rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 GPs behind) idle=ecc4/1/0x4000000000000000 softirq=9845/9846 fqs=0 rcu: (t=10501 jiffies g=10673 q=1093 ncpus=2) rcu: rcu_preempt kthread starved for 10502 jiffies! g10673 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:28320 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0xee1/0x59f0 kernel/sched/core.c:6710 schedule+0xe7/0x1b0 kernel/sched/core.c:6786 schedule_timeout+0x157/0x2c0 kernel/time/timer.c:2167 rcu_gp_fqs_loop+0x1ec/0xa50 kernel/rcu/tree.c:1609 rcu_gp_kthread+0x249/0x380 kernel/rcu/tree.c:1808 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296 RIP: 0000:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0000:0000000000000000 EFLAGS: 00000000 ORIG_RAX: 0000000000000000 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 7 Comm: kworker/0:0 Not tainted 6.5.0-rc3-syzkaller-00231-g3932f2272313 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Workqueue: mld mld_dad_work RIP: 0010:write_comp_data+0xc/0x90 kernel/kcov.c:230 Code: 00 75 10 65 48 8b 04 25 80 b9 03 00 48 8b 80 f8 15 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 65 8b 05 11 4e 7d 7e 49 89 f1 89 c6 <49> 89 d2 81 e6 00 01 00 00 49 89 f8 65 48 8b 14 25 80 b9 03 00 a9 RSP: 0018:ffffc90000007bc8 EFLAGS: 00000202 RAX: 0000000000000102 RBX: 000000002af31dc4 RCX: ffffffff88587686 RDX: 00004189374bc6a7 RSI: 0000000000000102 RDI: 0000000000000006 RBP: 00004189374bc6a7 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 000000000000004e R12: 00000000000003e8 R13: 0000000000000005 R14: 00000000044b82fa R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000080 CR3: 00000000720f0000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pie_calculate_probability+0x296/0x850 net/sched/sch_pie.c:345 fq_pie_timer+0x1da/0x4f0 net/sched/sch_fq_pie.c:387 call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x764/0xb10 kernel/time/timer.c:2022 run_timer_softirq+0x58/0xd0 kernel/time/timer.c:2035 __do_softirq+0x218/0x965 kernel/softirq.c:553 do_softirq kernel/softirq.c:454 [inline] do_softirq+0xaa/0xe0 kernel/softirq.c:441 __local_bh_enable_ip+0xf8/0x120 kernel/softirq.c:381 spin_unlock_bh include/linux/spinlock.h:396 [inline] rt6_uncached_list_add net/ipv6/route.c:146 [inline] icmp6_dst_alloc+0x422/0x620 net/ipv6/route.c:3279 mld_sendpack+0x5f9/0xd60 net/ipv6/mcast.c:1809 mld_send_initial_cr.part.0+0x1a1/0x260 net/ipv6/mcast.c:2239 mld_send_initial_cr net/ipv6/mcast.c:2227 [inline] mld_dad_work+0x57/0x2e0 net/ipv6/mcast.c:2262 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597 worker_thread+0x687/0x1110 kernel/workqueue.c:2748 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296 RIP: 0000:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0000:0000000000000000 EFLAGS: 00000000 ORIG_RAX: 0000000000000000 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 CPU: 1 PID: 5110 Comm: syz-executor633 Not tainted 6.5.0-rc3-syzkaller-00231-g3932f2272313 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 RIP: 0010:fq_pie_timer+0x1ce/0x4f0 net/sched/sch_fq_pie.c:386 Code: 75 80 48 8d 7e 44 48 89 f8 48 c1 e8 03 42 0f b6 14 20 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 ba 02 00 00 8b 56 44 <83> c3 01 48 8b 3c 24 e8 a6 a8 ff ff 48 8b 44 24 08 42 0f b6 04 20 RSP: 0018:ffffc900001e0c40 EFLAGS: 00000246 RAX: 0000000000000007 RBX: 0000000000001c6e RCX: 0000000000000100 RDX: 0000000000000000 RSI: ffffc900124c7020 RDI: ffffc900124c7064 RBP: ffff888024624b50 R08: 0000000000000004 R09: 000000000000d85a R10: 0000000000001c6e R11: 00000000ce66f7fc R12: dffffc0000000000 R13: 0000000000000007 R14: ffffed10048c495a R15: 000000000000d85a FS: 00005555557ae480(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 000000006bbd5000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x764/0xb10 kernel/time/timer.c:2022 run_timer_softirq+0x58/0xd0 kernel/time/timer.c:2035 __do_softirq+0x218/0x965 kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu kernel/softirq.c:632 [inline] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1109 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:clear_page_erms+0xd/0x10 arch/x86/lib/clear_page_64.S:51 Code: 47 20 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d9 90 c3 0f 1f 80 00 00 00 00 f3 0f 1e fa b9 00 10 00 00 31 c0 f3 aa 66 90 f3 0f 1e fa 48 83 f9 40 73 36 83 f9 08 73 0f 85 c9 74 0a RSP: 0018:ffffc90003e6ef28 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000009 RCX: 0000000000000000 RDX: ffffea0001a6f6c0 RSI: ffff888000000000 RDI: ffff888069bdc000 RBP: ffffea0001a68000 R08: 0000160000000000 R09: 0000000000000000 R10: ffffed100d340000 R11: dffffc0000000000 R12: 0000000000000000 R13: ffffea0001a70000 R14: 0000000000000001 R15: 0000000000000000 clear_page arch/x86/include/asm/page_64.h:53 [inline] clear_highpage_kasan_tagged include/linux/highmem.h:248 [inline] kernel_init_pages mm/page_alloc.c:1096 [inline] post_alloc_hook+0x1a3/0x350 mm/page_alloc.c:1568 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0x10a9/0x31e0 mm/page_alloc.c:3221 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4477 alloc_pages+0x1a9/0x270 mm/mempolicy.c:2279 vm_area_alloc_pages mm/vmalloc.c:3059 [inline] __vmalloc_area_node mm/vmalloc.c:3135 [inline] __vmalloc_node_range+0xa6e/0x1540 mm/vmalloc.c:3316 kvmalloc_node+0x14b/0x1a0 mm/util.c:629 kvmalloc include/linux/slab.h:720 [inline] kvmalloc_array include/linux/slab.h:738 [inline] kvcalloc include/linux/slab.h:743 [inline] fq_pie_init+0x555/0x8f0 net/sched/sch_fq_pie.c:429 qdisc_create+0x4f7/0x10a0 net/sched/sch_api.c:1326 tc_modify_qdisc+0x4a4/0x1bf0 net/sched/sch_api.c:1720 rtnetlink_rcv_msg+0x439/0xd30 net/core/rtnetlink.c:6428 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2549 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x539/0x800 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x93c/0xe30 net/netlink/af_netlink.c:1914 sock_sendmsg_nosec net/socket.c:725 [inline] sock_sendmsg+0xd9/0x180 net/socket.c:748 ____sys_sendmsg+0x6ac/0x940 net/socket.c:2494 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2548 __sys_sendmsg+0x117/0x1e0 net/socket.c:2577 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7efdd7ec41e9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 1d 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd842a8a48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007efdd7ec41e9 RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000003 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd842a8a78 R13: 00007ffd842a8a90 R14: 00007ffd842a8ad0 R15: 0000000000000001