rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=278c/1/0x4000000000000000 softirq=38004/38018 fqs=1
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P9388/1:b..l P8458/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=30169, q=549 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 9399 Comm: syz.2.1062 Not tainted 6.15.0-rc1-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:lookup_object lib/debugobjects.c:-1 [inline]
RIP: 0010:lookup_object_or_alloc lib/debugobjects.c:662 [inline]
RIP: 0010:debug_object_activate+0x195/0x5c0 lib/debugobjects.c:820
Code: e9 2f 83 e1 f8 48 8d 1c c9 48 81 c3 e0 4f 90 9a 48 8d 3c c9 48 81 c7 e8 4f 90 9a 48 89 7c 24 10 e8 40 22 27 07 48 89 44 24 08 <48> 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 15 62 21 fd
RSP: 0018:ffffc90000a08be0 EFLAGS: 00000046
RAX: 0000000000000046 RBX: ffffffff9a942840 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffc90000a08ac0
RBP: ffffc90000a08cf8 R08: 0000000000000003 R09: fffff52000141158
R10: dffffc0000000000 R11: fffff52000141158 R12: ffff88805a2fe340
R13: 0000000000000000 R14: dffffc0000000000 R15: ffffffff9368a020
FS: 0000000000000000(0000) GS:ffff888125096000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003c80 CR3: 00000000790c6000 CR4: 0000000000350ef0
Call Trace:
debug_hrtimer_activate kernel/time/hrtimer.c:445 [inline]
debug_activate kernel/time/hrtimer.c:484 [inline]
enqueue_hrtimer+0x30/0x3c0 kernel/time/hrtimer.c:1088
__run_hrtimer kernel/time/hrtimer.c:1778 [inline]
__hrtimer_run_queues+0x6d6/0xd40 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x112/0x420 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:rcu_read_lock_sched include/linux/rcupdate.h:933 [inline]
RIP: 0010:pfn_valid+0x117/0x450 include/linux/mmzone.h:2116
Code: 57 ff 4c 8d 35 00 00 00 00 48 c7 c7 60 df d3 8e 31 f6 31 d2 b9 02 00 00 00 45 31 c0 45 31 c9 41 56 e8 3d 82 65 ff 48 83 c4 08 f4 1c f7 09 89 c5 31 ff 89 c6 e8 59 ed 89 ff 85 ed 74 1a e8 00
RSP: 0018:ffffc90012c77410 EFLAGS: 00000292
RAX: 056d07e81e481a00 RBX: 0000000000000180 RCX: 056d07e81e481a00
RDX: 0000000000000000 RSI: ffffffff8e4fd4cc RDI: ffffffff8ca1b620
RBP: ffff88823ffef400 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000061277 R14: ffffffff82396bd6 R15: ffff88813fffa580
page_table_check_clear+0x21/0x6f0 mm/page_table_check.c:70
ptep_get_and_clear_full arch/x86/include/asm/jump_label.h:-1 [inline]
get_and_clear_full_ptes include/linux/pgtable.h:714 [inline]
zap_present_folio_ptes mm/memory.c:1501 [inline]
zap_present_ptes mm/memory.c:1586 [inline]
do_zap_pte_range mm/memory.c:1687 [inline]
zap_pte_range mm/memory.c:1731 [inline]
zap_pmd_range mm/memory.c:1823 [inline]
zap_pud_range mm/memory.c:1852 [inline]
zap_p4d_range mm/memory.c:1873 [inline]
unmap_page_range+0x33cf/0x44d0 mm/memory.c:1894
unmap_vmas+0x3ce/0x5f0 mm/memory.c:1984
exit_mmap+0x2bc/0xde0 mm/mmap.c:1284
__mmput+0x115/0x420 kernel/fork.c:1379
exit_mm+0x221/0x310 kernel/exit.c:589
do_exit+0x994/0x27f0 kernel/exit.c:940
do_group_exit+0x207/0x2c0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1111
x64_sys_call+0x26c3/0x26d0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb6d5f8d169
Code: Unable to access opcode bytes at 0x7fb6d5f8d13f.
RSP: 002b:00007fff6d362778 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb6d5f8d169
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff6d3627dc R08: 000000046d36286f R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 00000000000000c0
R13: 00000000000927c0 R14: 0000000000041018 R15: 00007fff6d362830
task:syz-executor state:R running task stack:21064 pid:8458 tgid:8458 ppid:8437 task_flags:0x400140 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b88/0x5240 kernel/sched/core.c:6767
preempt_schedule_irq+0xfe/0x1c0 kernel/sched/core.c:7090
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lookup_page_ext mm/page_ext.c:254 [inline]
RIP: 0010:page_ext_lookup+0xef/0x150 mm/page_ext.c:520
Code: 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 f6 3a f4 ff 4c 8b 33 e8 de 2b 6e ff 89 c3 31 ff 89 c6 e8 03 16 8a ff 85 db <74> 52 e8 ba 11 8a ff 44 89 f3 83 e3 01 31 ff 48 89 de e8 8a 16 8a
RSP: 0018:ffffc9000ac67410 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000080000000
RDX: ffff8880275f0000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff8239435d R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: 00000000000365d0 R14: ffff88801bd00000 R15: 00000000000365d0
page_ext_iter_begin include/linux/page_ext.h:132 [inline]
__page_table_check_zero+0x16c/0x510 mm/page_table_check.c:139
page_table_check_free include/linux/page_table_check.h:41 [inline]
free_pages_prepare mm/page_alloc.c:1263 [inline]
free_unref_folios+0xe22/0x17f0 mm/page_alloc.c:2737
folios_put_refs+0x70a/0x800 mm/swap.c:992
folio_batch_release include/linux/pagevec.h:101 [inline]
shmem_undo_range+0x595/0x1820 mm/shmem.c:1125
shmem_truncate_range mm/shmem.c:1237 [inline]
shmem_evict_inode+0x29d/0xa80 mm/shmem.c:1365
evict+0x4fb/0x9b0 fs/inode.c:810
__dentry_kill+0x20d/0x630 fs/dcache.c:660
dput+0x19f/0x2b0 fs/dcache.c:902
__fput+0x60b/0x9f0 fs/file_table.c:473
task_work_run+0x253/0x310 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f53df58bdca
RSP: 002b:00007ffcb537a1a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f53df58bdca
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007ffcb537a1fc R08: 0000000000000000 R09: 00007ffcb5379f07
R10: 0000000000000000 R11: 0000000000000293 R12: 000000000000002e
R13: 00000000000927c0 R14: 0000000000040fc1 R15: 00007ffcb537a250
task:syz.7.1059 state:R running task stack:24936 pid:9388 tgid:9388 ppid:6744 task_flags:0x40004c flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b88/0x5240 kernel/sched/core.c:6767
preempt_schedule_irq+0xfe/0x1c0 kernel/sched/core.c:7090
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__rcu_read_unlock+0x0/0x110 kernel/rcu/tree_plugin.h:431
Code: ab 44 89 f9 80 e1 07 80 c1 03 38 c1 7c aa 4c 89 ff e8 14 fc 83 00 eb a0 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 41 57 41 56 41 55 41 54 53 49 bc 00 00 00 00 00 fc
RSP: 0018:ffffc9000b84f2c0 EFLAGS: 00000286
RAX: 005d268c49d7e100 RBX: ffffc9000b84f400 RCX: 0000000000000002
RDX: dffffc0000000000 RSI: ffffffff8e4fd4cc RDI: ffffffff8ca1b620
RBP: dffffc0000000001 R08: ffffc9000b84f3f0 R09: ffffc9000b84f450
R10: dffffc0000000000 R11: fffff52001709e8c R12: ffffc9000b84f410
R13: dffffc0000000000 R14: ffffc9000b84f400 R15: ffffffff816dfbc8
rcu_read_unlock include/linux/rcupdate.h:873 [inline]
class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0x1aa4/0x23b0 arch/x86/kernel/unwind_orc.c:680
__unwind_start+0x59a/0x740 arch/x86/kernel/unwind_orc.c:758
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0xe7/0x150 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x11a/0x1d0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2389 [inline]
slab_free mm/slub.c:4646 [inline]
kmem_cache_free+0x197/0x410 mm/slub.c:4748
anon_vma_chain_free mm/rmap.c:147 [inline]
unlink_anon_vmas+0x297/0x5f0 mm/rmap.c:421
free_pgtables+0x44e/0x6f0 mm/memory.c:391
exit_mmap+0x5a9/0xde0 mm/mmap.c:1295
__mmput+0x115/0x420 kernel/fork.c:1379
exit_mm+0x221/0x310 kernel/exit.c:589
do_exit+0x994/0x27f0 kernel/exit.c:940
do_group_exit+0x207/0x2c0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1111
x64_sys_call+0x26c3/0x26d0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f67c438d169
RSP: 002b:00007ffdc1614e38 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f67c438d169
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffdc1614e9c R08: 00000004c1614f2f R09: 00000000000927c0
R10: 00000000000023c4 R11: 0000000000000246 R12: 000000000000008b
R13: 00000000000927c0 R14: 0000000000040e4f R15: 00007ffdc1614ef0
rcu: rcu_preempt kthread starved for 10500 jiffies! g30169 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:26952 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b88/0x5240 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6860
schedule_timeout+0x15b/0x2b0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x2e1/0x1340 kernel/rcu/tree.c:2046
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2248
kthread+0x7b9/0x940 kernel/kthread.c:464
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:153
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: 63 Comm: kworker/u8:4 Not tainted 6.15.0-rc1-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:rep_nop 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:340 [inline]
RIP: 0010:smp_call_function_many_cond+0x1baa/0x2d40 kernel/smp.c:885
Code: b6 04 03 84 c0 75 7e 45 8b 65 00 44 89 e6 83 e6 01 31 ff e8 c8 e2 0b 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 78 de 0b 00 eb 41 90 48 b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 75 11 41 f7
RSP: 0018:ffffc90001557640 EFLAGS: 00000293
RAX: ffffffff81b776cd RBX: 1ffff110170e7e91 RCX: ffff88801cf4bc00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90001557840 R08: ffffffff81b77698 R09: 1ffffffff20bfbee
R10: dffffc0000000000 R11: fffffbfff20bfbef R12: ffff8880b863ad08
R13: ffff8880b873f488 R14: ffff8880b863ad00 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888124f96000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007febf1d78ab8 CR3: 000000000eb38000 CR4: 0000000000350ef0
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
on_each_cpu include/linux/smp.h:71 [inline]
text_poke_sync arch/x86/kernel/alternative.c:2455 [inline]
text_poke_bp_batch+0x354/0xb30 arch/x86/kernel/alternative.c:2665
text_poke_flush arch/x86/kernel/alternative.c:2856 [inline]
text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2863
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:210
static_key_enable+0x1a/0x20 kernel/jump_label.c:223
toggle_allocation_gate+0xc0/0x250 mm/kfence/core.c:850
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xac5/0x18e0 kernel/workqueue.c:3319
worker_thread+0x870/0xd50 kernel/workqueue.c:3400
kthread+0x7b9/0x940 kernel/kthread.c:464
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245