------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.1.84-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.0/5556 is trying to acquire lock:
ffffffff8d006b38 ((console_sem).lock){..-.}-{2:2}, at: down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:139

but task is already holding lock:
ffff8880b993aa18 (&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:1354 [inline]
       rq_lock kernel/sched/sched.h:1644 [inline]
       task_fork_fair+0x5d/0x350 kernel/sched/fair.c:11869
       sched_cgroup_fork+0x374/0x400 kernel/sched/core.c:4686
       copy_process+0x2442/0x4060 kernel/fork.c:2384
       kernel_clone+0x222/0x920 kernel/fork.c:2682
       user_mode_thread+0x12e/0x190 kernel/fork.c:2758
       rest_init+0x23/0x300 init/main.c:697
       start_kernel+0x0/0x53f init/main.c:892
       start_kernel+0x496/0x53f init/main.c:1139
       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:4112
       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:4902
       dev_printk_emit+0xd9/0x118 drivers/base/core.c:4913
       __netdev_printk+0x335/0x410 net/core/dev.c:11257
       netdev_info+0x11e/0x165 net/core/dev.c:11312
       nsim_udp_tunnel_unset_port+0x2db/0x540 drivers/net/netdevsim/udp_tunnels.c:64
       udp_tunnel_nic_device_sync_by_port net/ipv4/udp_tunnel_nic.c:246 [inline]
       __udp_tunnel_nic_device_sync+0xa7e/0x13b0 net/ipv4/udp_tunnel_nic.c:289
       udp_tunnel_nic_flush+0x519/0xaa0 net/ipv4/udp_tunnel_nic.c:668
       udp_tunnel_nic_unregister net/ipv4/udp_tunnel_nic.c:869 [inline]
       udp_tunnel_nic_netdevice_event+0xa1a/0x1350 net/ipv4/udp_tunnel_nic.c:909
       notifier_call_chain kernel/notifier.c:87 [inline]
       raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:455
       call_netdevice_notifiers_info net/core/dev.c:1970 [inline]
       call_netdevice_notifiers_extack net/core/dev.c:2008 [inline]
       call_netdevice_notifiers net/core/dev.c:2022 [inline]
       unregister_netdevice_many+0xec1/0x17a0 net/core/dev.c:10881
       unregister_netdevice_queue+0x2e6/0x350 net/core/dev.c:10812
       unregister_netdevice include/linux/netdevice.h:3045 [inline]
       nsim_destroy+0x44/0x140 drivers/net/netdevsim/netdev.c:382
       __nsim_dev_port_del+0x153/0x1b0 drivers/net/netdevsim/dev.c:1430
       nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1442 [inline]
       nsim_dev_reload_destroy+0x286/0x490 drivers/net/netdevsim/dev.c:1659
       nsim_drv_remove+0x5c/0x160 drivers/net/netdevsim/dev.c:1675
       device_remove drivers/base/dd.c:548 [inline]
       __device_release_driver drivers/base/dd.c:1260 [inline]
       device_release_driver_internal+0x4f3/0x880 drivers/base/dd.c:1286
       bus_remove_device+0x2e5/0x400 drivers/base/bus.c:529
       device_del+0x6e2/0xbd0 drivers/base/core.c:3859
       device_unregister+0x1c/0xc0 drivers/base/core.c:3902
       nsim_bus_dev_del drivers/net/netdevsim/bus.c:310 [inline]
       del_device_store+0x35f/0x480 drivers/net/netdevsim/bus.c:219
       kernfs_fop_write_iter+0x3a2/0x4f0 fs/kernfs/file.c:330
       call_write_iter include/linux/fs.h:2265 [inline]
       new_sync_write fs/read_write.c:491 [inline]
       vfs_write+0x7ae/0xba0 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+0x3d/0xb0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #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
       __report_bug lib/bug.c:195 [inline]
       report_bug+0x342/0x500 lib/bug.c:219
       handle_bug+0x3d/0x70 arch/x86/kernel/traps.c:324
       exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:345
       asm_exc_invalid_op+0x16/0x20 arch/x86/include/asm/idtentry.h:568
       __local_bh_enable_ip+0x1b3/0x1f0
       sock_hash_delete_elem+0x1a0/0x2f0 net/core/sock_map.c:940
       bpf_prog_2c29ac5cdc6b1842+0x3a/0x3e
       bpf_dispatcher_nop_func include/linux/bpf.h:989 [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:2273 [inline]
       bpf_trace_run4+0x253/0x470 kernel/trace/bpf_trace.c:2314
       trace_sched_switch include/trace/events/sched.h:222 [inline]
       __schedule+0x2116/0x4550 kernel/sched/core.c:6555
       preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6727
       preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6751
       preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
       try_to_wake_up+0x87e/0x12e0 kernel/sched/core.c:4234
       wake_up_process kernel/sched/core.c:4362 [inline]
       wake_up_q+0x8b/0xd0 kernel/sched/core.c:1007
       futex_wake+0x4ea/0x590 kernel/futex/waitwake.c:184
       do_futex+0x375/0x490 kernel/futex/syscalls.c:111
       __do_sys_futex kernel/futex/syscalls.c:183 [inline]
       __se_sys_futex+0x3d7/0x460 kernel/futex/syscalls.c:164
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

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-executor.0/5556:
 #0: ffff8880b993aa18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537
 #1: ffffffff8d12a980 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #1: ffffffff8d12a980 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #1: ffffffff8d12a980 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2272 [inline]
 #1: ffffffff8d12a980 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x16a/0x470 kernel/trace/bpf_trace.c:2314

stack backtrace:
CPU: 1 PID: 5556 Comm: syz-executor.0 Not tainted 6.1.84-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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
 __report_bug lib/bug.c:195 [inline]
 report_bug+0x342/0x500 lib/bug.c:219
 handle_bug+0x3d/0x70 arch/x86/kernel/traps.c:324
 exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:345
 asm_exc_invalid_op+0x16/0x20 arch/x86/include/asm/idtentry.h:568
RIP: 0010:__local_bh_enable_ip+0x1b3/0x1f0 kernel/softirq.c:376
Code: 04 25 28 00 00 00 48 3b 44 24 60 75 4a 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 0b e9 d0 fe ff ff e8 3f 00 00 00 eb a2 <0f> 0b e9 02 ff ff ff 48 c7 c1 e4 9e 73 8e 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9001a08f5c0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 1ffff92003411ebc RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000201 RDI: ffffffff88981ad0
RBP: ffffc9001a08f680 R08: dffffc0000000000 R09: ffffed1012586902
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 0000000000000004 R14: ffffc9001a08f600 R15: 0000000000000201
 sock_hash_delete_elem+0x1a0/0x2f0 net/core/sock_map.c:940
 bpf_prog_2c29ac5cdc6b1842+0x3a/0x3e
 bpf_dispatcher_nop_func include/linux/bpf.h:989 [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:2273 [inline]
 bpf_trace_run4+0x253/0x470 kernel/trace/bpf_trace.c:2314
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x2116/0x4550 kernel/sched/core.c:6555
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6727
 preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6751
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 try_to_wake_up+0x87e/0x12e0 kernel/sched/core.c:4234
 wake_up_process kernel/sched/core.c:4362 [inline]
 wake_up_q+0x8b/0xd0 kernel/sched/core.c:1007
 futex_wake+0x4ea/0x590 kernel/futex/waitwake.c:184
 do_futex+0x375/0x490 kernel/futex/syscalls.c:111
 __do_sys_futex kernel/futex/syscalls.c:183 [inline]
 __se_sys_futex+0x3d7/0x460 kernel/futex/syscalls.c:164
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f1dfde7de69
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:00007f1dfec84178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f1dfdfabf88 RCX: 00007f1dfde7de69
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f1dfdfabf8c
RBP: 00007f1dfdfabf80 R08: 0000000000000010 R09: 00007f1dfec846c0
R10: 0000000000000005 R11: 0000000000000246 R12: 00007f1dfdfabf8c
R13: 000000000000000b R14: 00007ffcd4948550 R15: 00007ffcd4948638
 </TASK>
WARNING: CPU: 1 PID: 5556 at kernel/softirq.c:376 __local_bh_enable_ip+0x1b3/0x1f0
Modules linked in:
CPU: 1 PID: 5556 Comm: syz-executor.0 Not tainted 6.1.84-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:__local_bh_enable_ip+0x1b3/0x1f0 kernel/softirq.c:376
Code: 04 25 28 00 00 00 48 3b 44 24 60 75 4a 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 0b e9 d0 fe ff ff e8 3f 00 00 00 eb a2 <0f> 0b e9 02 ff ff ff 48 c7 c1 e4 9e 73 8e 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9001a08f5c0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 1ffff92003411ebc RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000201 RDI: ffffffff88981ad0
RBP: ffffc9001a08f680 R08: dffffc0000000000 R09: ffffed1012586902
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 0000000000000004 R14: ffffc9001a08f600 R15: 0000000000000201
FS:  00007f1dfec846c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33521000 CR3: 000000009ae62000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 sock_hash_delete_elem+0x1a0/0x2f0 net/core/sock_map.c:940
 bpf_prog_2c29ac5cdc6b1842+0x3a/0x3e
 bpf_dispatcher_nop_func include/linux/bpf.h:989 [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:2273 [inline]
 bpf_trace_run4+0x253/0x470 kernel/trace/bpf_trace.c:2314
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x2116/0x4550 kernel/sched/core.c:6555
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6727
 preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6751
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 try_to_wake_up+0x87e/0x12e0 kernel/sched/core.c:4234
 wake_up_process kernel/sched/core.c:4362 [inline]
 wake_up_q+0x8b/0xd0 kernel/sched/core.c:1007
 futex_wake+0x4ea/0x590 kernel/futex/waitwake.c:184
 do_futex+0x375/0x490 kernel/futex/syscalls.c:111
 __do_sys_futex kernel/futex/syscalls.c:183 [inline]
 __se_sys_futex+0x3d7/0x460 kernel/futex/syscalls.c:164
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f1dfde7de69
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:00007f1dfec84178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f1dfdfabf88 RCX: 00007f1dfde7de69
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f1dfdfabf8c
RBP: 00007f1dfdfabf80 R08: 0000000000000010 R09: 00007f1dfec846c0
R10: 0000000000000005 R11: 0000000000000246 R12: 00007f1dfdfabf8c
R13: 000000000000000b R14: 00007ffcd4948550 R15: 00007ffcd4948638
 </TASK>