rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=c84c/1/0x4000000000000000 softirq=25926/25927 fqs=1
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P7648/1:b..l P6751/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=19169, q=354 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6032 Comm: udevd Not tainted 6.15.0-rc2-syzkaller-00037-g834a4a689699 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:do_raw_spin_lock+0x45/0x370 kernel/locking/spinlock_debug.c:114
Code: 00 49 89 fc 48 c7 c0 20 d0 68 93 65 48 8b 00 48 89 84 24 80 00 00 00 48 ba 00 00 00 00 00 fc ff df 48 c7 44 24 40 b3 8a b5 41 <48> c7 44 24 48 9c 0c 4e 8e 48 c7 44 24 50 40 a2 9f 81 48 8d 74 24
RSP: 0018:ffffc90000a08aa0 EFLAGS: 00000086
RAX: 4dbb8f190796d700 RBX: 1ffff92000141170 RCX: 4dbb8f190796d700
RDX: dffffc0000000000 RSI: ffffffff8e4fde72 RDI: ffffffff9a956458
RBP: ffffc90000a08b70 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff9a956458
R13: 0000000000000046 R14: ffffffff9a956458 R15: ffffc90000a08ba0
FS: 00007f1eaf4b9c80(0000) GS:ffff888125093000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd72fe07c00 CR3: 00000000321ac000 CR4: 0000000000350ef0
Call Trace:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0xe4/0x130 kernel/locking/spinlock.c:162
debug_object_deactivate+0x164/0x390 lib/debugobjects.c:873
debug_hrtimer_deactivate kernel/time/hrtimer.c:450 [inline]
debug_deactivate+0x1b/0x220 kernel/time/hrtimer.c:490
__run_hrtimer kernel/time/hrtimer.c:1729 [inline]
__hrtimer_run_queues+0x310/0xd40 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:trace_lock_acquire include/trace/events/lock.h:24 [inline]
RIP: 0010:lock_acquire+0x60/0x2f0 kernel/locking/lockdep.c:5829
Code: 24 38 0f 1f 44 00 00 65 8b 05 80 e2 c9 11 83 f8 08 0f 83 b4 01 00 00 89 c0 48 0f a3 05 a9 f3 c0 0e 73 16 e8 82 c6 09 00 84 c0 <75> 0d f6 05 ca da aa 0e 01 0f 84 9b 01 00 00 83 3d 7a 22 c1 0e 00
RSP: 0018:ffffc9000473f468 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff8ed3dfa0 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff8ca1b740 RDI: ffffffff8ca1b700
RBP: ffffffff9368d020 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000003 R11: ffff88807f558000 R12: 0000000000000000
R13: 0000000000000002 R14: ffffffff81fdbbce R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
page_ref_add_unless include/linux/page_ref.h:235 [inline]
folio_ref_add_unless include/linux/page_ref.h:248 [inline]
folio_try_get+0x3b/0x350 include/linux/page_ref.h:264
find_get_entry mm/filemap.c:2039 [inline]
find_lock_entries+0x2c1/0xbc0 mm/filemap.c:2129
shmem_undo_range+0x2d6/0x1820 mm/shmem.c:1107
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: 0033:0x7f1eaf5900a8
Code: 48 8b 05 83 9d 0d 00 64 c7 00 16 00 00 00 83 c8 ff 48 83 c4 20 5b c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 5b 48 8b 15 51 9d 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffc5fc4d1e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007f1eaf4b9ae0 RCX: 00007f1eaf5900a8
RDX: 00005643e80b9d5f RSI: 00007ffc5fc4c9e8 RDI: 0000000000000008
RBP: 000056468c623ec0 R08: 0000000000000006 R09: b5010488125ef25f
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000002
R13: 000056468c622eb0 R14: 0000000000000008 R15: 000056468c60f910
task:syz-executor state:R running task stack:21240 pid:6751 tgid:6751 ppid:6703 task_flags:0x400140 flags:0x00000002
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:lock_acquire+0x167/0x2f0 arch/x86/include/asm/irqflags.h:-1
Code: c7 44 24 10 00 00 00 00 9c 8f 44 24 10 f7 44 24 10 00 02 00 00 0f 85 fd 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 65 48 8b 45 00 <48> 3b 44 24 38 0f 85 72 01 00 00 48 83 c4 40 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000ab973c8 EFLAGS: 00000206
RAX: 3412a581159c6f00 RBX: ffffffff8ed3dfa0 RCX: 3412a581159c6f00
RDX: 0000000000000000 RSI: ffffffff8e4fde72 RDI: ffffffff8ca1b760
RBP: ffffffff9368d020 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000002 R14: 0000000000000246 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0xd5/0x23b0 arch/x86/kernel/unwind_orc.c:479
__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
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0x9d/0xb0 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4331 [inline]
__kmalloc_noprof+0x28e/0x4d0 mm/slub.c:4343
kmalloc_noprof include/linux/slab.h:909 [inline]
tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x2be/0x640 security/tomoyo/file.c:822
tomoyo_path_unlink+0xd1/0x110 security/tomoyo/tomoyo.c:162
security_path_unlink+0x169/0x360 security/security.c:1965
do_unlinkat+0x397/0x7b0 fs/namei.c:4605
__do_sys_unlink fs/namei.c:4654 [inline]
__se_sys_unlink fs/namei.c:4652 [inline]
__x64_sys_unlink+0x47/0x50 fs/namei.c:4652
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: 0033:0x7f494458c717
RSP: 002b:00007ffdc2512688 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f494458c717
RDX: 00007ffdc25126b0 RSI: 00007ffdc2512740 RDI: 00007ffdc2512740
RBP: 00007ffdc2512740 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffdc25137d0
R13: 00007f494460e77c R14: 0000000000040764 R15: 00007ffdc2513810
task:dhcpcd-run-hook state:R running task stack:25896 pid:7648 tgid:7648 ppid:7611 task_flags:0x400040 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b88/0x5240 kernel/sched/core.c:6767
preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6947
preempt_schedule+0xe4/0xf0 kernel/sched/core.c:6971
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
zap_pte_range mm/memory.c:1761 [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+0x39c5/0x44d0 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
exec_mmap+0x7bd/0x8a0 fs/exec.c:1009
begin_new_exec+0x12f0/0x2150 fs/exec.c:1264
load_elf_binary+0x9a2/0x28a0 fs/binfmt_elf.c:1001
search_binary_handler fs/exec.c:1778 [inline]
exec_binprm fs/exec.c:1810 [inline]
bprm_execve+0x9ab/0x1430 fs/exec.c:1862
do_execveat_common+0x57c/0x710 fs/exec.c:1968
do_execve fs/exec.c:2042 [inline]
__do_sys_execve fs/exec.c:2118 [inline]
__se_sys_execve fs/exec.c:2113 [inline]
__x64_sys_execve+0x94/0xb0 fs/exec.c:2113
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: 0033:0x7faaf60edef7
RSP: 002b:00007ffd3c70dbd8 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 0000555e91034110 RCX: 00007faaf60edef7
RDX: 0000555e91034138 RSI: 0000555e91034110 RDI: 0000555e9102a388
RBP: 0000555e9102a388 R08: 0000555e9102a391 R09: 00007ffd3c712e07
R10: 000000000000002f R11: 0000000000000246 R12: 0000555e91034138
R13: 00007faaf629b904 R14: 0000555e91034138 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 10500 jiffies! g19169 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:26688 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: 5981 Comm: kworker/u8:10 Not tainted 6.15.0-rc2-syzkaller-00037-g834a4a689699 #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 18 e3 0b 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 c8 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:ffffc900045e7640 EFLAGS: 00000293
RAX: ffffffff81b7768d RBX: 1ffff110170e7e91 RCX: ffff88802b179e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900045e7840 R08: ffffffff81b77658 R09: 1ffffffff20bfc2e
R10: dffffc0000000000 R11: fffffbfff20bfc2f R12: ffff8880b863ad08
R13: ffff8880b873f488 R14: ffff8880b863ad00 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888124f93000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f39028d56c0 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