rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=cc3c/1/0x4000000000000002 softirq=40485/40485 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11202
	(detected by 1, t=10506 jiffies, g=56333, q=2066 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11202 Comm: syz.7.1977 Not tainted 6.1.129-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:ct_dynticks_nmi_nesting include/linux/context_tracking_state.h:92 [inline]
RIP: 0010:ct_nmi_enter+0x24/0x170 kernel/context_tracking.c:264
Code: 00 00 00 00 66 90 41 57 41 56 53 e8 66 08 00 00 89 c3 83 f8 08 0f 83 16 01 00 00 49 c7 c6 a0 56 03 00 4c 03 34 dd 70 49 df 8c <48> c7 c7 40 16 15 8b e8 60 09 00 00 65 48 8b 05 f0 64 52 75 48 85
RSP: 0018:ffffc90000007c40 EFLAGS: 00000086
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88801e7e3b80
RDX: 0000000000000100 RSI: ffffffff8b5f6d60 RDI: ffffffff8b5f6d20
RBP: ffffc90000007d10 R08: ffffffff81b6078b R09: fffffbfff1d413e6
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: 1ffff92000000f8c R14: ffff8880b8e356a0 R15: dffffc0000000000
FS:  00007f3a871796c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c346095 CR3: 00000000207f5000 CR4: 00000000003506f0
DR0: 0000000000000002 DR1: 0000000000000000 DR2: 0000000000000082
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 ct_irq_enter_irqson+0xda/0x1b0 kernel/context_tracking.c:407
 trace_irq_enable_rcuidle+0xa0/0x140 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:variable_ffs arch/x86/include/asm/bitops.h:319 [inline]
RIP: 0010:handle_softirqs+0x1f7/0xa40 kernel/softirq.c:566
Code: 00 00 00 44 0f b7 fb 48 c7 c7 20 13 0b 8b e8 00 b6 5c 09 65 66 c7 05 16 5a af 7e 00 00 e8 71 12 3d 00 fb 49 c7 c5 c0 a0 00 8d <44> 89 7c 24 54 b8 ff ff ff ff 0f bc 44 24 54 41 89 c6 41 ff c6 0f
RSP: 0018:ffffc90000007e00 EFLAGS: 00000286
RAX: 5dd6debd1cdab900 RBX: 0000000000400200 RCX: ffffffff816b145a
RDX: dffffc0000000000 RSI: ffffffff8b0c1d40 RDI: ffffffff8b5f6d80
RBP: ffffc90000007f30 R08: dffffc0000000000 R09: fffffbfff2256c51
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88801e7e3b80
R13: ffffffff8d00a0c0 R14: 1ffff92000000fd8 R15: 0000000000000200
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0x157/0x240 kernel/softirq.c:661
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:rcu_read_unlock_special+0x61/0x540 kernel/rcu/tree_plugin.h:627
Code: 20 b3 8a b5 41 48 c7 44 24 28 2a aa bc 8c 48 c7 44 24 30 60 54 74 81 4c 8d 7c 24 20 49 c1 ef 03 48 b8 f1 f1 f1 f1 00 f2 f2 f2 <49> 89 04 17 66 41 c7 44 17 09 f3 f3 41 c6 44 17 0b f3 65 44 8b 25
RSP: 0018:ffffc9000dea71c0 EFLAGS: 00000a06
RAX: f2f2f200f1f1f1f1 RBX: 1ffff11003cfc7f7 RCX: 0000000000080000
RDX: dffffc0000000000 RSI: 000000000001cf53 RDI: ffff88801e7e3b80
RBP: ffffc9000dea7288 R08: ffffffff81ecb0a2 R09: ffffed1003481168
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88801e7e3fbc R14: ffff88801e7e3b80 R15: 1ffff92001bd4e3c
 __rcu_read_unlock+0x92/0x100 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 page_ext_put+0x91/0xb0 mm/page_ext.c:182
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1459 [inline]
 free_pcp_prepare mm/page_alloc.c:1509 [inline]
 free_unref_page_prepare+0x12a6/0x15b0 mm/page_alloc.c:3384
 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3479
 free_slab mm/slub.c:2031 [inline]
 discard_slab mm/slub.c:2037 [inline]
 __unfreeze_partials+0x1b7/0x210 mm/slub.c:2586
 put_cpu_partial+0x17b/0x250 mm/slub.c:2662
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737
 slab_alloc_node mm/slub.c:3398 [inline]
 kmem_cache_alloc_node+0x136/0x310 mm/slub.c:3443
 __alloc_skb+0xd3/0x2c0 net/core/skbuff.c:505
 alloc_skb include/linux/skbuff.h:1271 [inline]
 nlmsg_new include/net/netlink.h:991 [inline]
 netlink_ack+0x392/0x12a0 net/netlink/af_netlink.c:2430
 netlink_rcv_skb+0x24a/0x410 net/netlink/af_netlink.c:2499
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:861
 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
 netlink_unicast+0x7e2/0x970 net/netlink/af_netlink.c:1337
 netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1859
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5d3/0x9a0 net/socket.c:2519
 ___sys_sendmsg net/socket.c:2573 [inline]
 __sys_sendmsg+0x2a9/0x390 net/socket.c:2602
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3a8638d169
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:00007f3a87179038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3a865a5fa0 RCX: 00007f3a8638d169
RDX: 0000000000000000 RSI: 0000400000000000 RDI: 0000000000000005
RBP: 00007f3a8640e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3a865a5fa0 R15: 00007fffa5bbe838
 </TASK>
task:syz.7.1977      state:R  running task     stack:23992 pid:11202 ppid:6403   flags:0x0000400c
Call Trace:
 <TASK>
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g56333 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=35487
rcu: rcu_preempt kthread starved for 10506 jiffies! g56333 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:26656 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5243 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6560
 schedule+0xbf/0x180 kernel/sched/core.c:6636
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11202 Comm: syz.7.1977 Not tainted 6.1.129-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__rcu_read_unlock+0x74/0x100 kernel/rcu/tree_plugin.h:431
Code: 4d 8d be 40 04 00 00 4c 89 f8 48 c1 e8 03 42 0f b6 04 20 84 c0 75 78 41 83 3f 00 75 23 42 0f b6 04 23 84 c0 75 52 41 8b 45 00 <3d> 00 00 00 40 73 0b 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 0b eb f1
RSP: 0018:ffffc900000075f8 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 1ffff11003cfc7f7 RCX: ffff88801e7e3b80
RDX: 0000000000000100 RSI: ffffffff8b5f6d60 RDI: ffffffff8b5f6d20
RBP: 0000000000000001 R08: ffffffff81b42c16 R09: fffffbfff2256c4d
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88801e7e3fbc R14: ffff88801e7e3b80 R15: ffffc900000077c0
FS:  00007f3a871796c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c346095 CR3: 00000000207f5000 CR4: 00000000003506f0
DR0: 0000000000000002 DR1: 0000000000000000 DR2: 0000000000000082
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 rcu_read_unlock+0x85/0xa0 include/linux/rcupdate.h:823
 __perf_output_begin kernel/events/ring_buffer.c:262 [inline]
 perf_output_begin_forward+0x77e/0xaf0 kernel/events/ring_buffer.c:271
 __perf_event_output kernel/events/core.c:7708 [inline]
 perf_event_output_forward+0x1e5/0x330 kernel/events/core.c:7726
 __perf_event_overflow+0x45e/0x640 kernel/events/core.c:9472
 perf_tp_event+0x35a/0xc80 kernel/events/core.c:10005
 perf_trace_run_bpf_submit+0xf7/0x1d0 kernel/events/core.c:9978
 perf_trace_preemptirq_template+0x2d1/0x3d0 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0xd5/0x140 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:variable_ffs arch/x86/include/asm/bitops.h:319 [inline]
RIP: 0010:handle_softirqs+0x1f7/0xa40 kernel/softirq.c:566
Code: 00 00 00 44 0f b7 fb 48 c7 c7 20 13 0b 8b e8 00 b6 5c 09 65 66 c7 05 16 5a af 7e 00 00 e8 71 12 3d 00 fb 49 c7 c5 c0 a0 00 8d <44> 89 7c 24 54 b8 ff ff ff ff 0f bc 44 24 54 41 89 c6 41 ff c6 0f
RSP: 0018:ffffc90000007e00 EFLAGS: 00000286
RAX: 5dd6debd1cdab900 RBX: 0000000000400200 RCX: ffffffff816b145a
RDX: dffffc0000000000 RSI: ffffffff8b0c1d40 RDI: ffffffff8b5f6d80
RBP: ffffc90000007f30 R08: dffffc0000000000 R09: fffffbfff2256c51
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88801e7e3b80
R13: ffffffff8d00a0c0 R14: 1ffff92000000fd8 R15: 0000000000000200
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0x157/0x240 kernel/softirq.c:661
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:rcu_read_unlock_special+0x61/0x540 kernel/rcu/tree_plugin.h:627
Code: 20 b3 8a b5 41 48 c7 44 24 28 2a aa bc 8c 48 c7 44 24 30 60 54 74 81 4c 8d 7c 24 20 49 c1 ef 03 48 b8 f1 f1 f1 f1 00 f2 f2 f2 <49> 89 04 17 66 41 c7 44 17 09 f3 f3 41 c6 44 17 0b f3 65 44 8b 25
RSP: 0018:ffffc9000dea71c0 EFLAGS: 00000a06
RAX: f2f2f200f1f1f1f1 RBX: 1ffff11003cfc7f7 RCX: 0000000000080000
RDX: dffffc0000000000 RSI: 000000000001cf53 RDI: ffff88801e7e3b80
RBP: ffffc9000dea7288 R08: ffffffff81ecb0a2 R09: ffffed1003481168
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88801e7e3fbc R14: ffff88801e7e3b80 R15: 1ffff92001bd4e3c
 __rcu_read_unlock+0x92/0x100 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 page_ext_put+0x91/0xb0 mm/page_ext.c:182
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1459 [inline]
 free_pcp_prepare mm/page_alloc.c:1509 [inline]
 free_unref_page_prepare+0x12a6/0x15b0 mm/page_alloc.c:3384
 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3479
 free_slab mm/slub.c:2031 [inline]
 discard_slab mm/slub.c:2037 [inline]
 __unfreeze_partials+0x1b7/0x210 mm/slub.c:2586
 put_cpu_partial+0x17b/0x250 mm/slub.c:2662
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737
 slab_alloc_node mm/slub.c:3398 [inline]
 kmem_cache_alloc_node+0x136/0x310 mm/slub.c:3443
 __alloc_skb+0xd3/0x2c0 net/core/skbuff.c:505
 alloc_skb include/linux/skbuff.h:1271 [inline]
 nlmsg_new include/net/netlink.h:991 [inline]
 netlink_ack+0x392/0x12a0 net/netlink/af_netlink.c:2430
 netlink_rcv_skb+0x24a/0x410 net/netlink/af_netlink.c:2499
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:861
 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
 netlink_unicast+0x7e2/0x970 net/netlink/af_netlink.c:1337
 netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1859
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5d3/0x9a0 net/socket.c:2519
 ___sys_sendmsg net/socket.c:2573 [inline]
 __sys_sendmsg+0x2a9/0x390 net/socket.c:2602
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3a8638d169
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:00007f3a87179038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3a865a5fa0 RCX: 00007f3a8638d169
RDX: 0000000000000000 RSI: 0000400000000000 RDI: 0000000000000005
RBP: 00007f3a8640e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3a865a5fa0 R15: 00007fffa5bbe838
 </TASK>