rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P27201/1:b..l P27215/1:b..l P5486/1:b..l P19489/1:b..l P27177/2:b..l
rcu: (detected by 0, t=10502 jiffies, g=113097, q=142 ncpus=2)
task:syz.8.6057 state:R running task stack:24160 pid:27177 tgid:27176 ppid:19454 task_flags:0x40054c flags:0x00080001
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:debug_lockdep_rcu_enabled+0x0/0x40 kernel/rcu/update.c:319
Code: 36 68 37 f6 90 0f 0b 90 90 90 eb c4 cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 31 c0 83 3d 77 c7 52 04 00 74 1e 83 3d 7a f6 52 04 00
RSP: 0018:ffffc9000b2a7128 EFLAGS: 00000293
RAX: ffffffff81f7b604 RBX: ffffffff81f7b4dc RCX: ffff88802e5c3c80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 0000000000000001 R08: ffffea0001b28d77 R09: 1ffffd40003651ae
R10: dffffc0000000000 R11: fffff940003651af R12: dffffc0000000000
R13: fffffffffffffffe R14: ffffea0001b28d74 R15: 0000000000000001
rcu_read_unlock include/linux/rcupdate.h:895 [inline]
page_ref_add_unless include/linux/page_ref.h:239 [inline]
folio_ref_add_unless include/linux/page_ref.h:248 [inline]
folio_try_get+0x149/0x340 include/linux/page_ref.h:264
find_get_entry mm/filemap.c:2082 [inline]
find_lock_entries+0x24f/0xa60 mm/filemap.c:2172
shmem_undo_range+0x254/0x14b0 mm/shmem.c:1102
shmem_truncate_range mm/shmem.c:1232 [inline]
shmem_evict_inode+0x272/0xa70 mm/shmem.c:1360
evict+0x504/0x9c0 fs/inode.c:810
__dentry_kill+0x209/0x660 fs/dcache.c:669
dput+0x19f/0x2b0 fs/dcache.c:911
__fput+0x68e/0xa70 fs/file_table.c:476
task_work_run+0x1d4/0x260 kernel/task_work.c:227
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x6b5/0x2300 kernel/exit.c:966
do_group_exit+0x21c/0x2d0 kernel/exit.c:1107
get_signal+0x1285/0x1340 kernel/signal.c:3034
arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x72/0x130 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+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd597d8eec9
RSP: 002b:00007fd598c9b038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: 0000000000010106 RBX: 00007fd597fe5fa0 RCX: 00007fd597d8eec9
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000007
RBP: 00007fd597e11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd597fe6038 R14: 00007fd597fe5fa0 R15: 00007ffeee274f28
task:kworker/u8:1 state:R running task stack:21128 pid:19489 tgid:19489 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: bat_events batadv_mcast_mla_update
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7113
preempt_schedule+0xae/0xc0 kernel/sched/core.c:7137
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
irq_work_queue+0xe0/0x140 kernel/irq_work.c:125
__kfence_alloc+0x27b/0x3b0 mm/kfence/core.c:1116
kfence_alloc include/linux/kfence.h:129 [inline]
slab_alloc_node mm/slub.c:5226 [inline]
__kmalloc_cache_noprof+0x5ea/0x6f0 mm/slub.c:5720
kmalloc_noprof include/linux/slab.h:957 [inline]
batadv_mcast_mla_meshif_get_ipv4 net/batman-adv/multicast.c:402 [inline]
batadv_mcast_mla_meshif_get net/batman-adv/multicast.c:529 [inline]
__batadv_mcast_mla_update net/batman-adv/multicast.c:909 [inline]
batadv_mcast_mla_update+0xf92/0x3640 net/batman-adv/multicast.c:946
process_one_work kernel/workqueue.c:3263 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
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
task:dhcpcd state:R running task stack:21288 pid:5486 tgid:5486 ppid:5485 task_flags:0x400140 flags:0x00080001
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_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__rcu_read_unlock+0x0/0xe0 kernel/rcu/tree_plugin.h:431
Code: 89 d9 80 e1 07 80 c1 03 38 c1 7c dc 48 89 df e8 36 9a 7e 00 eb d2 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 41 57 41 56 41 55 41 54 53 49 bf 00 00 00 00 00 fc ff
RSP: 0018:ffffc90003d4f2f0 EFLAGS: 00000286
RAX: 2011df59b97c6900 RBX: ffffffff90d29d01 RCX: 2011df59b97c6900
RDX: 0000000000000003 RSI: ffffffff8d9d15ab RDI: ffffffff8bc074e0
RBP: dffffc0000000000 R08: ffffc90003d4ff38 R09: ffffc90003d4f418
R10: dffffc0000000000 R11: fffff520007a9e85 R12: ffffc90003d4ff48
R13: ffffc90003d48000 R14: ffffc90003d4f3c8 R15: ffffffff81731d25
rcu_read_unlock include/linux/rcupdate.h:899 [inline]
class_rcu_destructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0x19ae/0x2390 arch/x86/kernel/unwind_orc.c:680
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:56 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
unpoison_slab_object mm/kasan/common.c:342 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:368
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4947 [inline]
slab_alloc_node mm/slub.c:5246 [inline]
kmem_cache_alloc_noprof+0x367/0x6e0 mm/slub.c:5253
vm_area_dup+0x2b/0x680 mm/vma_init.c:123
dup_mmap+0x903/0x1b10 mm/mmap.c:1780
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: 0033:0x7f47cbb98636
RSP: 002b:00007fffa58c7030 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fffa58c7038 RCX: 00007f47cbb98636
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fffa58e7580 R08: 0000000000000000 R09: 0000000000000001
R10: 00007f47cbac4a10 R11: 0000000000000246 R12: 00007fffa58c7170
R13: 0000000000000000 R14: 0000000000000000 R15: 0000558fbea95ac0
task:syz-executor state:R running task stack:26920 pid:27215 tgid:27215 ppid:19546 task_flags:0x400040 flags:0x00080001
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_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:debug_lockdep_rcu_enabled+0x21/0x40 kernel/rcu/update.c:321
Code: 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 31 c0 83 3d 77 c7 52 04 00 74 1e 83 3d 7a f6 52 04 00 74 15 65 48 8b 0c 25 08 10 91 92 <31> c0 83 b9 2c 0b 00 00 00 0f 94 c0 e9 d9 f7 c4 f5 cc cc cc cc cc
RSP: 0018:ffffc900040ef5f0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffffff823a0987 RCX: ffff888033688000
RDX: 0000000000000000 RSI: ffffffff8d9d15ab RDI: ffffffff8bc074e0
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffffff81731d25
R10: dffffc0000000000 R11: ffffffff81abbce0 R12: 1ffff9200081ded9
R13: ffffc900040ef700 R14: ffffc900040ef6c8 R15: ffffffff81731d25
rcu_read_lock include/linux/rcupdate.h:868 [inline]
class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0xcb/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
kasan_save_stack mm/kasan/common.c:56 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
__kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587
kasan_save_free_info mm/kasan/kasan.h:406 [inline]
poison_slab_object mm/kasan/common.c:252 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:234 [inline]
slab_free_hook mm/slub.c:2515 [inline]
slab_free mm/slub.c:6574 [inline]
kfree+0x19a/0x6d0 mm/slub.c:6781
tomoyo_path_perm+0x36f/0x4b0 security/tomoyo/file.c:840
tomoyo_path_symlink+0xa3/0xe0 security/tomoyo/tomoyo.c:212
security_path_symlink+0x177/0x380 security/security.c:2023
do_symlinkat+0x107/0x3f0 fs/namei.c:4841
__do_sys_symlinkat fs/namei.c:4859 [inline]
__se_sys_symlinkat fs/namei.c:4856 [inline]
__x64_sys_symlinkat+0x95/0xb0 fs/namei.c:4856
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: 0033:0x7fe66338e447
RSP: 002b:00007ffe3c88b878 EFLAGS: 00000206 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe66338e447
RDX: 00007fe663413852 RSI: 00000000ffffff9c RDI: 00007ffe3c88b910
RBP: 00007ffe3c88b8bc R08: 0000000000000013 R09: 00007ffe3c88b5c7
R10: 0000000000000000 R11: 0000000000000206 R12: 000000000000014e
R13: 00000000000927c0 R14: 0000000000128a40 R15: 00007ffe3c88b910
task:syz.7.6065 state:R running task stack:25608 pid:27201 tgid:27198 ppid:20768 task_flags:0x400040 flags:0x00080001
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_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_release+0x2b5/0x3e0 kernel/locking/lockdep.c:5893
Code: 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 56 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 7b 1a f4 10 <48> 3b 44 24 28 0f 85 8b 00 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000415f0f0 EFLAGS: 00000206
RAX: d33a5d5649a16e00 RBX: 0000000000000206 RCX: d33a5d5649a16e00
RDX: 0000000000000000 RSI: ffffffff8d9d15ab RDI: ffffffff8bc074e0
RBP: ffff888029820b30 R08: ffffc9000415f350 R09: ffffc9000415f278
R10: dffffc0000000000 R11: fffff5200082be51 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8e13d320 R15: ffff888029820000
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:897 [inline]
class_rcu_destructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0x19a9/0x2390 arch/x86/kernel/unwind_orc.c:680
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
__reset_page_owner+0x71/0x1f0 mm/page_owner.c:308
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
free_unref_folios+0xdb3/0x14f0 mm/page_alloc.c:2963
folios_put_refs+0x584/0x670 mm/swap.c:1002
folio_batch_release include/linux/pagevec.h:101 [inline]
shmem_undo_range+0x49e/0x14b0 mm/shmem.c:1120
shmem_truncate_range mm/shmem.c:1232 [inline]
shmem_evict_inode+0x272/0xa70 mm/shmem.c:1360
evict+0x504/0x9c0 fs/inode.c:810
__dentry_kill+0x209/0x660 fs/dcache.c:669
dput+0x19f/0x2b0 fs/dcache.c:911
__fput+0x68e/0xa70 fs/file_table.c:476
fput_close_sync+0x119/0x200 fs/file_table.c:573
__do_sys_close fs/open.c:1589 [inline]
__se_sys_close fs/open.c:1574 [inline]
__x64_sys_close+0x7f/0x110 fs/open.c:1574
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: 0033:0x7f053838db2a
RSP: 002b:00007f0539169e00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007f053838db2a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000005e14
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000004
R13: 00007f0539169ef0 R14: 00007f0539169eb0 R15: 00007f052e000000
rcu: rcu_preempt kthread starved for 10573 jiffies! g113097 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:25960 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: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: 2e 03 c5 f5 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d e3 f0 1c 00 f3 0f 1e fa fb f4 03 03 c5 f5 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff8de07d80 EFLAGS: 000002c6
RAX: f5411d1f1e171600 RBX: ffffffff81960c17 RCX: f5411d1f1e171600
RDX: 0000000000000001 RSI: ffffffff8d7e8769 RDI: ffffffff8bc074e0
RBP: ffffffff8de07ea8 R08: ffff8880b8632fdb R09: 1ffff110170c65fb
R10: dffffc0000000000 R11: ffffed10170c65fc R12: ffffffff8f9e0f70
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1bd2a40
FS: 0000000000000000(0000) GS:ffff888125d0f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdebd225927 CR3: 00000000632d8000 CR4: 0000000000350ef0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x73/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:190 [inline]
do_idle+0x1e7/0x510 kernel/sched/idle.c:330
cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:428
rest_init+0x2de/0x300 init/main.c:757
start_kernel+0x3ae/0x410 init/main.c:1111
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x147