rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10496 ticks this GP) idle=94ac/1/0x4000000000000000 softirq=90176/90177 fqs=41
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1157780         14            0
rcu: 	cputime:    26327       2828           10   ==> 29160(ms)
rcu: 	(t=10500 jiffies g=98569 q=284 ncpus=2)
rcu: rcu_preempt kthread starved for 782 jiffies! g98569 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:26024 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x1553/0x45a0 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x313/0x1590 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 22271 Comm: syz.0.5617 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:lock_is_held_type+0x13e/0x190 kernel/locking/lockdep.c:5830
Code: 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c5 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 e8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc90000007788 EFLAGS: 00000206
RAX: 4b5e0b8d14221200 RBX: ffff8880789e0000 RCX: 4b5e0b8d14221200
RDX: 0000000000000100 RSI: ffffffff8acadb60 RDI: ffffffff8b1c8e60
RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff2238aa0
R10: dffffc0000000000 R11: fffffbfff2238aa1 R12: 0000000000000001
R13: 0000000000000246 R14: ffffffff8d1320a0 R15: ffff8880789e0b08
FS:  00007efde74d66c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000066986000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lookup_page_ext mm/page_ext.c:240 [inline]
 page_ext_get+0x193/0x2b0 mm/page_ext.c:509
 __reset_page_owner+0x2e/0x190 mm/page_owner.c:145
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1181 [inline]
 free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
 napi_frag_unref include/linux/skbuff.h:3539 [inline]
 skb_release_data+0x49a/0x800 net/core/skbuff.c:985
 skb_release_all net/core/skbuff.c:1057 [inline]
 __kfree_skb+0x57/0x70 net/core/skbuff.c:1071
 tcp_write_queue_purge+0x143/0x2f0 net/ipv4/tcp.c:3007
 tcp_done_with_error+0x43/0xc0 net/ipv4/tcp_input.c:4446
 tcp_write_err net/ipv4/tcp_timer.c:72 [inline]
 tcp_write_timeout net/ipv4/tcp_timer.c:281 [inline]
 tcp_retransmit_timer+0x1728/0x3020 net/ipv4/tcp_timer.c:576
 tcp_write_timer+0x12a/0x280 net/ipv4/tcp_timer.c:709
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x542/0x800 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:bpf_prog_83d37dda6cf46a9a+0x4/0x1e
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc 40 00 00 00 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc f3 0f 1e fa <0f> 1f 44 00 00 66 90 55 48 89 e5 f3 0f 1e fa 41 56 45 31 f6 31 c0
RSP: 0018:ffffc900054f70b8 EFLAGS: 00000286
RAX: 1ffff92000a9da06 RBX: ffffc900054ed048 RCX: dffffc0000000000
RDX: ffffc9000cb71000 RSI: ffffc900054ed048 RDI: ffffe8ffffcbb000
RBP: ffffc900054f71b8 R08: ffffc900054f714f R09: 0000000000000000
R10: ffffc900054f7140 R11: fffff52000a9ee2a R12: ffffc900054ed030
R13: ffff88801837cf98 R14: ffff88801837cfa8 R15: 0000000000000001
 perf_trace_run_bpf_submit+0x7a/0x1c0 kernel/events/core.c:10295
 perf_trace_lock+0x304/0x3b0 include/trace/events/lock.h:50
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0x866/0x8c0 kernel/locking/lockdep.c:5765
 __fs_reclaim_release mm/page_alloc.c:3604 [inline]
 fs_reclaim_release mm/page_alloc.c:3630 [inline]
 might_alloc include/linux/sched/mm.h:304 [inline]
 prepare_alloc_pages+0x1ba/0x5f0 mm/page_alloc.c:4270
 __alloc_pages+0x134/0x460 mm/page_alloc.c:4489
 __alloc_pages_node include/linux/gfp.h:237 [inline]
 alloc_pages_node include/linux/gfp.h:260 [inline]
 __kmalloc_large_node+0x8c/0x1e0 mm/slab_common.c:1148
 __do_kmalloc_node mm/slab_common.c:995 [inline]
 __kmalloc_node_track_caller+0x10d/0x230 mm/slab_common.c:1027
 kmalloc_reserve+0x116/0x240 net/core/skbuff.c:584
 __alloc_skb+0x138/0x2c0 net/core/skbuff.c:653
 alloc_skb include/linux/skbuff.h:1316 [inline]
 nlmsg_new include/net/netlink.h:1010 [inline]
 netlink_ack+0x376/0x1180 net/netlink/af_netlink.c:2482
 netlink_rcv_skb+0x2c5/0x4d0 net/netlink/af_netlink.c:2551
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 sock_write_iter+0x2df/0x420 net/socket.c:1160
 call_write_iter include/linux/fs.h:2018 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x46c/0x990 fs/read_write.c:584
 ksys_write+0x150/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efde659c819
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007efde74d6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007efde6815fa0 RCX: 00007efde659c819
RDX: 000000000000fe33 RSI: 0000200000000040 RDI: 0000000000000009
RBP: 00007efde6632c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efde6816038 R14: 00007efde6815fa0 R15: 00007ffe1ba6f588
 </TASK>
CPU: 0 PID: 22271 Comm: syz.0.5617 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:lock_is_held_type+0x13e/0x190 kernel/locking/lockdep.c:5830
Code: 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c5 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 e8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc90000007788 EFLAGS: 00000206
RAX: 4b5e0b8d14221200 RBX: ffff8880789e0000 RCX: 4b5e0b8d14221200
RDX: 0000000000000100 RSI: ffffffff8acadb60 RDI: ffffffff8b1c8e60
RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff2238aa0
R10: dffffc0000000000 R11: fffffbfff2238aa1 R12: 0000000000000001
R13: 0000000000000246 R14: ffffffff8d1320a0 R15: ffff8880789e0b08
FS:  00007efde74d66c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000066986000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lookup_page_ext mm/page_ext.c:240 [inline]
 page_ext_get+0x193/0x2b0 mm/page_ext.c:509
 __reset_page_owner+0x2e/0x190 mm/page_owner.c:145
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1181 [inline]
 free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
 napi_frag_unref include/linux/skbuff.h:3539 [inline]
 skb_release_data+0x49a/0x800 net/core/skbuff.c:985
 skb_release_all net/core/skbuff.c:1057 [inline]
 __kfree_skb+0x57/0x70 net/core/skbuff.c:1071
 tcp_write_queue_purge+0x143/0x2f0 net/ipv4/tcp.c:3007
 tcp_done_with_error+0x43/0xc0 net/ipv4/tcp_input.c:4446
 tcp_write_err net/ipv4/tcp_timer.c:72 [inline]
 tcp_write_timeout net/ipv4/tcp_timer.c:281 [inline]
 tcp_retransmit_timer+0x1728/0x3020 net/ipv4/tcp_timer.c:576
 tcp_write_timer+0x12a/0x280 net/ipv4/tcp_timer.c:709
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x542/0x800 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:bpf_prog_83d37dda6cf46a9a+0x4/0x1e
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc 40 00 00 00 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc f3 0f 1e fa <0f> 1f 44 00 00 66 90 55 48 89 e5 f3 0f 1e fa 41 56 45 31 f6 31 c0
RSP: 0018:ffffc900054f70b8 EFLAGS: 00000286
RAX: 1ffff92000a9da06 RBX: ffffc900054ed048 RCX: dffffc0000000000
RDX: ffffc9000cb71000 RSI: ffffc900054ed048 RDI: ffffe8ffffcbb000
RBP: ffffc900054f71b8 R08: ffffc900054f714f R09: 0000000000000000
R10: ffffc900054f7140 R11: fffff52000a9ee2a R12: ffffc900054ed030
R13: ffff88801837cf98 R14: ffff88801837cfa8 R15: 0000000000000001
 perf_trace_run_bpf_submit+0x7a/0x1c0 kernel/events/core.c:10295
 perf_trace_lock+0x304/0x3b0 include/trace/events/lock.h:50
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0x866/0x8c0 kernel/locking/lockdep.c:5765
 __fs_reclaim_release mm/page_alloc.c:3604 [inline]
 fs_reclaim_release mm/page_alloc.c:3630 [inline]
 might_alloc include/linux/sched/mm.h:304 [inline]
 prepare_alloc_pages+0x1ba/0x5f0 mm/page_alloc.c:4270
 __alloc_pages+0x134/0x460 mm/page_alloc.c:4489
 __alloc_pages_node include/linux/gfp.h:237 [inline]
 alloc_pages_node include/linux/gfp.h:260 [inline]
 __kmalloc_large_node+0x8c/0x1e0 mm/slab_common.c:1148
 __do_kmalloc_node mm/slab_common.c:995 [inline]
 __kmalloc_node_track_caller+0x10d/0x230 mm/slab_common.c:1027
 kmalloc_reserve+0x116/0x240 net/core/skbuff.c:584
 __alloc_skb+0x138/0x2c0 net/core/skbuff.c:653
 alloc_skb include/linux/skbuff.h:1316 [inline]
 nlmsg_new include/net/netlink.h:1010 [inline]
 netlink_ack+0x376/0x1180 net/netlink/af_netlink.c:2482
 netlink_rcv_skb+0x2c5/0x4d0 net/netlink/af_netlink.c:2551
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 sock_write_iter+0x2df/0x420 net/socket.c:1160
 call_write_iter include/linux/fs.h:2018 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x46c/0x990 fs/read_write.c:584
 ksys_write+0x150/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efde659c819
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007efde74d6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007efde6815fa0 RCX: 00007efde659c819
RDX: 000000000000fe33 RSI: 0000200000000040 RDI: 0000000000000009
RBP: 00007efde6632c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efde6816038 R14: 00007efde6815fa0 R15: 00007ffe1ba6f588
 </TASK>