rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=083/1/0x4000000000000000 softirq=8688/8689 fqs=1 
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4335/1:b..l
	(detected by 0, t=10505 jiffies, g=8769, q=101)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4815 Comm: syz.0.101 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:214 [inline]
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:344 [inline]
RIP: 0010:cpu_online include/linux/cpumask.h:895 [inline]
RIP: 0010:trace_hrtimer_start include/trace/events/timer.h:199 [inline]
RIP: 0010:debug_activate kernel/time/hrtimer.c:466 [inline]
RIP: 0010:enqueue_hrtimer+0x81/0x370 kernel/time/hrtimer.c:1069
Code: 00 00 e8 72 e4 0f 00 45 89 fd 41 c1 ef 06 4a 8d 3c fd 28 9d 69 8d be 08 00 00 00 e8 09 4e 54 00 31 f6 4c 0f a3 2d 67 b5 01 0c <40> 0f 92 c5 40 0f 92 c6 bf 02 00 00 00 e8 9d e6 0f 00 40 84 ed 74
RSP: 0000:ffffc90000dd0a48 EFLAGS: 00000047
RAX: ffffffff8167e701 RBX: ffff888018da4340 RCX: ffffffff8167e7b7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8d699d28
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff1ad33a6
R10: fffffbfff1ad33a6 R11: 1ffffffff1ad33a5 R12: dffffc0000000000
R13: 0000000000000001 R14: ffff8880b912a340 R15: 0000000000000000
FS:  00007f9c0f38a6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555578819808 CR3: 000000007bbbc000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1702 [inline]
 __hrtimer_run_queues+0x65a/0xc40 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1108
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:ffs arch/x86/include/asm/bitops.h:297 [inline]
RIP: 0010:handle_softirqs+0x1a9/0x820 kernel/softirq.c:564
Code: 24 78 44 89 64 24 28 0f b7 db 48 c7 c7 80 04 0a 8a e8 5b 07 61 08 65 66 c7 05 51 21 bb 7e 00 00 e8 3c 72 35 00 fb 89 5c 24 34 <b8> ff ff ff ff 0f bc 44 24 34 41 89 c5 41 ff c5 0f 85 c1 00 00 00
RSP: 0000:ffffc90000dd0e20 EFLAGS: 00000282
RAX: 95ed54fa89416500 RBX: 0000000000000040 RCX: 95ed54fa89416500
RDX: dffffc0000000000 RSI: ffffffff8a0b1c60 RDI: ffffffff8a59e580
RBP: ffffc90000dd0f30 R08: dffffc0000000000 R09: fffffbfff1ff7c2c
R10: fffffbfff1ff7c2c R11: 1ffffffff1ff7c2b R12: 000000000000000a
R13: 0000000000000000 R14: ffff888077e9bb80 R15: dffffc0000000000
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_call_function_single arch/x86/kernel/smp.c:243 [inline]
 sysvec_call_function_single+0x9d/0xc0 arch/x86/kernel/smp.c:243
 </IRQ>
 <TASK>
 asm_sysvec_call_function_single+0x16/0x20 arch/x86/include/asm/idtentry.h:684
RIP: 0010:lock_release+0x584/0x870 kernel/locking/lockdep.c:5647
Code: 00 00 00 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 75 75 f7 44 24 50 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 2f 00 00 00 00 66 43 c7 44 2f 09 00 00 43 c6 44 2f 0b 00
RSP: 0000:ffffc9000309f660 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1672b6fb0ac2f54d RCX: 95ed54fa89416500
RDX: 0000000000000002 RSI: ffffffff8a0b2f00 RDI: ffffffff8a59e580
RBP: ffffc9000309f778 R08: dffffc0000000000 R09: fffffbfff1ad33a6
R10: fffffbfff1ad33a6 R11: 1ffffffff1ad33a5 R12: ffff888077e9c6c0
R13: dffffc0000000000 R14: ffff888077e9c660 R15: 1ffff92000613ed8
 rcu_read_unlock include/linux/rcupdate.h:773 [inline]
 blk_cgroup_congested include/linux/blk-cgroup.h:291 [inline]
 __cgroup_throttle_swaprate+0x363/0x530 mm/swapfile.c:3809
 cgroup_throttle_swaprate include/linux/swap.h:728 [inline]
 shmem_add_to_page_cache+0xb7b/0x14b0 mm/shmem.c:727
 shmem_getpage_gfp+0x1793/0x2d40 mm/shmem.c:1940
 shmem_getpage mm/shmem.c:151 [inline]
 shmem_write_begin+0xcd/0x1a0 mm/shmem.c:2474
 generic_perform_write+0x2aa/0x530 mm/filemap.c:3785
 __generic_file_write_iter+0x25f/0x4e0 mm/filemap.c:3912
 generic_file_write_iter+0xa6/0x1b0 mm/filemap.c:3944
 call_write_iter include/linux/fs.h:2173 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x712/0xd00 fs/read_write.c:594
 ksys_write+0x14d/0x250 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f9c11121a7f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007f9c0f389df0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007f9c11121a7f
RDX: 0000000001000000 RSI: 00007f9c06f6a000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000009753
R10: 000020000001c602 R11: 0000000000000293 R12: 0000000000000004
R13: 00007f9c0f389ef0 R14: 00007f9c0f389eb0 R15: 00007f9c06f6a000
 </TASK>
task:kworker/u4:8    state:R  running task     stack:26728 pid: 4335 ppid:     2 flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11bb/0x4390 kernel/sched/core.c:6395
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6799
 irqentry_exit+0x63/0x70 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:lock_acquire+0x41/0x3f0 kernel/locking/lockdep.c:5591
Code: 00 4c 89 4c 24 20 4c 89 44 24 30 48 89 4c 24 28 89 d3 89 74 24 1c 49 89 fc 65 48 8b 04 25 28 00 00 00 48 89 84 24 c0 00 00 00 <49> bf 00 00 00 00 00 fc ff df 48 c7 44 24 60 b3 8a b5 41 48 c7 44
RSP: 0000:ffffc9000316f900 EFLAGS: 00000286
RAX: 6b5eb938dc091900 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8c11c760
RBP: ffffc9000316fa20 R08: 0000000000000000 R09: 0000000000000000
R10: fffffbfff1ad33a6 R11: 1ffffffff1ad33a5 R12: ffffffff8c11c760
R13: dffffc0000000000 R14: ffff88814cf3da70 R15: ffffffff8d413820
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313
 rcu_read_lock include/linux/rcupdate.h:740 [inline]
 inet_twsk_purge+0x119/0x810 net/ipv4/inet_timewait_sock.c:268
 ops_exit_list net/core/net_namespace.c:177 [inline]
 cleanup_net+0x77b/0xb80 net/core/net_namespace.c:635
 process_one_work+0x863/0x1000 kernel/workqueue.c:2310
 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g8769 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=2725
rcu: rcu_preempt kthread starved for 10500 jiffies! g8769 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27008 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11bb/0x4390 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x98/0x350 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 4829 Comm: syz.1.104 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <IRQ>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_check_gp_kthread_starvation+0x1cd/0x250 kernel/rcu/tree_stall.h:487
 print_other_cpu_stall+0x10c8/0x1220 kernel/rcu/tree_stall.h:592
 check_cpu_stall kernel/rcu/tree_stall.h:745 [inline]
 rcu_pending kernel/rcu/tree.c:3936 [inline]
 rcu_sched_clock_irq+0x831/0x1110 kernel/rcu/tree.c:2619
 update_process_times+0x193/0x200 kernel/time/timer.c:1818
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4fe/0xc40 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_many_cond+0xbab/0xd70 kernel/smp.c:969
Code: 45 0b 00 eb 43 f3 90 48 b8 00 00 00 00 00 fc ff df 41 0f b6 44 05 00 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 d5 45 0b 00 <eb> d9 44 89 e1 80 e1 07 80 c1 03 38 c1 7c e2 4c 89 e7 e8 ce ad 4f
RSP: 0018:ffffc9000328f2a0 EFLAGS: 00000246
RAX: ffffffff816c863b RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc90003f43000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000328f3e0 R08: dffffc0000000000 R09: fffffbfff1ff7c1a
R10: fffffbfff1ff7c1a R11: 1ffffffff1ff7c19 R12: ffff8880b91405c8
R13: 1ffff110172280b9 R14: ffff8880b903b3c0 R15: 0000000000000001
 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1134
 __purge_vmap_area_lazy+0x216/0x18f0 mm/vmalloc.c:1690
 _vm_unmap_aliases+0x410/0x4a0 mm/vmalloc.c:2114
 change_page_attr_set_clr+0x311/0xc10 arch/x86/mm/pat/set_memory.c:1740
 change_page_attr_clear arch/x86/mm/pat/set_memory.c:1797 [inline]
 set_memory_ro+0x89/0xd0 arch/x86/mm/pat/set_memory.c:1943
 bpf_jit_binary_lock_ro include/linux/filter.h:899 [inline]
 bpf_int_jit_compile+0xc4a8/0xcc80 arch/x86/net/bpf_jit_comp.c:2478
 bpf_prog_select_runtime+0x46f/0x7c0 kernel/bpf/core.c:1977
 bpf_prog_load+0x106e/0x1550 kernel/bpf/syscall.c:2358
 __sys_bpf+0x4c2/0x670 kernel/bpf/syscall.c:4657
 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4759 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f8b4e214fc9
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:00007f8b4c47c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f8b4e46bfa0 RCX: 00007f8b4e214fc9
RDX: 0000000000000094 RSI: 00002000000005c0 RDI: 0000000000000005
RBP: 00007f8b4e297f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8b4e46c038 R14: 00007f8b4e46bfa0 R15: 00007ffd76ac8048
 </TASK>