rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=d384/1/0x4000000000000000 softirq=70172/70184 fqs=1
rcu: 	(detected by 1, t=10502 jiffies, g=78965, q=286 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 17963 Comm: syz.0.2880 Not tainted 6.14.0-rc2-syzkaller-00039-g09fbf3d50205 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:debug_object_activate+0xaf/0x580 lib/debugobjects.c:806
Code: 35 0f f3 48 8d 5c 24 70 ba 10 00 00 00 4c 89 e7 31 f6 e8 94 ec 36 fd 48 89 d8 48 c1 e8 03 48 89 44 24 38 42 0f b6 04 30 84 c0 <0f> 85 12 04 00 00 c7 44 24 70 05 00 00 00 49 8d 7c 24 14 48 89 f8
RSP: 0018:ffffc90000007be0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffc90000007c50 RCX: 0000000000000000
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc90000007c50
RBP: ffffc90000007cf8 R08: ffffc90000007c4f R09: ffffc90000007c40
R10: dffffc0000000000 R11: fffff52000000f8a R12: ffffc90000007c40
R13: 1ffff92000000f84 R14: dffffc0000000000 R15: ffff8880276ea340
FS:  00007fc3666286c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c4550e1 CR3: 000000007c628000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 debug_hrtimer_activate kernel/time/hrtimer.c:455 [inline]
 debug_activate kernel/time/hrtimer.c:496 [inline]
 enqueue_hrtimer+0x30/0x3c0 kernel/time/hrtimer.c:1100
 __run_hrtimer kernel/time/hrtimer.c:1818 [inline]
 __hrtimer_run_queues+0x6cb/0xd30 kernel/time/hrtimer.c:1865
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1927
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x112/0x420 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:finish_task_switch+0x1ea/0x870 kernel/sched/core.c:5251
Code: c9 50 e8 49 0a 0c 00 48 83 c4 08 4c 89 f7 e8 fd 39 00 00 0f 1f 44 00 00 4c 89 f7 e8 80 fd 69 0a e8 7b 75 38 00 fb 48 8b 5d c0 <48> 8d bb 08 16 00 00 48 89 f8 48 c1 e8 03 49 be 00 00 00 00 00 fc
RSP: 0018:ffffc900107ef1c8 EFLAGS: 00000282
RAX: cd4093bc18f36c00 RBX: ffff88803220da00 RCX: ffffffff9a402903
RDX: dffffc0000000000 RSI: ffffffff8c0aa680 RDI: ffffffff8c608cc0
RBP: ffffc900107ef210 R08: ffffffff901b6077 R09: 1ffffffff2036c0e
R10: dffffc0000000000 R11: fffffbfff2036c0f R12: 1ffff110170c7eee
R13: dffffc0000000000 R14: ffff8880b863e940 R15: ffff8880b863f770
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x1916/0x4c90 kernel/sched/core.c:6764
 __schedule_loop kernel/sched/core.c:6841 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6856
 schedule_timeout+0xb0/0x290 kernel/time/sleep_timeout.c:75
 unix_wait_for_peer+0x250/0x340 net/unix/af_unix.c:1526
 unix_dgram_sendmsg+0xc7c/0x1df0 net/unix/af_unix.c:2127
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg+0x223/0x270 net/socket.c:733
 ____sys_sendmsg+0x52a/0x7e0 net/socket.c:2573
 ___sys_sendmsg net/socket.c:2627 [inline]
 __sys_sendmmsg+0x36a/0x720 net/socket.c:2716
 __do_sys_sendmmsg net/socket.c:2743 [inline]
 __se_sys_sendmmsg net/socket.c:2740 [inline]
 __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2740
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc36578cde9
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:00007fc366628038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fc3659a5fa0 RCX: 00007fc36578cde9
RDX: 0000000000000651 RSI: 0000400000000000 RDI: 0000000000000006
RBP: 00007fc36580e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc3659a5fa0 R15: 00007ffed99e5c38
 </TASK>
rcu: rcu_preempt kthread starved for 10500 jiffies! g78965 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:26104 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5377 [inline]
 __schedule+0x190e/0x4c90 kernel/sched/core.c:6764
 __schedule_loop kernel/sched/core.c:6841 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6856
 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2024
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2226
 kthread+0x7ab/0x920 kernel/kthread.c:464
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 17969 Comm: syz.1.2883 Not tainted 6.14.0-rc2-syzkaller-00039-g09fbf3d50205 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:get_current arch/x86/include/asm/current.h:49 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d c4 03 72 0c 48 89 de 5b e9 63 4f 5b 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 80 d6 03 00 65 8b 15 d0 86 44 7e 81 e2 00 01 ff 00
RSP: 0018:ffffc90010a5f678 EFLAGS: 00000202
RAX: ffffffff81b36b65 RBX: 1ffff110170c8c99 RCX: ffff88802ba03c00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90010a5f880 R08: ffffffff81b36b30 R09: 1ffff9200214bec0
R10: dffffc0000000000 R11: fffff5200214bec1 R12: ffff8880b873fb48
R13: ffff8880b86464c8 R14: ffff8880b873fb40 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f28a537b000 CR3: 0000000060ed4000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 csd_lock_wait kernel/smp.c:340 [inline]
 smp_call_function_many_cond+0x1bc5/0x2d30 kernel/smp.c:885
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:966 [inline]
 flush_tlb_mm_range+0x42d/0x710 arch/x86/mm/tlb.c:1054
 tlb_flush arch/x86/include/asm/tlb.h:20 [inline]
 tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:481 [inline]
 tlb_flush_mmu+0x1aa/0x680 mm/mmu_gather.c:395
 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:488
 exit_mmap+0x52a/0xd40 mm/mmap.c:1297
 __mmput+0x115/0x420 kernel/fork.c:1356
 exit_mm+0x220/0x310 kernel/exit.c:570
 do_exit+0x9ad/0x28e0 kernel/exit.c:925
 do_group_exit+0x207/0x2c0 kernel/exit.c:1087
 __do_sys_exit_group kernel/exit.c:1098 [inline]
 __se_sys_exit_group kernel/exit.c:1096 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1096
 x64_sys_call+0x26a8/0x26b0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7f9958cde9
Code: Unable to access opcode bytes at 0x7f7f9958cdbf.
RSP: 002b:00007ffcf328e158 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7f9958cde9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffcf328e1bc R08: 00000003f328e24f R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000246
R13: 00000000000927c0 R14: 000000000013425f R15: 00007ffcf328e210
 </TASK>