rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=0d7c/1/0x4000000000000000 softirq=69673/69690 fqs=0 rcu: (detected by 1, t=10505 jiffies, g=59057, q=301 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 15131 Comm: syz-executor Not tainted 6.13.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:check_preemption_disabled+0x27/0x120 lib/smp_processor_id.c:16 Code: 90 90 90 41 57 41 56 41 54 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 65 8b 1d 8c ec 42 74 65 8b 05 81 ec 42 74 ff ff ff 7f 74 26 65 48 8b 04 25 28 00 00 00 48 3b 44 24 08 0f RSP: 0018:ffffc90000007bf0 EFLAGS: 00000086 RAX: 0000000080010001 RBX: 0000000000000000 RCX: ffff888029f83c00 RDX: ffff888029f83c00 RSI: ffffffff8c0aaa40 RDI: ffffffff8c5edca0 RBP: 0000000000000001 R08: ffffffff89c5d3eb R09: fffff52000000f7c R10: dffffc0000000000 R11: fffff52000000f7c R12: 0000000000000046 R13: ffff888029f83c00 R14: 00000000ffffffff R15: ffff88805ace1300 FS: 000055558720b500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f81cff8 CR3: 00000000672f2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline] lock_is_held_type+0x101/0x190 kernel/locking/lockdep.c:5922 lock_is_held include/linux/lockdep.h:249 [inline] advance_sched+0x1c2/0xca0 net/sched/sch_taprio.c:929 __run_hrtimer kernel/time/hrtimer.c:1739 [inline] __hrtimer_run_queues+0x59b/0xd30 kernel/time/hrtimer.c:1803 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1865 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:list_empty include/linux/list.h:373 [inline] RIP: 0010:netlink_deliver_tap+0xe8/0x1b0 net/netlink/af_netlink.c:337 Code: c7 c2 20 94 0f 8d e8 07 7a ae f7 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 e8 b4 36 f8 <48> 8b 03 48 39 d8 0f 85 99 00 00 00 e8 17 d8 d2 f7 e8 f2 35 f4 01 RSP: 0018:ffffc90004f8f748 EFLAGS: 00000246 RAX: 1ffff1100d007540 RBX: ffff88806803aa00 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff8c5edc80 RDI: ffffffff8c5edc40 RBP: 0000000000000001 R08: ffffffff89cc9adf R09: 1ffffffff284e310 R10: dffffc0000000000 R11: fffffbfff284e311 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff88803374ddc0 R15: ffffffff89cc9aae __netlink_sendskb net/netlink/af_netlink.c:1265 [inline] netlink_sendskb+0x68/0x140 net/netlink/af_netlink.c:1274 netlink_unicast+0x39d/0x990 net/netlink/af_netlink.c:1362 netlink_rcv_skb+0x262/0x430 net/netlink/af_netlink.c:2548 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1347 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1891 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:726 __sys_sendto+0x363/0x4c0 net/socket.c:2197 __do_sys_sendto net/socket.c:2204 [inline] __se_sys_sendto net/socket.c:2200 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2200 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: 0033:0x7f8b0a787bbc Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b RSP: 002b:00007fffeeca4210 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f8b0b4a4620 RCX: 00007f8b0a787bbc RDX: 0000000000000040 RSI: 00007f8b0b4a4670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007fffeeca4264 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f8b0b4a4670 R15: 0000000000000000 rcu: rcu_preempt kthread starved for 10505 jiffies! g59057 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 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:26264 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x17fb/0x4be0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247 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: 1 UID: 0 PID: 15401 Comm: syz.6.2158 Not tainted 6.13.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:memcmp lib/string.c:687 [inline] RIP: 0010:bcmp+0x169/0x1e0 lib/string.c:708 Code: 48 89 d5 e8 39 ea 46 f6 48 8b 34 24 48 89 ea e9 2f ff ff ff 4d 85 f6 74 6c 31 ed 49 8d 3c 2c 48 89 f8 48 c1 e8 03 0f b6 04 10 <84> c0 75 2b 41 0f b6 1c 2c 49 8d 3c 2f 48 89 f8 48 c1 e8 03 0f b6 RSP: 0018:ffffc90000a186e0 EFLAGS: 00000a02 RAX: 0000000000000000 RBX: ffff88806362a15a RCX: dffffc0000000000 RDX: dffffc0000000000 RSI: ffff88806362a15a RDI: ffff8880248ac040 RBP: 0000000000000000 R08: ffffffff8b2a6c20 R09: ffffffff84ba14f5 R10: 000000000000000c R11: 0000000000000000 R12: ffff8880248ac040 R13: ffff8880248ac040 R14: 0000000000000006 R15: ffff88806362a15a FS: 00007fb087ce26c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f819ff8 CR3: 0000000069f72000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rhashtable_compare include/linux/rhashtable.h:585 [inline] __rhashtable_lookup include/linux/rhashtable.h:610 [inline] rhltable_lookup+0x46b/0x810 include/linux/rhashtable.h:696 sta_info_hash_lookup net/mac80211/sta_info.c:200 [inline] sta_info_get_bss+0x128/0x320 net/mac80211/sta_info.c:237 ieee80211_rx_for_interface+0x102/0x3d0 net/mac80211/rx.c:5170 __ieee80211_rx_handle_packet net/mac80211/rx.c:5334 [inline] ieee80211_rx_list+0x2df4/0x3810 net/mac80211/rx.c:5469 ieee80211_rx_napi+0x18a/0x3c0 net/mac80211/rx.c:5492 ieee80211_rx include/net/mac80211.h:5166 [inline] ieee80211_handle_queued_frames+0xe7/0x1e0 net/mac80211/main.c:441 tasklet_action_common+0x426/0x620 kernel/softirq.c:811 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0x19f8/0x2c60 kernel/smp.c:884 Code: 89 e6 83 e6 01 31 ff e8 56 e9 0b 00 41 83 e4 01 49 bc 00 00 00 00 00 fc ff df 75 07 e8 01 e5 0b 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 e5 e4 0b 00 eb e4 44 RSP: 0018:ffffc90004b9f980 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 1ffff110170c8c65 RCX: 0000000000080000 RDX: ffffc9001dc03000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc90004b9fb80 R08: ffffffff81938e7a R09: 1ffffffff284e310 R10: dffffc0000000000 R11: fffffbfff284e311 R12: dffffc0000000000 R13: ffff8880b8646328 R14: ffff8880b873f940 R15: 0000000000000000 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1051 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2114 [inline] text_poke_bp_batch+0x352/0xb30 arch/x86/kernel/alternative.c:2324 text_poke_flush arch/x86/kernel/alternative.c:2515 [inline] text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2522 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_slow_inc_cpuslocked+0x80/0xf0 kernel/jump_label.c:168 static_key_slow_inc+0x1a/0x30 kernel/jump_label.c:191 io_uring_create+0xf2/0xc00 io_uring/io_uring.c:3646 io_uring_setup io_uring/io_uring.c:3811 [inline] __do_sys_io_uring_setup io_uring/io_uring.c:3838 [inline] __se_sys_io_uring_setup+0x2ba/0x330 io_uring/io_uring.c:3832 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: 0033:0x7fb086f85d29 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:00007fb087ce1fc8 EFLAGS: 00000202 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 00007fb087175fa0 RCX: 00007fb086f85d29 RDX: 0000000020000200 RSI: 00000000200002c0 RDI: 0000000000000ad5 RBP: 00000000200002c0 R08: 0000000000000000 R09: 0000000020000200 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000020000080 R14: 0000000000000ad5 R15: 0000000020000200