===================================================== WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected 6.1.84-syzkaller #0 Not tainted ----------------------------------------------------- kworker/1:0/22 [HC0[0]:SC0[2]:HE0:SE0] is trying to acquire: ffff888026111d68 (&htab->buckets[i].lock){+.-.}-{2:2}, at: sock_hash_delete_elem+0xac/0x2f0 net/core/sock_map.c:932 and this task is already holding: ffff8880b9928358 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x120/0x260 kernel/time/timer.c:999 which would create a new lock dependency: (&base->lock){-.-.}-{2:2} -> (&htab->buckets[i].lock){+.-.}-{2:2} but this new dependency connects a HARDIRQ-irq-safe lock: (&base->lock){-.-.}-{2:2} ... which became HARDIRQ-irq-safe at: 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 lock_timer_base+0x120/0x260 kernel/time/timer.c:999 add_timer_on+0x1eb/0x580 kernel/time/timer.c:1239 handle_irq_event_percpu kernel/irq/handle.c:195 [inline] handle_irq_event+0xa9/0x1e0 kernel/irq/handle.c:210 handle_edge_irq+0x245/0xbf0 kernel/irq/chip.c:819 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:644 console_emit_next_record+0xd67/0x1000 kernel/printk/printk.c:2786 console_unlock+0x278/0x7c0 kernel/printk/printk.c:2906 vprintk_emit+0x523/0x740 kernel/printk/printk.c:2303 _printk+0xd1/0x111 kernel/printk/printk.c:2328 calibrate_delay+0x158f/0x16a0 init/calibrate.c:308 start_kernel+0x41e/0x53f init/main.c:1104 secondary_startup_64_no_verify+0xcf/0xdb to a HARDIRQ-irq-unsafe lock: (&htab->buckets[i].lock){+.-.}-{2:2} ... which became HARDIRQ-irq-unsafe at: ... lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:178 sock_hash_free+0x160/0x820 net/core/sock_map.c:1149 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:307 other info that might help us debug this: Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&htab->buckets[i].lock); local_irq_disable(); lock(&base->lock); lock(&htab->buckets[i].lock); lock(&base->lock); *** DEADLOCK *** 4 locks held by kworker/1:0/22: #0: ffff888012472138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267 #1: ffffc900001c7d20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267 #2: ffff8880b9928358 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x120/0x260 kernel/time/timer.c:999 #3: ffffffff8d12a980 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #3: ffffffff8d12a980 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #3: ffffffff8d12a980 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2272 [inline] #3: ffffffff8d12a980 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x16a/0x470 kernel/trace/bpf_trace.c:2314 the dependencies between HARDIRQ-irq-safe lock and the holding lock: -> (&base->lock){-.-.}-{2:2} { IN-HARDIRQ-W at: 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 lock_timer_base+0x120/0x260 kernel/time/timer.c:999 add_timer_on+0x1eb/0x580 kernel/time/timer.c:1239 handle_irq_event_percpu kernel/irq/handle.c:195 [inline] handle_irq_event+0xa9/0x1e0 kernel/irq/handle.c:210 handle_edge_irq+0x245/0xbf0 kernel/irq/chip.c:819 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:644 console_emit_next_record+0xd67/0x1000 kernel/printk/printk.c:2786 console_unlock+0x278/0x7c0 kernel/printk/printk.c:2906 vprintk_emit+0x523/0x740 kernel/printk/printk.c:2303 _printk+0xd1/0x111 kernel/printk/printk.c:2328 calibrate_delay+0x158f/0x16a0 init/calibrate.c:308 start_kernel+0x41e/0x53f init/main.c:1104 secondary_startup_64_no_verify+0xcf/0xdb IN-SOFTIRQ-W at: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline] _raw_spin_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:170 __run_timers+0x111/0x890 kernel/time/timer.c:1802 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833 __do_softirq+0x2e9/0xa4c kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x155/0x240 kernel/softirq.c:650 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662 common_interrupt+0xa4/0xc0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:644 console_emit_next_record+0xd67/0x1000 kernel/printk/printk.c:2786 console_unlock+0x278/0x7c0 kernel/printk/printk.c:2906 vprintk_emit+0x523/0x740 kernel/printk/printk.c:2303 _printk+0xd1/0x111 kernel/printk/printk.c:2328 spectre_v2_select_mitigation+0x53f/0x7d3 arch/x86/kernel/cpu/bugs.c:1698 cpu_select_mitigations+0x3d/0x8f arch/x86/kernel/cpu/bugs.c:148 arch_cpu_finalize_init+0xf/0x81 arch/x86/kernel/cpu/common.c:2449 start_kernel+0x423/0x53f init/main.c:1106 secondary_startup_64_no_verify+0xcf/0xdb INITIAL USE at: 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 lock_timer_base+0x120/0x260 kernel/time/timer.c:999 add_timer_on+0x1eb/0x580 kernel/time/timer.c:1239 handle_irq_event_percpu kernel/irq/handle.c:195 [inline] handle_irq_event+0xa9/0x1e0 kernel/irq/handle.c:210 handle_edge_irq+0x245/0xbf0 kernel/irq/chip.c:819 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:644 console_emit_next_record+0xd67/0x1000 kernel/printk/printk.c:2786 console_unlock+0x278/0x7c0 kernel/printk/printk.c:2906 vprintk_emit+0x523/0x740 kernel/printk/printk.c:2303 _printk+0xd1/0x111 kernel/printk/printk.c:2328 calibrate_delay+0x158f/0x16a0 init/calibrate.c:308 start_kernel+0x41e/0x53f init/main.c:1104 secondary_startup_64_no_verify+0xcf/0xdb } ... key at: [] init_timer_cpu.__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+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:178 sock_hash_free+0x160/0x820 net/core/sock_map.c:1149 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:307 IN-SOFTIRQ-W at: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:178 sock_hash_delete_elem+0xac/0x2f0 net/core/sock_map.c:932 0xffffffffa0003856 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 __bpf_trace_mm_page_alloc+0xba/0xe0 include/trace/events/kmem.h:177 trace_mm_page_alloc include/trace/events/kmem.h:177 [inline] __alloc_pages+0x717/0x770 mm/page_alloc.c:5569 skb_page_frag_refill+0x154/0x2e0 net/core/sock.c:2872 add_recvbuf_mergeable drivers/net/virtio_net.c:1419 [inline] try_fill_recv+0x546/0x1850 drivers/net/virtio_net.c:1460 virtnet_receive drivers/net/virtio_net.c:1574 [inline] virtnet_poll+0x8f7/0x1470 drivers/net/virtio_net.c:1680 __napi_poll+0xc7/0x470 net/core/dev.c:6537 napi_poll net/core/dev.c:6604 [inline] net_rx_action+0x70f/0xeb0 net/core/dev.c:6718 __do_softirq+0x2e9/0xa4c kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x155/0x240 kernel/softirq.c:650 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662 common_interrupt+0xa4/0xc0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:644 unwind_next_frame+0xdbf/0x2220 arch/x86/kernel/unwind_orc.c:547 arch_stack_walk+0x10d/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x113/0x1c0 kernel/stacktrace.c:122 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486 call_rcu+0x163/0xa10 kernel/rcu/tree.c:2844 __dentry_kill+0x4f4/0x650 fs/dcache.c:621 dentry_kill+0xbb/0x290 dput+0xfb/0x1d0 fs/dcache.c:914 proc_invalidate_siblings_dcache+0x3ff/0x6e0 fs/proc/inode.c:149 release_task+0x1553/0x16d0 kernel/exit.c:278 wait_task_zombie kernel/exit.c:1205 [inline] wait_consider_task+0x1a64/0x2e90 kernel/exit.c:1432 do_wait_thread kernel/exit.c:1495 [inline] do_wait+0x32b/0xb80 kernel/exit.c:1612 kernel_wait4+0x29e/0x3e0 kernel/exit.c:1775 __do_sys_wait4 kernel/exit.c:1803 [inline] __se_sys_wait4 kernel/exit.c:1799 [inline] __x64_sys_wait4+0x130/0x1e0 kernel/exit.c:1799 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 INITIAL USE at: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:178 sock_hash_free+0x160/0x820 net/core/sock_map.c:1149 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:307 } ... key at: [] sock_hash_alloc.__key+0x0/0x20 ... acquired at: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:178 sock_hash_delete_elem+0xac/0x2f0 net/core/sock_map.c:932 bpf_prog_a8aaa52f2e199321+0x42/0x46 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 __bpf_trace_mm_page_alloc+0xba/0xe0 include/trace/events/kmem.h:177 __traceiter_mm_page_alloc+0x35/0x50 include/trace/events/kmem.h:177 trace_mm_page_alloc include/trace/events/kmem.h:177 [inline] __alloc_pages+0x717/0x770 mm/page_alloc.c:5569 __stack_depot_save+0x372/0x470 lib/stackdepot.c:474 save_stack+0x104/0x1e0 mm/page_owner.c:128 __set_page_owner+0x26/0x390 mm/page_owner.c:190 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513 prep_new_page mm/page_alloc.c:2520 [inline] get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5547 __stack_depot_save+0x372/0x470 lib/stackdepot.c:474 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x60/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x10c/0x2d0 mm/slub.c:3422 kmem_cache_zalloc include/linux/slab.h:682 [inline] fill_pool lib/debugobjects.c:168 [inline] debug_objects_fill_pool+0x5fc/0xa10 lib/debugobjects.c:606 debug_object_activate+0x32/0x4e0 lib/debugobjects.c:693 debug_timer_activate kernel/time/timer.c:782 [inline] __mod_timer+0x7bf/0xee0 kernel/time/timer.c:1103 schedule_timeout+0x1b4/0x300 kernel/time/timer.c:1964 synchronize_rcu_expedited_wait_once kernel/rcu/tree_exp.h:580 [inline] synchronize_rcu_expedited_wait kernel/rcu/tree_exp.h:631 [inline] rcu_exp_wait_wake kernel/rcu/tree_exp.h:699 [inline] rcu_exp_sel_wait_wake+0x764/0x1d50 kernel/rcu/tree_exp.h:733 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:307 stack backtrace: CPU: 1 PID: 22 Comm: kworker/1:0 Not tainted 6.1.84-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: rcu_gp wait_rcu_exp_gp Call Trace: __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:2604 [inline] check_irq_usage kernel/locking/lockdep.c:2843 [inline] check_prev_add kernel/locking/lockdep.c:3094 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x4d16/0x5950 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_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:178 sock_hash_delete_elem+0xac/0x2f0 net/core/sock_map.c:932 bpf_prog_a8aaa52f2e199321+0x42/0x46 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 __bpf_trace_mm_page_alloc+0xba/0xe0 include/trace/events/kmem.h:177 __traceiter_mm_page_alloc+0x35/0x50 include/trace/events/kmem.h:177 trace_mm_page_alloc include/trace/events/kmem.h:177 [inline] __alloc_pages+0x717/0x770 mm/page_alloc.c:5569 __stack_depot_save+0x372/0x470 lib/stackdepot.c:474 save_stack+0x104/0x1e0 mm/page_owner.c:128 __set_page_owner+0x26/0x390 mm/page_owner.c:190 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513 prep_new_page mm/page_alloc.c:2520 [inline] get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5547 __stack_depot_save+0x372/0x470 lib/stackdepot.c:474 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x60/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x10c/0x2d0 mm/slub.c:3422 kmem_cache_zalloc include/linux/slab.h:682 [inline] fill_pool lib/debugobjects.c:168 [inline] debug_objects_fill_pool+0x5fc/0xa10 lib/debugobjects.c:606 debug_object_activate+0x32/0x4e0 lib/debugobjects.c:693 debug_timer_activate kernel/time/timer.c:782 [inline] __mod_timer+0x7bf/0xee0 kernel/time/timer.c:1103 schedule_timeout+0x1b4/0x300 kernel/time/timer.c:1964 synchronize_rcu_expedited_wait_once kernel/rcu/tree_exp.h:580 [inline] synchronize_rcu_expedited_wait kernel/rcu/tree_exp.h:631 [inline] rcu_exp_wait_wake kernel/rcu/tree_exp.h:699 [inline] rcu_exp_sel_wait_wake+0x764/0x1d50 kernel/rcu/tree_exp.h:733 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:307 ------------[ cut here ]------------ raw_local_irq_restore() called with IRQs enabled WARNING: CPU: 1 PID: 22 at kernel/locking/irqflag-debug.c:10 warn_bogus_irq_restore+0x1d/0x20 kernel/locking/irqflag-debug.c:10 Modules linked in: CPU: 1 PID: 22 Comm: kworker/1:0 Not tainted 6.1.84-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: rcu_gp wait_rcu_exp_gp RIP: 0010:warn_bogus_irq_restore+0x1d/0x20 kernel/locking/irqflag-debug.c:10 Code: 24 48 c7 c7 00 bc ea 8a e8 6c f5 fd ff 80 3d 2f 5b d5 03 00 74 01 c3 c6 05 25 5b d5 03 01 48 c7 c7 60 e6 eb 8a e8 23 64 c8 f6 <0f> 0b c3 41 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 RSP: 0018:ffffc900001c7818 EFLAGS: 00010246 RAX: c9d82a9f70544000 RBX: 1ffff92000038f08 RCX: ffff88801274bb80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900001c78b0 R08: ffffffff81527eae R09: fffff52000038e65 R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: 1ffff92000038f04 R14: ffffc900001c7840 R15: 0000000000000246 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555555755ca8 CR3: 0000000072d98000 CR4: 00000000003506e0 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+0x118/0x130 kernel/locking/spinlock.c:194 __mod_timer+0x956/0xee0 kernel/time/timer.c:1118 schedule_timeout+0x1b4/0x300 kernel/time/timer.c:1964 synchronize_rcu_expedited_wait_once kernel/rcu/tree_exp.h:580 [inline] synchronize_rcu_expedited_wait kernel/rcu/tree_exp.h:631 [inline] rcu_exp_wait_wake kernel/rcu/tree_exp.h:699 [inline] rcu_exp_sel_wait_wake+0x764/0x1d50 kernel/rcu/tree_exp.h:733 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:307