rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5698/1:b..l
(detected by 1, t=10505 jiffies, g=12345, q=1554)
task:syz.4.370 state:R running task stack:24512 pid: 5698 ppid: 4191 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11bb/0x4390 kernel/sched/core.c:6395
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6799
irqentry_exit+0x63/0x70 kernel/entry/common.c:432
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:bpf_test_run+0x1ae/0x7d0 net/bpf/test_run.c:115
Code: 48 89 44 24 68 48 c1 e8 03 48 89 44 24 70 44 89 7c 24 1c 4c 89 64 24 30 48 8b 5c 24 20 4c 89 6c 24 40 48 8b 84 24 98 00 00 00 <42> 80 3c 30 00 74 0d 48 8d bc 24 20 01 00 00 e8 be dc ab f9 48 8d
RSP: 0018:ffffc9000345faa0 EFLAGS: 00000283
RAX: 1ffff9200068bf78 RBX: ffffc9000345fc9c RCX: 0000000000080000
RDX: ffffc9000e58a000 RSI: 000000000001de45 RDI: 000000000001de46
RBP: ffffc9000345fc30 R08: dffffc0000000000 R09: ffffed100426eb29
R10: ffffed100426eb29 R11: 1ffff1100426eb28 R12: ffffc9000345fc98
R13: ffffc90000d7e030 R14: dffffc0000000000 R15: 0000000000000001
bpf_prog_test_run_xdp+0x3fc/0x920 net/bpf/test_run.c:812
bpf_prog_test_run+0x31e/0x390 kernel/bpf/syscall.c:3374
__sys_bpf+0x535/0x670 kernel/bpf/syscall.c:4675
__do_sys_bpf kernel/bpf/syscall.c:4761 [inline]
__se_sys_bpf kernel/bpf/syscall.c:4759 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759
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: 0033:0x7f759887aba9
RSP: 002b:00007f7596ae2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f7598ac1fa0 RCX: 00007f759887aba9
RDX: 0000000000000050 RSI: 0000200000000600 RDI: 000000000000000a
RBP: 00007f75988fde19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7598ac2038 R14: 00007f7598ac1fa0 R15: 00007fff31848af8
rcu: rcu_preempt kthread timer wakeup didn't happen for 10500 jiffies! g12345 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=6973
rcu: rcu_preempt kthread starved for 10501 jiffies! g12345 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:27904 pid: 15 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11bb/0x4390 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
rcu_gp_kthread+0x98/0x350 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: 5695 Comm: syz.3.369 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:task_wait_context kernel/locking/lockdep.c:4626 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4707 [inline]
RIP: 0010:__lock_acquire+0x867/0x7c60 kernel/locking/lockdep.c:4962
Code: 7e 41 b5 02 85 c0 48 8b 5c 24 40 4c 8b bc 24 98 00 00 00 75 24 48 8b 84 24 c0 00 00 00 42 0f b6 04 00 84 c0 0f 85 3c 64 00 00 <41> 83 3f 00 41 0f 94 c5 45 00 ed 41 80 c5 02 48 8b 84 24 88 00 00
RSP: 0018:ffffc9000304f2c0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff88802bda0ae8 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8ffbc0c0
RBP: ffffc9000304f510 R08: dffffc0000000000 R09: fffffbfff1ff7819
R10: fffffbfff1ff7819 R11: 1ffffffff1ff7818 R12: 0000000000000000
R13: ffff88802bda0b02 R14: 0000000000000000 R15: ffff88802bda0ad4
FS: 000055558948c500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f41694610e8 CR3: 000000005f437000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:312
rcu_read_lock include/linux/rcupdate.h:739 [inline]
__perf_event_output kernel/events/core.c:7800 [inline]
perf_event_output_forward+0x9e/0x280 kernel/events/core.c:7822
__perf_event_overflow+0x364/0x530 kernel/events/core.c:9515
perf_tp_event+0x32c/0xb50 kernel/events/core.c:10047
perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
perf_trace_preemptirq_template+0x2be/0x380 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+0x84/0x480 kernel/rcu/tree_plugin.h:674
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 ad 13 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc9000304fcc0 EFLAGS: 00000206
RAX: 73c52da2288c7200 RBX: 1ffff92000609f9c RCX: 73c52da2288c7200
RDX: dffffc0000000000 RSI: ffffffff8a0b1820 RDI: ffffffff8a59a480
RBP: ffffc9000304fd88 R08: dffffc0000000000 R09: fffffbfff1ff781a
R10: fffffbfff1ff781a R11: 1ffffffff1ff7819 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000246 R15: ffffffff8c120ba0
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
rcu_read_unlock+0x85/0x90 include/linux/rcupdate.h:771
dput+0xc0/0x1a0 fs/dcache.c:886
__fput+0x5ee/0x930 fs/file_table.c:319
task_work_run+0x125/0x1a0 kernel/task_work.c:188
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181
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: 0033:0x7f43c73d2ba9
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:00007ffcd1818eb8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f43c761bda0 RCX: 00007f43c73d2ba9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f43c761bda0 R08: 0000000000000170 R09: 0000001414aaac04
R10: 00000000003ffc6c R11: 0000000000000246 R12: 0000000000018dcc
R13: 00007f43c7619fa0 R14: ffffffffffffffff R15: 00007ffcd1818fd0