rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5885/1:b..l P5139/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=12497, q=531 ncpus=2)
task:udevd state:R running task stack:25160 pid:5139 ppid:1 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6867
preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6891
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0x111/0x120 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
__wake_up_common_lock kernel/sched/wait.c:140 [inline]
__wake_up_sync_key+0x12c/0x1a0 kernel/sched/wait.c:213
sock_def_readable+0x1e1/0x420 net/core/sock.c:3354
__netlink_sendskb net/netlink/af_netlink.c:1266 [inline]
netlink_sendskb+0x9b/0x130 net/netlink/af_netlink.c:1272
netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5ba/0x960 net/socket.c:2594
___sys_sendmsg+0x2a6/0x360 net/socket.c:2648
__sys_sendmsg net/socket.c:2677 [inline]
__do_sys_sendmsg net/socket.c:2686 [inline]
__se_sys_sendmsg+0x1c2/0x2b0 net/socket.c:2684
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f92e6ea7407
RSP: 002b:00007ffea3cb6dc0 EFLAGS: 00000202 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f92e7578880 RCX: 00007f92e6ea7407
RDX: 0000000000000000 RSI: 00007ffea3cb6e20 RDI: 0000000000000004
RBP: 0000555aa5eccab0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00000000000000b3
R13: 0000555aa5e579e0 R14: 0000000000000000 R15: 0000000000000000
task:syz-executor state:R running task stack:21704 pid:5885 ppid:5883 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7010
irqentry_exit+0x67/0x70 kernel/entry/common.c:438
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:ipv6_store_devconf net/ipv6/addrconf.c:5637 [inline]
RIP: 0010:inet6_fill_ifla6_attrs+0x522/0x21f0 net/ipv6/addrconf.c:5816
Code: 8d bd 04 06 00 00 4c 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 98 10 00 00 49 63 3f e8 36 21 3b f8 4d 8d bc 24 b0 00 00 00 <4c> 89 f9 48 c1 e9 03 42 0f b6 0c 31 84 c9 0f 85 92 10 00 00 41 89
RSP: 0018:ffffc900036e6980 EFLAGS: 00000202
RAX: 000000000036ee80 RBX: 00000000ffffffff RCX: ffff888023f33c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000057e40
RBP: ffffc900036e6aa0 R08: ffff88807db50413 R09: 0000000000000000
R10: ffff88807db50328 R11: ffffed100fb6a083 R12: ffff88807db50324
R13: ffff8880771a6000 R14: dffffc0000000000 R15: ffff88807db503d4
inet6_fill_link_af+0x9b/0x120 net/ipv6/addrconf.c:5862
rtnl_fill_link_af+0x1c2/0x430 net/core/rtnetlink.c:1701
rtnl_fill_ifinfo+0x1bb6/0x1e50 net/core/rtnetlink.c:1931
rtmsg_ifinfo_build_skb+0x18e/0x260 net/core/rtnetlink.c:4072
rtmsg_ifinfo_event net/core/rtnetlink.c:4106 [inline]
rtmsg_ifinfo+0x8c/0x1a0 net/core/rtnetlink.c:4115
register_netdevice+0x17b8/0x1bb0 net/core/dev.c:10340
cfg80211_register_netdevice+0x159/0x2f0 net/wireless/core.c:1457
ieee80211_if_add+0xa1b/0x14e0 net/mac80211/iface.c:2270
ieee80211_register_hw+0x35ca/0x4250 net/mac80211/main.c:1441
mac80211_hwsim_new_radio+0x2a00/0x4d10 drivers/net/wireless/virtual/mac80211_hwsim.c:5307
hwsim_new_radio_nl+0xdc9/0x1a90 drivers/net/wireless/virtual/mac80211_hwsim.c:5988
genl_family_rcv_msg_doit+0x211/0x310 net/netlink/genetlink.c:971
genl_family_rcv_msg net/netlink/genetlink.c:1051 [inline]
genl_rcv_msg+0x619/0x7a0 net/netlink/genetlink.c:1066
netlink_rcv_skb+0x241/0x4d0 net/netlink/af_netlink.c:2545
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1075
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
__sys_sendto+0x4a9/0x6b0 net/socket.c:2200
__do_sys_sendto net/socket.c:2212 [inline]
__se_sys_sendto net/socket.c:2208 [inline]
__x64_sys_sendto+0xde/0xf0 net/socket.c:2208
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb34955cece
RSP: 002b:00007ffe9d4ffb38 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000055555bba5500 RCX: 00007fb34955cece
RDX: 0000000000000024 RSI: 00007fb34a344670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffe9d4ffbb4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 00007fb34a344670 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 10583 jiffies! g12497 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:27656 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x313/0x1590 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5754 Comm: kworker/0:3 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: events nsim_fib_event_work
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:-1 [inline]
RIP: 0010:debug_check_no_obj_freed+0x1e6/0x540 lib/debugobjects.c:1020
Code: 0f 84 40 03 00 00 49 89 ee 49 c1 ee 03 41 80 3c 16 00 74 12 48 89 ef e8 38 a1 ae fd 48 ba 00 00 00 00 00 fc ff df 48 8b 45 00 <48> 89 04 24 4c 8d 7d 18 4c 89 f8 48 c1 e8 03 80 3c 10 00 74 12 4c
RSP: 0018:ffffc900046af4f0 EFLAGS: 00000046
RAX: ffff88802e0bb3b8 RBX: 0000000000000000 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffc900046af3e0
RBP: ffff8880605e4dc8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520008d5e7c R12: ffff88807a9d8000
R13: ffff88807a9d0000 R14: 1ffff1100c0bc9b9 R15: 0000000000000004
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 000000002c609000 CR4: 00000000003506f0
Call Trace:
free_pages_prepare mm/page_alloc.c:1187 [inline]
free_unref_page_prepare+0x1da/0x8c0 mm/page_alloc.c:2365
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
__slab_free+0x35a/0x400 mm/slub.c:3736
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767
slab_alloc_node mm/slub.c:3495 [inline]
__kmem_cache_alloc_node+0x13a/0x250 mm/slub.c:3534
kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:721 [inline]
nsim_fib6_rt_create drivers/net/netdevsim/fib.c:547 [inline]
nsim_fib6_rt_insert drivers/net/netdevsim/fib.c:752 [inline]
nsim_fib6_event drivers/net/netdevsim/fib.c:856 [inline]
nsim_fib_event drivers/net/netdevsim/fib.c:889 [inline]
nsim_fib_event_work+0x1123/0x31b0 drivers/net/netdevsim/fib.c:1494
process_one_work kernel/workqueue.c:2634 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2711
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293