rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6040/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=13361, q=648 ncpus=2)
task:dhcpcd-run-hook state:R  running task     stack:26088 pid:6040  ppid:6036   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x15ae/0x4700 kernel/sched/core.c:6722
 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7032
 irqentry_exit+0x67/0x70 kernel/entry/common.c:441
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:check_kcov_mode kernel/kcov.c:189 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x36/0x60 kernel/kcov.c:212
Code: 10 e4 7b 7e 65 8b 15 11 e4 7b 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 24 16 00 00 00 74 2c 8b 91 00 16 00 00 <83> fa 02 75 21 48 8b 91 08 16 00 00 48 8b 32 48 8d 7e 01 8b 89 04
RSP: 0018:ffffc90003476f20 EFLAGS: 00000246
RAX: ffffffff819536d0 RBX: 0000000000000000 RCX: ffff88802cdfbc00
RDX: 0000000000000000 RSI: 00007f8b9389e636 RDI: ffffffffa0000c18
RBP: 0000000000000000 R08: dffffc0000000000 R09: 1ffffffff24446a0
R10: dffffc0000000000 R11: fffffbfff24446a1 R12: ffffffffa0000c18
R13: dffffc0000000000 R14: 00007f8b9389e636 R15: 0000000000000000
 __lt_find include/linux/rbtree_latch.h:113 [inline]
 latch_tree_find include/linux/rbtree_latch.h:208 [inline]
 bpf_ksym_find kernel/bpf/core.c:710 [inline]
 is_bpf_text_address+0x1c0/0x2a0 kernel/bpf/core.c:744
 kernel_text_address+0xa0/0xd0 kernel/extable.c:125
 __kernel_text_address+0xd/0x30 kernel/extable.c:79
 unwind_get_return_address+0x5d/0xc0 arch/x86/kernel/unwind_orc.c:369
 arch_stack_walk+0x11d/0x190 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770
 slab_alloc_node mm/slub.c:3518 [inline]
 slab_alloc mm/slub.c:3526 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3533 [inline]
 kmem_cache_alloc+0x17e/0x2d0 mm/slub.c:3542
 ptlock_alloc+0x20/0x70 mm/memory.c:6179
 ptlock_init include/linux/mm.h:2964 [inline]
 pagetable_pte_ctor include/linux/mm.h:2987 [inline]
 __pte_alloc_one include/asm-generic/pgalloc.h:71 [inline]
 pte_alloc_one+0xcc/0x540 arch/x86/mm/pgtable.c:33
 __pte_alloc+0x22/0x2a0 mm/memory.c:438
 copy_pte_range mm/memory.c:1029 [inline]
 copy_pmd_range mm/memory.c:1168 [inline]
 copy_pud_range mm/memory.c:1205 [inline]
 copy_p4d_range mm/memory.c:1229 [inline]
 copy_page_range+0x2dca/0x3700 mm/memory.c:1323
 dup_mmap kernel/fork.c:769 [inline]
 dup_mm kernel/fork.c:1700 [inline]
 copy_mm+0x1751/0x1e30 kernel/fork.c:1749
 copy_process+0x16c9/0x3da0 kernel/fork.c:2510
 kernel_clone+0x24b/0x8a0 kernel/fork.c:2919
 __do_sys_clone kernel/fork.c:3062 [inline]
 __se_sys_clone kernel/fork.c:3046 [inline]
 __x64_sys_clone+0x1b7/0x230 kernel/fork.c:3046
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f8b9389e636
RSP: 002b:00007ffe1b3ecc60 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffe1b3ecc68 RCX: 00007f8b9389e636
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000560903998e60 R08: 0000000000000000 R09: 0000000000000000
R10: 00007f8b93704f50 R11: 0000000000000246 R12: 000056090399af70
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10555 jiffies! g13361 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:26856 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x15ae/0x4700 kernel/sched/core.c:6722
 schedule+0xbd/0x170 kernel/sched/core.c:6796
 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x30d/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: 6041 Comm: syz.1.18 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:178 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x17/0x60 kernel/kcov.c:212
Code: 48 8b 3d cc 06 06 0e 48 89 de 5b e9 e3 33 58 00 cc cc cc f3 0f 1e fa 48 8b 04 24 65 48 8b 0d 10 e4 7b 7e 65 8b 15 11 e4 7b 7e <81> e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 24 16 00 00
RSP: 0018:ffffc900034678c0 EFLAGS: 00000286
RAX: ffffffff81cc929c RBX: ffff8880330f5f40 RCX: ffff8880330f5a00
RDX: 0000000080000000 RSI: ffffffff8aeae2c0 RDI: ffffffff8b3c50e0
RBP: 00000000000000a8 R08: ffffffff8f8dd86f R09: 1ffffffff1f1bb0d
R10: dffffc0000000000 R11: fffffbfff1f1bb0e R12: dffffc0000000000
R13: 1ffff1100661ebe8 R14: ffffffff8ae59ec0 R15: ffff88807e148000
FS:  000055556b646500(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff79f871220 CR3: 0000000078d86000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 __might_fault+0x9c/0x120 mm/memory.c:5970
 __clear_user arch/x86/include/asm/uaccess_64.h:168 [inline]
 copy_fpstate_to_sigframe+0x14b/0xce0 arch/x86/kernel/fpu/signal.c:216
 get_sigframe+0x5de/0x7d0 arch/x86/kernel/signal.c:142
 x64_setup_rt_frame+0x164/0xc30 arch/x86/kernel/signal_64.c:175
 setup_rt_frame arch/x86/kernel/signal.c:223 [inline]
 handle_signal arch/x86/kernel/signal.c:267 [inline]
 arch_do_signal_or_restart+0x411/0x7b0 arch/x86/kernel/signal.c:312
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:213
 __syscall_exit_to_user_mode_work kernel/entry/common.c:294 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:305
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ff79f99f559
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:00007ffc7f974718 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007ff79fc25fa0 RCX: 00007ff79f99f559
RDX: 0000200000000080 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ff79fa36b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff79fc25fac R14: 00007ff79fc25fa0 R15: 00007ff79fc25fa0
 </TASK>
sched: RT throttling activated