rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P27889/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=124833, q=705 ncpus=2)
task:syz.1.9704 state:R running task stack:26752 pid:27889 tgid:27878 ppid:5624 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x17b4/0x5680 kernel/sched/core.c:7188
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7369
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__local_bh_enable_ip+0xe1/0x130 kernel/softirq.c:457
local_bh_enable include/linux/bottom_half.h:33 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:912 [inline]
__dev_queue_xmit+0x1fe5/0x3950 net/core/dev.c:4905
dev_queue_xmit include/linux/netdevice.h:3418 [inline]
__netlink_deliver_tap_skb net/netlink/af_netlink.c:307 [inline]
__netlink_deliver_tap+0x5ad/0x850 net/netlink/af_netlink.c:325
netlink_deliver_tap+0x19c/0x1b0 net/netlink/af_netlink.c:338
netlink_deliver_tap_kernel net/netlink/af_netlink.c:347 [inline]
netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
netlink_unicast+0x730/0x8e0 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:787 [inline]
__sock_sendmsg net/socket.c:802 [inline]
____sys_sendmsg+0x972/0x9f0 net/socket.c:2698
___sys_sendmsg+0x2a5/0x360 net/socket.c:2752
__sys_sendmsg net/socket.c:2784 [inline]
__do_sys_sendmsg net/socket.c:2789 [inline]
__se_sys_sendmsg net/socket.c:2787 [inline]
__x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2787
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd28a39cdd9
RSP: 002b:00007fd2885f6028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fd28a616180 RCX: 00007fd28a39cdd9
RDX: 0000000000004000 RSI: 0000200000000200 RDI: 0000000000000006
RBP: 00007fd28a432d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd28a616218 R14: 00007fd28a616180 R15: 00007fff94630a78
rcu: rcu_preempt kthread starved for 389 jiffies! g124833 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:27544 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x17b4/0x5680 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7282
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+0x388/0x470 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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 22730 Comm: kworker/R-bond4 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: 0x0 (bond4)
RIP: 0010:find_held_lock kernel/locking/lockdep.c:-1 [inline]
RIP: 0010:__lock_release kernel/locking/lockdep.c:5535 [inline]
RIP: 0010:lock_release+0x111/0x3c0 kernel/locking/lockdep.c:5889
Code: 24 83 f8 32 0f 83 2a 02 00 00 4a 8d 1c ad 00 00 00 00 4c 01 eb 48 8d 6c dd 00 48 89 ef 4c 89 f6 e8 a4 49 06 0a 44 89 64 24 14 <45> 89 e5 85 c0 0f 84 d7 00 00 00 48 85 ed 0f 84 13 01 00 00 83 7d
RSP: 0018:ffffc90000a08308 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000014 RCX: 0000000080010101
RDX: 0000000000000001 RSI: ffff8880b8728298 RDI: ffff888056ce8c30
RBP: ffff888056ce8c30 R08: ffff888056ce8007 R09: 1ffff1100ad9d000
R10: dffffc0000000000 R11: ffffed100ad9d001 R12: 0000000000000004
R13: 0000000000000004 R14: ffff8880b8728298 R15: ffff888056ce8000
FS: 0000000000000000(0000) GS:ffff888125390000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feac0ae6ff8 CR3: 000000007f1e8000 CR4: 00000000003526f0
Call Trace:
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:176 [inline]
_raw_spin_unlock_irqrestore+0x1b/0x80 kernel/locking/spinlock.c:198
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+0x52/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:217 [inline]
RIP: 0010:unwind_next_frame+0x1c6/0x2550 arch/x86/kernel/unwind_orc.c:510
Code: 24 10 74 08 4c 89 ff e8 d8 03 ba 00 4d 8b 27 48 83 f3 01 48 c7 c2 20 a5 c9 8b 49 29 dc 0f 84 b2 02 00 00 49 81 fc 00 00 00 81 <0f> 92 c0 49 81 fc e8 eb ab 8b 0f 93 c1 08 c1 0f 85 05 01 00 00 48
RSP: 0018:ffffc90000a08478 EFLAGS: 00000202
RAX: 1ffff920001410be RBX: 0000000000000001 RCX: 0000000080000101
RDX: ffffffff8bc9a520 RSI: ffffffff8c28abc0 RDI: ffffffff8c28ab80
RBP: dffffc0000000000 R08: ffffffff8176e256 R09: ffffffff8e95cd60
R10: ffffc90000a085a8 R11: fffff520001410c1 R12: ffffffff81770cd6
R13: 1ffff920001410b5 R14: ffffc90000a085a8 R15: ffffc90000a085f0
__unwind_start+0x5b8/0x760 arch/x86/kernel/unwind_orc.c:787
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24
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:340 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4569 [inline]
slab_alloc_node mm/slub.c:4898 [inline]
kmem_cache_alloc_node_noprof+0x384/0x690 mm/slub.c:4950
kmalloc_reserve net/core/skbuff.c:613 [inline]
__alloc_skb+0x27d/0x7d0 net/core/skbuff.c:713
skb_copy+0x188/0x800 net/core/skbuff.c:2182
can_can_gw_rcv+0x46d/0xf70 net/can/gw.c:507
deliver net/can/af_can.c:575 [inline]
can_rcv_filter+0x126/0x7a0 net/can/af_can.c:602
can_receive+0x2c6/0x440 net/can/af_can.c:674
can_rcv+0x1f9/0x330 net/can/af_can.c:699
__netif_receive_skb_one_core net/core/dev.c:6202 [inline]
__netif_receive_skb net/core/dev.c:6315 [inline]
process_backlog+0xc66/0x1950 net/core/dev.c:6666
__napi_poll+0xae/0x340 net/core/dev.c:7730
napi_poll net/core/dev.c:7793 [inline]
net_rx_action+0x627/0xf70 net/core/dev.c:7950
handle_softirqs+0x22a/0x840 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:pool_allowed_cpus kernel/workqueue.c:2699 [inline]
RIP: 0010:worker_attach_to_pool+0x18f/0x3a0 kernel/workqueue.c:2732
Code: bd 00 00 00 00 00 fc ff df 80 3c 28 00 74 08 4c 89 e7 e8 24 da a1 00 49 8b 04 24 4c 8d 60 18 4c 89 e1 48 c1 e9 03 0f b6 0c 29 <84> c9 0f 85 e5 01 00 00 41 80 3c 24 00 74 11 48 89 c3 e8 fa 9e 36
RSP: 0018:ffffc9000d08fc88 EFLAGS: 00000a06
RAX: ffff88813fe7ad00 RBX: 0000000000000006 RCX: 0000000000000000
RDX: ffff888056ce8000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff9030a2f7 R09: 1ffffffff206145e
R10: dffffc0000000000 R11: fffffbfff206145f R12: ffff88813fe7ad18
R13: ffff88801aea3000 R14: ffff88808cb66a00 R15: ffff888056ce8000
rescuer_thread+0x35c/0x1130 kernel/workqueue.c:3602
kthread+0x388/0x470 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