------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted
------------------------------------------------------
syz-executor.3/7360 is trying to acquire lock:
ffffffff8d7a2838 ((console_sem).lock){-.-.}-{2:2}, at: down_trylock+0x12/0x70 kernel/locking/semaphore.c:139

but task is already holding lock:
ffff8880b953e6d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:559

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&rq->__lock){-.-.}-{2:2}:
       _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
       raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:559
       raw_spin_rq_lock kernel/sched/sched.h:1385 [inline]
       rq_lock kernel/sched/sched.h:1699 [inline]
       task_fork_fair+0x70/0x240 kernel/sched/fair.c:12629
       sched_cgroup_fork+0x3d2/0x510 kernel/sched/core.c:4845
       copy_process+0x4106/0x9160 kernel/fork.c:2498
       kernel_clone+0xfd/0x940 kernel/fork.c:2796
       user_mode_thread+0xb4/0xf0 kernel/fork.c:2874
       rest_init+0x27/0x2b0 init/main.c:695
       arch_call_rest_init+0x13/0x40 init/main.c:831
       start_kernel+0x3a3/0x490 init/main.c:1077
       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:509
       x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:490
       common_startup_64+0x13e/0x148

-> #1 (&p->pi_lock){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
       class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:553 [inline]
       try_to_wake_up+0x9a/0x13e0 kernel/sched/core.c:4262
       up+0x79/0xb0 kernel/locking/semaphore.c:191
       __up_console_sem kernel/printk/printk.c:340 [inline]
       __console_unlock kernel/printk/printk.c:2725 [inline]
       console_unlock+0x23e/0x290 kernel/printk/printk.c:3044
       vprintk_emit kernel/printk/printk.c:2342 [inline]
       vprintk_emit+0x11a/0x5a0 kernel/printk/printk.c:2297
       vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
       _printk+0xc8/0x100 kernel/printk/printk.c:2367
       batadv_hardif_enable_interface+0x778/0xd30 net/batman-adv/hard-interface.c:771
       batadv_softif_slave_add+0xf6/0x140 net/batman-adv/soft-interface.c:844
       do_set_master+0x1bf/0x230 net/core/rtnetlink.c:2685
       do_setlink+0xca8/0x3fe0 net/core/rtnetlink.c:2891
       __rtnl_newlink+0xc35/0x1960 net/core/rtnetlink.c:3680
       rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3727
       rtnetlink_rcv_msg+0x3ca/0xe60 net/core/rtnetlink.c:6595
       netlink_rcv_skb+0x16e/0x440 net/netlink/af_netlink.c:2559
       netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
       netlink_unicast+0x545/0x820 net/netlink/af_netlink.c:1361
       netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1905
       sock_sendmsg_nosec net/socket.c:730 [inline]
       __sock_sendmsg net/socket.c:745 [inline]
       __sys_sendto+0x482/0x4e0 net/socket.c:2191
       __do_sys_sendto net/socket.c:2203 [inline]
       __se_sys_sendto net/socket.c:2199 [inline]
       __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2199
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xd5/0x260 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x6d/0x75

-> #0 ((console_sem).lock){-.-.}-{2:2}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
       lock_acquire kernel/locking/lockdep.c:5754 [inline]
       lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
       down_trylock+0x12/0x70 kernel/locking/semaphore.c:139
       __down_trylock_console_sem+0x40/0x140 kernel/printk/printk.c:323
       console_trylock kernel/printk/printk.c:2678 [inline]
       console_trylock_spinning kernel/printk/printk.c:1958 [inline]
       vprintk_emit kernel/printk/printk.c:2341 [inline]
       vprintk_emit+0xe4/0x5a0 kernel/printk/printk.c:2297
       vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
       _printk+0xc8/0x100 kernel/printk/printk.c:2367
       __report_bug lib/bug.c:195 [inline]
       report_bug+0x4ac/0x580 lib/bug.c:219
       handle_bug+0x3d/0x70 arch/x86/kernel/traps.c:239
       exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:260
       asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
       __local_bh_enable_ip+0xc3/0x120 kernel/softirq.c:362
       spin_unlock_bh include/linux/spinlock.h:396 [inline]
       __sock_map_delete net/core/sock_map.c:424 [inline]
       sock_map_delete_elem+0xfd/0x150 net/core/sock_map.c:446
       bpf_prog_2c29ac5cdc6b1842+0x42/0x4a
       bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
       __bpf_prog_run include/linux/filter.h:657 [inline]
       bpf_prog_run include/linux/filter.h:664 [inline]
       __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
       bpf_trace_run4+0x179/0x460 kernel/trace/bpf_trace.c:2422
       __bpf_trace_sched_switch+0x13e/0x190 include/trace/events/sched.h:222
       trace_sched_switch include/trace/events/sched.h:222 [inline]
       __schedule+0x2266/0x5c70 kernel/sched/core.c:6733
       preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6915
       preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:12
       class_preempt_destructor include/linux/preempt.h:480 [inline]
       class_preempt_destructor include/linux/preempt.h:480 [inline]
       try_to_wake_up+0xc08/0x13e0 kernel/sched/core.c:4233
       wake_up_process kernel/sched/core.c:4510 [inline]
       wake_up_q+0x91/0x140 kernel/sched/core.c:1029
       futex_wake+0x43e/0x4e0 kernel/futex/waitwake.c:199
       do_futex+0x1e5/0x350 kernel/futex/syscalls.c:107
       __do_sys_futex kernel/futex/syscalls.c:179 [inline]
       __se_sys_futex kernel/futex/syscalls.c:160 [inline]
       __x64_sys_futex+0x1e1/0x4c0 kernel/futex/syscalls.c:160
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xd5/0x260 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x6d/0x75

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.3/7360:
 #0: ffff8880b953e6d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:559
 #1: ffffffff8d7b49e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #1: ffffffff8d7b49e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #1: ffffffff8d7b49e0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2380 [inline]
 #1: ffffffff8d7b49e0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x107/0x460 kernel/trace/bpf_trace.c:2422

stack backtrace:
CPU: 1 PID: 7360 Comm: syz-executor.3 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #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+0x116/0x1f0 lib/dump_stack.c:114
 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
 down_trylock+0x12/0x70 kernel/locking/semaphore.c:139
 __down_trylock_console_sem+0x40/0x140 kernel/printk/printk.c:323
 console_trylock kernel/printk/printk.c:2678 [inline]
 console_trylock_spinning kernel/printk/printk.c:1958 [inline]
 vprintk_emit kernel/printk/printk.c:2341 [inline]
 vprintk_emit+0xe4/0x5a0 kernel/printk/printk.c:2297
 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
 _printk+0xc8/0x100 kernel/printk/printk.c:2367
 __report_bug lib/bug.c:195 [inline]
 report_bug+0x4ac/0x580 lib/bug.c:219
 handle_bug+0x3d/0x70 arch/x86/kernel/traps.c:239
 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:260
 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
RIP: 0010:__local_bh_enable_ip+0xc3/0x120 kernel/softirq.c:362
Code: 00 e8 b1 6c 0b 00 e8 cc 68 42 00 fb 65 8b 05 0c f1 b0 7e 85 c0 74 52 5b 5d e9 d9 44 84 09 65 8b 05 4e a5 af 7e 85 c0 75 9e 90 <0f> 0b 90 eb 98 e8 f3 66 42 00 eb 99 48 89 ef e8 29 e0 19 00 eb a2
RSP: 0018:ffffc900137a7770 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000201 RCX: 1ffffffff1f3eed7
RDX: 0000000000000000 RSI: 0000000000000201 RDI: ffffffff88cc194d
RBP: ffffffff88cc194d R08: 0000000000000000 R09: ffffed100f604e3d
R10: ffff88807b0271eb R11: ffffffff9349a090 R12: ffff88802e3a0700
R13: ffffc900137df028 R14: 0000000000000000 R15: 0000000000000001
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 __sock_map_delete net/core/sock_map.c:424 [inline]
 sock_map_delete_elem+0xfd/0x150 net/core/sock_map.c:446
 bpf_prog_2c29ac5cdc6b1842+0x42/0x4a
 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
 __bpf_prog_run include/linux/filter.h:657 [inline]
 bpf_prog_run include/linux/filter.h:664 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
 bpf_trace_run4+0x179/0x460 kernel/trace/bpf_trace.c:2422
 __bpf_trace_sched_switch+0x13e/0x190 include/trace/events/sched.h:222
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x2266/0x5c70 kernel/sched/core.c:6733
 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6915
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:12
 class_preempt_destructor include/linux/preempt.h:480 [inline]
 class_preempt_destructor include/linux/preempt.h:480 [inline]
 try_to_wake_up+0xc08/0x13e0 kernel/sched/core.c:4233
 wake_up_process kernel/sched/core.c:4510 [inline]
 wake_up_q+0x91/0x140 kernel/sched/core.c:1029
 futex_wake+0x43e/0x4e0 kernel/futex/waitwake.c:199
 do_futex+0x1e5/0x350 kernel/futex/syscalls.c:107
 __do_sys_futex kernel/futex/syscalls.c:179 [inline]
 __se_sys_futex kernel/futex/syscalls.c:160 [inline]
 __x64_sys_futex+0x1e1/0x4c0 kernel/futex/syscalls.c:160
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd5/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7fc1f6e7de69
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:00007fc1f7b92178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fc1f6fabf88 RCX: 00007fc1f6e7de69
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fc1f6fabf8c
RBP: 00007fc1f6fabf80 R08: 0000000000000001 R09: 00007fc1f7b926c0
R10: 0000000000000005 R11: 0000000000000246 R12: 00007fc1f6fabf8c
R13: 000000000000000b R14: 00007ffe1f318da0 R15: 00007ffe1f318e88
 </TASK>
WARNING: CPU: 1 PID: 7360 at kernel/softirq.c:362 __local_bh_enable_ip+0xc3/0x120 kernel/softirq.c:362
Modules linked in:
CPU: 1 PID: 7360 Comm: syz-executor.3 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:__local_bh_enable_ip+0xc3/0x120 kernel/softirq.c:362
Code: 00 e8 b1 6c 0b 00 e8 cc 68 42 00 fb 65 8b 05 0c f1 b0 7e 85 c0 74 52 5b 5d e9 d9 44 84 09 65 8b 05 4e a5 af 7e 85 c0 75 9e 90 <0f> 0b 90 eb 98 e8 f3 66 42 00 eb 99 48 89 ef e8 29 e0 19 00 eb a2
RSP: 0018:ffffc900137a7770 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000201 RCX: 1ffffffff1f3eed7
RDX: 0000000000000000 RSI: 0000000000000201 RDI: ffffffff88cc194d
RBP: ffffffff88cc194d R08: 0000000000000000 R09: ffffed100f604e3d
R10: ffff88807b0271eb R11: ffffffff9349a090 R12: ffff88802e3a0700
R13: ffffc900137df028 R14: 0000000000000000 R15: 0000000000000001
FS:  00007fc1f7b926c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33a23000 CR3: 0000000047e9c000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 __sock_map_delete net/core/sock_map.c:424 [inline]
 sock_map_delete_elem+0xfd/0x150 net/core/sock_map.c:446
 bpf_prog_2c29ac5cdc6b1842+0x42/0x4a
 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
 __bpf_prog_run include/linux/filter.h:657 [inline]
 bpf_prog_run include/linux/filter.h:664 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
 bpf_trace_run4+0x179/0x460 kernel/trace/bpf_trace.c:2422
 __bpf_trace_sched_switch+0x13e/0x190 include/trace/events/sched.h:222
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x2266/0x5c70 kernel/sched/core.c:6733
 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6915
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:12
 class_preempt_destructor include/linux/preempt.h:480 [inline]
 class_preempt_destructor include/linux/preempt.h:480 [inline]
 try_to_wake_up+0xc08/0x13e0 kernel/sched/core.c:4233
 wake_up_process kernel/sched/core.c:4510 [inline]
 wake_up_q+0x91/0x140 kernel/sched/core.c:1029
 futex_wake+0x43e/0x4e0 kernel/futex/waitwake.c:199
 do_futex+0x1e5/0x350 kernel/futex/syscalls.c:107
 __do_sys_futex kernel/futex/syscalls.c:179 [inline]
 __se_sys_futex kernel/futex/syscalls.c:160 [inline]
 __x64_sys_futex+0x1e1/0x4c0 kernel/futex/syscalls.c:160
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd5/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7fc1f6e7de69
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:00007fc1f7b92178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fc1f6fabf88 RCX: 00007fc1f6e7de69
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fc1f6fabf8c
RBP: 00007fc1f6fabf80 R08: 0000000000000001 R09: 00007fc1f7b926c0
R10: 0000000000000005 R11: 0000000000000246 R12: 00007fc1f6fabf8c
R13: 000000000000000b R14: 00007ffe1f318da0 R15: 00007ffe1f318e88
 </TASK>