FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
5.15.178-syzkaller #0 Not tainted
------------------------------------------------------
syz.1.811/6673 is trying to acquire lock:
ffffffff8c9fc538 ((console_sem).lock){-...}-{2:2}, at: down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:138

but task is already holding lock:
ffff8880b8e3a318 (&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:11488
       sched_cgroup_fork+0x2d3/0x330 kernel/sched/core.c:4463
       copy_process+0x224a/0x3ef0 kernel/fork.c:2319
       kernel_clone+0x210/0x960 kernel/fork.c:2603
       kernel_thread+0x168/0x1e0 kernel/fork.c:2655
       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
       _printk+0xd1/0x120 kernel/printk/printk.c:2299
       check_stack_usage kernel/exit.c:766 [inline]
       do_exit+0x1a91/0x2480 kernel/exit.c:917
       call_usermodehelper_exec_async+0x368/0x370 kernel/umh.c:125
       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_compat_str kernel/trace/bpf_trace.c:300 [inline]
       bpf_probe_read_compat_str+0xe4/0x180 kernel/trace/bpf_trace.c:296
       bpf_prog_c1796171ffc7efef+0x35/0xd78
       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_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
       unwind_get_return_address+0x52/0x80 arch/x86/kernel/unwind_orc.c:323
       arch_stack_walk+0xf3/0x140 arch/x86/kernel/stacktrace.c:26
       stack_trace_save+0x113/0x1c0 kernel/stacktrace.c:122
       kasan_save_stack mm/kasan/common.c:38 [inline]
       kasan_set_track mm/kasan/common.c:46 [inline]
       set_alloc_info mm/kasan/common.c:434 [inline]
       ____kasan_kmalloc+0xba/0xf0 mm/kasan/common.c:513
       kasan_kmalloc include/linux/kasan.h:264 [inline]
       kmem_cache_alloc_node_trace+0x171/0x2e0 mm/slub.c:3275
       kmalloc_node include/linux/slab.h:609 [inline]
       kzalloc_node include/linux/slab.h:732 [inline]
       __get_vm_area_node+0x11f/0x2f0 mm/vmalloc.c:2416
       __vmalloc_node_range+0xe3/0x8c0 mm/vmalloc.c:3020
       __bpf_map_area_alloc kernel/bpf/syscall.c:326 [inline]
       bpf_map_area_alloc+0xe0/0xf0 kernel/bpf/syscall.c:333
       stack_map_alloc+0x2f8/0x540 kernel/bpf/stackmap.c:125
       find_and_alloc_map kernel/bpf/syscall.c:127 [inline]
       map_create+0x446/0x2070 kernel/bpf/syscall.c:877
       __sys_bpf+0x276/0x670 kernel/bpf/syscall.c:4638
       __do_sys_bpf kernel/bpf/syscall.c:4760 [inline]
       __se_sys_bpf kernel/bpf/syscall.c:4758 [inline]
       __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4758
       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 ***

2 locks held by syz.1.811/6673:
 #0: ffff8880b8e3a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
 #1: ffffffff8cb1fce0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311

stack backtrace:
CPU: 0 PID: 6673 Comm: syz.1.811 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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_compat_str kernel/trace/bpf_trace.c:300 [inline]
 bpf_probe_read_compat_str+0xe4/0x180 kernel/trace/bpf_trace.c:296
 bpf_prog_c1796171ffc7efef+0x35/0xd78
 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_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:unwind_get_return_address+0x52/0x80 arch/x86/kernel/unwind_orc.c:323
Code: 83 c3 48 49 89 df 49 c1 ef 03 43 80 3c 37 00 74 08 48 89 df e8 df c5 91 00 48 8b 3b e8 a7 20 1c 00 85 c0 74 14 43 80 3c 37 00 <74> 08 48 89 df e8 c4 c5 91 00 48 8b 03 eb 02 31 c0 5b 41 5e 41 5f
RSP: 0018:ffffc900030cf780 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffc900030cf7e8 RCX: 0000000080000000
RDX: dffffc0000000000 RSI: ffffc900030cfdb0 RDI: ffffffff818e8e56
RBP: ffffc900030cf830 R08: ffffc900030cfdb0 R09: ffffc900030cf7f0
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88802aabd940
R13: ffffffff816e19f0 R14: dffffc0000000000 R15: 1ffff92000619efd
 arch_stack_walk+0xf3/0x140 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x113/0x1c0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc+0xba/0xf0 mm/kasan/common.c:513
 kasan_kmalloc include/linux/kasan.h:264 [inline]
 kmem_cache_alloc_node_trace+0x171/0x2e0 mm/slub.c:3275
 kmalloc_node include/linux/slab.h:609 [inline]
 kzalloc_node include/linux/slab.h:732 [inline]
 __get_vm_area_node+0x11f/0x2f0 mm/vmalloc.c:2416
 __vmalloc_node_range+0xe3/0x8c0 mm/vmalloc.c:3020
 __bpf_map_area_alloc kernel/bpf/syscall.c:326 [inline]
 bpf_map_area_alloc+0xe0/0xf0 kernel/bpf/syscall.c:333
 stack_map_alloc+0x2f8/0x540 kernel/bpf/stackmap.c:125
 find_and_alloc_map kernel/bpf/syscall.c:127 [inline]
 map_create+0x446/0x2070 kernel/bpf/syscall.c:877
 __sys_bpf+0x276/0x670 kernel/bpf/syscall.c:4638
 __do_sys_bpf kernel/bpf/syscall.c:4760 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4758 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4758
 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: 0033:0x7fa0e6c61de9
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:00007fa0e4acb038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fa0e6e7afa0 RCX: 00007fa0e6c61de9
RDX: 0000000000000048 RSI: 0000200000000080 RDI: 0000000000000000
RBP: 00007fa0e4acb090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000001 R14: 00007fa0e6e7afa0 R15: 00007ffea72ee1d8
 </TASK>
CPU: 0 PID: 6673 Comm: syz.1.811 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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_compat_str kernel/trace/bpf_trace.c:300 [inline]
 bpf_probe_read_compat_str+0xe4/0x180 kernel/trace/bpf_trace.c:296
 bpf_prog_c1796171ffc7efef+0x35/0xd78
 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_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:unwind_get_return_address+0x52/0x80 arch/x86/kernel/unwind_orc.c:323
Code: 83 c3 48 49 89 df 49 c1 ef 03 43 80 3c 37 00 74 08 48 89 df e8 df c5 91 00 48 8b 3b e8 a7 20 1c 00 85 c0 74 14 43 80 3c 37 00 <74> 08 48 89 df e8 c4 c5 91 00 48 8b 03 eb 02 31 c0 5b 41 5e 41 5f
RSP: 0018:ffffc900030cf780 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffc900030cf7e8 RCX: 0000000080000000
RDX: dffffc0000000000 RSI: ffffc900030cfdb0 RDI: ffffffff818e8e56
RBP: ffffc900030cf830 R08: ffffc900030cfdb0 R09: ffffc900030cf7f0
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88802aabd940
R13: ffffffff816e19f0 R14: dffffc0000000000 R15: 1ffff92000619efd
 arch_stack_walk+0xf3/0x140 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x113/0x1c0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc+0xba/0xf0 mm/kasan/common.c:513
 kasan_kmalloc include/linux/kasan.h:264 [inline]
 kmem_cache_alloc_node_trace+0x171/0x2e0 mm/slub.c:3275
 kmalloc_node include/linux/slab.h:609 [inline]
 kzalloc_node include/linux/slab.h:732 [inline]
 __get_vm_area_node+0x11f/0x2f0 mm/vmalloc.c:2416
 __vmalloc_node_range+0xe3/0x8c0 mm/vmalloc.c:3020
 __bpf_map_area_alloc kernel/bpf/syscall.c:326 [inline]
 bpf_map_area_alloc+0xe0/0xf0 kernel/bpf/syscall.c:333
 stack_map_alloc+0x2f8/0x540 kernel/bpf/stackmap.c:125
 find_and_alloc_map kernel/bpf/syscall.c:127 [inline]
 map_create+0x446/0x2070 kernel/bpf/syscall.c:877
 __sys_bpf+0x276/0x670 kernel/bpf/syscall.c:4638
 __do_sys_bpf kernel/bpf/syscall.c:4760 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4758 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4758
 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: 0033:0x7fa0e6c61de9
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:00007fa0e4acb038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fa0e6e7afa0 RCX: 00007fa0e6c61de9
RDX: 0000000000000048 RSI: 0000200000000080 RDI: 0000000000000000
RBP: 00007fa0e4acb090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000001 R14: 00007fa0e6e7afa0 R15: 00007ffea72ee1d8
 </TASK>
----------------
Code disassembly (best guess):
   0:	83 c3 48             	add    $0x48,%ebx
   3:	49 89 df             	mov    %rbx,%r15
   6:	49 c1 ef 03          	shr    $0x3,%r15
   a:	43 80 3c 37 00       	cmpb   $0x0,(%r15,%r14,1)
   f:	74 08                	je     0x19
  11:	48 89 df             	mov    %rbx,%rdi
  14:	e8 df c5 91 00       	call   0x91c5f8
  19:	48 8b 3b             	mov    (%rbx),%rdi
  1c:	e8 a7 20 1c 00       	call   0x1c20c8
  21:	85 c0                	test   %eax,%eax
  23:	74 14                	je     0x39
  25:	43 80 3c 37 00       	cmpb   $0x0,(%r15,%r14,1)
* 2a:	74 08                	je     0x34 <-- trapping instruction
  2c:	48 89 df             	mov    %rbx,%rdi
  2f:	e8 c4 c5 91 00       	call   0x91c5f8
  34:	48 8b 03             	mov    (%rbx),%rax
  37:	eb 02                	jmp    0x3b
  39:	31 c0                	xor    %eax,%eax
  3b:	5b                   	pop    %rbx
  3c:	41 5e                	pop    %r14
  3e:	41 5f                	pop    %r15