rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4998/1:b..l
(detected by 1, t=10502 jiffies, g=13441, q=544)
task:sed state:R running task stack:27312 pid: 4998 ppid: 4997 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6799
irqentry_exit+0x63/0x70 kernel/entry/common.c:432
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:681
RIP: 0010:lock_acquire+0xe8/0x400 kernel/locking/lockdep.c:5596
Code: de 2c 0c 73 0d e8 a8 ce 07 00 84 c0 0f 84 2d 02 00 00 48 c7 c0 c4 23 8a 8d 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 1c 02 00 00 <83> 3d 25 12 2d 0c 00 0f 84 0a 01 00 00 65 8b 05 94 67 a5 7e 85 c0
RSP: 0018:ffffc900035df3a0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 7245b60010f52a00
RDX: 0000000000000000 RSI: ffffffff8a79fde0 RDI: ffffffff8a79fda0
RBP: ffffc900035df4c0 R08: ffffffff8d89f02f R09: 1ffffffff1b13e05
R10: dffffc0000000000 R11: fffffbfff1b13e06 R12: ffffffff8c31eb20
R13: 1ffff920006bbe80 R14: 0000000000000000 R15: dffffc0000000000
rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313
rcu_read_lock include/linux/rcupdate.h:740 [inline]
is_bpf_text_address+0x1d/0x270 kernel/bpf/core.c:725
kernel_text_address kernel/extable.c:151 [inline]
__kernel_text_address+0x9a/0x100 kernel/extable.c:105
unwind_get_return_address+0x49/0x80 arch/x86/kernel/unwind_orc.c:323
arch_stack_walk+0xf2/0x140 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
save_stack+0x121/0x230 mm/page_owner.c:119
__reset_page_owner+0x51/0x180 mm/page_owner.c:140
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1340 [inline]
free_pcp_prepare mm/page_alloc.c:1391 [inline]
free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
free_unref_page_list+0x119/0x820 mm/page_alloc.c:3433
release_pages+0x186c/0x1be0 mm/swap.c:963
tlb_batch_pages_flush mm/mmu_gather.c:50 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:241 [inline]
tlb_flush_mmu mm/mmu_gather.c:248 [inline]
tlb_finish_mmu+0x1b4/0x370 mm/mmu_gather.c:371
exit_mmap+0x3d0/0x640 mm/mmap.c:3218
__mmput+0x115/0x3b0 kernel/fork.c:1127
exit_mm+0x588/0x6e0 kernel/exit.c:550
do_exit+0x5a9/0x20c0 kernel/exit.c:870
do_group_exit+0x12e/0x300 kernel/exit.c:997
__do_sys_exit_group kernel/exit.c:1008 [inline]
__se_sys_exit_group kernel/exit.c:1006 [inline]
__x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1006
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f5bc17296c5
RSP: 002b:00007ffdb6a081a8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f5bc182afe8 RCX: 00007f5bc17296c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5bc1829680 R15: 00007f5bc182b000
rcu: rcu_preempt kthread starved for 10551 jiffies! g13441 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:28016 pid: 15 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11ef/0x43c0 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/0x11d0 kernel/rcu/tree.c:1972
rcu_gp_kthread+0x9b/0x370 kernel/rcu/tree.c:2145
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
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: 4995 Comm: syz.1.47 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__lock_acquire+0x352/0x7d10 kernel/locking/lockdep.c:4939
Code: 2d 0c 00 0f 85 24 57 00 00 48 c7 c7 a0 26 2b 8a 48 c7 c6 00 4f 2b 8a e8 2c c0 54 08 0f 0b e9 0a 57 00 00 31 c0 4c 89 64 24 70 <48> 8d 04 80 48 8b 4c 24 30 4c 8d a4 c1 f0 0a 00 00 48 8d 8c c1 10
RSP: 0018:ffffc9000360f6a0 EFLAGS: 00000046
RAX: 0000000000000001 RBX: ffff88807baa9350 RCX: ffffffff962dbf03
RDX: 0000000000000a1e RSI: 0000000000000000 RDI: ffff88807baa9350
RBP: ffffc9000360f8f0 R08: dffffc0000000000 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff1b13e06 R12: 0000000000000001
R13: 0000000000000000 R14: ffff88802a694690 R15: 0000000000000005
FS: 00007f0e0d6df6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 000000005aa61000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162
__lock_timer+0x28b/0x3b0 kernel/time/posix-timers.c:634
posixtimer_rearm+0x5c/0x340 kernel/time/posix-timers.c:324
dequeue_signal+0x174/0x440 kernel/signal.c:696
get_signal+0x6fe/0x12c0 kernel/signal.c:2781
arch_do_signal_or_restart+0xe7/0x12c0 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:154 [inline]
exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f0e0e07bef7
Code: 83 c8 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
RSP: 002b:00007f0e0d6df0e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f0e0e2e6fa8 RCX: 00007f0e0e07bef9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f0e0e2e6fa8
RBP: 00007f0e0e2e6fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0e0e2e7038 R14: 00007ffd69fe0050 R15: 00007ffd69fe0138
sched: RT throttling activated