rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=a6f/1/0x4000000000000002 softirq=30846/30846 fqs=0 
	(detected by 1, t=10506 jiffies, g=44049, q=377)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 13285 Comm: syz.2.2461 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:asm_sysvec_irq_work+0x0/0x20 arch/x86/include/asm/idtentry.h:707
Code: e9 a5 03 00 00 90 90 90 90 90 0f 01 ca fc 6a ff e8 a5 02 00 00 48 89 c4 48 89 e7 e8 1a 5f e9 ff e9 85 03 00 00 90 90 90 90 90 <0f> 01 ca fc 6a ff e8 85 02 00 00 48 89 c4 48 89 e7 e8 ea 63 e9 ff
RSP: 0000:ffffc900030efab8 EFLAGS: 00000006
RAX: d0fb38a1e17e4400 RBX: 1ffff9200061df60 RCX: d0fb38a1e17e4400
RDX: dffffc0000000000 RSI: ffffffff8a2b2b60 RDI: ffffffff8a7a5100
RBP: ffffc900030efba8 R08: ffffffff910470c7 R09: 1ffffffff2208e18
R10: dffffc0000000000 R11: fffffbfff2208e19 R12: ffffffff8d123400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  000055558b84a500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32b23ffc CR3: 000000005f6a6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 d2 f6 9c 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0000:ffffc900030efae0 EFLAGS: 00000206
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 __unlock_page_memcg+0xea/0x100 mm/memcontrol.c:2093
 do_set_pte+0x3c9/0x530 mm/memory.c:4069
 finish_fault+0x532/0x8c0 mm/memory.c:4143
 do_shared_fault mm/memory.c:4336 [inline]
 do_fault mm/memory.c:4396 [inline]
 handle_pte_fault mm/memory.c:4650 [inline]
 __handle_mm_fault mm/memory.c:4785 [inline]
 handle_mm_fault+0x21a0/0x4440 mm/memory.c:4883
 do_user_addr_fault+0x494/0xc90 arch/x86/mm/fault.c:1355
 handle_page_fault arch/x86/mm/fault.c:1443 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1496
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7f1720c13111
Code: 89 dc 41 83 e4 03 0f 85 a1 01 00 00 4c 89 ff be 04 00 00 00 e8 40 8b fe ff 49 8b 47 40 41 83 47 30 04 48 8d 50 fc 49 89 57 40 <89> 68 fc 41 8b 47 30 48 83 c4 28 5b 5d 41 5c 41 5d 41 5e 41 5f c3
RSP: 002b:00007ffe27ba71b0 EFLAGS: 00010202
RAX: 0000001b32b24000 RBX: 0000000000000000 RCX: 00000000005ffde8
RDX: 0000001b32b23ffc RSI: 00000000005ffde8 RDI: 00007f1721af4700
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f1720fb1000
R10: 00007f1721af4700 R11: ffffffff819fffff R12: 0000000000000000
R13: 0000000000000f07 R14: ffffffff819d8d14 R15: 00007f1721af4720
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g44049 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=32599
rcu: rcu_preempt kthread starved for 10506 jiffies! g44049 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:27392 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2117
 rcu_gp_fqs_loop+0x2be/0x11f0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x9a/0x370 kernel/rcu/tree.c:2145
 kthread+0x42e/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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 13285 Comm: syz.2.2461 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:__lock_acquire+0x1047/0x7d40 kernel/locking/lockdep.c:-1
Code: 60 00 00 41 09 c4 4c 89 fe 48 c1 ee 20 89 f0 c1 c0 04 41 29 f4 44 31 e0 44 01 fe 41 29 c7 89 c1 c1 c1 06 44 31 f9 01 f0 89 ca <c1> c2 08 29 ce 31 f2 01 c1 29 d0 41 89 d6 41 c1 c6 10 41 31 c6 01
RSP: 0000:ffffc900030eef60 EFLAGS: 00000006
RAX: 000000002ee8870a RBX: 0000000000000000 RCX: 000000004600eec7
RDX: 000000004600eec7 RSI: 0000000024eab170 RDI: ffffffff910470c0
RBP: ffffc900030ef1a8 R08: dffffc0000000000 R09: 1ffffffff2208e18
R10: dffffc0000000000 R11: fffffbfff2208e19 R12: 000000001e88ec84
R13: ffff888075178000 R14: ffff888075178b90 R15: 0000000039758845
FS:  000055558b84a500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32b23ffc CR3: 000000005f6a6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 lock_acquire+0x19f/0x400 kernel/locking/lockdep.c:5737
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313
 rcu_read_lock include/linux/rcupdate.h:740 [inline]
 __perf_output_begin kernel/events/ring_buffer.c:163 [inline]
 perf_output_begin_forward+0xa5/0xa30 kernel/events/ring_buffer.c:271
 __perf_event_output kernel/events/core.c:7816 [inline]
 perf_event_output_forward+0x19b/0x2e0 kernel/events/core.c:7834
 __perf_event_overflow+0x35f/0x550 kernel/events/core.c:9527
 perf_swevent_overflow kernel/events/core.c:9603 [inline]
 perf_swevent_event+0x4b8/0x540 kernel/events/core.c:9641
 perf_tp_event+0x324/0xbe0 kernel/events/core.c:10059
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10033
 perf_trace_preemptirq_template+0x2aa/0x360 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 d2 f6 9c 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0000:ffffc900030efae0 EFLAGS: 00000206
RAX: d0fb38a1e17e4400 RBX: 1ffff9200061df60 RCX: d0fb38a1e17e4400
RDX: dffffc0000000000 RSI: ffffffff8a2b2b60 RDI: ffffffff8a7a5100
RBP: ffffc900030efba8 R08: ffffffff910470c7 R09: 1ffffffff2208e18
R10: dffffc0000000000 R11: fffffbfff2208e19 R12: ffffffff8d123400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 __unlock_page_memcg+0xea/0x100 mm/memcontrol.c:2093
 do_set_pte+0x3c9/0x530 mm/memory.c:4069
 finish_fault+0x532/0x8c0 mm/memory.c:4143
 do_shared_fault mm/memory.c:4336 [inline]
 do_fault mm/memory.c:4396 [inline]
 handle_pte_fault mm/memory.c:4650 [inline]
 __handle_mm_fault mm/memory.c:4785 [inline]
 handle_mm_fault+0x21a0/0x4440 mm/memory.c:4883
 do_user_addr_fault+0x494/0xc90 arch/x86/mm/fault.c:1355
 handle_page_fault arch/x86/mm/fault.c:1443 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1496
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7f1720c13111
Code: 89 dc 41 83 e4 03 0f 85 a1 01 00 00 4c 89 ff be 04 00 00 00 e8 40 8b fe ff 49 8b 47 40 41 83 47 30 04 48 8d 50 fc 49 89 57 40 <89> 68 fc 41 8b 47 30 48 83 c4 28 5b 5d 41 5c 41 5d 41 5e 41 5f c3
RSP: 002b:00007ffe27ba71b0 EFLAGS: 00010202
RAX: 0000001b32b24000 RBX: 0000000000000000 RCX: 00000000005ffde8
RDX: 0000001b32b23ffc RSI: 00000000005ffde8 RDI: 00007f1721af4700
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f1720fb1000
R10: 00007f1721af4700 R11: ffffffff819fffff R12: 0000000000000000
R13: 0000000000000f07 R14: ffffffff819d8d14 R15: 00007f1721af4720
 </TASK>