------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted
------------------------------------------------------
kworker/u8:4/61 is trying to acquire lock:
ffffffff8d79e758 ((console_sem).lock){-.-.}-{2:2}, at: down_trylock+0x12/0x70 kernel/locking/semaphore.c:139

but task is already holding lock:
ffff8880b942a858 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x5d/0x220 kernel/time/timer.c:1051

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&base->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
       lock_timer_base+0x5d/0x220 kernel/time/timer.c:1051
       __mod_timer+0x426/0xdc0 kernel/time/timer.c:1132
       add_timer_global+0x8a/0xc0 kernel/time/timer.c:1330
       __queue_delayed_work+0x1ba/0x2e0 kernel/workqueue.c:2567
       queue_delayed_work_on+0x10e/0x130 kernel/workqueue.c:2595
       psi_task_change+0x1b4/0x2e0 kernel/sched/psi.c:912
       psi_enqueue kernel/sched/stats.h:139 [inline]
       enqueue_task kernel/sched/core.c:2112 [inline]
       activate_task+0x213/0x400 kernel/sched/core.c:2146
       wake_up_new_task+0x574/0xc80 kernel/sched/core.c:4901
       kernel_clone+0x236/0x940 kernel/fork.c:2827
       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

-> #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+0x3cf/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
       do_con_write+0x16ef/0x7f50 drivers/tty/vt/vt.c:2918
       con_write+0x23/0xc0 drivers/tty/vt/vt.c:3251
       process_output_block drivers/tty/n_tty.c:574 [inline]
       n_tty_write+0x423/0x1150 drivers/tty/n_tty.c:2379
       iterate_tty_write drivers/tty/tty_io.c:1021 [inline]
       file_tty_write.constprop.0+0x518/0x9b0 drivers/tty/tty_io.c:1096
       call_write_iter include/linux/fs.h:2108 [inline]
       new_sync_write fs/read_write.c:497 [inline]
       vfs_write+0x6db/0x1100 fs/read_write.c:590
       ksys_write+0x12f/0x260 fs/read_write.c:643
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xd2/0x260 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_run+0x3e51/0xae80 kernel/bpf/core.c:1997
       __bpf_prog_run32+0xc1/0x100 kernel/bpf/core.c:2236
       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_run2+0x151/0x420 kernel/trace/bpf_trace.c:2420
       __bpf_trace_timer_start+0xc7/0x100 include/trace/events/timer.h:52
       trace_timer_start include/trace/events/timer.h:52 [inline]
       enqueue_timer+0x2b4/0x520 kernel/time/timer.c:663
       internal_add_timer kernel/time/timer.c:688 [inline]
       __mod_timer+0x8d7/0xdc0 kernel/time/timer.c:1183
       add_timer_global+0x8a/0xc0 kernel/time/timer.c:1330
       __queue_delayed_work+0x1ba/0x2e0 kernel/workqueue.c:2567
       queue_delayed_work_on+0x10e/0x130 kernel/workqueue.c:2595
       queue_delayed_work include/linux/workqueue.h:620 [inline]
       batadv_nc_start_timer net/batman-adv/network-coding.c:72 [inline]
       batadv_nc_worker+0xb6f/0x10f0 net/batman-adv/network-coding.c:741
       process_one_work+0x9a9/0x1a60 kernel/workqueue.c:3254
       process_scheduled_works kernel/workqueue.c:3335 [inline]
       worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416
       kthread+0x2c1/0x3a0 kernel/kthread.c:388
       ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243

other info that might help us debug this:

Chain exists of:
  (console_sem).lock --> &rq->__lock --> &base->lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&base->lock);
                               lock(&rq->__lock);
                               lock(&base->lock);
  lock((console_sem).lock);

 *** DEADLOCK ***

4 locks held by kworker/u8:4/61:
 #0: ffff88802ae28948 ((wq_completion)bat_events){+.+.}-{0:0}, at: process_one_work+0x1296/0x1a60 kernel/workqueue.c:3229
 #1: ffffc900015c7d80 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work+0x906/0x1a60 kernel/workqueue.c:3230
 #2: ffff8880b942a858 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x5d/0x220 kernel/time/timer.c:1051
 #3: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #3: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #3: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2380 [inline]
 #3: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0xe4/0x420 kernel/trace/bpf_trace.c:2420

stack backtrace:
CPU: 0 PID: 61 Comm: kworker/u8:4 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: bat_events batadv_nc_worker
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 81 6c 0b 00 e8 4c 69 42 00 fb 65 8b 05 cc 34 b2 7e 85 c0 74 52 5b 5d c3 cc cc cc cc 65 8b 05 4e e9 b0 7e 85 c0 75 9e 90 <0f> 0b 90 eb 98 e8 73 67 42 00 eb 99 48 89 ef e8 f9 df 19 00 eb a2
RSP: 0018:ffffc900015c76d0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000201 RCX: 1ffffffff1f3d467
RDX: 0000000000000000 RSI: 0000000000000201 RDI: ffffffff88cb3a2d
RBP: ffffffff88cb3a2d R08: 0000000000000000 R09: ffffed100b8e993d
R10: ffff88805c74c9eb R11: ffffffff93474b98 R12: ffff88801edcfb80
R13: ffffffff81a75260 R14: 0000000000000000 R15: 0000000000000000
 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_run+0x3e51/0xae80 kernel/bpf/core.c:1997
 __bpf_prog_run32+0xc1/0x100 kernel/bpf/core.c:2236
 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_run2+0x151/0x420 kernel/trace/bpf_trace.c:2420
 __bpf_trace_timer_start+0xc7/0x100 include/trace/events/timer.h:52
 trace_timer_start include/trace/events/timer.h:52 [inline]
 enqueue_timer+0x2b4/0x520 kernel/time/timer.c:663
 internal_add_timer kernel/time/timer.c:688 [inline]
 __mod_timer+0x8d7/0xdc0 kernel/time/timer.c:1183
 add_timer_global+0x8a/0xc0 kernel/time/timer.c:1330
 __queue_delayed_work+0x1ba/0x2e0 kernel/workqueue.c:2567
 queue_delayed_work_on+0x10e/0x130 kernel/workqueue.c:2595
 queue_delayed_work include/linux/workqueue.h:620 [inline]
 batadv_nc_start_timer net/batman-adv/network-coding.c:72 [inline]
 batadv_nc_worker+0xb6f/0x10f0 net/batman-adv/network-coding.c:741
 process_one_work+0x9a9/0x1a60 kernel/workqueue.c:3254
 process_scheduled_works kernel/workqueue.c:3335 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
 </TASK>
WARNING: CPU: 0 PID: 61 at kernel/softirq.c:362 __local_bh_enable_ip+0xc3/0x120 kernel/softirq.c:362
Modules linked in:
CPU: 0 PID: 61 Comm: kworker/u8:4 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: bat_events batadv_nc_worker
RIP: 0010:__local_bh_enable_ip+0xc3/0x120 kernel/softirq.c:362
Code: 00 e8 81 6c 0b 00 e8 4c 69 42 00 fb 65 8b 05 cc 34 b2 7e 85 c0 74 52 5b 5d c3 cc cc cc cc 65 8b 05 4e e9 b0 7e 85 c0 75 9e 90 <0f> 0b 90 eb 98 e8 73 67 42 00 eb 99 48 89 ef e8 f9 df 19 00 eb a2
RSP: 0018:ffffc900015c76d0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000201 RCX: 1ffffffff1f3d467
RDX: 0000000000000000 RSI: 0000000000000201 RDI: ffffffff88cb3a2d
RBP: ffffffff88cb3a2d R08: 0000000000000000 R09: ffffed100b8e993d
R10: ffff88805c74c9eb R11: ffffffff93474b98 R12: ffff88801edcfb80
R13: ffffffff81a75260 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001929010 CR3: 000000002a0ce000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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_run+0x3e51/0xae80 kernel/bpf/core.c:1997
 __bpf_prog_run32+0xc1/0x100 kernel/bpf/core.c:2236
 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_run2+0x151/0x420 kernel/trace/bpf_trace.c:2420
 __bpf_trace_timer_start+0xc7/0x100 include/trace/events/timer.h:52
 trace_timer_start include/trace/events/timer.h:52 [inline]
 enqueue_timer+0x2b4/0x520 kernel/time/timer.c:663
 internal_add_timer kernel/time/timer.c:688 [inline]
 __mod_timer+0x8d7/0xdc0 kernel/time/timer.c:1183
 add_timer_global+0x8a/0xc0 kernel/time/timer.c:1330
 __queue_delayed_work+0x1ba/0x2e0 kernel/workqueue.c:2567
 queue_delayed_work_on+0x10e/0x130 kernel/workqueue.c:2595
 queue_delayed_work include/linux/workqueue.h:620 [inline]
 batadv_nc_start_timer net/batman-adv/network-coding.c:72 [inline]
 batadv_nc_worker+0xb6f/0x10f0 net/batman-adv/network-coding.c:741
 process_one_work+0x9a9/0x1a60 kernel/workqueue.c:3254
 process_scheduled_works kernel/workqueue.c:3335 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
 </TASK>