rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11074/1:b..l P9198/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=51549, q=261 ncpus=2)
task:syz-executor state:R running task stack:21072 pid:9198 tgid:9198 ppid:9189 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x14bc/0x5000 kernel/sched/core.c:6863
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190
irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:bpf_tree_comp kernel/bpf/core.c:614 [inline]
RIP: 0010:__lt_find include/linux/rbtree_latch.h:115 [inline]
RIP: 0010:latch_tree_find include/linux/rbtree_latch.h:210 [inline]
RIP: 0010:bpf_ksym_find kernel/bpf/core.c:712 [inline]
RIP: 0010:is_bpf_text_address+0x152/0x2b0 kernel/bpf/core.c:745
Code: 28 00 74 08 4c 89 e7 e8 ec 13 57 00 4d 8b 24 24 4c 89 e7 4c 89 f6 e8 7d c4 f0 ff 4d 39 f4 76 0c e8 13 c2 f0 ff b8 10 00 00 00 3f 49 8d 1c 2f 4c 8d a3 e8 fd ff ff 4c 89 e0 48 c1 e8 03 42 80
RSP: 0018:ffffc9000473f470 EFLAGS: 00000293
RAX: 0000000000000010 RBX: 0000000000000000 RCX: ffff888025130000
RDX: 0000000000000000 RSI: 00007f3c31d8de3a RDI: ffffffffa00044c0
RBP: 0000000000000000 R08: ffffffff81d0edb6 R09: ffffffff8df419e0
R10: dffffc0000000000 R11: ffffffff81ad9fb0 R12: ffffffffa00044c0
R13: dffffc0000000000 R14: 00007f3c31d8de3a R15: ffffffff8f309c18
kernel_text_address+0xa5/0xe0 kernel/extable.c:125
__kernel_text_address+0xd/0x40 kernel/extable.c:79
unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:369
arch_stack_walk+0xfc/0x150 arch/x86/kernel/stacktrace.c:26
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
poison_kmalloc_redzone mm/kasan/common.c:397 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414
kasan_kmalloc include/linux/kasan.h:262 [inline]
__do_kmalloc_node mm/slub.c:5652 [inline]
__kmalloc_noprof+0x41d/0x800 mm/slub.c:5664
kmalloc_noprof include/linux/slab.h:961 [inline]
tomoyo_realpath_from_path+0xe3/0x5d0 security/tomoyo/realpath.c:251
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x213/0x4b0 security/tomoyo/file.c:822
security_inode_getattr+0x12f/0x330 security/security.c:1869
vfs_getattr fs/stat.c:259 [inline]
vfs_statx_path fs/stat.c:299 [inline]
vfs_statx+0x18e/0x550 fs/stat.c:356
vfs_fstatat+0x118/0x170 fs/stat.c:375
__do_sys_newfstatat fs/stat.c:542 [inline]
__se_sys_newfstatat fs/stat.c:536 [inline]
__x64_sys_newfstatat+0x116/0x190 fs/stat.c:536
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3c31d8de3a
RSP: 002b:00007ffef5cd1518 EFLAGS: 00000286 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00007f3c31e13d7d RCX: 00007f3c31d8de3a
RDX: 00007ffef5cd1540 RSI: 00007ffef5cd15d0 RDI: 00000000ffffff9c
RBP: 00007ffef5cd15d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000286 R12: 00007ffef5cd2660
R13: 00007f3c31e13d7d R14: 0000000000098e06 R15: 00007ffef5cd26a0
task:syz-executor state:R running task stack:21680 pid:11074 tgid:11074 ppid:11064 task_flags:0x480140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x14bc/0x5000 kernel/sched/core.c:6863
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7047
preempt_schedule+0xae/0xc0 kernel/sched/core.c:7071
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0xfd/0x110 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
__wake_up_common_lock+0x190/0x1f0 kernel/sched/wait.c:127
sock_def_readable+0x1eb/0x530 net/core/sock.c:3611
__netlink_sendskb net/netlink/af_netlink.c:1263 [inline]
netlink_broadcast_deliver net/netlink/af_netlink.c:1399 [inline]
do_one_broadcast net/netlink/af_netlink.c:1488 [inline]
netlink_broadcast_filtered+0xc2e/0x1000 net/netlink/af_netlink.c:1533
netlink_broadcast+0x37/0x50 net/netlink/af_netlink.c:1557
uevent_net_broadcast_tagged lib/kobject_uevent.c:373 [inline]
kobject_uevent_net_broadcast+0x4bc/0x560 lib/kobject_uevent.c:413
kobject_uevent_env+0x55c/0x9f0 lib/kobject_uevent.c:608
__kobject_del+0xd2/0x330 lib/kobject.c:601
kobject_cleanup lib/kobject.c:680 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x240/0x570 lib/kobject.c:737
netdev_queue_update_kobjects+0x5db/0x6c0 net/core/net-sysfs.c:2073
remove_queue_kobjects net/core/net-sysfs.c:2170 [inline]
netdev_unregister_kobject+0x11f/0x450 net/core/net-sysfs.c:2325
unregister_netdevice_many_notify+0x1ddd/0x2340 net/core/dev.c:12416
unregister_netdevice_many net/core/dev.c:12444 [inline]
unregister_netdevice_queue+0x317/0x350 net/core/dev.c:12258
unregister_netdevice include/linux/netdevice.h:3405 [inline]
nsim_destroy+0x1e5/0x680 drivers/net/netdevsim/netdev.c:1180
__nsim_dev_port_del+0x14d/0x1b0 drivers/net/netdevsim/dev.c:1528
nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1540 [inline]
nsim_dev_reload_destroy+0x288/0x490 drivers/net/netdevsim/dev.c:1763
nsim_drv_remove+0x58/0x160 drivers/net/netdevsim/dev.c:1778
device_remove drivers/base/dd.c:569 [inline]
__device_release_driver drivers/base/dd.c:1282 [inline]
device_release_driver_internal+0x46f/0x800 drivers/base/dd.c:1305
bus_remove_device+0x34d/0x440 drivers/base/bus.c:616
device_del+0x511/0x8e0 drivers/base/core.c:3878
device_unregister+0x21/0x100 drivers/base/core.c:3919
nsim_bus_dev_del drivers/net/netdevsim/bus.c:483 [inline]
del_device_store+0x2aa/0x360 drivers/net/netdevsim/bus.c:244
kernfs_fop_write_iter+0x3af/0x540 fs/kernfs/file.c:352
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x5c9/0xb30 fs/read_write.c:686
ksys_write+0x145/0x250 fs/read_write.c:738
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f554eb8e1ff
RSP: 002b:00007ffed5fc5050 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f554eb8e1ff
RDX: 0000000000000001 RSI: 00007ffed5fc50a0 RDI: 0000000000000005
RBP: 00007f554ec152cb R08: 0000000000000000 R09: 00007ffed5fc4ea7
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 00007ffed5fc50a0 R14: 00007f554f914620 R15: 0000000000000003
rcu: rcu_preempt kthread starved for 10592 jiffies! g51549 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:27296 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x14bc/0x5000 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6960
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+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
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 10/25/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: be f3 b5 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 f3 00 0e 00 f3 0f 1e fa fb f4 93 f3 b5 f5 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff8dc07d80 EFLAGS: 000002c6
RAX: 90e6436b8bfc4800 RBX: ffffffff81978eba RCX: 90e6436b8bfc4800
RDX: 0000000000000001 RSI: ffffffff8d7849cd RDI: ffffffff8bc01ce0
RBP: ffffffff8dc07ea8 R08: ffff8880b88336db R09: 1ffff110171066db
R10: dffffc0000000000 R11: ffffed10171066dc R12: ffffffff8f816570
R13: 1ffffffff1b92a68 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88812604a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffef5cd0d68 CR3: 0000000066712000 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:191 [inline]
do_idle+0x1ea/0x520 kernel/sched/idle.c:332
cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:430
rest_init+0x2de/0x300 init/main.c:757
start_kernel+0x3a7/0x400 init/main.c:1206
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