net_ratelimit: 4 callbacks suppressed GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (0 ticks this GP) idle=e4fc/1/0x4000000000000000 softirq=20632/20632 fqs=47 rcu: (detected by 0, t=10502 jiffies, g=28025, q=628 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 7986 Comm: syz.2.1172 Not tainted 6.11.0-rc7-syzkaller-00135-gb7718454f937 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:instrument_atomic_read include/linux/instrumented.h:68 [inline] RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] RIP: 0010:__lock_acquire+0xc81/0x2040 kernel/locking/lockdep.c:5112 Code: 04 38 84 c0 0f 85 df 0c 00 00 83 3d c8 fa 9f 18 00 75 39 48 63 9c 24 88 00 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 40 68 fa 93 08 00 00 00 e8 65 d3 87 00 48 bf 00 00 00 00 00 fc ff df 48 0f RSP: 0018:ffffc90000a187f0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff9a0fd903 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff93fa6840 RBP: ffff888070e7c730 R08: ffffffff93fa6847 R09: 1ffffffff27f4d08 R10: dffffc0000000000 R11: fffffbfff27f4d09 R12: ffff888070e7bc00 R13: ffff888070e7c6d8 R14: 0000000000000000 R15: ffff888070e7c750 FS: 00007f79905ed6c0(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b3221dff8 CR3: 0000000070a60000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 debug_objects_fill_pool+0x9f/0x9b0 lib/debugobjects.c:615 debug_object_activate+0x135/0x510 lib/debugobjects.c:705 debug_hrtimer_activate kernel/time/hrtimer.c:423 [inline] debug_activate kernel/time/hrtimer.c:478 [inline] enqueue_hrtimer+0x30/0x3c0 kernel/time/hrtimer.c:1085 __run_hrtimer kernel/time/hrtimer.c:1706 [inline] __hrtimer_run_queues+0x6cb/0xd50 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x110/0x3f0 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 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194 Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 ce 7b 3c f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 83 cc a7 f5 65 8b 05 64 a2 48 74 85 c0 74 43 48 c7 04 24 0e 36 RSP: 0018:ffffc90015ac7a60 EFLAGS: 00000206 RAX: 2405abb9d2f0b200 RBX: 1ffff92002b58f50 RCX: ffffffff81703f9a RDX: dffffc0000000000 RSI: ffffffff8bead560 RDI: 0000000000000001 RBP: ffffc90015ac7af0 R08: ffffffff93fa694f R09: 1ffffffff27f4d29 R10: dffffc0000000000 R11: fffffbfff27f4d2a R12: dffffc0000000000 R13: 1ffff92002b58f4c R14: ffffc90015ac7a80 R15: 0000000000000246 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] __wake_up_common_lock+0x18c/0x1e0 kernel/sched/wait.c:108 io_cqring_wake io_uring/io_uring.h:274 [inline] io_cq_unlock_post io_uring/io_uring.c:595 [inline] __io_cqring_overflow_flush+0x504/0x690 io_uring/io_uring.c:633 io_cqring_do_overflow_flush io_uring/io_uring.c:645 [inline] io_cqring_wait io_uring/io_uring.c:2486 [inline] __do_sys_io_uring_enter io_uring/io_uring.c:3255 [inline] __se_sys_io_uring_enter+0x1c36/0x2670 io_uring/io_uring.c:3147 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f798f77def9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f79905ed038 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007f798f935f80 RCX: 00007f798f77def9 RDX: 0000000000400000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f798f7f0b76 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f798f935f80 R15: 00007ffcb1cba788 rcu: rcu_preempt kthread starved for 10407 jiffies! g28025 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:26448 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6621 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2034 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2236 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 UID: 0 PID: 9304 Comm: syz.1.1755 Not tainted 6.11.0-rc7-syzkaller-00135-gb7718454f937 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:csd_lock_wait kernel/smp.c:312 [inline] RIP: 0010:smp_call_function_many_cond+0x1865/0x29d0 kernel/smp.c:856 Code: 89 e6 83 e6 01 31 ff e8 39 18 0c 00 41 83 e4 01 49 bc 00 00 00 00 00 fc ff df 75 07 e8 e4 13 0c 00 eb 38 f3 90 42 0f b6 04 23 <84> c0 75 11 41 f7 45 00 01 00 00 00 74 1e e8 c8 13 0c 00 eb e4 44 RSP: 0018:ffffc900031072a0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 1ffff110171288e9 RCX: 0000000000040000 RDX: ffffc90008c41000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc90003107480 R08: ffffffff81877867 R09: 1ffffffff27f4d08 R10: dffffc0000000000 R11: fffffbfff27f4d09 R12: dffffc0000000000 R13: ffff8880b8944748 R14: ffff8880b883fb00 R15: 0000000000000001 FS: 00007fd4fc3956c0(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31f1cff8 CR3: 0000000077ffc000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1023 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2085 [inline] text_poke_bp_batch+0x352/0xb30 arch/x86/kernel/alternative.c:2295 text_poke_bp+0xb0/0x100 arch/x86/kernel/alternative.c:2522 __static_call_transform+0x51a/0x810 arch/x86/kernel/static_call.c:111 arch_static_call_transform+0x141/0x380 arch/x86/kernel/static_call.c:163 __static_call_update+0xd8/0x5e0 kernel/static_call_inline.c:147 bpf_dispatcher_update kernel/bpf/dispatcher.c:126 [inline] bpf_dispatcher_change_prog+0xe5f/0xf10 kernel/bpf/dispatcher.c:167 bpf_prog_test_run_xdp+0x75c/0x11b0 net/bpf/test_run.c:1314 bpf_prog_test_run+0x33a/0x3b0 kernel/bpf/syscall.c:4313 __sys_bpf+0x48d/0x810 kernel/bpf/syscall.c:5728 __do_sys_bpf kernel/bpf/syscall.c:5817 [inline] __se_sys_bpf kernel/bpf/syscall.c:5815 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5815 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd4fb57def9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd4fc395038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fd4fb735f80 RCX: 00007fd4fb57def9 RDX: 0000000000000048 RSI: 0000000020000600 RDI: 000000000000000a RBP: 00007fd4fb5f0b76 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fd4fb735f80 R15: 00007fffda15cb08