------------------------------------------------
syz.1.347/5751 is trying to acquire lock:
ffffffff8c7fc4b8 ((console_sem).lock){-...}-{2:2}, at: down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:138

but task is already holding lock:
ffff8880b903a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&rq->__lock){-.-.}-{2:2}:
       lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
       _raw_spin_lock_nested+0x2d/0x40 kernel/locking/spinlock.c:368
       raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
       raw_spin_rq_lock kernel/sched/sched.h:1326 [inline]
       rq_lock kernel/sched/sched.h:1621 [inline]
       task_fork_fair+0x5d/0x350 kernel/sched/fair.c:11484
       sched_cgroup_fork+0x2d3/0x330 kernel/sched/core.c:4463
       copy_process+0x224a/0x3ef0 kernel/fork.c:2317
       kernel_clone+0x210/0x960 kernel/fork.c:2601
       kernel_thread+0x168/0x1e0 kernel/fork.c:2653
       rest_init+0x21/0x330 init/main.c:706
       start_kernel+0x48c/0x540 init/main.c:1140
       secondary_startup_64_no_verify+0xb1/0xbb

-> #1 (&p->pi_lock){-.-.}-{2:2}:
       lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
       __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+0xae/0x1300 kernel/sched/core.c:4027
       up+0x6e/0x90 kernel/locking/semaphore.c:190
       __up_console_sem+0x11a/0x1e0 kernel/printk/printk.c:256
       console_unlock+0x1145/0x12b0 kernel/printk/printk.c:2760
       vprintk_emit+0xbf/0x150 kernel/printk/printk.c:2274
       dev_vprintk_emit+0x2aa/0x330 drivers/base/core.c:4618
       dev_printk_emit+0xd9/0x120 drivers/base/core.c:4629
       _dev_warn+0x11e/0x170 drivers/base/core.c:4685
       usb_choose_configuration+0x7c4/0x8a0 drivers/usb/core/generic.c:190
       usb_generic_driver_probe+0x68/0x140 drivers/usb/core/generic.c:236
       usb_probe_device+0x130/0x260 drivers/usb/core/driver.c:293
       really_probe+0x24e/0xb60 drivers/base/dd.c:595
       __driver_probe_device+0x1a2/0x3d0 drivers/base/dd.c:755
       driver_probe_device+0x50/0x420 drivers/base/dd.c:785
       __device_attach_driver+0x2b9/0x500 drivers/base/dd.c:907
       bus_for_each_drv+0x183/0x200 drivers/base/bus.c:429
       __device_attach+0x359/0x570 drivers/base/dd.c:979
       bus_probe_device+0xba/0x1e0 drivers/base/bus.c:489
       device_add+0xb48/0xfd0 drivers/base/core.c:3412
       usb_new_device+0xc17/0x18e0 drivers/usb/core/hub.c:2593
       hub_port_connect drivers/usb/core/hub.c:5455 [inline]
       hub_port_connect_change drivers/usb/core/hub.c:5595 [inline]
       port_event drivers/usb/core/hub.c:5741 [inline]
       hub_event+0x2cdf/0x54c0 drivers/usb/core/hub.c:5823
       process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
       worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
       kthread+0x3f6/0x4f0 kernel/kthread.c:334
       ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

-> #0 ((console_sem).lock){-...}-{2:2}:
       check_prev_add kernel/locking/lockdep.c:3053 [inline]
       check_prevs_add kernel/locking/lockdep.c:3172 [inline]
       validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788
       __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
       lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
       __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:138
       __down_trylock_console_sem+0x105/0x250 kernel/printk/printk.c:239
       console_trylock kernel/printk/printk.c:2575 [inline]
       console_trylock_spinning+0x8a/0x3f0 kernel/printk/printk.c:1867
       vprintk_emit+0xa6/0x150 kernel/printk/printk.c:2273
       _printk+0xd1/0x120 kernel/printk/printk.c:2299
       fail_dump lib/fault-inject.c:45 [inline]
       should_fail+0x36c/0x4c0 lib/fault-inject.c:146
       strncpy_from_user+0x32/0x370 lib/strncpy_from_user.c:118
       strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:295
       bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:194 [inline]
       ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:203 [inline]
       bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:200
       bpf_prog_bc7c5c6b9645592f+0x35/0xac
       bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline]
       __bpf_prog_run include/linux/filter.h:628 [inline]
       bpf_prog_run include/linux/filter.h:635 [inline]
       __bpf_trace_run kernel/trace/bpf_trace.c:1878 [inline]
       bpf_trace_run3+0x1d1/0x380 kernel/trace/bpf_trace.c:1916
       __traceiter_sched_switch+0x7d/0xb0 include/trace/events/sched.h:220
       trace_sched_switch include/trace/events/sched.h:220 [inline]
       __schedule+0x1e8d/0x45b0 kernel/sched/core.c:6370
       preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6777
       irqentry_exit+0x53/0x80 kernel/entry/common.c:432
       asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:681
       ksys_write+0x1a2/0x2c0 fs/read_write.c:647
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x66/0xd0

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 ***

3 locks held by syz.1.347/5751:
 #0: ffff8880737c99f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2cb/0x380 fs/file.c:1057
 #1: ffff8880b903a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
 #2: ffffffff8c91fc60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311

stack backtrace:
CPU: 0 PID: 5751 Comm: syz.1.347 Not tainted 5.15.171-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+0x1e3/0x2d0 lib/dump_stack.c:106
 check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133
 check_prev_add kernel/locking/lockdep.c:3053 [inline]
 check_prevs_add kernel/locking/lockdep.c:3172 [inline]
 validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788
 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
 __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:138
 __down_trylock_console_sem+0x105/0x250 kernel/printk/printk.c:239
 console_trylock kernel/printk/printk.c:2575 [inline]
 console_trylock_spinning+0x8a/0x3f0 kernel/printk/printk.c:1867
 vprintk_emit+0xa6/0x150 kernel/printk/printk.c:2273
 _printk+0xd1/0x120 kernel/printk/printk.c:2299
 fail_dump lib/fault-inject.c:45 [inline]
 should_fail+0x36c/0x4c0 lib/fault-inject.c:146
 strncpy_from_user+0x32/0x370 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:295
 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:194 [inline]
 ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:203 [inline]
 bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:200
 bpf_prog_bc7c5c6b9645592f+0x35/0xac
 bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline]
 __bpf_prog_run include/linux/filter.h:628 [inline]
 bpf_prog_run include/linux/filter.h:635 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:1878 [inline]
 bpf_trace_run3+0x1d1/0x380 kernel/trace/bpf_trace.c:1916
 __traceiter_sched_switch+0x7d/0xb0 include/trace/events/sched.h:220
 trace_sched_switch include/trace/events/sched.h:220 [inline]
 __schedule+0x1e8d/0x45b0 kernel/sched/core.c:6370
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6777
 irqentry_exit+0x53/0x80 kernel/entry/common.c:432
 asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:681
RIP: 0010:ksys_write+0x1a2/0x2c0 fs/read_write.c:647
Code: 00 00 00 e8 90 2b ab ff 45 31 ed 48 bb 00 00 00 00 00 fc ff df 4c 89 e7 48 8b 74 24 30 48 8b 54 24 38 4c 89 e9 e8 4e ec ff ff <49> 89 c4 31 ff 48 89 c6 e8 41 2f ab ff 4d 85 ed 74 57 4d 85 e4 78
RSP: 0018:ffffc9000132fe40 EFLAGS: 00000246
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: ffff888025e61dc0
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000132ff20 R08: ffffffff81d5338e R09: fffffbfff1bd2cd6
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880737c9900
R13: ffffc9000132fea0 R14: ffff8880737c9903 R15: ffff8880737c9a18
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f4780d1a1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 c9 8d 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 1c 8e 02 00 48
RSP: 002b:00007f477f151030 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 00007f4780d1a1ff
RDX: 0000000000000001 RSI: 00007f477f151090 RDI: 0000000000000009
RBP: 00007f477f151090 R08: 0000000000000000 R09: 00007f477f150df7
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f4780ed3130 R15: 00007ffc4051cab8
 </TASK>
CPU: 0 PID: 5751 Comm: syz.1.347 Not tainted 5.15.171-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+0x1e3/0x2d0 lib/dump_stack.c:106
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail+0x38a/0x4c0 lib/fault-inject.c:146
 strncpy_from_user+0x32/0x370 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:295
 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:194 [inline]
 ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:203 [inline]
 bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:200
 bpf_prog_bc7c5c6b9645592f+0x35/0xac
 bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline]
 __bpf_prog_run include/linux/filter.h:628 [inline]
 bpf_prog_run include/linux/filter.h:635 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:1878 [inline]
 bpf_trace_run3+0x1d1/0x380 kernel/trace/bpf_trace.c:1916
 __traceiter_sched_switch+0x7d/0xb0 include/trace/events/sched.h:220
 trace_sched_switch include/trace/events/sched.h:220 [inline]
 __schedule+0x1e8d/0x45b0 kernel/sched/core.c:6370
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6777
 irqentry_exit+0x53/0x80 kernel/entry/common.c:432
 asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:681
RIP: 0010:ksys_write+0x1a2/0x2c0 fs/read_write.c:647
Code: 00 00 00 e8 90 2b ab ff 45 31 ed 48 bb 00 00 00 00 00 fc ff df 4c 89 e7 48 8b 74 24 30 48 8b 54 24 38 4c 89 e9 e8 4e ec ff ff <49> 89 c4 31 ff 48 89 c6 e8 41 2f ab ff 4d 85 ed 74 57 4d 85 e4 78
RSP: 0018:ffffc9000132fe40 EFLAGS: 00000246
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: ffff888025e61dc0
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000132ff20 R08: ffffffff81d5338e R09: fffffbfff1bd2cd6
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880737c9900
R13: ffffc9000132fea0 R14: ffff8880737c9903 R15: ffff8880737c9a18
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f4780d1a1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 c9 8d 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 1c 8e 02 00 48
RSP: 002b:00007f477f151030 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 00007f4780d1a1ff
RDX: 0000000000000001 RSI: 00007f477f151090 RDI: 0000000000000009
RBP: 00007f477f151090 R08: 0000000000000000 R09: 00007f477f150df7
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f4780ed3130 R15: 00007ffc4051cab8
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 e8                	add    %ch,%al
   4:	90                   	nop
   5:	2b ab ff 45 31 ed    	sub    -0x12ceba01(%rbx),%ebp
   b:	48 bb 00 00 00 00 00 	movabs $0xdffffc0000000000,%rbx
  12:	fc ff df
  15:	4c 89 e7             	mov    %r12,%rdi
  18:	48 8b 74 24 30       	mov    0x30(%rsp),%rsi
  1d:	48 8b 54 24 38       	mov    0x38(%rsp),%rdx
  22:	4c 89 e9             	mov    %r13,%rcx
  25:	e8 4e ec ff ff       	call   0xffffec78
* 2a:	49 89 c4             	mov    %rax,%r12 <-- trapping instruction
  2d:	31 ff                	xor    %edi,%edi
  2f:	48 89 c6             	mov    %rax,%rsi
  32:	e8 41 2f ab ff       	call   0xffab2f78
  37:	4d 85 ed             	test   %r13,%r13
  3a:	74 57                	je     0x93
  3c:	4d 85 e4             	test   %r12,%r12
  3f:	78                   	.byte 0x78