===================================================== WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected 5.15.153-syzkaller #0 Not tainted ----------------------------------------------------- syz-executor.2/8594 [HC0[0]:SC0[2]:HE0:SE0] is trying to acquire: ffff88807ddb0020 (&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 cpu_select_mitigations+0x38/0x8f arch/x86/kernel/cpu/bugs.c:150 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_update_common+0x20c/0xa30 net/core/sock_map.c:1005 sock_map_update_elem_sys+0x485/0x770 net/core/sock_map.c:587 map_update_elem+0x6a0/0x7c0 kernel/bpf/syscall.c:1185 __sys_bpf+0x2fd/0x670 kernel/bpf/syscall.c:4639 __do_sys_bpf kernel/bpf/syscall.c:4755 [inline] __se_sys_bpf kernel/bpf/syscall.c:4753 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4753 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb 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); lock(&rq->__lock ); *** DEADLOCK *** 5 locks held by syz-executor.2/8594: #0: ffff88807c9bf270 (&f->f_pos_lock ){+.+.}-{3:3} , at: __fdget_pos+0x2cb/0x380 fs/file.c:1088 #1: ffff88814abd4460 (sb_writers #5 ){.+.+}-{0:0} , at: vfs_write+0x29a/0xe50 fs/read_write.c:590 #2: ffff888062dfd3b0 (&sb->s_type->i_mutex_key #9){++++}-{3:3} , at: inode_lock include/linux/fs.h:789 [inline] , at: ext4_buffered_write_iter+0xa0/0x360 fs/ext4/file.c:262 #3: ffff8880b9a3a318 (&rq->__lock ){-.-.}-{2:2} , at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475 #4: 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 cpu_select_mitigations+0x38/0x8f arch/x86/kernel/cpu/bugs.c:150 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: [] 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_update_common+0x20c/0xa30 net/core/sock_map.c:1005 sock_map_update_elem_sys+0x485/0x770 net/core/sock_map.c:587 map_update_elem+0x6a0/0x7c0 kernel/bpf/syscall.c:1185 __sys_bpf+0x2fd/0x670 kernel/bpf/syscall.c:4639 __do_sys_bpf kernel/bpf/syscall.c:4755 [inline] __se_sys_bpf kernel/bpf/syscall.c:4753 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4753 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb 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_update_common+0x20c/0xa30 net/core/sock_map.c:1005 sock_map_update_elem_sys+0x485/0x770 net/core/sock_map.c:587 map_update_elem+0x6a0/0x7c0 kernel/bpf/syscall.c:1185 __sys_bpf+0x2fd/0x670 kernel/bpf/syscall.c:4639 __do_sys_bpf kernel/bpf/syscall.c:4755 [inline] __se_sys_bpf kernel/bpf/syscall.c:4753 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4753 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb } ... key at: [] 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_2c29ac5cdc6b1842+0x3a/0x848 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_run2+0x19e/0x340 kernel/trace/bpf_trace.c:1917 trace_tlb_flush+0xed/0x110 include/trace/events/tlb.h:38 switch_mm_irqs_off+0x748/0xa30 context_switch kernel/sched/core.c:5016 [inline] __schedule+0x1167/0x45b0 kernel/sched/core.c:6376 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6780 irqentry_exit+0x53/0x80 kernel/entry/common.c:426 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638 lock_release+0x62d/0x9a0 kernel/locking/lockdep.c:5647 rcu_read_unlock include/linux/rcupdate.h:772 [inline] percpu_ref_get_many include/linux/percpu-refcount.h:209 [inline] percpu_ref_get include/linux/percpu-refcount.h:222 [inline] obj_cgroup_get include/linux/memcontrol.h:805 [inline] memcg_slab_post_alloc_hook mm/slab.h:320 [inline] slab_post_alloc_hook+0x24a/0x380 mm/slab.h:526 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0xf3/0x280 mm/slub.c:3233 kmem_cache_zalloc include/linux/slab.h:711 [inline] alloc_buffer_head+0x20/0xf0 fs/buffer.c:3311 alloc_page_buffers+0x3a3/0x660 fs/buffer.c:832 create_empty_buffers+0x3a/0x6d0 fs/buffer.c:1562 ext4_block_write_begin+0x341/0x13a0 fs/ext4/inode.c:1059 ext4_da_write_begin+0x5c5/0xb60 fs/ext4/inode.c:2988 generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3785 ext4_buffered_write_iter+0x227/0x360 fs/ext4/file.c:268 ext4_file_write_iter+0x87c/0x1990 call_write_iter include/linux/fs.h:2148 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0xacf/0xe50 fs/read_write.c:594 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb stack backtrace: CPU: 0 PID: 8594 Comm: syz-executor.2 Not tainted 5.15.153-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 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: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_2c29ac5cdc6b1842+0x3a/0x848 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_run2+0x19e/0x340 kernel/trace/bpf_trace.c:1917 trace_tlb_flush+0xed/0x110 include/trace/events/tlb.h:38 switch_mm_irqs_off+0x748/0xa30 context_switch kernel/sched/core.c:5016 [inline] __schedule+0x1167/0x45b0 kernel/sched/core.c:6376 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6780 irqentry_exit+0x53/0x80 kernel/entry/common.c:426 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:lock_release+0x62d/0x9a0 kernel/locking/lockdep.c:5647 Code: 3c 3b 00 74 08 4c 89 f7 e8 20 41 67 00 f6 84 24 91 00 00 00 02 75 6f 41 f7 c5 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 27 00 00 00 00 4b c7 44 27 08 00 00 00 00 65 48 8b 04 25 RSP: 0018:ffffc90002ed7440 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff920005dae9a RCX: ffffc90002ed7403 RDX: 0000000000000003 RSI: ffffffff8a8b27a0 RDI: ffffffff8ad88fc0 RBP: ffffc90002ed7568 R08: dffffc0000000000 R09: fffffbfff1bc72a6 R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920005dae94 R13: 0000000000000246 R14: ffffc90002ed74d0 R15: dffffc0000000000 rcu_read_unlock include/linux/rcupdate.h:772 [inline] percpu_ref_get_many include/linux/percpu-refcount.h:209 [inline] percpu_ref_get include/linux/percpu-refcount.h:222 [inline] obj_cgroup_get include/linux/memcontrol.h:805 [inline] memcg_slab_post_alloc_hook mm/slab.h:320 [inline] slab_post_alloc_hook+0x24a/0x380 mm/slab.h:526 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0xf3/0x280 mm/slub.c:3233 kmem_cache_zalloc include/linux/slab.h:711 [inline] alloc_buffer_head+0x20/0xf0 fs/buffer.c:3311 alloc_page_buffers+0x3a3/0x660 fs/buffer.c:832 create_empty_buffers+0x3a/0x6d0 fs/buffer.c:1562 ext4_block_write_begin+0x341/0x13a0 fs/ext4/inode.c:1059 ext4_da_write_begin+0x5c5/0xb60 fs/ext4/inode.c:2988 generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3785 ext4_buffered_write_iter+0x227/0x360 fs/ext4/file.c:268 ext4_file_write_iter+0x87c/0x1990 call_write_iter include/linux/fs.h:2148 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0xacf/0xe50 fs/read_write.c:594 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fd20eb75e69 Code: Unable to access opcode bytes at RIP 0x7fd20eb75e3f. RSP: 002b:00007fd20d0e80c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fd20eca3f80 RCX: 00007fd20eb75e69 RDX: 000000000208e24b RSI: 0000000020000340 RDI: 0000000000000005 RBP: 00007fd20ebc247a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fd20eca3f80 R15: 00007ffd3f02ae88 ---------------- Code disassembly (best guess): 0: 3c 3b cmp $0x3b,%al 2: 00 74 08 4c add %dh,0x4c(%rax,%rcx,1) 6: 89 f7 mov %esi,%edi 8: e8 20 41 67 00 call 0x67412d d: f6 84 24 91 00 00 00 testb $0x2,0x91(%rsp) 14: 02 15: 75 6f jne 0x86 17: 41 f7 c5 00 02 00 00 test $0x200,%r13d 1e: 74 01 je 0x21 20: fb sti 21: 48 c7 44 24 60 0e 36 movq $0x45e0360e,0x60(%rsp) 28: e0 45 * 2a: 4b c7 04 27 00 00 00 movq $0x0,(%r15,%r12,1) <-- trapping instruction 31: 00 32: 4b c7 44 27 08 00 00 movq $0x0,0x8(%r15,%r12,1) 39: 00 00 3b: 65 gs 3c: 48 rex.W 3d: 8b .byte 0x8b 3e: 04 25 add $0x25,%al