rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P7242 P7213/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=14305, q=358 ncpus=2)
task:syz.1.310 state:R running task stack:25528 pid:7213 tgid:7210 ppid:5818 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5248 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6855
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7182
irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x62/0x330 kernel/locking/lockdep.c:5872
Code: f8 0e 12 83 f8 07 0f 87 a2 02 00 00 89 c0 48 0f a3 05 92 7b ec 0e 0f 82 74 02 00 00 8b 35 0a ac ec 0e 85 f6 0f 85 8d 00 00 00 <48> 8b 44 24 30 65 48 2b 05 a9 f7 0e 12 0f 85 ad 02 00 00 48 83 c4
RSP: 0018:ffffc9000bef71d0 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff8e3c95a0 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8da7ce60 RDI: ffffffff8bf1cd00
RBP: 0000000000000002 R08: 000000009a88c1b9 R09: 0000000055087b41
R10: ffff8880342f0b30 R11: 00000000155087b4 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:867 [inline]
class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0xd1/0x20a0 arch/x86/kernel/unwind_orc.c:479
arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
unpoison_slab_object mm/kasan/common.c:342 [inline]
__kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:368
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4978 [inline]
slab_alloc_node mm/slub.c:5288 [inline]
kmem_cache_alloc_noprof+0x250/0x720 mm/slub.c:5295
__kernfs_new_node+0xd2/0x8d0 fs/kernfs/dir.c:637
kernfs_new_node+0x13c/0x1e0 fs/kernfs/dir.c:713
__kernfs_create_file+0x53/0x350 fs/kernfs/file.c:1057
sysfs_add_file_mode_ns+0x207/0x3c0 fs/sysfs/file.c:313
create_files fs/sysfs/group.c:76 [inline]
internal_create_group+0x578/0xf20 fs/sysfs/group.c:183
internal_create_groups+0x9d/0x150 fs/sysfs/group.c:223
setup_gid_attrs drivers/infiniband/core/sysfs.c:1162 [inline]
ib_setup_port_attrs+0x41f/0x600 drivers/infiniband/core/sysfs.c:1439
add_one_compat_dev+0x558/0x7d0 drivers/infiniband/core/device.c:1005
rdma_dev_init_net+0x2b1/0x530 drivers/infiniband/core/device.c:1221
ops_init+0x1e2/0x5f0 net/core/net_namespace.c:137
setup_net+0x11d/0x3a0 net/core/net_namespace.c:445
copy_net_ns+0x351/0x5d0 net/core/net_namespace.c:580
create_new_namespaces+0x3ea/0xab0 kernel/nsproxy.c:130
unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:226
ksys_unshare+0x45b/0xa40 kernel/fork.c:3129
__do_sys_unshare kernel/fork.c:3200 [inline]
__se_sys_unshare kernel/fork.c:3198 [inline]
__x64_sys_unshare+0x31/0x40 kernel/fork.c:3198
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f32f518f749
RSP: 002b:00007f32f5fef038 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f32f53e6180 RCX: 00007f32f518f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000066000080
RBP: 00007f32f5213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f32f53e6218 R14: 00007f32f53e6180 R15: 00007fff08814ff8
task:syz.3.317 state:R running task stack:27016 pid:7242 tgid:7241 ppid:5826 task_flags:0x400140 flags:0x00080000
Call Trace:
sched_show_task kernel/sched/core.c:7814 [inline]
sched_show_task+0x423/0x630 kernel/sched/core.c:7789
rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:292 [inline]
print_other_cpu_stall kernel/rcu/tree_stall.h:681 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:856 [inline]
rcu_pending kernel/rcu/tree.c:3667 [inline]
rcu_sched_clock_irq+0x2435/0x2f60 kernel/rcu/tree.c:2704
update_process_times+0x178/0x2d0 kernel/time/timer.c:2474
tick_sched_handle kernel/time/tick-sched.c:298 [inline]
tick_nohz_handler+0x506/0x720 kernel/time/tick-sched.c:319
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x64e/0xc40 kernel/time/hrtimer.c:1841
hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1903
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x3c0 arch/x86/kernel/apic/apic.c:1062
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x20 kernel/kcov.c:313
Code: 0c 24 0f b7 d6 0f b7 f7 bf 03 00 00 00 e9 58 fe ff ff 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 0c 24 89 f2 89 fe bf 05 00 00 00 e9 2a fe ff ff
RSP: 0018:ffffc9000c17f7d8 EFLAGS: 00000246
RAX: 0000000000080000 RBX: 0000000000000008 RCX: ffffc9000d3a9000
RDX: 0000000000080000 RSI: 0000000000000008 RDI: 0000000000000060
RBP: 1ffff9200182fefe R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 00000000ffffffff R12: ffffc9000c17f8b0
R13: 0000000000000000 R14: ffff88805887e200 R15: 0000000000000000
____bpf_snprintf kernel/bpf/helpers.c:1057 [inline]
bpf_snprintf+0xce/0x1e0 kernel/bpf/helpers.c:1049
bpf_prog_648d81472c51bdce+0x66/0x6e
bpf_dispatcher_nop_func include/linux/bpf.h:1350 [inline]
__bpf_prog_run include/linux/filter.h:721 [inline]
bpf_prog_run include/linux/filter.h:728 [inline]
bpf_test_run+0x3d3/0xa60 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0xbae/0x2290 net/bpf/test_run.c:1091
bpf_prog_test_run kernel/bpf/syscall.c:4688 [inline]
__sys_bpf+0x1035/0x4980 kernel/bpf/syscall.c:6167
__do_sys_bpf kernel/bpf/syscall.c:6259 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6257 [inline]
__x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:6257
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faf64d8f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007faf62ff6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007faf64fe5fa0 RCX: 00007faf64d8f749
RDX: 0000000000000050 RSI: 0000200000000480 RDI: 000000000000000a
RBP: 00007faf64e13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faf64fe6038 R14: 00007faf64fe5fa0 R15: 00007ffe65d44338
rcu: rcu_preempt kthread starved for 10597 jiffies! g14305 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:28296 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5248 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6855
__schedule_loop kernel/sched/core.c:6937 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6952
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xaf0 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x26d/0x380 kernel/rcu/tree.c:2285
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 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 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: 66 76 02 e9 d3 2f 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 13 d3 2b 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:ffffffff8e007df8 EFLAGS: 000002c2
RAX: 0000000000912131 RBX: 0000000000000000 RCX: ffffffff8b5e86f9
RDX: 0000000000000000 RSI: ffffffff8daa2b8e RDI: ffffffff8bf1cd00
RBP: fffffbfff1c12f50 R08: 0000000000000001 R09: ffffed101708672d
R10: ffff8880b843396b R11: 00000000ffffffff R12: 0000000000000000
R13: ffffffff8e097a80 R14: ffffffff9085c3d0 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88812499c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30901ff8 CR3: 00000000294d3000 CR4: 00000000003526f0
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+0x6c/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x38d/0x510 kernel/sched/idle.c:332
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
rest_init+0x16b/0x2b0 init/main.c:757
start_kernel+0x3f6/0x4d0 init/main.c:1111
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x148