syzbot

=====================================================
WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected
5.15.153-syzkaller #0 Not tainted
-----------------------------------------------------
swapper/0/0 [HC0[0]:SC0[2]:HE0:SE0] is trying to acquire:
ffff88814ae8cb68 (&htab->buckets[i].lock){+...}-{2:2}, at: sock_hash_delete_elem+0xac/0x2f0 net/core/sock_map.c:937

and this task is already holding:
ffff8880b9a3a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
which would create a new lock dependency:
 (&rq->__lock){-.-.}-{2:2} -> (&htab->buckets[i].lock){+...}-{2:2}

but this new dependency connects a HARDIRQ-irq-safe lock:
 (&rq->__lock){-.-.}-{2:2}

... which became HARDIRQ-irq-safe at:
  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]
  scheduler_tick+0x97/0x500 kernel/sched/core.c:5296
  update_process_times+0x1ca/0x200 kernel/time/timer.c:1793
  tick_periodic+0x197/0x210 kernel/time/tick-common.c:100
  tick_handle_periodic+0x46/0x150 kernel/time/tick-common.c:112
  timer_interrupt+0x4d/0x60 arch/x86/kernel/time.c:57
  __handle_irq_event_percpu+0x292/0xa70 kernel/irq/handle.c:156
  handle_irq_event_percpu kernel/irq/handle.c:196 [inline]
  handle_irq_event+0xff/0x2b0 kernel/irq/handle.c:213
  handle_edge_irq+0x245/0xbf0 kernel/irq/chip.c:822
  generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
  handle_irq arch/x86/kernel/irq.c:231 [inline]
  __common_interrupt+0xd7/0x1f0 arch/x86/kernel/irq.c:250
  common_interrupt+0x9f/0xc0 arch/x86/kernel/irq.c:240
  asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:629
  console_unlock+0xe53/0x12b0 kernel/printk/printk.c:2743
  vprintk_emit+0xbf/0x150 kernel/printk/printk.c:2268
  _printk+0xd1/0x111 kernel/printk/printk.c:2293
  spectre_v2_select_mitigation+0x4b9/0x748 arch/x86/kernel/cpu/bugs.c:1626
  cpu_select_mitigations+0x3d/0x8f arch/x86/kernel/cpu/bugs.c:151
  arch_cpu_finalize_init+0xf/0x81 arch/x86/kernel/cpu/common.c:2253
  start_kernel+0x419/0x535 init/main.c:1105
  secondary_startup_64_no_verify+0xb1/0xbb

to a HARDIRQ-irq-unsafe lock:
 (&htab->buckets[i].lock){+...}-{2:2}

... which became HARDIRQ-irq-unsafe at:
...
  lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
  __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
  _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:178
  sock_hash_free+0x14c/0x780 net/core/sock_map.c:1154
  process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
  worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
  kthread+0x3f6/0x4f0 kernel/kthread.c:319
  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

other info that might help us debug this:

 Possible interrupt unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&htab->buckets[i].lock);
                               local_irq_disable();
                               lock(&rq->__lock);
                               lock(&htab->buckets[i].lock);
  <Interrupt>
    lock(&rq->__lock);

 *** DEADLOCK ***

2 locks held by swapper/0/0:
 #0: ffff8880b9a3a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
 #1: ffffffff8c91f720 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311

the dependencies between HARDIRQ-irq-safe lock and the holding lock:
-> (&rq->__lock){-.-.}-{2:2} {
   IN-HARDIRQ-W at:
                    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]
                    scheduler_tick+0x97/0x500 kernel/sched/core.c:5296
                    update_process_times+0x1ca/0x200 kernel/time/timer.c:1793
                    tick_periodic+0x197/0x210 kernel/time/tick-common.c:100
                    tick_handle_periodic+0x46/0x150 kernel/time/tick-common.c:112
                    timer_interrupt+0x4d/0x60 arch/x86/kernel/time.c:57
                    __handle_irq_event_percpu+0x292/0xa70 kernel/irq/handle.c:156
                    handle_irq_event_percpu kernel/irq/handle.c:196 [inline]
                    handle_irq_event+0xff/0x2b0 kernel/irq/handle.c:213
                    handle_edge_irq+0x245/0xbf0 kernel/irq/chip.c:822
                    generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
                    handle_irq arch/x86/kernel/irq.c:231 [inline]
                    __common_interrupt+0xd7/0x1f0 arch/x86/kernel/irq.c:250
                    common_interrupt+0x9f/0xc0 arch/x86/kernel/irq.c:240
                    asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:629
                    console_unlock+0xe53/0x12b0 kernel/printk/printk.c:2743
                    vprintk_emit+0xbf/0x150 kernel/printk/printk.c:2268
                    _printk+0xd1/0x111 kernel/printk/printk.c:2293
                    spectre_v2_select_mitigation+0x4b9/0x748 arch/x86/kernel/cpu/bugs.c:1626
                    cpu_select_mitigations+0x3d/0x8f arch/x86/kernel/cpu/bugs.c:151
                    arch_cpu_finalize_init+0xf/0x81 arch/x86/kernel/cpu/common.c:2253
                    start_kernel+0x419/0x535 init/main.c:1105
                    secondary_startup_64_no_verify+0xb1/0xbb
   IN-SOFTIRQ-W at:
                    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]
                    ttwu_queue kernel/sched/core.c:3821 [inline]
                    try_to_wake_up+0x6dd/0x1300 kernel/sched/core.c:4146
                    call_timer_fn+0x16d/0x560 kernel/time/timer.c:1421
                    expire_timers kernel/time/timer.c:1466 [inline]
                    __run_timers+0x67c/0x890 kernel/time/timer.c:1737
                    run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1750
                    __do_softirq+0x3b3/0x93a kernel/softirq.c:558
                    invoke_softirq kernel/softirq.c:432 [inline]
                    __irq_exit_rcu+0x155/0x240 kernel/softirq.c:637
                    irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
                    sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1096
                    asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
                    native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
                    arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
                    default_idle+0xb/0x10 arch/x86/kernel/process.c:717
                    default_idle_call+0x81/0xc0 kernel/sched/idle.c:112
                    cpuidle_idle_call kernel/sched/idle.c:194 [inline]
                    do_idle+0x271/0x670 kernel/sched/idle.c:306
                    cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403
                    start_kernel+0x48c/0x535 init/main.c:1138
                    secondary_startup_64_no_verify+0xb1/0xbb
   INITIAL USE at:
                   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]
                   _raw_spin_rq_lock_irqsave kernel/sched/sched.h:1345 [inline]
                   rq_attach_root+0xec/0x440 kernel/sched/topology.c:470
                   sched_init+0x6a4/0xbdd kernel/sched/core.c:9502
                   start_kernel+0x1b6/0x535 init/main.c:1007
                   secondary_startup_64_no_verify+0xb1/0xbb
 }
 ... key      at: [<ffffffff8f5dcc40>] sched_init.__key+0x0/0x20

the dependencies between the lock to be acquired
 and HARDIRQ-irq-unsafe lock:
-> (&htab->buckets[i].lock){+...}-{2:2} {
   HARDIRQ-ON-W at:
                    lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
                    __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
                    _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:178
                    sock_hash_free+0x14c/0x780 net/core/sock_map.c:1154
                    process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
                    worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
                    kthread+0x3f6/0x4f0 kernel/kthread.c:319
                    ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
   INITIAL USE at:
                   lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
                   __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
                   _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:178
                   sock_hash_free+0x14c/0x780 net/core/sock_map.c:1154
                   process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
                   worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
                   kthread+0x3f6/0x4f0 kernel/kthread.c:319
                   ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 }
 ... key      at: [<ffffffff9178a740>] sock_hash_alloc.__key+0x0/0x20
 ... acquired at:
   lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
   __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
   _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:178
   sock_hash_delete_elem+0xac/0x2f0 net/core/sock_map.c:937
   bpf_prog_a8aaa52f2e199321+0x42/0x548
   bpf_dispatcher_nop_func include/linux/bpf.h:785 [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:1880 [inline]
   bpf_trace_run3+0x1d1/0x380 kernel/trace/bpf_trace.c:1918
   trace_sched_switch include/trace/events/sched.h:220 [inline]
   __schedule+0x1e8d/0x45b0 kernel/sched/core.c:6373
   schedule_idle+0x4a/0x90 kernel/sched/core.c:6487
   do_idle+0x61e/0x670 kernel/sched/idle.c:334
   cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403
   start_kernel+0x48c/0x535 init/main.c:1138
   secondary_startup_64_no_verify+0xb1/0xbb


stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.15.153-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
 print_bad_irq_dependency kernel/locking/lockdep.c:2567 [inline]
 check_irq_usage kernel/locking/lockdep.c:2806 [inline]
 check_prev_add kernel/locking/lockdep.c:3057 [inline]
 check_prevs_add kernel/locking/lockdep.c:3172 [inline]
 validate_chain+0x4d01/0x5930 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_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:178
 sock_hash_delete_elem+0xac/0x2f0 net/core/sock_map.c:937
 bpf_prog_a8aaa52f2e199321+0x42/0x548
 bpf_dispatcher_nop_func include/linux/bpf.h:785 [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:1880 [inline]
 bpf_trace_run3+0x1d1/0x380 kernel/trace/bpf_trace.c:1918
 trace_sched_switch include/trace/events/sched.h:220 [inline]
 __schedule+0x1e8d/0x45b0 kernel/sched/core.c:6373
 schedule_idle+0x4a/0x90 kernel/sched/core.c:6487
 do_idle+0x61e/0x670 kernel/sched/idle.c:334
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403
 start_kernel+0x48c/0x535 init/main.c:1138
 secondary_startup_64_no_verify+0xb1/0xbb
 </TASK>