rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6346/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=11001, q=804 ncpus=2)
task:syz.1.80 state:R running task stack:24560 pid:6346 tgid:6343 ppid:5822 task_flags:0x400140 flags:0x00080003
Call Trace:
context_switch kernel/sched/core.c:5254 [inline]
__schedule+0x17c4/0x4d60 kernel/sched/core.c:6862
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7189
irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:unwind_next_frame+0xb13/0x2390 arch/x86/include/asm/stacktrace.h:-1
Code: 78 4d 8b 7e 08 49 8d 5e 10 49 89 dd 49 c1 ed 03 48 b8 00 00 00 00 00 fc ff df 41 80 7c 05 00 00 74 08 48 89 df e8 dd fb b2 00 <48> 89 9c 24 88 00 00 00 49 8d 5c 24 f8 4d 8b 66 10 48 b8 00 00 00
RSP: 0018:ffffc90003bdf278 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffffc90003bdf358 RCX: ffffffff8fe9689c
RDX: ffffffff90906bc6 RSI: 0000000000000002 RDI: ffffffff8bbf2560
RBP: 1ffff9200077be6a R08: 0000000000000001 R09: ffffffff8173cf85
R10: ffffc90003bdf398 R11: ffffffff81acafb0 R12: ffffc90003bdfbc0
R13: 1ffff9200077be6b R14: ffffc90003bdf348 R15: ffffc90003bd8000
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
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
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:252 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:234 [inline]
slab_free_hook mm/slub.c:2553 [inline]
slab_free mm/slub.c:6644 [inline]
kmem_cache_free+0x19b/0x690 mm/slub.c:6754
skb_release_data+0x62d/0x7c0 net/core/skbuff.c:1090
skb_release_all net/core/skbuff.c:1164 [inline]
__kfree_skb net/core/skbuff.c:1178 [inline]
consume_skb+0x9e/0xf0 net/core/skbuff.c:1410
netlink_broadcast_filtered+0xec7/0x1000 net/netlink/af_netlink.c:1535
nlmsg_multicast_filtered include/net/netlink.h:1165 [inline]
nlmsg_multicast include/net/netlink.h:1184 [inline]
nlmsg_notify+0xf0/0x1a0 net/netlink/af_netlink.c:2593
__addrconf_sysctl_register+0x451/0x4c0 net/ipv6/addrconf.c:7334
addrconf_init_net+0x4f9/0x790 net/ipv6/addrconf.c:7447
ops_init+0x35c/0x5c0 net/core/net_namespace.c:137
setup_net+0xfe/0x320 net/core/net_namespace.c:446
copy_net_ns+0x34e/0x4e0 net/core/net_namespace.c:581
create_new_namespaces+0x3f3/0x720 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x11c/0x170 kernel/nsproxy.c:218
ksys_unshare+0x4c8/0x8c0 kernel/fork.c:3129
__do_sys_unshare kernel/fork.c:3200 [inline]
__se_sys_unshare kernel/fork.c:3198 [inline]
__x64_sys_unshare+0x38/0x50 kernel/fork.c:3198
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff34bf8efc9
RSP: 002b:00007ff34ce1c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007ff34c1e6090 RCX: 00007ff34bf8efc9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000060000480
RBP: 00007ff34c011f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff34c1e6128 R14: 00007ff34c1e6090 R15: 00007ffd3b2e9938
rcu: rcu_preempt kthread timer wakeup didn't happen for 10480 jiffies! g11001 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=8104
rcu: rcu_preempt kthread starved for 10481 jiffies! g11001 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27192 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5254 [inline]
__schedule+0x17c4/0x4d60 kernel/sched/core.c:6862
__schedule_loop kernel/sched/core.c:6944 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6959
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+0x4bc/0x870 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: 1 UID: 0 PID: 1301 Comm: aoe_tx0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 ab e9 70 f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 f3 e6 38 f6 65 8b 05 8c 44 1c 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc900041ef640 EFLAGS: 00000206
RAX: 98adaf87cd583600 RBX: 0000000000000a02 RCX: 98adaf87cd583600
RDX: 0000000000000002 RSI: ffffffff8d77b493 RDI: 0000000000000001
RBP: ffffc900041ef6c8 R08: ffffffff8f7d6777 R09: 1ffffffff1efacee
R10: dffffc0000000000 R11: fffffbfff1efacef R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff99b43b20 R15: 1ffff9200083dec8
FS: 0000000000000000(0000) GS:ffff888125fe5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30d08ff8 CR3: 0000000078228000 CR4: 00000000003526f0
Call Trace:
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
uart_port_unlock_irqrestore include/linux/serial_core.h:788 [inline]
uart_port_unlock_deref+0x111/0x2f0 drivers/tty/serial/serial_core.c:91
uart_write+0xc9/0x130 drivers/tty/serial/serial_core.c:626
handle_tx+0x23f/0x610 drivers/net/caif/caif_serial.c:222
__netdev_start_xmit include/linux/netdevice.h:5272 [inline]
netdev_start_xmit include/linux/netdevice.h:5281 [inline]
xmit_one net/core/dev.c:3853 [inline]
dev_hard_start_xmit+0x2d7/0x830 net/core/dev.c:3869
__dev_queue_xmit+0x172a/0x3740 net/core/dev.c:4811
dev_queue_xmit include/linux/netdevice.h:3372 [inline]
tx+0x6b/0x190 drivers/block/aoe/aoenet.c:62
kthread+0x1d0/0x3e0 drivers/block/aoe/aoecmd.c:1241
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245