rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P1093/1:b..l P11486/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=57237, q=481 ncpus=2)
task:syz-executor state:R running task stack:24272 pid:11486 tgid:11486 ppid:11473 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5758
Code: 2b 00 74 08 4c 89 f7 e8 3a 6b 89 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc9000cd375e0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff920019a6ec8 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8bcacd00 RDI: ffffffff8c1feb80
RBP: ffffc9000cd37740 R08: ffffffff92fa7587 R09: 1ffffffff25f4eb0
R10: dffffc0000000000 R11: fffffbfff25f4eb1 R12: 1ffff920019a6ec4
R13: dffffc0000000000 R14: ffffc9000cd37640 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
rcu_read_lock include/linux/rcupdate.h:781 [inline]
in6_dev_get+0x39/0x290 include/net/addrconf.h:369
__ipv6_dev_mc_inc+0x51/0xa90 net/ipv6/mcast.c:915
ipv6_add_dev+0xe12/0x1220 net/ipv6/addrconf.c:471
addrconf_notify+0x6a7/0x1020 net/ipv6/addrconf.c:3652
notifier_call_chain+0x1a1/0x3e0 kernel/notifier.c:93
call_netdevice_notifiers_extack net/core/dev.c:2030 [inline]
call_netdevice_notifiers net/core/dev.c:2044 [inline]
register_netdevice+0x1570/0x19e0 net/core/dev.c:10408
register_netdev+0x3b/0x50 net/core/dev.c:10512
vti6_init_net+0x233/0x2f0 net/ipv6/ip6_vti.c:1155
ops_init+0x35b/0x610 net/core/net_namespace.c:139
setup_net+0x515/0xca0 net/core/net_namespace.c:343
copy_net_ns+0x4e2/0x7b0 net/core/net_namespace.c:508
create_new_namespaces+0x425/0x7b0 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228
ksys_unshare+0x619/0xc10 kernel/fork.c:3323
__do_sys_unshare kernel/fork.c:3394 [inline]
__se_sys_unshare kernel/fork.c:3392 [inline]
__x64_sys_unshare+0x38/0x40 kernel/fork.c:3392
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9ab4d77247
RSP: 002b:00007ffe8a5ab728 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f9ab4f03f60 RCX: 00007f9ab4d77247
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007f9ab4f049f8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000c
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000009
task:kworker/u8:8 state:R running task stack:20400 pid:1093 tgid:1093 ppid:2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
preempt_schedule_notrace+0x100/0x140 kernel/sched/core.c:7017
preempt_schedule_notrace_thunk+0x1a/0x30 arch/x86/entry/thunk.S:13
rcu_is_watching+0x7e/0xb0 kernel/rcu/tree.c:725
rcu_read_unlock include/linux/rcupdate.h:810 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline]
batadv_nc_worker+0x207/0x610 net/batman-adv/network-coding.c:719
process_one_work kernel/workqueue.c:3231 [inline]
process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3312
worker_thread+0x86d/0xd70 kernel/workqueue.c:3393
kthread+0x2f2/0x390 kernel/kthread.c:389
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
rcu: rcu_preempt kthread starved for 10563 jiffies! g57237 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:25168 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
__schedule_loop kernel/sched/core.c:6822 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6837
schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2000
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202
kthread+0x2f2/0x390 kernel/kthread.c:389
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 11494 Comm: syz.3.1732 Not tainted 6.10.0-rc5-syzkaller-00018-g55027e689933 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:handle_signal arch/x86/kernel/signal.c:263 [inline]
RIP: 0010:arch_do_signal_or_restart+0x216/0x860 arch/x86/kernel/signal.c:312
Code: 08 00 00 00 e8 ab 78 c9 00 4c 89 e0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 e7 e8 25 76 c9 00 49 8b 1c 24 48 89 de 48 83 e6 10 <31> ff e8 03 ce 63 00 48 83 e3 10 48 89 1c 24 4c 8d 6c 24 40 0f 85
RSP: 0018:ffffc9000306fdc0 EFLAGS: 00000246
RAX: 1ffff1100222b3c0 RBX: 0000000000000000 RCX: ffffffff81325c45
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888011159e00
RBP: ffffc9000306fec8 R08: ffff888011159e07 R09: 1ffff1100222b3c0
R10: dffffc0000000000 R11: ffffed100222b3c1 R12: ffff888011159e00
R13: ffffc9000306ff58 R14: 1ffff9200060dfbc R15: dffffc0000000000
FS: 00007ff0298746c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000cffc CR3: 0000000066ed6000 CR4: 0000000000350ef0
Call Trace:
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff028b75ae7
Code: ff ff 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
RSP: 002b:00007ff029874048 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007ff028d03fa0 RCX: 00007ff028b75ae9
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 000000002000cffc
RBP: 00007ff028bf6746 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007ff028d03fa0 R15: 00007ffd4363ee18