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-rc1-next-20240729-syzkaller #0 Not tainted
------------------------------------------------------
syz.0.7744/10446 is trying to acquire lock:
ffffffff8e813318 ((console_sem).lock){-.-.}-{2:2}, at: down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139

but task is already holding lock:
ffff8880b923ea18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:568

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:568
       raw_spin_rq_lock kernel/sched/sched.h:1481 [inline]
       rq_lock kernel/sched/sched.h:1780 [inline]
       task_fork_fair+0x61/0x1e0 kernel/sched/fair.c:12701
       sched_cgroup_fork+0x386/0x420 kernel/sched/core.c:4676
       copy_process+0x2201/0x3d90 kernel/fork.c:2485
       kernel_clone+0x226/0x8f0 kernel/fork.c:2788
       user_mode_thread+0x132/0x1a0 kernel/fork.c:2866
       rest_init+0x23/0x300 init/main.c:712
       start_kernel+0x47a/0x500 init/main.c:1103
       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+0xb0/0x1470 kernel/sched/core.c:4082
       up+0x72/0x90 kernel/locking/semaphore.c:191
       __up_console_sem kernel/printk/printk.c:342 [inline]
       __console_unlock kernel/printk/printk.c:2848 [inline]
       console_unlock+0x22f/0x4d0 kernel/printk/printk.c:3175
       vprintk_emit+0x7a1/0x900 kernel/printk/printk.c:2423
       dev_vprintk_emit+0x2ae/0x330 drivers/base/core.c:4909
       dev_printk_emit+0xdd/0x120 drivers/base/core.c:4920
       _dev_notice+0x122/0x170 drivers/base/core.c:4977
       usb_parse_endpoint drivers/usb/core/config.c:423 [inline]
       usb_parse_interface drivers/usb/core/config.c:594 [inline]
       usb_parse_configuration drivers/usb/core/config.c:807 [inline]
       usb_get_configuration+0x2fbe/0x4dc0 drivers/usb/core/config.c:956
       usb_enumerate_device drivers/usb/core/hub.c:2483 [inline]
       usb_new_device+0x14a/0x19a0 drivers/usb/core/hub.c:2621
       hub_port_connect drivers/usb/core/hub.c:5521 [inline]
       hub_port_connect_change drivers/usb/core/hub.c:5661 [inline]
       port_event drivers/usb/core/hub.c:5821 [inline]
       hub_event+0x2d6d/0x5150 drivers/usb/core/hub.c:5903
       process_one_work kernel/workqueue.c:3231 [inline]
       process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
       worker_thread+0x86d/0xd40 kernel/workqueue.c:3390
       kthread+0x2f0/0x390 kernel/kthread.c:389
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
       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:325
       console_trylock kernel/printk/printk.c:2831 [inline]
       console_trylock_spinning kernel/printk/printk.c:1982 [inline]
       vprintk_emit+0x391/0x900 kernel/printk/printk.c:2422
       _printk+0xd5/0x120 kernel/printk/printk.c:2450
       fail_dump lib/fault-inject.c:45 [inline]
       should_fail_ex+0x391/0x4e0 lib/fault-inject.c:153
       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:216 [inline]
       ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:225 [inline]
       bpf_probe_read_user_str+0x2a/0x70 kernel/trace/bpf_trace.c:222
       bpf_prog_bc7c5c6b9645592f+0x3d/0x3f
       bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline]
       __bpf_prog_run include/linux/filter.h:691 [inline]
       bpf_prog_run include/linux/filter.h:698 [inline]
       __bpf_trace_run kernel/trace/bpf_trace.c:2406 [inline]
       bpf_trace_run4+0x334/0x590 kernel/trace/bpf_trace.c:2449
       __traceiter_sched_switch+0x98/0xd0 include/trace/events/sched.h:222
       trace_sched_switch include/trace/events/sched.h:222 [inline]
       __schedule+0x2591/0x4a60 kernel/sched/core.c:6600
       preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6925
       irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
       asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
       __slab_alloc_node mm/slub.c:3842 [inline]
       slab_alloc_node mm/slub.c:4025 [inline]
       kmem_cache_alloc_noprof+0x95/0x2a0 mm/slub.c:4044
       getname_flags+0xb7/0x540 fs/namei.c:139
       do_sys_openat2+0xd2/0x1d0 fs/open.c:1410
       do_sys_open fs/open.c:1431 [inline]
       __do_sys_creat fs/open.c:1507 [inline]
       __se_sys_creat fs/open.c:1501 [inline]
       __x64_sys_creat+0x123/0x170 fs/open.c:1501
       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 ***

2 locks held by syz.0.7744/10446:
 #0: ffff8880b923ea18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:568
 #1: ffffffff8e937a60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
 #1: ffffffff8e937a60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #1: ffffffff8e937a60 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2405 [inline]
 #1: ffffffff8e937a60 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x244/0x590 kernel/trace/bpf_trace.c:2449

stack backtrace:
CPU: 0 UID: 0 PID: 10446 Comm: syz.0.7744 Not tainted 6.11.0-rc1-next-20240729-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
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:325
 console_trylock kernel/printk/printk.c:2831 [inline]
 console_trylock_spinning kernel/printk/printk.c:1982 [inline]
 vprintk_emit+0x391/0x900 kernel/printk/printk.c:2422
 _printk+0xd5/0x120 kernel/printk/printk.c:2450
 fail_dump lib/fault-inject.c:45 [inline]
 should_fail_ex+0x391/0x4e0 lib/fault-inject.c:153
 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:216 [inline]
 ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:225 [inline]
 bpf_probe_read_user_str+0x2a/0x70 kernel/trace/bpf_trace.c:222
 bpf_prog_bc7c5c6b9645592f+0x3d/0x3f
 bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline]
 __bpf_prog_run include/linux/filter.h:691 [inline]
 bpf_prog_run include/linux/filter.h:698 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2406 [inline]
 bpf_trace_run4+0x334/0x590 kernel/trace/bpf_trace.c:2449
 __traceiter_sched_switch+0x98/0xd0 include/trace/events/sched.h:222
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x2591/0x4a60 kernel/sched/core.c:6600
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6925
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:__slab_alloc_node mm/slub.c:3861 [inline]
RIP: 0010:slab_alloc_node mm/slub.c:4025 [inline]
RIP: 0010:kmem_cache_alloc_noprof+0x95/0x2a0 mm/slub.c:4044
Code: 00 31 db 4d 85 ed 0f 84 f3 00 00 00 85 c0 0f 85 eb 00 00 00 0f 1f 44 00 00 65 48 8b 05 04 9c 12 7e 49 8b 4d 00 48 8b 54 08 08 <48> 8b 3c 08 48 85 ff 0f 84 09 01 00 00 48 83 7c 08 10 00 0f 84 fd
RSP: 0018:ffffc90004e0fcd0 EFLAGS: 00000246
RAX: ffff8880b9200000 RBX: 0000000000000000 RCX: 0000000000045640
RDX: 0000000000894fb0 RSI: 0000000000001000 RDI: ffffffff8ea4af60
RBP: 0000000000001000 R08: ffffffff9017d76f R09: 1ffffffff202faed
R10: dffffc0000000000 R11: fffffbfff202faee R12: dffffc0000000000
R13: ffff8880166fe780 R14: 0000000000000cc0 R15: ffffffff820ecdb7
 getname_flags+0xb7/0x540 fs/namei.c:139
 do_sys_openat2+0xd2/0x1d0 fs/open.c:1410
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_creat fs/open.c:1507 [inline]
 __se_sys_creat fs/open.c:1501 [inline]
 __x64_sys_creat+0x123/0x170 fs/open.c:1501
 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: 0033:0x7fcaf19779f9
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:00007fcaf26b0048 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007fcaf1b05f80 RCX: 00007fcaf19779f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000100
RBP: 00007fcaf26b00a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 000000000000000b R14: 00007fcaf1b05f80 R15: 00007ffc86a29218
 </TASK>
CPU: 0 UID: 0 PID: 10446 Comm: syz.0.7744 Not tainted 6.11.0-rc1-next-20240729-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
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:52 [inline]
 should_fail_ex+0x3b0/0x4e0 lib/fault-inject.c:153
 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:216 [inline]
 ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:225 [inline]
 bpf_probe_read_user_str+0x2a/0x70 kernel/trace/bpf_trace.c:222
 bpf_prog_bc7c5c6b9645592f+0x3d/0x3f
 bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline]
 __bpf_prog_run include/linux/filter.h:691 [inline]
 bpf_prog_run include/linux/filter.h:698 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2406 [inline]
 bpf_trace_run4+0x334/0x590 kernel/trace/bpf_trace.c:2449
 __traceiter_sched_switch+0x98/0xd0 include/trace/events/sched.h:222
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x2591/0x4a60 kernel/sched/core.c:6600
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6925
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:__slab_alloc_node mm/slub.c:3861 [inline]
RIP: 0010:slab_alloc_node mm/slub.c:4025 [inline]
RIP: 0010:kmem_cache_alloc_noprof+0x95/0x2a0 mm/slub.c:4044
Code: 00 31 db 4d 85 ed 0f 84 f3 00 00 00 85 c0 0f 85 eb 00 00 00 0f 1f 44 00 00 65 48 8b 05 04 9c 12 7e 49 8b 4d 00 48 8b 54 08 08 <48> 8b 3c 08 48 85 ff 0f 84 09 01 00 00 48 83 7c 08 10 00 0f 84 fd
RSP: 0018:ffffc90004e0fcd0 EFLAGS: 00000246
RAX: ffff8880b9200000 RBX: 0000000000000000 RCX: 0000000000045640
RDX: 0000000000894fb0 RSI: 0000000000001000 RDI: ffffffff8ea4af60
RBP: 0000000000001000 R08: ffffffff9017d76f R09: 1ffffffff202faed
R10: dffffc0000000000 R11: fffffbfff202faee R12: dffffc0000000000
R13: ffff8880166fe780 R14: 0000000000000cc0 R15: ffffffff820ecdb7
 getname_flags+0xb7/0x540 fs/namei.c:139
 do_sys_openat2+0xd2/0x1d0 fs/open.c:1410
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_creat fs/open.c:1507 [inline]
 __se_sys_creat fs/open.c:1501 [inline]
 __x64_sys_creat+0x123/0x170 fs/open.c:1501
 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: 0033:0x7fcaf19779f9
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:00007fcaf26b0048 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007fcaf1b05f80 RCX: 00007fcaf19779f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000100
RBP: 00007fcaf26b00a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 000000000000000b R14: 00007fcaf1b05f80 R15: 00007ffc86a29218
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 31                	add    %dh,(%rcx)
   2:	db 4d 85             	fisttpl -0x7b(%rbp)
   5:	ed                   	in     (%dx),%eax
   6:	0f 84 f3 00 00 00    	je     0xff
   c:	85 c0                	test   %eax,%eax
   e:	0f 85 eb 00 00 00    	jne    0xff
  14:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  19:	65 48 8b 05 04 9c 12 	mov    %gs:0x7e129c04(%rip),%rax        # 0x7e129c25
  20:	7e
  21:	49 8b 4d 00          	mov    0x0(%r13),%rcx
  25:	48 8b 54 08 08       	mov    0x8(%rax,%rcx,1),%rdx
* 2a:	48 8b 3c 08          	mov    (%rax,%rcx,1),%rdi <-- trapping instruction
  2e:	48 85 ff             	test   %rdi,%rdi
  31:	0f 84 09 01 00 00    	je     0x140
  37:	48 83 7c 08 10 00    	cmpq   $0x0,0x10(%rax,%rcx,1)
  3d:	0f                   	.byte 0xf
  3e:	84 fd                	test   %bh,%ch