rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 ticks this GP) idle=6bec/1/0x4000000000000000 softirq=47597/47597 fqs=10
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11423/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=45629, q=1460 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11428 Comm: syz-executor 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:hlock_class kernel/locking/lockdep.c:234 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4855 [inline]
RIP: 0010:__lock_acquire+0x3c4/0x2cf0 kernel/locking/lockdep.c:5187
Code: ce 91 0e 48 c7 c6 58 f1 0b 8e 67 48 0f b9 3a 90 31 c0 0f b6 98 c4 00 00 00 41 8b 45 20 25 ff 1f 00 00 48 0f a3 05 2c 37 9e 12 <73> 17 48 69 c0 c8 00 00 00 48 8d 88 70 e3 e0 93 84 db 75 3f e9 10
RSP: 0018:ffffc90000a08be0 EFLAGS: 00000007
RAX: 0000000000000074 RBX: 0000000000000002 RCX: 0000000000000074
RDX: 0000000000080000 RSI: 0000000000004000 RDI: 0000000000000000
RBP: 0000000000000003 R08: ffffffff81b27ffa R09: ffff8880b8728298
R10: dffffc0000000000 R11: fffffbfff206039f R12: 0000000000000074
R13: ffff888027048c08 R14: ffff888027048000 R15: ffff888027048b90
FS: 00005555615ef500(0000) GS:ffff88812539f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6818badac0 CR3: 0000000077b10000 CR4: 0000000000350ef0
DR0: 0000000000000004 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:174
__run_hrtimer kernel/time/hrtimer.c:1934 [inline]
__hrtimer_run_queues+0x46a/0xa20 kernel/time/hrtimer.c:1994
hrtimer_interrupt+0x44b/0x950 kernel/time/hrtimer.c:2113
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
__sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:barn_replace_empty_sheaf+0xe/0x120 mm/slub.c:3167
Code: e8 f7 a4 c8 02 e9 23 ff ff ff 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 41 55 41 54 53 83 7f 60 00 <0f> 84 e7 00 00 00 49 89 f7 49 89 fe 84 d2 0f 84 8b 00 00 00 4c 89
RSP: 0018:ffffc90005c37a88 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88801bef0dc0 RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffff888020ea5e00 RDI: ffff88801aee9700
RBP: 0000000000000cc0 R08: ffffffff82256aac R09: ffff8880b8741c48
R10: dffffc0000000000 R11: ffffffff820ee480 R12: ffff8880b8741c48
R13: ffffffff933a2c48 R14: 0000000000000000 R15: ffff88801aee9700
__pcs_replace_empty_main+0xd7/0x720 mm/slub.c:4621
alloc_from_pcs mm/slub.c:4750 [inline]
slab_alloc_node mm/slub.c:4884 [inline]
kmem_cache_alloc_lru_noprof+0x37c/0x640 mm/slub.c:4918
shmem_alloc_inode+0x28/0x40 mm/shmem.c:5159
alloc_inode+0x6a/0x1b0 fs/inode.c:345
new_inode+0x22/0x170 fs/inode.c:1179
__shmem_get_inode mm/shmem.c:3076 [inline]
shmem_get_inode+0x3cd/0xfd0 mm/shmem.c:3150
shmem_symlink+0xa3/0x470 mm/shmem.c:4093
vfs_symlink+0x195/0x340 fs/namei.c:5643
filename_symlinkat+0x1cd/0x410 fs/namei.c:5668
__do_sys_symlinkat fs/namei.c:5688 [inline]
__se_sys_symlinkat+0x4e/0x2b0 fs/namei.c:5683
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6818b9bf17
Code: 44 00 00 48 89 f2 31 c9 48 89 fe bf 9c ff ff ff e9 8e f5 ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 b8 0a 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe34649be8 EFLAGS: 00000206 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6818b9bf17
RDX: 00007f6818c33d31 RSI: 00000000ffffff9c RDI: 00007ffe34649c80
RBP: 00007ffe34649c2c R08: 0000000000000001 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000206 R12: 000000000000015e
R13: 00000000000927c0 R14: 0000000000053c85 R15: 00007ffe34649c80
task:syz.3.1982 state:R running task stack:24696 pid:11423 tgid:11422 ppid:5633 task_flags:0x40054c flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1821/0x5740 kernel/sched/core.c:7189
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7370
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline]
_raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:190
spin_unlock include/linux/spinlock.h:390 [inline]
zap_pte_range mm/memory.c:1964 [inline]
zap_pmd_range mm/memory.c:2020 [inline]
zap_pud_range mm/memory.c:2048 [inline]
zap_p4d_range mm/memory.c:2069 [inline]
__zap_vma_range+0x3d36/0x4b70 mm/memory.c:2109
unmap_vmas+0x3ac/0x570 mm/memory.c:2178
exit_mmap+0x280/0x9e0 mm/mmap.c:1300
__mmput+0x118/0x430 kernel/fork.c:1178
exit_mm+0x1f6/0x2d0 kernel/exit.c:582
do_exit+0x6a2/0x22c0 kernel/exit.c:964
do_group_exit+0x21b/0x2d0 kernel/exit.c:1119
get_signal+0x1284/0x1330 kernel/signal.c:3037
arch_do_signal_or_restart+0xbc/0x840 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop+0xa9/0x680 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9caad9ce59
RSP: 002b:00007f9ca8ff60e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f9cab015fa8 RCX: 00007f9caad9ce59
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f9cab015fac
RBP: 00007f9cab015fa0 R08: 3fffffffffffffff R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9cab016038 R14: 00007fff3d00fbc0 R15: 00007fff3d00fca8
rcu: rcu_preempt kthread starved for 10482 jiffies! g45629 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:27544 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1821/0x5740 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7283
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x389/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 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: 11429 Comm: syz.5.1984 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: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+0xfcd/0x13d0 kernel/smp.c:892
Code: c0 75 79 45 8b 2e 44 89 ee 83 e6 01 31 ff e8 9a 07 0c 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 45 03 0c 00 eb 37 90 43 0f b6 04 2c 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 2a
RSP: 0018:ffffc9000e10f200 EFLAGS: 00000246
RAX: ffffffff81b9b4a6 RBX: ffff8880b863c188 RCX: 0000000000080000
RDX: ffffc9000685c000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000e10f340 R08: ffffffff90301cf7 R09: 1ffffffff206039e
R10: dffffc0000000000 R11: fffffbfff206039f R12: 1ffff110170e8171
R13: dffffc0000000000 R14: ffff8880b8740b88 R15: 0000000000000001
FS: 00007f2a5669f6c0(0000) GS:ffff88812529f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3c0b8f CR3: 0000000036e7c000 CR4: 0000000000350ef0
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1057
on_each_cpu include/linux/smp.h:72 [inline]
smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2773 [inline]
smp_text_poke_batch_finish+0x5f5/0x1160 arch/x86/kernel/alternative.c:2983
__static_call_transform+0x4ff/0x790 arch/x86/kernel/static_call.c:119
arch_static_call_transform+0x98/0xc0 arch/x86/kernel/static_call.c:-1
__static_call_update+0xf2/0x620 kernel/static_call_inline.c:147
bpf_dispatcher_update kernel/bpf/dispatcher.c:126 [inline]
bpf_dispatcher_change_prog+0xbee/0xd70 kernel/bpf/dispatcher.c:168
dev_xdp_install+0x4fa/0x600 net/core/dev.c:10343
dev_xdp_attach+0xbdb/0x1050 net/core/dev.c:10491
dev_xdp_attach_link net/core/dev.c:10510 [inline]
bpf_xdp_link_attach+0x4cf/0x970 net/core/dev.c:10686
link_create+0x4d8/0x850 kernel/bpf/syscall.c:5794
__sys_bpf+0x468/0x950 kernel/bpf/syscall.c:6344
__do_sys_bpf kernel/bpf/syscall.c:6387 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6385 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6385
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2a5579ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2a5669f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f2a55a15fa0 RCX: 00007f2a5579ce59
RDX: 0000000000000014 RSI: 00002000000003c0 RDI: 000000000000001c
RBP: 00007f2a55832d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2a55a16038 R14: 00007f2a55a15fa0 R15: 00007ffdb8583ee8