rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11632/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=69433, q=535 ncpus=2)
task:syz-executor state:R running task stack:18856 pid:11632 tgid:11632 ppid:11606 task_flags:0x400140 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7145
preempt_schedule+0xae/0xc0 kernel/sched/core.c:7169
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
copy_pte_range mm/memory.c:1201 [inline]
copy_pmd_range+0x68c6/0x71d0 mm/memory.c:1261
copy_pud_range mm/memory.c:1298 [inline]
copy_p4d_range mm/memory.c:1322 [inline]
copy_page_range+0xc14/0x1270 mm/memory.c:1410
dup_mmap+0xf57/0x1ac0 mm/mmap.c:1834
dup_mm kernel/fork.c:1485 [inline]
copy_mm+0x13c/0x4b0 kernel/fork.c:1537
copy_process+0x1706/0x3c00 kernel/fork.c:2175
kernel_clone+0x21e/0x840 kernel/fork.c:2605
__do_sys_clone kernel/fork.c:2748 [inline]
__se_sys_clone kernel/fork.c:2732 [inline]
__x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2732
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0b3db85453
RSP: 002b:00007ffc6ff76828 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0b3db85453
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 000055557d2487d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 0000000000068fe4 R15: 00007ffc6ff769c0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g69433 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=29761
rcu: rcu_preempt kthread starved for 10502 jiffies! g69433 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:27792 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 19339 Comm: syz.6.4524 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:memset+0xf/0x20 arch/x86/lib/memset_64.S:38
Code: 44 88 1f e9 ae a4 96 f5 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 49 89 f9 40 88 f0 48 89 d1 aa 4c 89 c8 e9 82 a4 96 f5 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000a087c0 EFLAGS: 00000002
RAX: fc470caf175cd700 RBX: ffffffff8b8cf2c0 RCX: 0000000000000005
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc90000a087db
RBP: ffffc90000a089b8 R08: ffffc90000a087df R09: ffffc90000a087d0
R10: dffffc0000000000 R11: fffff520001410fc R12: ffff88807b0b1340
R13: dffffc0000000000 R14: 1868a10bc0000000 R15: ffff8880b8727c80
FS: 00007fc7b11ee6c0(0000) GS:ffff888125d1b000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555711f85c8 CR3: 0000000088166000 CR4: 0000000000350ef0
Call Trace:
debug_object_deactivate+0x36/0x250 lib/debugobjects.c:863
debug_hrtimer_deactivate kernel/time/hrtimer.c:450 [inline]
debug_deactivate+0x1d/0x200 kernel/time/hrtimer.c:490
__run_hrtimer kernel/time/hrtimer.c:1729 [inline]
__hrtimer_run_queues+0x2b0/0xc60 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/0x410 arch/x86/kernel/apic/apic.c:1056
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:rcu_do_batch kernel/rcu/tree.c:2543 [inline]
RIP: 0010:rcu_core+0x66d/0x1770 kernel/rcu/tree.c:2861
Code: 05 e8 97 23 7b 00 48 8d 84 24 60 01 00 00 48 89 84 24 68 01 00 00 48 c7 84 24 70 01 00 00 00 00 00 00 48 89 df e8 23 3a 00 00 <84> c0 48 89 5c 24 10 0f 84 2a 01 00 00 48 c7 84 24 20 01 00 00 00
RSP: 0018:ffffc90000a08be0 EFLAGS: 00000202
RAX: ffff8880b873b001 RBX: ffff8880b873b028 RCX: 1ffff110170e7606
RDX: 0000000000000000 RSI: 0000000000002904 RDI: ffff8880b873b028
RBP: ffffc90000a08e30 R08: ffffffff8fa38337 R09: 1ffffffff1f47066
R10: dffffc0000000000 R11: fffffbfff1f47067 R12: dffffc0000000000
R13: 1ffff110170e75f2 R14: ffff8880b873af80 R15: ffffffff8e13f1c0
handle_softirqs+0x286/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline]
sysvec_call_function_single+0xa3/0xc0 arch/x86/kernel/smp.c:266
asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_switch+0x8f/0x130 kernel/kcov.c:351
Code: 00 00 00 41 57 41 56 41 54 53 48 8b 54 24 20 65 4c 8b 04 25 08 50 a0 92 45 31 c9 eb 08 49 ff c1 4c 39 c8 74 77 4e 8b 54 ce 10 <65> 44 8b 1d e9 9e e0 10 41 81 e3 00 01 ff 00 74 13 41 81 fb 00 01
RSP: 0018:ffffc90003e2f448 EFLAGS: 00000216
RAX: 0000000000000020 RBX: ffff88801d69422c RCX: 0000000000000005
RDX: ffffffff81c386c0 RSI: ffffffff8e18f430 RDI: 0000000000000004
RBP: 000000641f73a6a8 R08: ffff88802edd8000 R09: 0000000000000002
R10: 0000000000000002 R11: 0000000000000002 R12: ffff88801d694010
R13: 0000000000000004 R14: 00000000000526a4 R15: 000000000000021c
rb_read_data_buffer+0x110/0x580 kernel/trace/ring_buffer.c:1827
check_buffer+0x28a/0x750 kernel/trace/ring_buffer.c:4394
__rb_reserve_next+0x592/0xdb0 kernel/trace/ring_buffer.c:4493
rb_reserve_next_event kernel/trace/ring_buffer.c:4630 [inline]
ring_buffer_lock_reserve+0xbb5/0x1010 kernel/trace/ring_buffer.c:4689
__trace_buffer_lock_reserve kernel/trace/trace.c:1077 [inline]
trace_event_buffer_lock_reserve+0x1d0/0x6f0 kernel/trace/trace.c:2789
trace_event_buffer_reserve+0x248/0x340 kernel/trace/trace_events.c:672
do_trace_event_raw_event_bpf_trace_printk kernel/trace/bpf_trace.h:11 [inline]
trace_event_raw_event_bpf_trace_printk+0x100/0x260 kernel/trace/bpf_trace.h:11
__do_trace_bpf_trace_printk kernel/trace/bpf_trace.h:11 [inline]
trace_bpf_trace_printk+0x170/0x1d0 kernel/trace/bpf_trace.h:11
____bpf_trace_printk kernel/trace/bpf_trace.c:380 [inline]
bpf_trace_printk+0x11e/0x190 kernel/trace/bpf_trace.c:363
bpf_prog_865f9ec58814c90d+0x4e/0x8f
bpf_dispatcher_nop_func include/linux/bpf.h:1332 [inline]
__bpf_prog_run include/linux/filter.h:718 [inline]
bpf_prog_run include/linux/filter.h:725 [inline]
bpf_prog_run_pin_on_cpu include/linux/filter.h:742 [inline]
bpf_flow_dissect+0x135/0x400 net/core/flow_dissector.c:1024
bpf_prog_test_run_flow_dissector+0x37c/0x5c0 net/bpf/test_run.c:1416
bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4590
__sys_bpf+0x581/0x870 kernel/bpf/syscall.c:6047
__do_sys_bpf kernel/bpf/syscall.c:6139 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6137 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6137
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc7b2f8ebe9
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:00007fc7b11ee038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fc7b31b5fa0 RCX: 00007fc7b2f8ebe9
RDX: 000000000000004c RSI: 0000200000000640 RDI: 000000000000000a
RBP: 00007fc7b3011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc7b31b6038 R14: 00007fc7b31b5fa0 R15: 00007ffe6e9113d8