rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=2e4c/1/0x4000000000000000 softirq=318661/318665 fqs=0
rcu: (detected by 0, t=10506 jiffies, g=410293, q=194 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11514 Comm: syz.3.10990 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:kasan_check_range+0x1ca/0x2c0 mm/kasan/generic.c:200
Code: dc 4d 01 f3 49 8d 5c 24 07 4d 85 e4 49 0f 49 dc 48 83 e3 f8 49 29 dc 74 0e 41 80 3b 00 75 7c 49 ff c3 49 ff cc 75 f2 5b 41 5c <41> 5d 41 5e 41 5f 5d e9 da 6b 87 09 cc 45 84 ff 0f 85 a1 00 00 00
RSP: 0018:ffffc90000a08d60 EFLAGS: 00000056
RAX: 0000000000000001 RBX: ffffffff9a6b5388 RCX: ffffffff81a1bded
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff9a6b5388
RBP: ffff8880216a8300 R08: ffffffff9a6b538b R09: 1ffffffff34d6a71
R10: dffffc0000000000 R11: fffffbfff34d6a72 R12: dffffc0000000000
R13: ffff8880b8728410 R14: fffffbfff34d6a72 R15: 1ffffffff34d6a71
FS: 00007fa1f0aab6c0(0000) GS:ffff888125331000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000012c0 CR3: 000000007d2b6000 CR4: 00000000003526f0
Call Trace:
instrument_atomic_read include/linux/instrumented.h:82 [inline]
atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
queued_spin_is_locked include/asm-generic/qspinlock.h:57 [inline]
debug_spin_unlock kernel/locking/spinlock_debug.c:101 [inline]
do_raw_spin_unlock+0x4d/0x210 kernel/locking/spinlock_debug.c:141
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:177 [inline]
_raw_spin_unlock_irqrestore+0x23/0x80 kernel/locking/spinlock.c:198
debug_hrtimer_deactivate kernel/time/hrtimer.c:490 [inline]
__run_hrtimer kernel/time/hrtimer.c:1898 [inline]
__hrtimer_run_queues+0x23a/0xa20 kernel/time/hrtimer.c:1994
hrtimer_interrupt+0x44b/0x950 kernel/time/hrtimer.c:2113
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
__sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198
Code: f7 e8 ad 10 eb f5 f7 c3 00 02 00 00 74 05 e8 30 89 16 f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 f4 92 dc f5 65 8b 05 0d 43 88 07 85 c0 74 18 5b 41 5e c3 cc cc
RSP: 0018:ffffc90006fceee8 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000282 RCX: 0000000000000202
RDX: 0000000000000002 RSI: ffffffff8dfcbe82 RDI: 0000000000000001
RBP: ffffc90006fcf1d0 R08: ffffffff9032f3b7 R09: 1ffffffff2065e76
R10: dffffc0000000000 R11: fffffbfff2065e77 R12: ffff8880216a8290
R13: dffffc0000000000 R14: ffff8880216a82a8 R15: ffff8880216a82f8
spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
taprio_change+0x30fe/0x3e50 net/sched/sch_taprio.c:1985
taprio_init+0x96f/0xbe0 net/sched/sch_taprio.c:2124
qdisc_create+0x7c4/0xf20 net/sched/sch_api.c:1319
__tc_modify_qdisc net/sched/sch_api.c:1753 [inline]
tc_modify_qdisc+0x16f0/0x2290 net/sched/sch_api.c:1817
rtnetlink_rcv_msg+0x77e/0xbe0 net/core/rtnetlink.c:7003
netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x75c/0x8e0 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:787 [inline]
__sock_sendmsg net/socket.c:802 [inline]
____sys_sendmsg+0x972/0x9f0 net/socket.c:2698
___sys_sendmsg+0x2a5/0x360 net/socket.c:2752
__sys_sendmsg net/socket.c:2784 [inline]
__do_sys_sendmsg net/socket.c:2789 [inline]
__se_sys_sendmsg net/socket.c:2787 [inline]
__x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2787
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa1efb9c819
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa1f0aab028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fa1efe15fa0 RCX: 00007fa1efb9c819
RDX: 0000000000000010 RSI: 00002000000012c0 RDI: 0000000000000007
RBP: 00007fa1efc32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa1efe16038 R14: 00007fa1efe15fa0 R15: 00007fa1eff3fa48
rcu: rcu_preempt kthread starved for 10506 jiffies! g410293 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:27536 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x17b4/0x5680 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7282
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 7532 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xe32/0x1210 kernel/smp.c:892
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 c7 fc 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 72 f8 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 56 f8
RSP: 0018:ffffc9000dd07560 EFLAGS: 00000293
RAX: ffffffff81b91b6a RBX: 1ffff110170e8161 RCX: ffff888029199ec0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000dd07688 R08: ffffffff9032f3b7 R09: 1ffffffff2065e76
R10: dffffc0000000000 R11: fffffbfff2065e77 R12: ffff8880b8740b08
R13: dffffc0000000000 R14: ffff8880b863c108 R15: 0000000000000001
FS: 0000555578d40500(0000) GS:ffff888125231000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33b22ff8 CR3: 0000000011bf8000 CR4: 00000000003526f0
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1057
__flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline]
flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
flush_tlb_mm_range+0x5c3/0x10b0 arch/x86/mm/tlb.c:1451
dup_mmap+0x17a2/0x1d90 mm/mmap.c:1905
dup_mm kernel/fork.c:1533 [inline]
copy_mm+0x13b/0x4a0 kernel/fork.c:1585
copy_process+0x1f1c/0x4450 kernel/fork.c:2261
kernel_clone+0x284/0x8f0 kernel/fork.c:2718
__do_sys_clone kernel/fork.c:2859 [inline]
__se_sys_clone kernel/fork.c:2843 [inline]
__x64_sys_clone+0x1b6/0x230 kernel/fork.c:2843
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdd2e9c5292
Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007fdd2ed3fc60 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fdd2ed3fc60 RCX: 00007fdd2e9c5292
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fdd2ed3fdec R08: 0000000000000000 R09: 0000000000000001
R10: 0000555578d407d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 00000000002b3572 R15: 00007fdd2ed3fe40