rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-...!: (1 GPs behind) idle=7cf4/1/0x4000000000000000 softirq=90291/90302 fqs=14
rcu: (t=10500 jiffies g=83969 q=742 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10467 jiffies! g83969 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=40253
rcu: rcu_preempt kthread starved for 10468 jiffies! g83969 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27288 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7026
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 21860 Comm: modprobe Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d f3 20 21 00 f3 0f 1e fa fb f4 c8 e6 02 00 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000a07c58 EFLAGS: 00000246
RAX: ffffffff8172bd9d RBX: 0000000000000003 RCX: ffff88806e869e40
RDX: 0000000000000100 RSI: ffffffff8d7102db RDI: ffffffff8bbf0760
RBP: ffffc90000a07d30 R08: ffffffff8f7cfd77 R09: 1ffffffff1ef9fae
R10: dffffc0000000000 R11: fffffbfff1ef9faf R12: dffffc0000000000
R13: 0000000000000200 R14: 0000000000000003 R15: 1ffff92000140f90
FS: 00007f16ca0e0c80(0000) GS:ffff888126238000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f16ca2b4a90 CR3: 0000000057dee000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
kvm_wait+0x232/0x290 arch/x86/kernel/kvm.c:1080
pv_wait arch/x86/include/asm/paravirt.h:569 [inline]
pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:466 [inline]
__pv_queued_spin_lock_slowpath+0x7bf/0xb60 kernel/locking/qspinlock.c:325
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:557 [inline]
queued_spin_lock_slowpath+0x43/0x50 arch/x86/include/asm/qspinlock.h:51
queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
do_raw_spin_lock+0x21f/0x290 kernel/locking/spinlock_debug.c:116
spin_lock include/linux/spinlock.h:351 [inline]
__dev_xmit_skb net/core/dev.c:4203 [inline]
__dev_queue_xmit+0xeba/0x3740 net/core/dev.c:4777
dev_queue_xmit_accel include/linux/netdevice.h:3374 [inline]
macvlan_queue_xmit drivers/net/macvlan.c:557 [inline]
macvlan_start_xmit+0x46d/0x6e0 drivers/net/macvlan.c:581
__netdev_start_xmit include/linux/netdevice.h:5259 [inline]
netdev_start_xmit include/linux/netdevice.h:5268 [inline]
xmit_one net/core/dev.c:3853 [inline]
dev_hard_start_xmit+0x2d7/0x830 net/core/dev.c:3869
__dev_queue_xmit+0x172a/0x3740 net/core/dev.c:4811
dev_queue_xmit include/linux/netdevice.h:3368 [inline]
neigh_hh_output include/net/neighbour.h:540 [inline]
neigh_output include/net/neighbour.h:554 [inline]
ip6_finish_output2+0xf70/0x1480 net/ipv6/ip6_output.c:136
NF_HOOK_COND include/linux/netfilter.h:307 [inline]
ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247
NF_HOOK include/linux/netfilter.h:318 [inline]
ndisc_send_skb+0xbce/0x1510 net/ipv6/ndisc.c:512
addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4037
call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
handle_softirqs+0x286/0x870 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:arch_atomic64_read arch/x86/include/asm/atomic64_64.h:15 [inline]
RIP: 0010:raw_atomic64_read include/linux/atomic/atomic-arch-fallback.h:2583 [inline]
RIP: 0010:raw_atomic_long_read include/linux/atomic/atomic-long.h:38 [inline]
RIP: 0010:atomic_long_read include/linux/atomic/atomic-instrumented.h:3189 [inline]
RIP: 0010:__rwsem_set_reader_owned kernel/locking/rwsem.c:175 [inline]
RIP: 0010:rwsem_set_reader_owned kernel/locking/rwsem.c:182 [inline]
RIP: 0010:rwsem_read_trylock kernel/locking/rwsem.c:257 [inline]
RIP: 0010:__down_read_common kernel/locking/rwsem.c:1260 [inline]
RIP: 0010:__down_read kernel/locking/rwsem.c:1274 [inline]
RIP: 0010:down_read+0x16d/0x2e0 kernel/locking/rwsem.c:1539
Code: 00 fc ff df 65 4c 8b 34 25 08 80 6e 92 48 83 c3 08 48 89 df be 08 00 00 00 e8 4f ec dc f6 49 89 dc 49 c1 ec 03 43 80 3c 3c 00 <74> 08 48 89 df e8 c9 e9 dc f6 48 8b 03 83 e0 02 49 09 c6 49 83 ce
RSP: 0018:ffffc9000b88f6a8 EFLAGS: 00000246
RAX: 8000000000000001 RBX: ffff88802dc0d450 RCX: ffffffff8b48db61
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88802dc0d450
RBP: ffffc9000b88f810 R08: ffff88802dc0d457 R09: 1ffff11005b81a8a
R10: dffffc0000000000 R11: ffffed1005b81a8b R12: 1ffff11005b81a8a
R13: 0000000000000017 R14: ffff88806e869e40 R15: dffffc0000000000
anon_vma_lock_read include/linux/rmap.h:137 [inline]
validate_mm+0x1cc/0x4a0 mm/vma.c:679
__split_vma+0x8bd/0xa00 mm/vma.c:569
split_vma mm/vma.c:598 [inline]
vma_modify+0x13b3/0x1970 mm/vma.c:1631
vma_modify_flags+0x1e8/0x230 mm/vma.c:1649
mprotect_fixup+0x407/0x9c0 mm/mprotect.c:816
do_mprotect_pkey+0x8c5/0xcd0 mm/mprotect.c:990
__do_sys_mprotect mm/mprotect.c:1011 [inline]
__se_sys_mprotect mm/mprotect.c:1008 [inline]
__x64_sys_mprotect+0x80/0x90 mm/mprotect.c:1008
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f16ca4772c7
Code: 89 3d fd 3f 01 00 eb 90 0f 1f 00 f7 d8 89 05 f0 3f 01 00 48 c7 c0 ff ff ff ff eb 91 0f 1f 80 00 00 00 00 b8 0a 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8d 0d c9 3f 01 00 f7 d8 89 01 48 83
RSP: 002b:00007ffe3a5f9fd8 EFLAGS: 00000206 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 00007f16ca14e6b0 RCX: 00007f16ca4772c7
RDX: 0000000000000001 RSI: 0000000000001000 RDI: 00007f16ca142000
RBP: 00007ffe3a5fa2a0 R08: 0000000000000000 R09: 00007f16ca1e12e0
R10: 00007f16ca14e6b0 R11: 0000000000000206 R12: 0000000000000038
R13: 0000010c7642cb82 R14: 0000000000000000 R15: 00007f16ca48b310
CPU: 0 UID: 0 PID: 14205 Comm: kworker/0:11 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: mld mld_ifc_work
RIP: 0010:div_s64_rem include/linux/math64.h:42 [inline]
RIP: 0010:get_cycle_time_elapsed net/sched/sch_taprio.c:230 [inline]
RIP: 0010:find_entry_to_transmit+0x205/0x8d0 net/sched/sch_taprio.c:351
Code: 4c 89 ef e8 2d 8a c5 f8 48 8b 44 24 50 49 2b 45 00 49 63 f7 48 89 c1 48 09 f1 48 c1 e9 20 4c 89 7c 24 28 74 16 48 99 48 f7 fe <49> 89 d7 eb 14 e8 91 c8 5f f8 31 ed e9 e9 05 00 00 31 d2 41 f7 f7
RSP: 0018:ffffc9001af0eab8 EFLAGS: 00000207
RAX: 000030f237d709e3 RBX: 0000000000119400 RCX: 0000000018794cdd
RDX: 000000000000193e RSI: 0000000000008001 RDI: ffff8880264ab260
RBP: ffff88806d7dc130 R08: ffff8880264ab267 R09: 1ffff11004c9564c
R10: dffffc0000000000 R11: ffffed1004c9564d R12: ffff88806d7dc000
R13: ffff88806d7dc140 R14: dffffc0000000000 R15: 0000000000008001
FS: 0000000000000000(0000) GS:ffff888126138000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f099e0ebf98 CR3: 0000000063c9c000 CR4: 00000000003526f0
Call Trace:
get_packet_txtime net/sched/sch_taprio.c:502 [inline]
taprio_enqueue_one+0xb66/0x1650 net/sched/sch_taprio.c:571
dev_qdisc_enqueue+0x4e/0x260 net/core/dev.c:4126
__dev_xmit_skb net/core/dev.c:4242 [inline]
__dev_queue_xmit+0x1ad8/0x3740 net/core/dev.c:4777
dev_queue_xmit_accel include/linux/netdevice.h:3374 [inline]
macvlan_queue_xmit drivers/net/macvlan.c:557 [inline]
macvlan_start_xmit+0x46d/0x6e0 drivers/net/macvlan.c:581
__netdev_start_xmit include/linux/netdevice.h:5259 [inline]
netdev_start_xmit include/linux/netdevice.h:5268 [inline]
xmit_one net/core/dev.c:3853 [inline]
dev_hard_start_xmit+0x2d7/0x830 net/core/dev.c:3869
__dev_queue_xmit+0x172a/0x3740 net/core/dev.c:4811
dev_queue_xmit include/linux/netdevice.h:3368 [inline]
neigh_hh_output include/net/neighbour.h:540 [inline]
neigh_output include/net/neighbour.h:554 [inline]
ip6_finish_output2+0xf70/0x1480 net/ipv6/ip6_output.c:136
NF_HOOK_COND include/linux/netfilter.h:307 [inline]
ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247
NF_HOOK+0x9e/0x380 include/linux/netfilter.h:318
mld_sendpack+0x8d4/0xe60 net/ipv6/mcast.c:1855
mld_send_cr net/ipv6/mcast.c:2154 [inline]
mld_ifc_work+0x83e/0xd60 net/ipv6/mcast.c:2693
process_one_work kernel/workqueue.c:3263 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245