rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=408c/1/0x4000000000000000 softirq=184742/184742 fqs=1
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P31322/1:b..l P31318/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=147309, q=257 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31278 Comm: syz.1.6857 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:194 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x70 kernel/kcov.c:217
Code: 08 f0 6e 92 65 8b 15 68 ec ae 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 7c 16 00 00 00 74 2c 8b 91 58 16 00 00 <83> fa 02 75 21 48 8b 91 60 16 00 00 48 8b 32 48 8d 7e 01 8b 89 5c
RSP: 0018:ffffc9000c507bf8 EFLAGS: 00000046
RAX: ffffffff8a7868ff RBX: ffff888075f59068 RCX: ffff88807ac85ac0
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffc9000c507ae0
RBP: 1ffff1100ebeb20d R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520018a0f5c R12: ffff888075f59598
R13: ffff8880470b7000 R14: ffff888075f59000 R15: ffff888075f59068
FS:  000055557f09b500(0000) GS:ffff888126231000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa92da8ac18 CR3: 0000000030a7a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 atm_dev_release_vccs+0xcf/0x360 net/atm/common.c:275
 atm_dev_deregister+0x187/0x2e0 net/atm/resources.c:151
 atmtcp_c_close+0x102/0x150 drivers/atm/atmtcp.c:257
 vcc_destroy_socket net/atm/common.c:181 [inline]
 vcc_release+0x10f/0x580 net/atm/common.c:205
 __sock_release net/socket.c:662 [inline]
 sock_close+0xc3/0x240 net/socket.c:1455
 __fput+0x44c/0xa70 fs/file_table.c:468
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xe9/0x130 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fda14f8f749
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:00007ffd22e6d188 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fda151e7da0 RCX: 00007fda14f8f749
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fda151e7da0 R08: 00000000000000cc R09: 0000000922e6d47f
R10: 00007fda151e7cb0 R11: 0000000000000246 R12: 00000000000ff69f
R13: 00007fda151e5fa0 R14: ffffffffffffffff R15: 00007ffd22e6d2a0
 </TASK>
task:syz.3.6868      state:R  running task     stack:24584 pid:31318 tgid:31317 ppid:28339  task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7256
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_release+0x2b5/0x3e0 kernel/locking/lockdep.c:5893
Code: 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 56 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 eb 8a d1 10 <48> 3b 44 24 28 0f 85 8b 00 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000481e770 EFLAGS: 00000206
RAX: f372b0a0bb30a300 RBX: 0000000000000202 RCX: f372b0a0bb30a300
RDX: 0000000000000000 RSI: ffffffff8d8fb724 RDI: ffffffff8bbf08e0
RBP: ffff8880207f65f0 R08: ffffc9000481f010 R09: 0000000000000000
R10: ffffc9000481e8f8 R11: fffff52000903d21 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8df3d6e0 R15: ffff8880207f5ac0
 rcu_lock_release include/linux/rcupdate.h:341 [inline]
 rcu_read_unlock include/linux/rcupdate.h:897 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1195 [inline]
 unwind_next_frame+0x19a9/0x2390 arch/x86/kernel/unwind_orc.c:680
 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:156
 __set_page_owner+0x8d/0x4c0 mm/page_owner.c:332
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1845
 prep_new_page mm/page_alloc.c:1853 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3879
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5178
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline]
 alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2507
 get_free_pages_noprof+0xf/0x80 mm/page_alloc.c:5237
 __kasan_populate_vmalloc mm/kasan/shadow.c:364 [inline]
 kasan_populate_vmalloc+0x38/0x270 mm/kasan/shadow.c:435
 alloc_vmap_area+0xd7a/0x14c0 mm/vmalloc.c:2098
 __get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3193
 __vmalloc_node_range_noprof+0x30c/0x12d0 mm/vmalloc.c:3857
 __vmalloc_node_noprof mm/vmalloc.c:3960 [inline]
 vmalloc_noprof+0xb2/0xf0 mm/vmalloc.c:3993
 bpf_prog_calc_tag+0x4c/0x370 kernel/bpf/core.c:304
 resolve_pseudo_ldimm64+0xbc/0xc50 kernel/bpf/verifier.c:20527
 bpf_check+0x1c4a/0x1d720 kernel/bpf/verifier.c:24611
 bpf_prog_load+0x13ba/0x19e0 kernel/bpf/syscall.c:3078
 __sys_bpf+0x507/0x860 kernel/bpf/syscall.c:6150
 __do_sys_bpf kernel/bpf/syscall.c:6260 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6258 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6258
 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: 0033:0x7f640d78f749
RSP: 002b:00007f640e67c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f640d9e5fa0 RCX: 00007f640d78f749
RDX: 0000000000000094 RSI: 00002000000003c0 RDI: 0000000000000005
RBP: 00007f640d813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f640d9e6038 R14: 00007f640d9e5fa0 R15: 00007fff39ddc3e8
 </TASK>
task:modprobe        state:R  running task     stack:23720 pid:31322 tgid:31322 ppid:25500  task_flags:0x400000 flags:0x00080001
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7256
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_release+0x2b5/0x3e0 kernel/locking/lockdep.c:5893
Code: 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 56 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 eb 8a d1 10 <48> 3b 44 24 28 0f 85 8b 00 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e
RSP: 0000:ffffc9000465fcd8 EFLAGS: 00000206
RAX: f81ad3bc585a7e00 RBX: 0000000000000202 RCX: f81ad3bc585a7e00
RDX: 0000000000000001 RSI: ffffffff8d8fb724 RDI: ffffffff8bbf08e0
RBP: ffff88807c540b30 R08: 0000000000000000 R09: ffffffff820a74c7
R10: 0000000000000000 R11: fffff520008cbf98 R12: 0000000000000001
R13: 0000000000000001 R14: ffffffff8df3d6e0 R15: ffff88807c540000
 rcu_lock_release include/linux/rcupdate.h:341 [inline]
 rcu_read_unlock include/linux/rcupdate.h:897 [inline]
 lock_vma_under_rcu+0x3c2/0x4a0 mm/mmap_lock.c:257
 do_user_addr_fault+0x2d9/0x1380 arch/x86/mm/fault.c:1327
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7fa92db76487
RSP: 002b:00007fff09f23bc0 EFLAGS: 00010202
RAX: 00007fa92da8ac18 RBX: 0000000000000000 RCX: 00007fa92d8e42f8
RDX: 0000000000000018 RSI: 00007fa92d8e4400 RDI: 0000000000000000
RBP: 00007fff09f23ce0 R08: 0000000000000000 R09: 00007fa92db9eda0
R10: 00007fa92d8bd000 R11: 0000000000000203 R12: 0000000000000001
R13: 0000000000000000 R14: 00007fa92db5f5f0 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10500 jiffies! g147309 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:27224 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 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
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 25489 Comm: kworker/u8:16 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 e6 73 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 91 6f 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 75 6f
RSP: 0000:ffffc9000b8ef640 EFLAGS: 00000293
RAX: ffffffff81b4943b RBX: 1ffff11017128045 RCX: ffff888036290000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000b8ef7c0 R08: ffffffff8f7d1e77 R09: 1ffffffff1efa3ce
R10: dffffc0000000000 R11: fffffbfff1efa3cf R12: ffff8880b8940228
R13: dffffc0000000000 R14: ffff8880b883b400 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888126131000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f65cf974010 CR3: 000000000dd38000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043
 on_each_cpu include/linux/smp.h:71 [inline]
 smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2713 [inline]
 smp_text_poke_batch_finish+0x5f9/0x1130 arch/x86/kernel/alternative.c:2923
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x128/0x250 kernel/jump_label.c:210
 static_key_enable+0x1a/0x20 kernel/jump_label.c:223
 toggle_allocation_gate+0xad/0x240 mm/kfence/core.c:852
 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
 </TASK>