rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P1960/1:b..l P28282/3:b..l
rcu: (detected by 1, t=10502 jiffies, g=148133, q=563 ncpus=2)
task:syz.2.5976 state:R running task stack:26120 pid:28282 tgid:28282 ppid:25074 task_flags:0x400040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:7047
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+0x3e/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
filemap_map_pages+0x1194/0x1e00 mm/filemap.c:3931
do_fault_around mm/memory.c:5713 [inline]
do_read_fault mm/memory.c:5746 [inline]
do_fault+0x9cd/0x1ad0 mm/memory.c:5889
do_pte_missing mm/memory.c:4401 [inline]
handle_pte_fault mm/memory.c:6273 [inline]
__handle_mm_fault+0x1919/0x2bb0 mm/memory.c:6411
handle_mm_fault+0x3fe/0xad0 mm/memory.c:6580
do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x64/0xc0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f65cd26f2ed
RSP: 002b:00007ffceb4d09f0 EFLAGS: 00010202
RAX: 000000110c344000 RBX: 00007f65ce115720 RCX: 0000000000000001
RDX: 000000000000014d RSI: 0000000000003685 RDI: 0000000000000002
RBP: ffffffff8b1da14d R08: 00007f65cd5e6128 R09: 00007f65cd5d2000
R10: 00007f65cc9fd008 R11: 0000000000000013 R12: 0000000000000013
R13: 0000000000000000 R14: ffffffff8b1da725 R15: 000000000000188d
task:kworker/u8:8 state:R running task stack:22632 pid:1960 tgid:1960 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: netns cleanup_net
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7190
irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x62/0x330 kernel/locking/lockdep.c:5872
Code: b3 18 12 83 f8 07 0f 87 a2 02 00 00 89 c0 48 0f a3 05 52 b1 ee 0e 0f 82 74 02 00 00 8b 35 ea e1 ee 0e 85 f6 0f 85 8d 00 00 00 <48> 8b 44 24 30 65 48 2b 05 69 b3 18 12 0f 85 ad 02 00 00 48 83 c4
RSP: 0018:ffffc90005267060 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff8e3c96a0 RCX: 00000000a2cf06f9
RDX: 0000000000000000 RSI: ffffffff8daa8a1d RDI: ffffffff8bf2b400
RBP: 0000000000000002 R08: 00000000f490ceca R09: 00000000af490cec
R10: 0000000000000002 R11: ffff88802a372ff0 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
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+0xd1/0x20b0 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
__call_rcu_common.constprop.0+0xa5/0xa10 kernel/rcu/tree.c:3119
security_inode_free+0xa4/0x170 security/security.c:1227
__destroy_inode+0x20a/0x740 fs/inode.c:371
destroy_inode+0x91/0x1b0 fs/inode.c:394
evict+0x599/0xad0 fs/inode.c:861
iput_final fs/inode.c:1954 [inline]
iput.part.0+0x621/0x1190 fs/inode.c:2006
iput+0x35/0x40 fs/inode.c:1969
dentry_unlink_inode+0x29c/0x480 fs/dcache.c:467
__dentry_kill+0x1d0/0x600 fs/dcache.c:670
finish_dput+0x76/0x480 fs/dcache.c:879
dput.part.0+0x451/0x570 fs/dcache.c:928
dput+0x1f/0x30 fs/dcache.c:920
find_next_child+0x18f/0x280 fs/libfs.c:592
__simple_recursive_removal+0x2c4/0x610 fs/libfs.c:609
debugfs_remove+0x5d/0x80 fs/debugfs/inode.c:781
wiphy_unregister+0x1f4/0xc20 net/wireless/core.c:1191
ieee80211_unregister_hw+0x248/0x3a0 net/mac80211/main.c:1703
mac80211_hwsim_del_radio drivers/net/wireless/virtual/mac80211_hwsim.c:5916 [inline]
hwsim_exit_net+0x788/0x1590 drivers/net/wireless/virtual/mac80211_hwsim.c:6807
ops_exit_list net/core/net_namespace.c:199 [inline]
ops_undo_list+0x2ee/0xab0 net/core/net_namespace.c:252
cleanup_net+0x41b/0x830 net/core/net_namespace.c:696
process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
process_scheduled_works kernel/workqueue.c:3340 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: rcu_preempt kthread starved for 10582 jiffies! g148133 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:28064 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6960
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xaf0 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x26d/0x380 kernel/rcu/tree.c:2285
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 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:
CPU: 1 UID: 0 PID: 28303 Comm: syz.1.5981 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:__vmcs_readl arch/x86/kvm/vmx/vmx_ops.h:121 [inline]
RIP: 0010:vmcs_readl arch/x86/kvm/vmx/vmx_ops.h:188 [inline]
RIP: 0010:vmx_read_guest_seg_base+0xdc/0x180 arch/x86/kvm/vmx/vmx.c:903
Code: 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 67 48 89 d8 48 c1 e0 04 8b 80 64 0c 85 8b 41 0f 78 c5 <3e> 77 0e 45 31 ed 41 55 50 e8 86 46 26 0a 58 41 5d 48 8d 04 5b 4d
RSP: 0018:ffffc9000457f448 EFLAGS: 00000202
RAX: 0000000000006808 RBX: 0000000000000001 RCX: ffffc9000fe01000
RDX: 0000000000000000 RSI: ffffffff8151b5cd RDI: ffffffff8b850c74
RBP: ffff88802a9e8000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: ffff88802d08d4b0 R12: 0000000000000000
R13: 0000000000000000 R14: ffff888031ce0008 R15: ffff888031ce0000
FS: 00007fd3e6c926c0(0000) GS:ffff8881249f4000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000a4569000 CR4: 00000000003526f0
Call Trace:
vmx_get_segment_base+0xcb/0x140 arch/x86/kvm/vmx/vmx.c:3695
seg_base arch/x86/kvm/emulate.c:528 [inline]
__linearize arch/x86/kvm/emulate.c:650 [inline]
__do_insn_fetch_bytes+0x178/0x720 arch/x86/kvm/emulate.c:861
x86_decode_insn+0xf88/0x6170 arch/x86/kvm/emulate.c:4863
x86_decode_emulated_instruction arch/x86/kvm/x86.c:9379 [inline]
x86_emulate_instruction+0x838/0x1c00 arch/x86/kvm/x86.c:9431
kvm_mmu_page_fault+0xbfd/0x1c60 arch/x86/kvm/mmu/mmu.c:6464
handle_ept_misconfig arch/x86/kvm/vmx/vmx.c:5926 [inline]
handle_ept_misconfig+0x11a/0x380 arch/x86/kvm/vmx/vmx.c:5908
__vmx_handle_exit arch/x86/kvm/vmx/vmx.c:6752 [inline]
vmx_handle_exit+0x726/0x1a00 arch/x86/kvm/vmx/vmx.c:6770
vcpu_enter_guest arch/x86/kvm/x86.c:11490 [inline]
vcpu_run+0x3468/0x5a80 arch/x86/kvm/x86.c:11648
kvm_arch_vcpu_ioctl_run+0xfd3/0x1860 arch/x86/kvm/x86.c:11993
kvm_vcpu_ioctl+0x76d/0x16d0 virt/kvm/kvm_main.c:4492
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd3e5d8f749
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:00007fd3e6c92038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd3e5fe5fa0 RCX: 00007fd3e5d8f749
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007fd3e5e13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd3e5fe6038 R14: 00007fd3e5fe5fa0 R15: 00007fff742ae3d8