rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=215c/1/0x4000000000000000 softirq=26579/26580 fqs=5
rcu: (detected by 0, t=10502 jiffies, g=23793, q=238 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8328 Comm: syz.7.618 Not tainted 6.14.0-rc6-syzkaller-00244-g31d7109a19f6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:rcu_is_watching+0x67/0xb0 kernel/rcu/tree.c:717
Code: 89 f7 e8 bc 52 7f 00 48 c7 c3 98 79 03 00 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 22 8b 03 65 ff 0d 31 96 5c 7e <74> 10 83 e0 04 c1 e8 02 5b 41 5e 41 5f c3 cc cc cc cc e8 f2 ff 82
RSP: 0018:ffffc90000a28a00 EFLAGS: 00000086
RAX: 000000000027215c RBX: ffff8880b8737998 RCX: ffffffff819cd334
RDX: 0000000000000000 RSI: ffffffff8c802e40 RDI: ffffffff8c802e00
RBP: ffffc90000a28b68 R08: ffffffff903bd477 R09: 1ffffffff2077a8e
R10: dffffc0000000000 R11: fffffbfff2077a8f R12: 1ffff9200014514c
R13: dffffc0000000000 R14: ffffffff8e53eb58 R15: dffffc0000000000
FS: 00007f5daa7f66c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e118ff8 CR3: 000000002fcd0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
trace_lock_acquire include/trace/events/lock.h:24 [inline]
lock_acquire+0xe3/0x550 kernel/locking/lockdep.c:5822
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
debug_object_deactivate+0x158/0x390 lib/debugobjects.c:873
debug_hrtimer_deactivate kernel/time/hrtimer.c:460 [inline]
debug_deactivate+0x1b/0x220 kernel/time/hrtimer.c:502
__run_hrtimer kernel/time/hrtimer.c:1769 [inline]
__hrtimer_run_queues+0x305/0xd30 kernel/time/hrtimer.c:1865
hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1927
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:finish_task_switch+0x1ea/0x870 kernel/sched/core.c:5252
Code: c9 50 e8 59 2e 0c 00 48 83 c4 08 4c 89 f7 e8 fd 39 00 00 e9 de 04 00 00 4c 89 f7 e8 30 11 73 0a e8 6b 08 39 00 fb 48 8b 5d c0 <48> 8d bb 08 16 00 00 48 89 f8 48 c1 e8 03 49 be 00 00 00 00 00 fc
RSP: 0018:ffffc9000c59f7a8 EFLAGS: 00000286
RAX: 4ef584321af06f00 RBX: ffff88806aeada00 RCX: ffffffff9a61e903
RDX: dffffc0000000000 RSI: ffffffff8c2ab3a0 RDI: ffffffff8c802e60
RBP: ffffc9000c59f7f0 R08: ffffffff903bd477 R09: 1ffffffff2077a8e
R10: dffffc0000000000 R11: fffffbfff2077a8f R12: 1ffff110170e7ebe
R13: dffffc0000000000 R14: ffff8880b863e7c0 R15: ffff8880b873f5f0
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x18c4/0x4c40 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6857
futex_wait_queue+0x159/0x1e0 kernel/futex/waitwake.c:369
__futex_wait+0x17f/0x320 kernel/futex/waitwake.c:668
futex_wait+0x101/0x360 kernel/futex/waitwake.c:696
do_futex+0x33b/0x560 kernel/futex/syscalls.c:102
__do_sys_futex kernel/futex/syscalls.c:179 [inline]
__se_sys_futex+0x3f9/0x480 kernel/futex/syscalls.c:160
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5dac98d169
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:00007f5daa7f60e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f5dacba6088 RCX: 00007f5dac98d169
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f5dacba6088
RBP: 00007f5dacba6080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5dacba608c
R13: 0000000000000000 R14: 00007ffc57a2dc90 R15: 00007ffc57a2dd78
rcu: rcu_preempt kthread starved for 10492 jiffies! g23793 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:26104 pid:18 tgid:18 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0x18bc/0x4c40 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6857
schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2024
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2226
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 6134 Comm: syz-executor Not tainted 6.14.0-rc6-syzkaller-00244-g31d7109a19f6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0x1ba4/0x2d30 kernel/smp.c:885
Code: 03 84 c0 75 7e 45 8b 65 00 44 89 e6 83 e6 01 31 ff e8 c0 f4 0b 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 70 f0 0b 00 eb 41 f3 90 <48> b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 75 11 41 f7 45 00
RSP: 0018:ffffc90002e9f500 EFLAGS: 00000293
RAX: ffffffff81b5ef25 RBX: 1ffff110170e88c9 RCX: ffff8880236dda00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90002e9f700 R08: ffffffff81b5eef0 R09: 1ffffffff28a2f0e
R10: dffffc0000000000 R11: fffffbfff28a2f0f R12: ffff8880b863f9c8
R13: ffff8880b8744648 R14: ffff8880b863f9c0 R15: 0000000000000001
FS: 0000555574826500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbcd3ad56c0 CR3: 0000000061098000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
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:966 [inline]
flush_tlb_mm_range+0x42d/0x710 arch/x86/mm/tlb.c:1054
dup_mmap kernel/fork.c:787 [inline]
dup_mm kernel/fork.c:1700 [inline]
copy_mm+0x18af/0x2160 kernel/fork.c:1752
copy_process+0x17d1/0x3cf0 kernel/fork.c:2403
kernel_clone+0x223/0x870 kernel/fork.c:2815
__do_sys_clone kernel/fork.c:2958 [inline]
__se_sys_clone kernel/fork.c:2942 [inline]
__x64_sys_clone+0x267/0x2e0 kernel/fork.c:2942
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbcd2d839d3
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007fffa7f66f68 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbcd2d839d3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 00005555748267d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 0000000000046e1d R15: 00007fffa7f67100