rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=337c/1/0x4000000000000000 softirq=67932/67935 fqs=1
rcu: (detected by 0, t=10505 jiffies, g=59781, q=259 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 14098 Comm: syz.0.2050 Not tainted 6.16.0-syzkaller-11489-gd2eedaa3909b #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:check_preemption_disabled+0x25/0xe0 lib/smp_processor_id.c:54
Code: 90 90 90 90 90 41 54 55 53 48 83 ec 08 65 8b 1d 75 fc 42 08 65 8b 05 6a fc 42 08 a9 ff ff ff 7f 74 0f 48 83 c4 08 89 d8 5b 5d <41> 5c e9 04 f1 02 00 9c 58 f6 c4 02 74 ea 48 89 fd 65 48 8b 05 2a
RSP: 0018:ffffc90000a08c80 EFLAGS: 00000092
RAX: 0000000000000001 RBX: ffffffff9b07b150 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8df3fe84 RDI: ffffffff8c160580
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff9b07b138 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f2e668046c0(0000) GS:ffff8881247c6000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2e65b65b10 CR3: 0000000043b7d000 CR4: 00000000003526f0
Call Trace:
lockdep_recursion_inc kernel/locking/lockdep.c:465 [inline]
lock_acquire kernel/locking/lockdep.c:5867 [inline]
lock_acquire+0x140/0x350 kernel/locking/lockdep.c:5825
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
debug_object_activate+0x14c/0x4c0 lib/debugobjects.c:818
debug_hrtimer_activate kernel/time/hrtimer.c:445 [inline]
debug_activate kernel/time/hrtimer.c:484 [inline]
enqueue_hrtimer+0x23/0x3b0 kernel/time/hrtimer.c:1088
__run_hrtimer kernel/time/hrtimer.c:1778 [inline]
__hrtimer_run_queues+0x8ff/0xad0 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x3f0 arch/x86/kernel/apic/apic.c:1056
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lockdep_init_map_type+0x40/0x280 kernel/locking/lockdep.c:4960
Code: fb 8b 44 24 20 48 c7 47 08 00 00 00 00 48 c7 47 10 00 00 00 00 85 d2 0f 85 df 00 00 00 48 85 f6 0f 84 56 01 00 00 48 89 77 18 <44> 88 4f 20 44 88 47 21 88 47 22 48 85 ed 0f 84 7b 01 00 00 48 89
RSP: 0018:ffffc900036a7cc8 EFLAGS: 00000286
RAX: 0000000000000000 RBX: ffff888030803af0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8bad5560 RDI: ffff888030803af0
RBP: ffffffff93dc6480 R08: 0000000000000002 R09: 0000000000000000
R10: ffff888030803ad7 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000002 R14: 0000000000000002 R15: ffffffff9041e8f0
lockdep_init_map_waits include/linux/lockdep.h:135 [inline]
lockdep_init_map_wait include/linux/lockdep.h:142 [inline]
__raw_spin_lock_init+0x3a/0x110 kernel/locking/spinlock_debug.c:25
__mutex_init+0x5f/0x120 kernel/locking/mutex.c:50
init_file+0xe0/0x4c0 fs/file_table.c:173
alloc_empty_file+0x73/0x1e0 fs/file_table.c:241
alloc_file fs/file_table.c:354 [inline]
alloc_file_pseudo+0x13a/0x230 fs/file_table.c:383
sock_alloc_file+0x50/0x210 net/socket.c:470
sock_map_fd net/socket.c:500 [inline]
__sys_socket+0x1c0/0x260 net/socket.c:1740
__do_sys_socket net/socket.c:1745 [inline]
__se_sys_socket net/socket.c:1743 [inline]
__x64_sys_socket+0x72/0xb0 net/socket.c:1743
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2e6598eb69
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:00007f2e66803fd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 000000000000000a RCX: 00007f2e6598eb69
RDX: 0000000000000010 RSI: 0000000000000003 RDI: 0000000000000010
RBP: 00007f2e65a11df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f2e65bb6240 R15: 00007ffcebf2daa8
rcu: rcu_preempt kthread starved for 10500 jiffies! g59781 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:27888 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7058
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2285
kthread+0x3c2/0x780 kernel/kthread.c:463
ret_from_fork+0x5d7/0x6f0 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:
CPU: 0 UID: 0 PID: 14099 Comm: syz.6.2052 Not tainted 6.16.0-syzkaller-11489-gd2eedaa3909b #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xdfd/0x1600 kernel/smp.c:877
Code: 57 48 8b 54 24 10 4c 89 74 24 10 49 89 d5 48 89 d5 48 89 54 24 18 49 c1 ed 03 83 e5 07 4d 01 e5 83 c5 03 e8 05 05 0c 00 f3 90 <41> 0f b6 45 00 40 38 c5 7c 08 84 c0 0f 85 e0 05 00 00 8b 43 08 31
RSP: 0018:ffffc90003547398 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b853fe80 RCX: ffffffff81af8d91
RDX: ffff88803028a440 RSI: ffffffff81af8d6b RDI: 0000000000000005
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffed10170a7fd1 R14: 0000000000000001 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8881246c6000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000339000 CR3: 000000006bb7b000 CR4: 00000000003526f0
Call Trace:
on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1044
__flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
flush_tlb_mm_range+0x4a0/0x17a0 arch/x86/mm/tlb.c:1451
tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:490 [inline]
tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:480 [inline]
zap_pte_range mm/memory.c:1753 [inline]
zap_pmd_range mm/memory.c:1818 [inline]
zap_pud_range mm/memory.c:1847 [inline]
zap_p4d_range mm/memory.c:1868 [inline]
unmap_page_range+0x20b2/0x42c0 mm/memory.c:1889
unmap_single_vma.constprop.0+0x153/0x240 mm/memory.c:1932
unmap_vmas+0x218/0x470 mm/memory.c:1976
exit_mmap+0x1b9/0xb90 mm/mmap.c:1280
__mmput+0x12a/0x410 kernel/fork.c:1126
mmput+0x62/0x70 kernel/fork.c:1149
exit_mm kernel/exit.c:582 [inline]
do_exit+0x7c7/0x2bf0 kernel/exit.c:949
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
get_signal+0x2673/0x26d0 kernel/signal.c:3034
arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x84/0x110 kernel/entry/common.c:40
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6c63d8eb69
Code: Unable to access opcode bytes at 0x7f6c63d8eb3f.
RSP: 002b:00007fff1c895be8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 00000000000b428e RCX: 00007f6c63d8eb69
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f6c63fb5fac
RBP: 0000000000000226 R08: 00007f6c64c25000 R09: 000000011c895edf
R10: 00007fff1c895ce0 R11: 0000000000000246 R12: 00007f6c63fb5fac
R13: 00007fff1c895ce0 R14: 00000000000b44b4 R15: 00007fff1c895d00