rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (1 GPs behind) idle=17bc/1/0x4000000000000000 softirq=155037/155038 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P28125/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=128593, q=247 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 28129 Comm: syz.1.7238 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__lock_acquire+0x6c9/0xd20 kernel/locking/lockdep.c:5207
Code: 08 00 00 00 e8 88 25 00 00 45 31 ff 85 c0 0f 84 f5 05 00 00 83 3d c6 66 ff 17 00 75 13 48 63 44 24 20 48 0f a3 05 37 d7 fb 11 <0f> 83 15 05 00 00 31 ed 48 8b 3c 24 4c 8b bf 20 0b 00 00 48 83 7c
RSP: 0018:ffffc90000007b70 EFLAGS: 00000047
RAX: 000000000000006e RBX: 0000000000000006 RCX: ffffffff933a1920
RDX: 0000000000000008 RSI: ffff8880308e8c48 RDI: ffff8880308e8000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81ad37e2
R10: dffffc0000000000 R11: fffffbfff1f3c22f R12: 0000000000000002
R13: 0000000000000002 R14: ffff8880308e8c48 R15: 0000000000000000
FS: 00007f4cb9a476c0(0000) GS:ffff888125d0f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d91eff8 CR3: 000000006c583000 CR4: 0000000000350ef0
Call Trace:
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0xa2/0xf0 kernel/locking/spinlock.c:170
__run_hrtimer kernel/time/hrtimer.c:1781 [inline]
__hrtimer_run_queues+0x602/0xc60 kernel/time/hrtimer.c:1841
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:_compound_head include/linux/page-flags.h:286 [inline]
RIP: 0010:copy_present_ptes mm/memory.c:1124 [inline]
RIP: 0010:copy_pte_range mm/memory.c:1302 [inline]
RIP: 0010:copy_pmd_range+0x8ec/0x7f00 mm/memory.c:1389
Code: 1c 00 00 48 89 44 24 10 4c 8d 70 08 4c 89 f0 48 c1 e8 03 48 89 44 24 50 42 80 3c 20 00 74 08 4c 89 f7 e8 87 36 18 00 49 8b 1e <48> 89 de 48 83 e6 01 31 ff e8 96 8d b2 ff 48 89 d8 48 83 e0 01 4c
RSP: 0018:ffffc90004f673a0 EFLAGS: 00000246
RAX: 1ffffd40002ba549 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000caed000 RSI: 0000000000004d39 RDI: 0000000000004d3a
RBP: ffffc90004f67630 R08: ffff88807629bf63 R09: 1ffff1100ec537ec
R10: dffffc0000000000 R11: ffffed100ec537ed R12: dffffc0000000000
R13: 0000000000000000 R14: ffffea00015d2a48 R15: 00007f4cb76ec000
copy_pud_range mm/memory.c:1426 [inline]
copy_p4d_range mm/memory.c:1450 [inline]
copy_page_range+0xc14/0x1270 mm/memory.c:1538
dup_mmap+0xf4c/0x1b10 mm/mmap.c:1834
dup_mm kernel/fork.c:1489 [inline]
copy_mm+0x13c/0x4b0 kernel/fork.c:1541
copy_process+0x1706/0x3c00 kernel/fork.c:2181
kernel_clone+0x21e/0x840 kernel/fork.c:2609
__do_sys_clone kernel/fork.c:2750 [inline]
__se_sys_clone kernel/fork.c:2734 [inline]
__x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2734
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4cb8b8eec9
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:00007f4cb9a46fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f4cb8de5fa0 RCX: 00007f4cb8b8eec9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040001400
RBP: 00007f4cb8c11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f4cb8de6038 R14: 00007f4cb8de5fa0 R15: 00007ffc00e5f7b8
task:syz.5.7235 state:R running task stack:22792 pid:28125 tgid:28124 ppid:14221 task_flags:0x400040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7256
irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:118 [inline]
RIP: 0010:lock_acquire+0x94/0x360 kernel/locking/lockdep.c:5844
Code: 0f 84 d7 01 00 00 83 3d 59 5f 01 0e 00 0f 84 f0 00 00 00 48 8b b4 24 90 00 00 00 4c 89 ef e8 73 34 88 00 83 3d 3c 5f 01 0e 00 <0f> 84 fa 00 00 00 65 8b 05 0f 6e f4 10 85 c0 0f 85 eb 00 00 00 65
RSP: 0018:ffffc9000b48ef98 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: f6062f1776069600
RDX: 0000000000000000 RSI: ffffffff81731d42 RDI: 1ffffffff1c27a64
RBP: ffffffff81731d25 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff81abbce0 R12: 0000000000000002
R13: ffffffff8e13d320 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:867 [inline]
class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
save_stack+0xf5/0x1f0 mm/page_owner.c:156
__set_page_owner+0x8d/0x4a0 mm/page_owner.c:329
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850
prep_new_page mm/page_alloc.c:1858 [inline]
get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
folio_alloc_mpol_noprof+0x39/0x70 mm/mempolicy.c:2435
shmem_alloc_folio mm/shmem.c:1871 [inline]
shmem_alloc_and_add_folio+0x447/0xf60 mm/shmem.c:1910
shmem_get_folio_gfp+0x59d/0x1660 mm/shmem.c:2533
shmem_get_folio mm/shmem.c:2639 [inline]
shmem_write_begin+0xf7/0x2b0 mm/shmem.c:3289
generic_perform_write+0x2c5/0x900 mm/filemap.c:4242
shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3464
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x5c9/0xb30 fs/read_write.c:686
ksys_write+0x145/0x250 fs/read_write.c:738
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcb0878d97f
RSP: 002b:00007fcb095d3df0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007fcb0878d97f
RDX: 0000000001000000 RSI: 00007fcafe400000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000000055a8
R10: 0000000000000002 R11: 0000000000000293 R12: 0000000000000003
R13: 00007fcb095d3ef0 R14: 00007fcb095d3eb0 R15: 00007fcafe400000
rcu: rcu_preempt kthread starved for 10502 jiffies! g128593 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:27304 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7026
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+0x4bc/0x870 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:
CPU: 1 UID: 0 PID: 28132 Comm: syz.3.7239 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:native_pause arch/x86/include/asm/vdso/processor.h:13 [inline]
RIP: 0010:cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline]
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xd31/0x12d0 kernel/smp.c:877
Code: 00 00 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 96 73 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 41 6f 0b 00 eb 38 90 42 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8
RSP: 0018:ffffc9000b697a80 EFLAGS: 00000246
RAX: ffffffff81b424db RBX: 1ffff110170c8441 RCX: 0000000000080000
RDX: ffffc9000fa05000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000b697bf0 R08: ffffffff8f9e1177 R09: 1ffffffff1f3c22e
R10: dffffc0000000000 R11: ffffffff81708180 R12: ffff8880b8642208
R13: dffffc0000000000 R14: ffff8880b873b240 R15: 0000000000000000
FS: 00007ff4509666c0(0000) GS:ffff888125e0f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003038 CR3: 0000000032664000 CR4: 0000000000350ef0
Call Trace:
clock_was_set+0x709/0x7c0 kernel/time/hrtimer.c:969
do_settimeofday64+0x3cb/0x5a0 kernel/time/timekeeping.c:1460
__do_sys_clock_settime kernel/time/posix-timers.c:1131 [inline]
__se_sys_clock_settime kernel/time/posix-timers.c:1115 [inline]
__x64_sys_clock_settime+0x24f/0x290 kernel/time/posix-timers.c:1115
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff44fb8eec9
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:00007ff450966038 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007ff44fde5fa0 RCX: 00007ff44fb8eec9
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000000
RBP: 00007ff44fc11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff44fde6038 R14: 00007ff44fde5fa0 R15: 00007ffdf4d442c8