FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
5.15.148-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.2/7384 is trying to acquire lock:
ffffffff8c7fba78 ((console_sem).lock){-.-.}-{2:2}, at: down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:138

but task is already holding lock:
ffff8880b9b39718 (&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:11480
       sched_cgroup_fork+0x2d3/0x330 kernel/sched/core.c:4466
       copy_process+0x224a/0x3ef0 kernel/fork.c:2320
       kernel_clone+0x210/0x960 kernel/fork.c:2604
       kernel_thread+0x168/0x1e0 kernel/fork.c:2656
       rest_init+0x21/0x330 init/main.c:703
       start_kernel+0x48c/0x535 init/main.c:1137
       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:4030
       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:2754
       vprintk_emit+0xbf/0x150 kernel/printk/printk.c:2268
       _printk+0xd1/0x111 kernel/printk/printk.c:2293
       mnt_warn_timestamp_expiry+0x313/0x350 fs/namespace.c:2577
       do_new_mount_fc fs/namespace.c:2940 [inline]
       do_new_mount+0x42b/0xb40 fs/namespace.c:3007
       do_mount fs/namespace.c:3348 [inline]
       __do_sys_mount fs/namespace.c:3556 [inline]
       __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3533
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x61/0xcb

-> #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:2569 [inline]
       console_trylock_spinning+0x8a/0x3f0 kernel/printk/printk.c:1867
       vprintk_emit+0xa6/0x150 kernel/printk/printk.c:2267
       _printk+0xd1/0x111 kernel/printk/printk.c:2293
       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_b0fe9b75aaebb688+0x38/0xd28
       bpf_dispatcher_nop_func include/linux/bpf.h:776 [inline]
       __bpf_prog_run include/linux/filter.h:625 [inline]
       bpf_prog_run include/linux/filter.h:632 [inline]
       __bpf_trace_run kernel/trace/bpf_trace.c:1883 [inline]
       bpf_trace_run3+0x1d1/0x380 kernel/trace/bpf_trace.c:1921
       trace_sched_switch include/trace/events/sched.h:220 [inline]
       __schedule+0x1e8d/0x45b0 kernel/sched/core.c:6373
       preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6780
       irqentry_exit+0x53/0x80 kernel/entry/common.c:426
       asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
       crng_make_state+0x530/0x690 drivers/char/random.c:393
       _get_random_bytes+0xd3/0x2b0 drivers/char/random.c:405
       wg_cookie_checker_init+0x68/0x90 drivers/net/wireguard/cookie.c:24
       wg_newlink+0xb4/0x740 drivers/net/wireguard/device.c:305
       __rtnl_newlink net/core/rtnetlink.c:3501 [inline]
       rtnl_newlink+0x14bd/0x2070 net/core/rtnetlink.c:3549
       rtnetlink_rcv_msg+0x993/0xee0 net/core/rtnetlink.c:5630
       netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2505
       netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
       netlink_unicast+0x7b6/0x980 net/netlink/af_netlink.c:1356
       netlink_sendmsg+0xa30/0xd60 net/netlink/af_netlink.c:1924
       sock_sendmsg_nosec net/socket.c:704 [inline]
       __sock_sendmsg net/socket.c:716 [inline]
       ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2431
       ___sys_sendmsg+0x252/0x2e0 net/socket.c:2485
       __sys_sendmsg net/socket.c:2514 [inline]
       __do_sys_sendmsg net/socket.c:2523 [inline]
       __se_sys_sendmsg+0x19a/0x260 net/socket.c:2521
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x61/0xcb

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-executor.2/7384:
 #0: ffffffff8d9da688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d9da688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x94c/0xee0 net/core/rtnetlink.c:5627
 #1: ffff8880b9b39718 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
 #2: ffffffff8c91f220 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:268

stack backtrace:
CPU: 1 PID: 7384 Comm: syz-executor.2 Not tainted 5.15.148-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb 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:2569 [inline]
 console_trylock_spinning+0x8a/0x3f0 kernel/printk/printk.c:1867
 vprintk_emit+0xa6/0x150 kernel/printk/printk.c:2267
 _printk+0xd1/0x111 kernel/printk/printk.c:2293
 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_b0fe9b75aaebb688+0x38/0xd28
 bpf_dispatcher_nop_func include/linux/bpf.h:776 [inline]
 __bpf_prog_run include/linux/filter.h:625 [inline]
 bpf_prog_run include/linux/filter.h:632 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:1883 [inline]
 bpf_trace_run3+0x1d1/0x380 kernel/trace/bpf_trace.c:1921
 trace_sched_switch include/trace/events/sched.h:220 [inline]
 __schedule+0x1e8d/0x45b0 kernel/sched/core.c:6373
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6780
 irqentry_exit+0x53/0x80 kernel/entry/common.c:426
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:crng_make_state+0x530/0x690 drivers/char/random.c:393
Code: db a9 05 e9 38 fd ff ff e8 ed 00 04 fd e8 c8 5b a0 05 4d 85 e4 0f 84 ff fe ff ff e8 da 00 04 fd fb 48 c7 44 24 40 0e 36 e0 45 <43> c7 44 3d 00 00 00 00 00 4b c7 44 3d 0c 00 00 00 00 66 43 c7 44
RSP: 0018:ffffc900032b6a00 EFLAGS: 00000283
RAX: ffffffff847c2ce6 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc90003b0d000 RSI: 00000000000003fa RDI: 00000000000003fb
RBP: ffffc900032b6b50 R08: ffffffff847c2bc9 R09: fffffbfff1f7a01a
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000200
R13: dffffc0000000000 R14: 0000000000000046 R15: 1ffff92000656d48
 _get_random_bytes+0xd3/0x2b0 drivers/char/random.c:405
 wg_cookie_checker_init+0x68/0x90 drivers/net/wireguard/cookie.c:24
 wg_newlink+0xb4/0x740 drivers/net/wireguard/device.c:305
 __rtnl_newlink net/core/rtnetlink.c:3501 [inline]
 rtnl_newlink+0x14bd/0x2070 net/core/rtnetlink.c:3549
 rtnetlink_rcv_msg+0x993/0xee0 net/core/rtnetlink.c:5630
 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2505
 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
 netlink_unicast+0x7b6/0x980 net/netlink/af_netlink.c:1356
 netlink_sendmsg+0xa30/0xd60 net/netlink/af_netlink.c:1924
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2431
 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2485
 __sys_sendmsg net/socket.c:2514 [inline]
 __do_sys_sendmsg net/socket.c:2523 [inline]
 __se_sys_sendmsg+0x19a/0x260 net/socket.c:2521
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fddf2c7ada9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fddf11fb0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fddf2da8f80 RCX: 00007fddf2c7ada9
RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000006
RBP: 00007fddf11fb120 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 000000000000000b R14: 00007fddf2da8f80 R15: 00007ffc87cd7d68
 </TASK>
CPU: 1 PID: 7384 Comm: syz-executor.2 Not tainted 5.15.148-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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+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_b0fe9b75aaebb688+0x38/0xd28
 bpf_dispatcher_nop_func include/linux/bpf.h:776 [inline]
 __bpf_prog_run include/linux/filter.h:625 [inline]
 bpf_prog_run include/linux/filter.h:632 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:1883 [inline]
 bpf_trace_run3+0x1d1/0x380 kernel/trace/bpf_trace.c:1921
 trace_sched_switch include/trace/events/sched.h:220 [inline]
 __schedule+0x1e8d/0x45b0 kernel/sched/core.c:6373
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6780
 irqentry_exit+0x53/0x80 kernel/entry/common.c:426
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:crng_make_state+0x530/0x690 drivers/char/random.c:393
Code: db a9 05 e9 38 fd ff ff e8 ed 00 04 fd e8 c8 5b a0 05 4d 85 e4 0f 84 ff fe ff ff e8 da 00 04 fd fb 48 c7 44 24 40 0e 36 e0 45 <43> c7 44 3d 00 00 00 00 00 4b c7 44 3d 0c 00 00 00 00 66 43 c7 44
RSP: 0018:ffffc900032b6a00 EFLAGS: 00000283
RAX: ffffffff847c2ce6 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc90003b0d000 RSI: 00000000000003fa RDI: 00000000000003fb
RBP: ffffc900032b6b50 R08: ffffffff847c2bc9 R09: fffffbfff1f7a01a
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000200
R13: dffffc0000000000 R14: 0000000000000046 R15: 1ffff92000656d48
 _get_random_bytes+0xd3/0x2b0 drivers/char/random.c:405
 wg_cookie_checker_init+0x68/0x90 drivers/net/wireguard/cookie.c:24
 wg_newlink+0xb4/0x740 drivers/net/wireguard/device.c:305
 __rtnl_newlink net/core/rtnetlink.c:3501 [inline]
 rtnl_newlink+0x14bd/0x2070 net/core/rtnetlink.c:3549
 rtnetlink_rcv_msg+0x993/0xee0 net/core/rtnetlink.c:5630
 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2505
 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
 netlink_unicast+0x7b6/0x980 net/netlink/af_netlink.c:1356
 netlink_sendmsg+0xa30/0xd60 net/netlink/af_netlink.c:1924
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2431
 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2485
 __sys_sendmsg net/socket.c:2514 [inline]
 __do_sys_sendmsg net/socket.c:2523 [inline]
 __se_sys_sendmsg+0x19a/0x260 net/socket.c:2521
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fddf2c7ada9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fddf11fb0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fddf2da8f80 RCX: 00007fddf2c7ada9
RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000006
RBP: 00007fddf11fb120 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 000000000000000b R14: 00007fddf2da8f80 R15: 00007ffc87cd7d68
 </TASK>
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	e9 38 fd ff ff       	jmp    0xfffffd3d
   5:	e8 ed 00 04 fd       	call   0xfd0400f7
   a:	e8 c8 5b a0 05       	call   0x5a05bd7
   f:	4d 85 e4             	test   %r12,%r12
  12:	0f 84 ff fe ff ff    	je     0xffffff17
  18:	e8 da 00 04 fd       	call   0xfd0400f7
  1d:	fb                   	sti
  1e:	48 c7 44 24 40 0e 36 	movq   $0x45e0360e,0x40(%rsp)
  25:	e0 45
* 27:	43 c7 44 3d 00 00 00 	movl   $0x0,0x0(%r13,%r15,1) <-- trapping instruction
  2e:	00 00
  30:	4b c7 44 3d 0c 00 00 	movq   $0x0,0xc(%r13,%r15,1)
  37:	00 00
  39:	66                   	data16
  3a:	43                   	rex.XB
  3b:	c7                   	.byte 0xc7
  3c:	44                   	rex.R