rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P17404/1:b..l P20040/1:b..l
(detected by 0, t=10503 jiffies, g=51769, q=99 ncpus=2)
task:syz-executor.4 state:R running task stack:24608 pid:20040 ppid:3768 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5194 [inline]
__schedule+0xbd2/0x55b0 kernel/sched/core.c:6506
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:6818
irqentry_exit+0x31/0x80 kernel/entry/common.c:432
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:654
RIP: 0010:unwind_done arch/x86/include/asm/unwind.h:50 [inline]
RIP: 0010:__unwind_start+0x51b/0x800 arch/x86/kernel/unwind_orc.c:714
Code: ff ff 48 c1 e8 03 48 c1 ee 03 48 bd 00 00 00 00 00 fc ff df 49 89 c5 49 89 f4 49 01 ed 49 01 ec eb 2a 4c 89 ff e8 25 de ff ff <4c> 89 f8 48 c1 e8 03 0f b6 04 28 84 c0 74 08 3c 03 0f 8e 2d 01 00
RSP: 0018:ffffc90003a6e840 EFLAGS: 00000282
RAX: 0000000000000001 RBX: ffffc90003a6e918 RCX: 0000000000000000
RDX: 0000000080000000 RSI: ffffc90003a6e918 RDI: 0000000000000001
RBP: dffffc0000000000 R08: ffffffff8e5e483a R09: ffffc90003a6e8c4
R10: fffff5200074dd1d R11: ffffc90003a6e920 R12: fffff5200074dd14
R13: fffff5200074dd13 R14: ffffc90003a6e8c8 R15: ffffc90003a6e890
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0x5c/0xe0 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122
ref_tracker_alloc+0x192/0x550 lib/ref_tracker.c:91
netns_tracker_alloc include/net/net_namespace.h:327 [inline]
nf_nat_masq_schedule.part.0+0x3f8/0x630 net/netfilter/nf_nat_masquerade.c:126
nf_nat_masq_schedule net/netfilter/nf_nat_masquerade.c:108 [inline]
masq_inet6_event net/netfilter/nf_nat_masquerade.c:295 [inline]
masq_inet6_event+0x1e4/0x230 net/netfilter/nf_nat_masquerade.c:279
notifier_call_chain+0xb5/0x200 kernel/notifier.c:87
atomic_notifier_call_chain+0x70/0x180 kernel/notifier.c:225
addrconf_ifdown.isra.0+0xca0/0x19a0 net/ipv6/addrconf.c:3875
addrconf_notify+0xeb/0x1c10 net/ipv6/addrconf.c:3673
notifier_call_chain+0xb5/0x200 kernel/notifier.c:87
call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1945
call_netdevice_notifiers_extack net/core/dev.c:1983 [inline]
call_netdevice_notifiers net/core/dev.c:1997 [inline]
__dev_notify_flags+0x1da/0x2b0 net/core/dev.c:8596
dev_change_flags+0x112/0x170 net/core/dev.c:8632
do_setlink+0x9f1/0x3bb0 net/core/rtnetlink.c:2788
rtnl_setlink+0x236/0x370 net/core/rtnetlink.c:3072
rtnetlink_rcv_msg+0x43a/0xca0 net/core/rtnetlink.c:6091
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2540
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x917/0xe10 net/netlink/af_netlink.c:1921
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:734
sock_write_iter+0x291/0x3d0 net/socket.c:1108
call_write_iter include/linux/fs.h:2190 [inline]
do_iter_readv_writev+0x20b/0x3b0 fs/read_write.c:729
do_iter_write+0x182/0x700 fs/read_write.c:855
vfs_writev+0x1aa/0x630 fs/read_write.c:928
do_writev+0x279/0x2f0 fs/read_write.c:971
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f4be0a8a5a9
RSP: 002b:00007f4be1ccf168 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f4be0babf80 RCX: 00007f4be0a8a5a9
RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000005
RBP: 00007f4be0ae5580 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe8e97d09f R14: 00007f4be1ccf300 R15: 0000000000022000
task:kworker/u4:20 state:R running task stack:27400 pid:17404 ppid:2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
context_switch kernel/sched/core.c:5194 [inline]
__schedule+0xbd2/0x55b0 kernel/sched/core.c:6506
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:6818
irqentry_exit+0x31/0x80 kernel/entry/common.c:432
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:lock_acquire+0x257/0x630 kernel/locking/lockdep.c:5672
Code: 48 c7 43 08 00 00 00 00 48 8b 84 24 b0 00 00 00 65 48 2b 04 25 28 00 00 00 0f 85 42 03 00 00 48 81 c4 b8 00 00 00 5b 5d 41 5c <41> 5d 41 5e 41 5f c3 65 8b 05 1b da a2 7e 85 c0 75 b0 65 8b 05 50
RSP: 0018:ffffc90015a2fc60 EFLAGS: 00000286
RAX: 0000000000000000 RBX: ffff888020cac620 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8de06710
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8de06717
R10: fffffbfff1bc0ce2 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: ffffffff8bf89040 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:304 [inline]
rcu_read_lock include/linux/rcupdate.h:738 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
batadv_nc_worker+0x12d/0xfa0 net/batman-adv/network-coding.c:719
process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e4/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
rcu: rcu_preempt kthread timer wakeup didn't happen for 10490 jiffies! g51769 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=30760
rcu: rcu_preempt kthread starved for 10491 jiffies! g51769 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:29272 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5194 [inline]
__schedule+0xbd2/0x55b0 kernel/sched/core.c:6506
schedule+0xda/0x1b0 kernel/sched/core.c:6582
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1935
rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1658
rcu_gp_kthread+0x236/0x360 kernel/rcu/tree.c:1857
kthread+0x2e4/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 20052 Comm: syz-executor.0 Not tainted 6.0.0-rc6-next-20220923-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:207
Code: 48 89 ef 5d e9 c1 11 34 00 5d be 03 00 00 00 e9 86 2f 9e 07 66 0f 1f 44 00 00 48 8b be a8 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 <65> 8b 05 39 db 85 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b
RSP: 0018:ffffc900001f0db0 EFLAGS: 00000082
RAX: 0000000000000000 RBX: ffff88807c380b40 RCX: 0000000000000000
RDX: 1ffff1100f870167 RSI: ffffffff876733b4 RDI: 0000000000000005
RBP: ffff888078900680 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000001 R12: 00000000ffffffff
R13: ffff888088601600 R14: ffff8880b9b2a540 R15: ffff88807c380b40
FS: 00007f95b446e700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f95b444d718 CR3: 0000000027e70000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
advance_sched+0x14e/0x9a0 net/sched/sch_taprio.c:708
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x690/0xfb0 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1096 [inline]
__sysvec_apic_timer_interrupt+0x17c/0x640 arch/x86/kernel/apic/apic.c:1113
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1107
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:finish_task_switch.isra.0+0x2bf/0xc80 kernel/sched/core.c:5073
Code: 8b 3a 4c 89 e7 48 c7 02 00 00 00 00 ff d1 4d 85 ff 75 bf 4c 89 e7 e8 20 f8 ff ff e8 5b 0a 30 00 fb 65 48 8b 1c 25 80 6f 02 00 <48> 8d bb 70 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc90003cdf970 EFLAGS: 00000246
RAX: 0000000000000007 RBX: ffff8880881d9d40 RCX: 1ffffffff1bc50b4
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff81530cb5
RBP: ffffc90003cdf9b8 R08: 0000000000000000 R09: 0000000000000000
R10: ffffed10173473f0 R11: 0000000000000001 R12: ffff8880b9b39f80
R13: ffff88802e7157c0 R14: 0000000000000000 R15: ffff8880b9b3a9b8
context_switch kernel/sched/core.c:5197 [inline]
__schedule+0xbda/0x55b0 kernel/sched/core.c:6506
schedule+0xda/0x1b0 kernel/sched/core.c:6582
do_wait_intr_irq+0x1c4/0x250 kernel/sched/wait.c:371
timerfd_read+0x4f1/0x940 fs/timerfd.c:278
do_loop_readv_writev fs/read_write.c:750 [inline]
do_loop_readv_writev fs/read_write.c:737 [inline]
do_iter_read+0x4f8/0x750 fs/read_write.c:792
vfs_readv+0xe5/0x150 fs/read_write.c:910
do_readv+0x133/0x2f0 fs/read_write.c:947
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f95b328a5a9
Code: 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f95b446e168 EFLAGS: 00000246 ORIG_RAX: 0000000000000013
RAX: ffffffffffffffda RBX: 00007f95b33abf80 RCX: 00007f95b328a5a9
RDX: 0000000000000001 RSI: 0000000020000640 RDI: 0000000000000003
RBP: 00007f95b32e5580 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffca23361bf R14: 00007f95b446e300 R15: 0000000000022000