rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P17803/1:b..l
rcu: (detected by 0, t=10505 jiffies, g=116549, q=270 ncpus=2)
task:syz.0.3896 state:R running task stack:25784 pid:17803 tgid:17802 ppid:5611 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1295/0x67a0 kernel/sched/core.c:7189
preempt_schedule_common+0x42/0xc0 kernel/sched/core.c:7370
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline]
_raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:190
spin_unlock include/linux/spinlock.h:390 [inline]
wp_page_copy mm/memory.c:3960 [inline]
do_wp_page+0x13d2/0x4350 mm/memory.c:4320
handle_pte_fault mm/memory.c:6427 [inline]
__handle_mm_fault+0x1ab6/0x2a00 mm/memory.c:6549
handle_mm_fault+0x36d/0xa20 mm/memory.c:6718
do_user_addr_fault+0x74c/0x12f0 arch/x86/mm/fault.c:1385
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0010:rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:74
Code: 9b 04 00 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb c5 a4 c3 cc cc cc cc 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48
RSP: 0018:ffffc9000764f920 EFLAGS: 00050206
RAX: 0000000000000001 RBX: 0000000000001000 RCX: 0000000000000e80
RDX: 0000000000000001 RSI: ffff8880140f5180 RDI: 0000200000381000
RBP: ffffc9000764fd30 R08: 0000000000000000 R09: ffffed100281ebff
R10: ffff8880140f5fff R11: 0000000000000000 R12: ffff8880140f5000
R13: 0000000000380b80 R14: 0000200000380e80 R15: 0000000000001000
copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline]
raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline]
copy_to_user_iter lib/iov_iter.c:25 [inline]
iterate_iovec include/linux/iov_iter.h:52 [inline]
iterate_and_advance2 include/linux/iov_iter.h:304 [inline]
iterate_and_advance include/linux/iov_iter.h:330 [inline]
_copy_to_iter+0x4c5/0x1720 lib/iov_iter.c:197
copy_page_to_iter lib/iov_iter.c:374 [inline]
copy_page_to_iter+0x285/0x370 lib/iov_iter.c:361
process_vm_rw_pages mm/process_vm_access.c:45 [inline]
process_vm_rw_single_vec mm/process_vm_access.c:118 [inline]
process_vm_rw_core.constprop.0+0x5a3/0x950 mm/process_vm_access.c:216
process_vm_rw+0x309/0x370 mm/process_vm_access.c:284
__do_sys_process_vm_readv mm/process_vm_access.c:296 [inline]
__se_sys_process_vm_readv mm/process_vm_access.c:292 [inline]
__x64_sys_process_vm_readv+0xe2/0x1c0 mm/process_vm_access.c:292
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f757379ce59
RSP: 002b:00007f75745d0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000136
RAX: ffffffffffffffda RBX: 00007f7573a15fa0 RCX: 00007f757379ce59
RDX: 0000000000000002 RSI: 0000200000008400 RDI: 0000000000000879
RBP: 00007f7573832d6f R08: 0000000000000286 R09: 0000000000000000
R10: 0000200000008640 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7573a16038 R14: 00007f7573a15fa0 R15: 00007ffd30b0e478
rcu: rcu_preempt kthread timer wakeup didn't happen for 10500 jiffies! g116549 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=47764
rcu: rcu_preempt kthread starved for 10501 jiffies! g116549 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:27992 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1295/0x67a0 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7283
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
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: 17827 Comm: syz.1.3901 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:arch_irqs_disabled_flags arch/x86/include/asm/irqflags.h:146 [inline]
RIP: 0010:lock_acquire kernel/locking/lockdep.c:5869 [inline]
RIP: 0010:lock_acquire+0x187/0x370 kernel/locking/lockdep.c:5825
Code: 9c 8f 04 24 fa 48 c7 c7 e8 3a 01 8e e8 02 6a a6 09 45 89 e8 44 89 e1 89 da 65 ff 05 4b e8 26 12 4c 8b 14 24 44 89 f6 48 89 ef <41> 81 e2 00 02 00 00 4c 89 14 24 4d 89 d1 6a 00 49 c1 e9 09 6a 00
RSP: 0018:ffffc90000a08d10 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff9b3ef7b8
RBP: ffffffff9b3ef7b8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000046 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f6ad78be6c0(0000) GS:ffff88812446d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3361bff8 CR3: 0000000052001000 CR4: 00000000003526f0
Call Trace:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166
debug_object_deactivate+0x135/0x3b0 lib/debugobjects.c:890
debug_hrtimer_deactivate kernel/time/hrtimer.c:490 [inline]
__run_hrtimer kernel/time/hrtimer.c:1898 [inline]
__hrtimer_run_queues+0x2f0/0xa00 kernel/time/hrtimer.c:1994
hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2113
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x460 arch/x86/kernel/apic/apic.c:1067
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:percpu_down_read_internal include/linux/percpu-rwsem.h:72 [inline]
RIP: 0010:percpu_down_read include/linux/percpu-rwsem.h:77 [inline]
RIP: 0010:cpus_read_lock+0x8c/0x170 kernel/cpu.c:490
Code: 1a f4 41 00 8b 1d 34 0b a1 0c 31 ff 89 de e8 bb ee 41 00 85 db 0f 85 bd 00 00 00 e8 fe f3 41 00 48 8b 05 7f 0b a1 0c 65 ff 00 ef f3 41 00 bf 01 00 00 00 e8 95 f1 0d 00 65 8b 1d 0e 75 44 12
RSP: 0018:ffffc900031dfc90 EFLAGS: 00000203
RAX: ffffffff940b72e0 RBX: 0000000000000000 RCX: ffffc90007181000
RDX: 0000000000080000 RSI: ffffffff81c6bb02 RDI: ffff888059014a00
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff9200063bfb6
R13: 1ffff9200063bf9f R14: 000000000d2b5132 R15: 0000000000000000
class_cpus_read_lock_constructor include/linux/cpuhplock.h:48 [inline]
clock_was_set+0x96/0x870 kernel/time/hrtimer.c:988
do_settimeofday64+0x330/0x4d0 kernel/time/timekeeping.c:1603
do_sys_settimeofday64+0x1dc/0x260 kernel/time/time.c:195
__do_sys_clock_settime kernel/time/posix-timers.c:1124 [inline]
__se_sys_clock_settime kernel/time/posix-timers.c:1108 [inline]
__x64_sys_clock_settime+0x1c1/0x2a0 kernel/time/posix-timers.c:1108
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6ad699ce59
Code: 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 01 48
RSP: 002b:00007f6ad78be028 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007f6ad6c16090 RCX: 00007f6ad699ce59
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000000
RBP: 00007f6ad6a32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6ad6c16128 R14: 00007f6ad6c16090 R15: 00007ffccf5507c8