rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5833/1:b..l P10043/1:b..l P10035/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=42129, q=244 ncpus=2)
task:syz.2.1092 state:R running task stack:24640 pid:10035 tgid:10034 ppid:5825 task_flags:0x40054c flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x14bc/0x5000 kernel/sched/core.c:6863
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7047
preempt_schedule+0xae/0xc0 kernel/sched/core.c:7071
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
zap_pte_range mm/memory.c:1884 [inline]
zap_pmd_range mm/memory.c:1946 [inline]
zap_pud_range mm/memory.c:1975 [inline]
zap_p4d_range mm/memory.c:1996 [inline]
unmap_page_range+0x38be/0x4170 mm/memory.c:2017
unmap_single_vma mm/memory.c:2059 [inline]
unmap_vmas+0x399/0x580 mm/memory.c:2101
exit_mmap+0x239/0xb10 mm/mmap.c:1277
__mmput+0x118/0x430 kernel/fork.c:1173
exit_mm+0x1da/0x2c0 kernel/exit.c:581
do_exit+0x658/0x2310 kernel/exit.c:959
do_group_exit+0x21c/0x2d0 kernel/exit.c:1112
get_signal+0x1285/0x1340 kernel/signal.c:3034
arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
exit_to_user_mode_loop+0x87/0x4f0 kernel/entry/common.c:75
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x2e3/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fad90d8f749
RSP: 002b:00007fad91c240e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007fad90fe5fa8 RCX: 00007fad90d8f749
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fad90fe5fac
RBP: 00007fad90fe5fa0 R08: 3fffffffffffffff R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fad90fe6038 R14: 00007ffed0c61fc0 R15: 00007ffed0c620a8
task:modprobe state:R running task stack:24312 pid:10043 tgid:10043 ppid:13 task_flags:0x40000c flags:0x00080001
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x14bc/0x5000 kernel/sched/core.c:6863
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190
irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:unwind_next_frame+0x17c4/0x2390 arch/x86/kernel/unwind_orc.c:-1
Code: fb 0a 00 00 4c 89 e8 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 0e 0b 00 00 49 0f bf 04 24 48 01 c6 4c 89 f7 48 89 da e8 4c 0e 00 00 <84> c0 0f 84 47 01 00 00 48 bd 00 00 00 00 00 fc ff df 48 8b 44 24
RSP: 0018:ffffc9001b77f438 EFLAGS: 00000286
RAX: 1ffff920036efe01 RBX: ffffffff9015bf7c RCX: 0000000000000001
RDX: ffffc9001b77f548 RSI: dffffc0000000000 RDI: ffffc9001b77fe68
RBP: dffffc0000000000 R08: ffffc9001b77fe68 R09: 0000000000000000
R10: ffffc9001b77f558 R11: fffff520036efead R12: ffffc9001b77fe68
R13: ffffc9001b77f558 R14: ffffc9001b77f508 R15: 1ffffffff202b7ef
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
__call_rcu_common kernel/rcu/tree.c:3119 [inline]
call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3239
slab_free_hook mm/slub.c:2504 [inline]
slab_free mm/slub.c:6668 [inline]
kmem_cache_free+0x488/0x620 mm/slub.c:6779
exit_mmap+0x52c/0xb10 mm/mmap.c:1302
__mmput+0x118/0x430 kernel/fork.c:1173
exit_mm+0x1da/0x2c0 kernel/exit.c:581
do_exit+0x658/0x2310 kernel/exit.c:959
do_group_exit+0x21c/0x2d0 kernel/exit.c:1112
__do_sys_exit_group kernel/exit.c:1123 [inline]
__se_sys_exit_group kernel/exit.c:1121 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1121
x64_sys_call+0x2210/0x2210 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1f3a3416c5
RSP: 002b:00007ffc19ae0a28 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f1f3a442fe8 RCX: 00007f1f3a3416c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000001
RBP: 0000000000000001 R08: 00007ffc19ae09b8 R09: 0000000000000000
R10: 00007ffc19ae0850 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f1f3a441680 R15: 00007f1f3a443000
task:syz-executor state:R running task stack:19496 pid:5833 tgid:5833 ppid:5821 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x14bc/0x5000 kernel/sched/core.c:6863
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190
irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x16c/0x340 kernel/locking/lockdep.c:5872
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 94 41 e0 10 <48> 3b 44 24 58 0f 85 e5 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000411f178 EFLAGS: 00000206
RAX: 396c0220b228bc00 RBX: 0000000000000000 RCX: 396c0220b228bc00
RDX: 000000005a44979c RSI: ffffffff8d97865c RDI: ffffffff8bc07c60
RBP: ffffffff81743f85 R08: ffffffff81743f85 R09: ffffffff8df41a60
R10: ffffc9000411f338 R11: ffffffff81ada810 R12: 0000000000000002
R13: ffffffff8df41a60 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:867 [inline]
class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
save_stack+0xf5/0x1f0 mm/page_owner.c:165
__reset_page_owner+0x71/0x1f0 mm/page_owner.c:320
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
__free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2943
__kasan_populate_vmalloc_do mm/kasan/shadow.c:393 [inline]
__kasan_populate_vmalloc+0x1b2/0x1d0 mm/kasan/shadow.c:424
kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
alloc_vmap_area+0xdc4/0x14e0 mm/vmalloc.c:2124
__get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3219
__vmalloc_node_range_noprof+0x371/0x16a0 mm/vmalloc.c:4011
__vmalloc_node_noprof mm/vmalloc.c:4111 [inline]
vzalloc_noprof+0xb2/0xf0 mm/vmalloc.c:4189
__do_replace+0xab/0x980 net/ipv6/netfilter/ip6_tables.c:1063
do_replace net/ipv6/netfilter/ip6_tables.c:1158 [inline]
do_ip6t_set_ctl+0xa16/0xce0 net/ipv6/netfilter/ip6_tables.c:1644
nf_setsockopt+0x26f/0x290 net/netfilter/nf_sockopt.c:101
do_sock_setsockopt+0x17c/0x1b0 net/socket.c:2337
__sys_setsockopt net/socket.c:2362 [inline]
__do_sys_setsockopt net/socket.c:2368 [inline]
__se_sys_setsockopt net/socket.c:2365 [inline]
__x64_sys_setsockopt+0x13f/0x1b0 net/socket.c:2365
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f26be59163a
RSP: 002b:00007ffe64461968 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ffe644619f0 RCX: 00007f26be59163a
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00000000000003b8 R09: 0079746972756365
R10: 00007f26be7b5d00 R11: 0000000000000206 R12: 00007f26be7b5ca0
R13: 00007ffe6446198c R14: 0000000000000000 R15: 00007f26be7b7e60
rcu: rcu_preempt kthread starved for 10608 jiffies! g42129 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:27328 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x14bc/0x5000 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6960
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+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
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: 10051 Comm: syz.4.1095 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__rdmsr arch/x86/include/asm/msr.h:70 [inline]
RIP: 0010:native_read_msr arch/x86/include/asm/msr.h:108 [inline]
RIP: 0010:get_debugctlmsr arch/x86/include/asm/debugreg.h:183 [inline]
RIP: 0010:vcpu_enter_guest arch/x86/kvm/x86.c:11332 [inline]
RIP: 0010:vcpu_run+0x48ef/0x76b0 arch/x86/kvm/x86.c:11639
Code: 00 00 31 ff e8 52 d7 7a 00 48 81 e3 aa 00 00 00 4c 8b b4 24 48 01 00 00 0f 85 72 15 00 00 e8 58 d2 7a 00 b9 d9 01 00 00 0f 32 <49> 89 d4 49 c1 e4 20 49 09 c4 0f 1f 44 00 00 e8 3d d2 7a 00 4c 89
RSP: 0018:ffffc9001b7af560 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000000001d9
RDX: 0000000000000000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9001b7af990 R08: ffff888025285b87 R09: 1ffff11004a50b70
R10: dffffc0000000000 R11: ffffed1004a50b71 R12: 1ffff1100d35a642
R13: 0000000000000000 R14: ffff888069ad2c28 R15: dffffc0000000000
FS: 00007fd4f7a7f6c0(0000) GS:ffff888125f34000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000043950000 CR4: 00000000003526f0
Call Trace:
kvm_arch_vcpu_ioctl_run+0x1148/0x1c90 arch/x86/kvm/x86.c:11984
kvm_vcpu_ioctl+0x99a/0xed0 virt/kvm/kvm_main.c:4492
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd4f6b8f749
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:00007fd4f7a7f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd4f6de6270 RCX: 00007fd4f6b8f749
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 000000000000000b
RBP: 00007fd4f6c13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd4f6de6308 R14: 00007fd4f6de6270 R15: 00007fff965e7288