rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=2644/1/0x4000000000000000 softirq=142518/142522 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P19344/1:b..l P12/1:b..l P4968/1:b..l P48/1:b..l
rcu: (detected by 0, t=10505 jiffies, g=149473, q=355 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 36 Comm: kworker/u8:2 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:hrtimer_get_expires include/linux/hrtimer.h:111 [inline]
RIP: 0010:enqueue_hrtimer+0x1c3/0x2f0 kernel/time/hrtimer.c:1120
Code: f4 00 00 00 c6 45 38 01 48 8d 7b 58 48 89 ee e8 b3 ef 91 09 31 ff 41 89 c4 89 c6 e8 b7 41 14 00 45 84 e4 74 4b e8 5d 47 14 00 <48> 8d 7d 28 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80
RSP: 0018:ffffc90000a08e58 EFLAGS: 00000046
RAX: 0000000000010002 RBX: ffff8880b8528600 RCX: ffffffff81f45f79
RDX: ffff888020eda500 RSI: ffffffff81f45f83 RDI: ffff888020eda500
RBP: ffff88804b3c7300 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000010001
R13: 0000000000000002 R14: ffff8880b8528608 R15: ffff8880b8528650
FS: 0000000000000000(0000) GS:ffff888124472000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000002e000 CR3: 0000000023bc6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 00000000000001f8 DR2: 0000000000000002
DR3: ffffffffafffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
__run_hrtimer kernel/time/hrtimer.c:1946 [inline]
__hrtimer_run_queues+0x73d/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:lock_acquire+0x5e/0x370 kernel/locking/lockdep.c:5872
Code: 05 7b 5a 26 12 83 f8 07 0f 87 d9 02 00 00 48 0f a3 05 86 25 f3 0e 0f 82 a4 02 00 00 8b 35 0e 59 f3 0e 85 f6 0f 85 bf 00 00 00 <48> 8b 44 24 30 65 48 2b 05 1d 5a 26 12 0f 85 ed 02 00 00 48 83 c4
RSP: 0018:ffffc90000ac7600 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000004
RDX: 0000000000000000 RSI: ffffffff8defba01 RDI: ffffffff8c1c3780
RBP: ffffffff8e7e54e0 R08: 00000000748c6f0b R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
rcu_read_lock include/linux/rcupdate.h:838 [inline]
class_rcu_constructor include/linux/rcupdate.h:1181 [inline]
unwind_next_frame+0xd1/0x2090 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2689 [inline]
slab_free mm/slub.c:6250 [inline]
kfree+0x223/0x6c0 mm/slub.c:6565
skb_kfree_head net/core/skbuff.c:1075 [inline]
skb_free_head+0xb9/0x160 net/core/skbuff.c:1087
skb_release_data+0x6c5/0x8e0 net/core/skbuff.c:1114
skb_release_all net/core/skbuff.c:1189 [inline]
__kfree_skb net/core/skbuff.c:1203 [inline]
consume_skb net/core/skbuff.c:1436 [inline]
consume_skb+0xc4/0x110 net/core/skbuff.c:1430
nsim_dev_trap_report drivers/net/netdevsim/dev.c:892 [inline]
nsim_dev_trap_report_work+0x8de/0xd20 drivers/net/netdevsim/dev.c:922
process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302
process_scheduled_works kernel/workqueue.c:3385 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466
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
task:kworker/u8:3 state:R running task stack:21400 pid:48 tgid:48 ppid:2 task_flags:0x4208160 flags:0x00080000
Workqueue: events_unbound call_usermodehelper_exec_work
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1295/0x67a0 kernel/sched/core.c:7189
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7513
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:476 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
irqentry_exit+0x205/0x7e0 kernel/entry/common.c:164
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:unwind_next_frame+0x51d/0x2090 arch/x86/kernel/unwind_orc.c:527
Code: ff ff 3c 01 0f 84 7b fe ff ff 4c 8d 41 04 4c 89 fe 48 b8 00 00 00 00 00 fc ff df 4c 89 c2 48 c1 ee 03 48 c1 ea 03 0f b6 14 02 <0f> b6 04 06 4c 89 c6 83 e6 07 40 38 f2 40 0f 9e c6 84 d2 0f 95 c2
RSP: 0018:ffffc90000b96bd0 EFLAGS: 00000a03
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff918404a0
RDX: 0000000000000000 RSI: 1ffffffff2308094 RDI: ffffffff90f8dae4
RBP: ffffc90000b96c88 R08: ffffffff918404a4 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000016450 R12: ffffc90000b96c90
R13: ffffc90000b96c40 R14: ffffc90000b96c75 R15: ffffffff918404a5
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
save_stack+0x162/0x1e0 mm/page_owner.c:165
__set_page_owner+0x8c/0x540 mm/page_owner.c:341
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x153/0x170 mm/page_alloc.c:1858
prep_new_page mm/page_alloc.c:1866 [inline]
get_page_from_freelist+0x11a6/0x33b0 mm/page_alloc.c:3946
__alloc_frozen_pages_noprof+0x27c/0x2bc0 mm/page_alloc.c:5226
alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490
alloc_pages_noprof+0x1a/0x160 mm/mempolicy.c:2581
get_free_pages_noprof+0x10/0xb0 mm/page_alloc.c:5285
__kasan_populate_vmalloc_do mm/kasan/shadow.c:364 [inline]
__kasan_populate_vmalloc+0xa0/0x210 mm/kasan/shadow.c:424
kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
alloc_vmap_area+0x95d/0x2b70 mm/vmalloc.c:2123
__get_vm_area_node+0x1ca/0x330 mm/vmalloc.c:3226
__vmalloc_node_range_noprof+0x228/0x1630 mm/vmalloc.c:4024
__vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:4124
alloc_thread_stack_node kernel/fork.c:357 [inline]
dup_task_struct kernel/fork.c:926 [inline]
copy_process+0x7fb/0x7ed0 kernel/fork.c:2090
kernel_clone+0x12e/0x9c0 kernel/fork.c:2721
user_mode_thread+0xcc/0x110 kernel/fork.c:2797
call_usermodehelper_exec_sync kernel/umh.c:132 [inline]
call_usermodehelper_exec_work+0x6b/0x180 kernel/umh.c:163
process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302
process_scheduled_works kernel/workqueue.c:3385 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466
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
task:klogd state:R running task stack:24600 pid:4968 tgid:4968 ppid:1 task_flags:0x400100 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1295/0x67a0 kernel/sched/core.c:7189
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7513
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:476 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
irqentry_exit+0x205/0x7e0 kernel/entry/common.c:164
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:avc_lookup+0x0/0x240 security/selinux/avc.c:554
Code: 8b bd 10 ff ff ff e8 2f 8c c8 fd e9 2a fd ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <41> 57 41 89 f7 41 56 41 89 d6 41 55 41 89 fd 41 54 55 53 89 d3 e8
RSP: 0018:ffffc9000342fc28 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000004 RCX: ffffffff84ae17a1
RDX: 0000000000000035 RSI: 000000000000004e RDI: 000000000000004e
RBP: 0000000000000035 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: 000000000000004e R14: 000000000000004e R15: ffffc9000342fca0
avc_has_perm_noaudit+0x97/0x3b0 security/selinux/avc.c:1157
cred_has_capability.isra.0+0x171/0x300 security/selinux/hooks.c:1666
security_capable+0x10d/0x260 security/security.c:660
ns_capable_common kernel/capability.c:342 [inline]
ns_capable kernel/capability.c:363 [inline]
capable+0x72/0xf0 kernel/capability.c:416
check_syslog_permissions kernel/printk/printk.c:627 [inline]
do_syslog+0x10e/0x6d0 kernel/printk/printk.c:1747
__do_sys_syslog kernel/printk/printk.c:1855 [inline]
__se_sys_syslog kernel/printk/printk.c:1853 [inline]
__x64_sys_syslog+0x74/0xb0 kernel/printk/printk.c:1853
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: 0033:0x7faa33120a37
RSP: 002b:00007ffcec2fc188 EFLAGS: 00000206 ORIG_RAX: 0000000000000067
RAX: ffffffffffffffda RBX: 00007faa332c0490 RCX: 00007faa33120a37
RDX: 00000000000003ff RSI: 00007faa332c0490 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000004000 R11: 0000000000000206 R12: 00007faa332c0490
R13: 00007faa3329ddfe R14: 00007faa332c04d5 R15: 00007faa332c04d5
task:kworker/u8:0 state:R running task stack:23736 pid:12 tgid:12 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1295/0x67a0 kernel/sched/core.c:7189
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7513
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:476 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
irqentry_exit+0x205/0x7e0 kernel/entry/common.c:164
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:rcu_preempt_read_exit kernel/rcu/tree_plugin.h:396 [inline]
RIP: 0010:__rcu_read_unlock+0x3f/0x5e0 kernel/rcu/tree_plugin.h:435
Code: 12 48 8d bb c4 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 <84> d2 0f 85 0a 02 00 00 83 ab c4 04 00 00 01 75 3b 48 8d bb c8 04
RSP: 0018:ffffc90000117a68 EFLAGS: 00000202
RAX: 0000000000000007 RBX: ffff88801deeca00 RCX: ffffc90000117a64
RDX: 0000000000000000 RSI: ffffffff8defba01 RDI: ffff88801deecec4
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888038920e40 R14: 0000000000000137 R15: ffff888026629080
rcu_read_unlock include/linux/rcupdate.h:871 [inline]
batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:781 [inline]
batadv_iv_ogm_schedule_buff+0x790/0x1520 net/batman-adv/bat_iv_ogm.c:836
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:876 [inline]
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:869 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x6e0/0x860 net/batman-adv/bat_iv_ogm.c:1712
process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302
process_scheduled_works kernel/workqueue.c:3385 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466
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
task:syz.8.3146 state:R running task stack:28952 pid:19344 tgid:19343 ppid:17799 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1295/0x67a0 kernel/sched/core.c:7189
preempt_schedule_notrace+0x5f/0xd0 kernel/sched/core.c:7463
preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13
rcu_is_watching+0x8e/0xc0 kernel/rcu/tree.c:753
rcu_read_lock include/linux/rcupdate.h:839 [inline]
audit_filter+0x979/0xcf0 kernel/auditfilter.c:1341
audit_log_start+0xb3/0x930 kernel/audit.c:1916
common_lsm_audit+0xb2/0x2b0 security/lsm_audit.c:442
slow_avc_audit+0x186/0x210 security/selinux/avc.c:779
avc_audit security/selinux/include/avc.h:131 [inline]
avc_has_perm+0x1a6/0x1e0 security/selinux/avc.c:1198
superblock_has_perm security/selinux/hooks.c:1998 [inline]
selinux_sb_kern_mount+0x1b8/0x260 security/selinux/hooks.c:2792
security_sb_kern_mount+0x87/0x1e0 security/security.c:1037
vfs_cmd_create fs/fsopen.c:238 [inline]
vfs_cmd_create+0x18d/0x2a0 fs/fsopen.c:217
vfs_fsconfig_locked fs/fsopen.c:295 [inline]
__do_sys_fsconfig+0x55a/0xcb0 fs/fsopen.c:463
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: 0033:0x7f8fdf79cdd9
RSP: 002b:00007f8fe06b5028 EFLAGS: 00000246 ORIG_RAX: 00000000000001af
RAX: ffffffffffffffda RBX: 00007f8fdfa15fa0 RCX: 00007f8fdf79cdd9
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003
RBP: 00007f8fdf832d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8fdfa16038 R14: 00007f8fdfa15fa0 R15: 00007fff502e0208
rcu: rcu_preempt kthread starved for 10505 jiffies! g149473 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:28216 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:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 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:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: e6 92 02 e9 c3 42 03 00 0f 1f 00 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 10 21 00 fb f4 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffffff8e407e00 EFLAGS: 00000246
RAX: 000000000494d469 RBX: ffffffff8e4955c0 RCX: ffffffff8b8a8095
RDX: 0000000000000000 RSI: ffffffff8df20f0f RDI: ffffffff8c1c3780
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed10170867b5
R10: ffff8880b8433dab R11: 0000000000000000 R12: 0000000000000000
R13: fffffbfff1c92ab8 R14: 0000000000000000 R15: ffffffff90d7ab50
FS: 0000000000000000(0000) GS:ffff888124372000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3919df CR3: 0000000023bc6000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline]
default_idle+0x9/0x10 arch/x86/kernel/process.c:767
default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:199 [inline]
do_idle+0x464/0x590 kernel/sched/idle.c:352
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:451
rest_init+0x251/0x260 init/main.c:762
start_kernel+0x484/0x490 init/main.c:1220
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x148