===================================================== WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected 6.8.0-syzkaller-05236-g443574b03387 #0 Not tainted ----------------------------------------------------- kworker/u8:4/62 [HC0[0]:SC0[2]:HE0:SE0] is trying to acquire: ffff88801fbfa218 (&htab->buckets[i].lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] ffff88801fbfa218 (&htab->buckets[i].lock){+...}-{2:2}, at: sock_hash_delete_elem+0xb0/0x300 net/core/sock_map.c:939 and this task is already holding: ffff888016eb6120 ((worker)->lock){....}-{2:2}, at: kthread_queue_work+0x27/0x180 kernel/kthread.c:1019 which would create a new lock dependency: ((worker)->lock){....}-{2:2} -> (&htab->buckets[i].lock){+...}-{2:2} but this new dependency connects a HARDIRQ-irq-safe lock: (&pool->lock){-.-.}-{2:2} ... which became HARDIRQ-irq-safe at: lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 __queue_work+0x6ec/0xec0 queue_work_on+0x14f/0x250 kernel/workqueue.c:2435 hrtimer_switch_to_hres kernel/time/hrtimer.c:750 [inline] hrtimer_run_queues+0x154/0x460 kernel/time/hrtimer.c:1918 run_local_timers kernel/time/timer.c:2453 [inline] update_process_times+0x80/0x230 kernel/time/timer.c:2475 tick_periodic+0x190/0x220 kernel/time/tick-common.c:100 tick_handle_periodic+0x4a/0x160 kernel/time/tick-common.c:112 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x107/0x3a0 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 kasan_check_range+0x7/0x290 mm/kasan/generic.c:188 instrument_atomic_read include/linux/instrumented.h:68 [inline] atomic_long_read include/linux/atomic/atomic-instrumented.h:3188 [inline] rwsem_owner_flags kernel/locking/rwsem.c:284 [inline] rwsem_spin_on_owner+0x1fb/0x2f0 kernel/locking/rwsem.c:767 rwsem_optimistic_spin kernel/locking/rwsem.c:839 [inline] rwsem_down_write_slowpath+0x272/0x13b0 kernel/locking/rwsem.c:1113 __down_write_common+0x1af/0x200 kernel/locking/rwsem.c:1306 early_event_add_tracer+0x4a/0x80 kernel/trace/trace_events.c:3942 event_trace_init+0xeb/0x170 kernel/trace/trace_events.c:4100 tracer_init_tracefs_work_func+0x11/0x140 kernel/trace/trace.c:10175 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 to a HARDIRQ-irq-unsafe lock: (&htab->buckets[i].lock){+...}-{2:2} ... which became HARDIRQ-irq-unsafe at: ... lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] sock_hash_free+0x164/0x820 net/core/sock_map.c:1154 bpf_map_free_deferred+0xe6/0x110 kernel/bpf/syscall.c:734 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/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: &pool->lock --> (worker)->lock --> &htab->buckets[i].lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&htab->buckets[i].lock); local_irq_disable(); lock(&pool->lock); lock((worker)->lock); lock(&pool->lock); *** DEADLOCK *** 5 locks held by kworker/u8:4/62: #0: ffff888014c81148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888014c81148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x8e0/0x1770 kernel/workqueue.c:3335 #1: ffffc900015d7d00 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc900015d7d00 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_scheduled_works+0x91b/0x1770 kernel/workqueue.c:3335 #2: ffffffff8e136cb8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline] #2: ffffffff8e136cb8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x39a/0x820 kernel/rcu/tree_exp.h:939 #3: ffff888016eb6120 ((worker)->lock){....}-{2:2}, at: kthread_queue_work+0x27/0x180 kernel/kthread.c:1019 #4: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #4: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #4: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2380 [inline] #4: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x114/0x420 kernel/trace/bpf_trace.c:2420 the dependencies between HARDIRQ-irq-safe lock and the holding lock: -> (&pool->lock){-.-.}-{2:2} { IN-HARDIRQ-W at: lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 __queue_work+0x6ec/0xec0 queue_work_on+0x14f/0x250 kernel/workqueue.c:2435 hrtimer_switch_to_hres kernel/time/hrtimer.c:750 [inline] hrtimer_run_queues+0x154/0x460 kernel/time/hrtimer.c:1918 run_local_timers kernel/time/timer.c:2453 [inline] update_process_times+0x80/0x230 kernel/time/timer.c:2475 tick_periodic+0x190/0x220 kernel/time/tick-common.c:100 tick_handle_periodic+0x4a/0x160 kernel/time/tick-common.c:112 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x107/0x3a0 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 kasan_check_range+0x7/0x290 mm/kasan/generic.c:188 instrument_atomic_read include/linux/instrumented.h:68 [inline] atomic_long_read include/linux/atomic/atomic-instrumented.h:3188 [inline] rwsem_owner_flags kernel/locking/rwsem.c:284 [inline] rwsem_spin_on_owner+0x1fb/0x2f0 kernel/locking/rwsem.c:767 rwsem_optimistic_spin kernel/locking/rwsem.c:839 [inline] rwsem_down_write_slowpath+0x272/0x13b0 kernel/locking/rwsem.c:1113 __down_write_common+0x1af/0x200 kernel/locking/rwsem.c:1306 early_event_add_tracer+0x4a/0x80 kernel/trace/trace_events.c:3942 event_trace_init+0xeb/0x170 kernel/trace/trace_events.c:4100 tracer_init_tracefs_work_func+0x11/0x140 kernel/trace/trace.c:10175 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 IN-SOFTIRQ-W at: lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 __queue_work+0x6ec/0xec0 call_timer_fn+0x17e/0x600 kernel/time/timer.c:1792 expire_timers kernel/time/timer.c:1838 [inline] __run_timers kernel/time/timer.c:2408 [inline] __run_timer_base+0x695/0x8e0 kernel/time/timer.c:2419 run_timer_base kernel/time/timer.c:2428 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2438 __do_softirq+0x2bc/0x943 kernel/softirq.c:554 invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf2/0x1c0 kernel/softirq.c:633 irq_exit_rcu+0x9/0x30 kernel/softirq.c:645 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline] default_idle+0x13/0x20 arch/x86/kernel/process.c:742 default_idle_call+0x74/0xb0 kernel/sched/idle.c:117 cpuidle_idle_call kernel/sched/idle.c:191 [inline] do_idle+0x22f/0x5d0 kernel/sched/idle.c:332 cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:430 rest_init+0x2e0/0x300 init/main.c:730 arch_call_rest_init+0xe/0x10 init/main.c:831 start_kernel+0x47a/0x500 init/main.c:1077 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:509 x86_64_start_kernel+0x99/0xa0 arch/x86/kernel/head64.c:490 common_startup_64+0x13e/0x147 INITIAL USE at: lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 __queue_work+0x6ec/0xec0 queue_work_on+0x14f/0x250 kernel/workqueue.c:2435 queue_work include/linux/workqueue.h:605 [inline] start_poll_synchronize_rcu_expedited+0xf7/0x150 kernel/rcu/tree_exp.h:1017 rcu_init+0xea/0x140 kernel/rcu/tree.c:5240 start_kernel+0x1f7/0x500 init/main.c:969 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:509 x86_64_start_kernel+0x99/0xa0 arch/x86/kernel/head64.c:490 common_startup_64+0x13e/0x147 } ... key at: [] init_worker_pool.__key+0x0/0x20 -> ((worker)->lock){....}-{2:2} { INITIAL USE at: lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline] _raw_spin_lock_irq+0xd3/0x120 kernel/locking/spinlock.c:170 kthread_worker_fn+0x236/0xab0 kernel/kthread.c:828 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 } ... key at: [] __kthread_create_worker.__key+0x0/0x20 ... acquired at: lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 kthread_queue_work+0x27/0x180 kernel/kthread.c:1019 put_pwq kernel/workqueue.c:1642 [inline] put_pwq_unlocked+0x12a/0x190 kernel/workqueue.c:1659 apply_wqattrs_cleanup kernel/workqueue.c:5098 [inline] apply_workqueue_attrs_locked+0x132/0x210 kernel/workqueue.c:5219 apply_workqueue_attrs+0x30/0x50 kernel/workqueue.c:5249 padata_setup_cpumasks kernel/padata.c:435 [inline] padata_alloc+0x22b/0x370 kernel/padata.c:1014 pcrypt_init_padata+0x27/0x100 crypto/pcrypt.c:327 pcrypt_init+0x65/0xe0 crypto/pcrypt.c:352 do_one_initcall+0x238/0x830 init/main.c:1241 do_initcall_level+0x157/0x210 init/main.c:1303 do_initcalls+0x3f/0x80 init/main.c:1319 kernel_init_freeable+0x435/0x5d0 init/main.c:1557 kernel_init+0x1d/0x2a0 init/main.c:1446 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 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+0x1e4/0x530 kernel/locking/lockdep.c:5754 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] sock_hash_free+0x164/0x820 net/core/sock_map.c:1154 bpf_map_free_deferred+0xe6/0x110 kernel/bpf/syscall.c:734 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 INITIAL USE at: lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] sock_hash_free+0x164/0x820 net/core/sock_map.c:1154 bpf_map_free_deferred+0xe6/0x110 kernel/bpf/syscall.c:734 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 } ... key at: [] sock_hash_alloc.__key+0x0/0x20 ... acquired at: lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] sock_hash_delete_elem+0xb0/0x300 net/core/sock_map.c:939 bpf_prog_2c29ac5cdc6b1842+0x42/0x46 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+0x204/0x420 kernel/trace/bpf_trace.c:2420 trace_sched_kthread_work_queue_work include/trace/events/sched.h:64 [inline] kthread_insert_work+0x3f4/0x460 kernel/kthread.c:993 kthread_queue_work+0xff/0x180 kernel/kthread.c:1021 synchronize_rcu_expedited_queue_work kernel/rcu/tree_exp.h:469 [inline] synchronize_rcu_expedited+0x593/0x820 kernel/rcu/tree_exp.h:949 synchronize_rcu+0x136/0x3e0 kernel/rcu/tree.c:3611 sock_hash_free+0xac/0x820 net/core/sock_map.c:1144 bpf_map_free_deferred+0xe6/0x110 kernel/bpf/syscall.c:734 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 stack backtrace: CPU: 1 PID: 62 Comm: kworker/u8:4 Not tainted 6.8.0-syzkaller-05236-g443574b03387 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: events_unbound bpf_map_free_deferred Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 print_bad_irq_dependency kernel/locking/lockdep.c:2626 [inline] check_irq_usage kernel/locking/lockdep.c:2865 [inline] check_prev_add kernel/locking/lockdep.c:3138 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain+0x4dc7/0x58e0 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] sock_hash_delete_elem+0xb0/0x300 net/core/sock_map.c:939 bpf_prog_2c29ac5cdc6b1842+0x42/0x46 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+0x204/0x420 kernel/trace/bpf_trace.c:2420 trace_sched_kthread_work_queue_work include/trace/events/sched.h:64 [inline] kthread_insert_work+0x3f4/0x460 kernel/kthread.c:993 kthread_queue_work+0xff/0x180 kernel/kthread.c:1021 synchronize_rcu_expedited_queue_work kernel/rcu/tree_exp.h:469 [inline] synchronize_rcu_expedited+0x593/0x820 kernel/rcu/tree_exp.h:949 synchronize_rcu+0x136/0x3e0 kernel/rcu/tree.c:3611 sock_hash_free+0xac/0x820 net/core/sock_map.c:1144 bpf_map_free_deferred+0xe6/0x110 kernel/bpf/syscall.c:734 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 ------------[ cut here ]------------ raw_local_irq_restore() called with IRQs enabled WARNING: CPU: 1 PID: 62 at kernel/locking/irqflag-debug.c:10 warn_bogus_irq_restore+0x29/0x40 kernel/locking/irqflag-debug.c:10 Modules linked in: CPU: 1 PID: 62 Comm: kworker/u8:4 Not tainted 6.8.0-syzkaller-05236-g443574b03387 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: events_unbound bpf_map_free_deferred RIP: 0010:warn_bogus_irq_restore+0x29/0x40 kernel/locking/irqflag-debug.c:10 Code: 90 f3 0f 1e fa 90 80 3d de 59 01 04 00 74 06 90 c3 cc cc cc cc c6 05 cf 59 01 04 01 90 48 c7 c7 20 ba aa 8b e8 f8 d5 e7 f5 90 <0f> 0b 90 90 90 c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f RSP: 0018:ffffc900015d7598 EFLAGS: 00010246 RAX: 8757884f84b05700 RBX: 1ffff920002baeb8 RCX: ffff888017b03c00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900015d7630 R08: ffffffff8157cc12 R09: 1ffff920002bae08 R10: dffffc0000000000 R11: fffff520002bae09 R12: dffffc0000000000 R13: 1ffff920002baeb4 R14: ffffc900015d75c0 R15: 0000000000000246 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000020aa8000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock_irqrestore+0x120/0x140 kernel/locking/spinlock.c:194 kthread_queue_work+0x110/0x180 kernel/kthread.c:1024 synchronize_rcu_expedited_queue_work kernel/rcu/tree_exp.h:469 [inline] synchronize_rcu_expedited+0x593/0x820 kernel/rcu/tree_exp.h:949 synchronize_rcu+0x136/0x3e0 kernel/rcu/tree.c:3611 sock_hash_free+0xac/0x820 net/core/sock_map.c:1144 bpf_map_free_deferred+0xe6/0x110 kernel/bpf/syscall.c:734 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243