GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P8856/1:b..l..
rcu: (detected by 0, t=10503 jiffies, g=240657, q=375990 ncpus=2)
task:syz.6.8477 state:R running task stack:25512 pid:8856 tgid:8850 ppid:2993 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7662
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:543 [inline]
irqentry_exit+0x14f/0x9b0 kernel/entry/common.c:154
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:55 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:409 [inline]
RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:419 [inline]
RIP: 0010:unwind_next_frame+0xb46/0x2550 arch/x86/kernel/unwind_orc.c:614
Code: 00 83 fe 02 0f 85 a2 07 00 00 48 89 5c 24 48 49 8d 7e 08 48 89 fb 48 c1 eb 03 42 80 3c 23 00 74 09 e8 de 6e c7 00 4c 8b 04 24 <4d> 8b 7e 08 49 8d 7e 10 49 89 fc 49 c1 ec 03 48 b8 00 00 00 00 00
RSP: 0018:ffffc9000590ee60 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 1ffff92000b21de2 RCX: ffffffff91c08154
RDX: ffffffff92452d6e RSI: 0000000000000002 RDI: ffffc9000590ef10
RBP: 1ffffffff248a5ad R08: ffffc9000590f340 R09: 0000000000000000
R10: ffffc9000590ef58 R11: ffffffff81b3a880 R12: dffffc0000000000
R13: ffffffff92452d6a R14: ffffc9000590ef08 R15: 1ffff92000b21de1
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
save_stack+0x122/0x230 mm/page_owner.c:183
__reset_page_owner+0x73/0x2a0 mm/page_owner.c:338
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1403 [inline]
__free_frozen_pages+0xc97/0xd90 mm/page_alloc.c:2954
__slab_free+0x269/0x2c0 mm/slub.c:5926
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_kmalloc+0x22/0xb0 mm/kasan/common.c:417
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5531 [inline]
__kmalloc_node_track_caller_noprof+0x4af/0x720 mm/slub.c:5662
__kmemdup_nul mm/util.c:64 [inline]
kstrdup+0x42/0x100 mm/util.c:84
__kernfs_new_node+0xa9/0x980 fs/kernfs/dir.c:663
kernfs_new_node+0xeb/0x140 fs/kernfs/dir.c:759
__kernfs_create_file+0x4b/0x2e0 fs/kernfs/file.c:1071
sysfs_add_file_mode_ns+0x237/0x300 fs/sysfs/file.c:316
create_files fs/sysfs/group.c:82 [inline]
internal_create_group+0x679/0x1180 fs/sysfs/group.c:189
internal_create_groups fs/sysfs/group.c:229 [inline]
sysfs_create_groups+0x59/0x120 fs/sysfs/group.c:255
setup_gid_attrs drivers/infiniband/core/sysfs.c:1123 [inline]
ib_setup_port_attrs+0x1780/0x2460 drivers/infiniband/core/sysfs.c:1399
add_one_compat_dev+0x441/0x640 drivers/infiniband/core/device.c:1002
rdma_dev_init_net+0x23e/0x2f0 drivers/infiniband/core/device.c:1227
ops_init+0x35d/0x5d0 net/core/net_namespace.c:137
setup_net+0x118/0x350 net/core/net_namespace.c:443
copy_net_ns+0x536/0x770 net/core/net_namespace.c:582
create_new_namespaces+0x3f0/0x6b0 kernel/nsproxy.c:132
unshare_nsproxy_namespaces+0x144/0x190 kernel/nsproxy.c:234
ksys_unshare+0x532/0x890 kernel/fork.c:3292
__do_sys_unshare kernel/fork.c:3358 [inline]
__se_sys_unshare kernel/fork.c:3356 [inline]
__x64_sys_unshare+0x38/0x50 kernel/fork.c:3356
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc1e979fb19
RSP: 002b:00007fc1ea673028 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fc1e9a26270 RCX: 00007fc1e979fb19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000064000600
RBP: 00007fc1e9837b70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc1e9a26308 R14: 00007fc1e9a26270 R15: 00007ffcf4f7e988
rcu: rcu_preempt kthread starved for 221 jiffies! g240657 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->cpu=1
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:26848 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x1230 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9c/0x340 kernel/rcu/tree.c:2330
kthread+0x38b/0x480 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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 29365 Comm: kworker/u8:28 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:lock_class_cache_is_valid kernel/locking/lockdep.c:981 [inline]
RIP: 0010:__lock_acquire+0xd9/0x2de0 kernel/locking/lockdep.c:5155
Code: 4f 48 c7 c1 90 e9 66 95 48 89 c2 48 29 ca 48 c1 fa 03 48 b9 29 5c 8f c2 f5 28 5c 8f 48 0f af ca 48 0f a3 0d 79 ca 21 14 73 26 <48> 8b 0b 48 85 c9 74 1e ba 01 00 00 00 85 f6 75 09 8b 50 58 48 83
RSP: 0018:ffffc90000a07bd8 EFLAGS: 00000803
RAX: ffffffff9566ef08 RBX: ffffffff8ff5a320 RCX: 0000000000000007
RDX: 00000000000000af RSI: 0000000000000000 RDI: ffffffff8ff5a320
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90000a07eb8 R11: ffffffff81b3a880 R12: ffffffff8ff5a320
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88812371d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556e7b54e8 CR3: 000000000fd48000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:351 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:377
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4720 [inline]
slab_alloc_node mm/slub.c:5033 [inline]
kmem_cache_alloc_noprof+0x2b4/0x600 mm/slub.c:5047
skb_clone+0x212/0x3a0 net/core/skbuff.c:2110
deliver_clone net/bridge/br_forward.c:140 [inline]
maybe_deliver+0x350/0x5b0 net/bridge/br_forward.c:212
br_flood+0x142/0x650 net/bridge/br_forward.c:345
br_handle_frame_finish+0x11fc/0x1ae0 net/bridge/br_input.c:231
br_nf_hook_thresh net/bridge/br_netfilter_hooks.c:1166 [inline]
br_nf_pre_routing_finish+0x138a/0x1a10 net/bridge/br_netfilter_hooks.c:431
NF_HOOK+0x64e/0x6e0 include/linux/netfilter.h:325
br_nf_pre_routing+0xec2/0x14b0 net/bridge/br_netfilter_hooks.c:540
nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:293 [inline]
br_handle_frame+0x1329/0x1600 net/bridge/br_input.c:453
__netif_receive_skb_core+0x989/0x30f0 net/core/dev.c:6314
__netif_receive_skb_one_core net/core/dev.c:6433 [inline]
__netif_receive_skb net/core/dev.c:6548 [inline]
process_backlog+0x727/0x18b0 net/core/dev.c:6899
__napi_poll+0xaa/0x330 net/core/dev.c:7985
napi_poll net/core/dev.c:8048 [inline]
net_rx_action+0x61d/0xf50 net/core/dev.c:8205
handle_softirqs+0x265/0x8d0 kernel/softirq.c:669
__do_softirq kernel/softirq.c:703 [inline]
invoke_softirq kernel/softirq.c:542 [inline]
__irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786
irq_exit_rcu+0x9/0x30 kernel/softirq.c:809
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:csd_lock_wait kernel/smp.c:389 [inline]
RIP: 0010:smp_call_function_many_cond+0x1132/0x1500 kernel/smp.c:1028
Code: 78 44 8b 2b 44 89 ee 83 e6 01 31 ff e8 17 6f 0c 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 f2 69 0c 00 eb 35 f3 90 <43> 0f b6 04 2c 84 c0 75 0f f7 03 01 00 00 00 74 1d e8 d8 69 0c 00
RSP: 0018:ffffc900033e7720 EFLAGS: 00000293
RAX: ffffffff81bcabf8 RBX: ffff8880b8244028 RCX: ffff8880274a9f40
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900033e7870 R08: ffffffff919d74bf R09: 1ffffffff233ae97
R10: dffffc0000000000 R11: fffffbfff233ae98 R12: 1ffff11017048805
R13: dffffc0000000000 R14: 1ffff11004e9569b R15: 0000000000000000
on_each_cpu include/linux/smp.h:71 [inline]
smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2642 [inline]
smp_text_poke_batch_finish+0x5f8/0x1110 arch/x86/kernel/alternative.c:2852
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_enable_cpuslocked+0x128/0x240 kernel/jump_label.c:210
static_key_enable+0x1a/0x20 kernel/jump_label.c:223
toggle_allocation_gate+0xab/0x290 mm/kfence/core.c:902
process_one_work kernel/workqueue.c:3495 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659
kthread+0x38b/0x480 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
net_ratelimit: 6 callbacks suppressed
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog