rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10499 ticks this GP) idle=9bdc/1/0x4000000000000000 softirq=29084/39304 fqs=0
rcu: 	(t=10500 jiffies g=17841 q=380 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g17841 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=6944
rcu: rcu_preempt kthread starved for 10500 jiffies! g17841 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27256 pid:15    tgid:15    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5392 [inline]
 __schedule+0x16a2/0x4c80 kernel/sched/core.c:6781
 __schedule_loop kernel/sched/core.c:6859 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6874
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1520 kernel/rcu/tree.c:2054
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
 kthread+0x711/0x890 kernel/kthread.c:464
 ret_from_fork+0x3f5/0x760 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
CPU: 0 UID: 0 PID: 6627 Comm: rm Not tainted 6.15.0-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:csd_lock_wait kernel/smp.c:349 [inline]
RIP: 0010:smp_call_function_many_cond+0xf1e/0x1260 kernel/smp.c:885
Code: 45 8b 65 00 44 89 e6 83 e6 01 31 ff e8 bb 52 0b 00 41 83 e4 01 49 bc 00 00 00 00 00 fc ff df 75 07 e8 66 4e 0b 00 eb 38 f3 90 <43> 0f b6 04 27 84 c0 75 11 41 f7 45 00 01 00 00 00 74 1e e8 4a 4e
RSP: 0018:ffffc900038f75c0 EFLAGS: 00000293
RAX: ffffffff81b17946 RBX: ffff8880b883cb40 RCX: ffff88807ec5bc00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900038f7740 R08: ffffffff8eefeef7 R09: 1ffffffff1ddfdde
R10: dffffc0000000000 R11: fffffbfff1ddfddf R12: dffffc0000000000
R13: ffff8880b89414a8 R14: 0000000000000001 R15: 1ffff11017128295
FS:  0000000000000000(0000) GS:ffff888126b2d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff0bf374e9c CR3: 000000000d536000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 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:1361 [inline]
 flush_tlb_mm_range+0x6a5/0x1280 arch/x86/mm/tlb.c:1451
 tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
 tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:480 [inline]
 tlb_flush_mmu+0x1a7/0x680 mm/mmu_gather.c:403
 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:496
 free_ldt_pgtables+0x17b/0x320 arch/x86/kernel/ldt.c:411
 arch_exit_mmap arch/x86/include/asm/mmu_context.h:234 [inline]
 exit_mmap+0x179/0xb30 mm/mmap.c:1270
 __mmput+0x118/0x410 kernel/fork.c:1121
 exit_mm+0x1da/0x2c0 kernel/exit.c:581
 do_exit+0x640/0x22e0 kernel/exit.c:943
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1104
 __do_sys_exit_group kernel/exit.c:1115 [inline]
 __se_sys_exit_group kernel/exit.c:1113 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1113
 x64_sys_call+0x21ba/0x21c0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x8a/0x300 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7ff0bf4d36c5
Code: Unable to access opcode bytes at 0x7ff0bf4d369b.
RSP: 002b:00007fffc66cf518 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007ff0bf5d4fe8 RCX: 00007ff0bf4d36c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000000
RBP: 0000000000000001 R08: 00007fffc66cf4a8 R09: 0000000000000000
R10: 00007fffc66cf340 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff0bf5d3680 R15: 00007ff0bf5d5000
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6626 Comm: syz.4.20 Not tainted 6.15.0-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:kasan_mem_to_shadow include/linux/kasan.h:64 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x53/0x2c0 mm/kasan/generic.c:189
Code: 00 00 00 00 80 ff ff eb 11 cc cc cc f3 0f 1e fa 49 b9 00 00 00 00 00 00 00 ff f3 0f 1e fa 4c 39 cf 0f 82 58 02 00 00 49 89 ff <49> c1 ef 03 49 ba 00 00 00 00 00 fc ff df 4f 8d 1c 17 49 ff c8 4d
RSP: 0018:ffffc900001f0d08 EFLAGS: 00000006
RAX: ffffffff81ab1601 RBX: ffff8880b8927c08 RCX: ffffffff81ab1690
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8eefeef0
RBP: ffffc900001f0e90 R08: ffffffff8eefeef8 R09: ffff800000000000
R10: dffffc0000000000 R11: ffffed1004de8a2c R12: ffff888026f45340
R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8eefeef0
FS:  00007fa50fa8a6c0(0000) GS:ffff888126c2d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa50fa69d58 CR3: 0000000027718000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 cpumask_test_cpu include/linux/cpumask.h:654 [inline]
 cpu_online include/linux/cpumask.h:1210 [inline]
 trace_hrtimer_expire_exit include/trace/events/timer.h:306 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1764 [inline]
 __hrtimer_run_queues+0x590/0xc50 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x400 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:finish_task_switch+0x26b/0x950 kernel/sched/core.c:5260
Code: 0f 84 3c 01 00 00 48 85 db 0f 85 61 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 bf cc 65 09 e8 5a 97 35 00 fb 4c 8b 65 c0 <49> 8d bc 24 20 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc90003926a18 EFLAGS: 00000286
RAX: 3ca4d36da907e100 RBX: 0000000000000000 RCX: 3ca4d36da907e100
RDX: 0000000000000006 RSI: ffffffff8d011b00 RDI: ffffffff8b5cc7e0
RBP: ffffc90003926a70 R08: ffffffff8eefeef7 R09: 1ffffffff1ddfdde
R10: dffffc0000000000 R11: fffffbfff1ddfddf R12: ffff888023f80000
R13: dffffc0000000000 R14: ffff888024825a00 R15: ffff8880b893c4d8
 context_switch kernel/sched/core.c:5395 [inline]
 __schedule+0x16aa/0x4c80 kernel/sched/core.c:6781
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6961
 preempt_schedule+0xae/0xc0 kernel/sched/core.c:6985
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0xfd/0x110 kernel/locking/spinlock.c:194
 kthread_queue_work+0x111/0x180 kernel/kthread.c:1195
 synchronize_rcu_expedited_queue_work kernel/rcu/tree_exp.h:498 [inline]
 synchronize_rcu_expedited+0x4db/0x750 kernel/rcu/tree_exp.h:1008
 synchronize_rcu+0x11a/0x310 kernel/rcu/tree.c:3319
 lockdep_unregister_key+0x2ee/0x3c0 kernel/locking/lockdep.c:6623
 __qdisc_destroy+0x166/0x400 net/sched/sch_generic.c:1081
 taprio_attach+0x25a/0x380 net/sched/sch_taprio.c:2147
 qdisc_graft+0x1228/0x1510 net/sched/sch_api.c:1176
 __tc_modify_qdisc net/sched/sch_api.c:1766 [inline]
 tc_modify_qdisc+0x176f/0x1fb0 net/sched/sch_api.c:1822
 rtnetlink_rcv_msg+0x779/0xb70 net/core/rtnetlink.c:6953
 netlink_rcv_skb+0x1e2/0x420 net/netlink/af_netlink.c:2534
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x758/0x8d0 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x800/0xb20 net/netlink/af_netlink.c:1883
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg+0x219/0x270 net/socket.c:727
 ____sys_sendmsg+0x4fd/0x7e0 net/socket.c:2566
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620
 __sys_sendmsg net/socket.c:2652 [inline]
 __do_sys_sendmsg net/socket.c:2657 [inline]
 __se_sys_sendmsg net/socket.c:2655 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x8a/0x300 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fa50eb8e969
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:00007fa50fa8a038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fa50edb5fa0 RCX: 00007fa50eb8e969
RDX: 0000000000000000 RSI: 00002000000007c0 RDI: 0000000000000004
RBP: 00007fa50ec10ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa50edb5fa0 R15: 00007fff2e35f6f8
 </TASK>