rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4935/1:b..l P42/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=157689, q=683 ncpus=2)
task:kworker/u4:2 state:R running task stack:20728 pid:42 tgid:42 ppid:2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
context_switch kernel/sched/core.c:5376 [inline]
__schedule+0x1961/0x4ab0 kernel/sched/core.c:6688
preempt_schedule_irq+0xfb/0x1b0 kernel/sched/core.c:7008
irqentry_exit+0x5a/0x80 kernel/entry/common.c:432
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:650
RIP: 0010:rcu_is_watching+0x70/0xb0 kernel/rcu/tree.c:702
Code: c3 08 6c 03 00 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 1e 8b 03 65 ff 0d b1 19 8d 7e 74 0c 83 e0 04 c1 e8 02 5b <41> 5e 41 5f c3 e8 a6 e7 89 ff eb ed 89 d9 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc90000b2fb80 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffff888019a6bb80
RDX: ffff888019a6bb80 RSI: ffffffff8bbdf460 RDI: ffffffff8bbdf420
RBP: 0000000000000000 R08: ffffffff8ae5391e R09: 1ffffffff21ba86c
R10: dffffc0000000000 R11: fffffbfff21ba86d R12: ffff888025accc80
R13: 0000000000000338 R14: ffffffff8d349940 R15: dffffc0000000000
rcu_read_unlock include/linux/rcupdate.h:776 [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:2630 [inline]
process_scheduled_works+0x90f/0x1420 kernel/workqueue.c:2703
worker_thread+0xa5f/0x1000 kernel/workqueue.c:2784
kthread+0x2d3/0x370 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
task:syz-executor.3 state:R running task stack:20080 pid:4935 tgid:4935 ppid:4933 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5376 [inline]
__schedule+0x1961/0x4ab0 kernel/sched/core.c:6688
preempt_schedule_common+0x83/0xc0 kernel/sched/core.c:6865
preempt_schedule+0xdd/0xf0 kernel/sched/core.c:6889
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3a/0x40 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
copy_pte_range mm/memory.c:1115 [inline]
copy_pmd_range mm/memory.c:1176 [inline]
copy_pud_range mm/memory.c:1213 [inline]
copy_p4d_range mm/memory.c:1237 [inline]
copy_page_range+0x3793/0x43e0 mm/memory.c:1335
dup_mmap kernel/fork.c:758 [inline]
dup_mm kernel/fork.c:1691 [inline]
copy_mm+0x11fc/0x1f10 kernel/fork.c:1740
copy_process+0x1d6f/0x3fb0 kernel/fork.c:2502
kernel_clone+0x222/0x840 kernel/fork.c:2907
__do_sys_clone kernel/fork.c:3050 [inline]
__se_sys_clone kernel/fork.c:3034 [inline]
__x64_sys_clone+0x258/0x2a0 kernel/fork.c:3034
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f9ec7879b13
RSP: 002b:00007fff3e557d38 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9ec7879b13
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000555555daa750 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001
rcu: rcu_preempt kthread starved for 10556 jiffies! g157689 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:25008 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5376 [inline]
__schedule+0x1961/0x4ab0 kernel/sched/core.c:6688
__schedule_loop kernel/sched/core.c:6763 [inline]
schedule+0x149/0x260 kernel/sched/core.c:6778
schedule_timeout+0x1bd/0x300 kernel/time/timer.c:2167
rcu_gp_fqs_loop+0x30a/0x1500 kernel/rcu/tree.c:1631
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:1830
kthread+0x2d3/0x370 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
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: 5972 Comm: syz-executor.5 Not tainted 6.7.0-rc2-syzkaller-00095-gd3fa86b1a7b4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:rcu_preempt_read_exit kernel/rcu/tree_plugin.h:384 [inline]
RIP: 0010:__rcu_read_unlock+0x2e/0x100 kernel/rcu/tree_plugin.h:423
Code: 55 41 57 41 56 41 55 41 54 53 49 bc 00 00 00 00 00 fc ff df 65 4c 8b 35 30 4e 8c 7e 4d 8d ae 3c 04 00 00 4c 89 eb 48 c1 eb 03 <42> 0f b6 04 23 84 c0 75 63 41 8b 6d 00 ff cd 42 0f b6 04 23 84 c0
RSP: 0018:ffffc900001f0ba0 EFLAGS: 00000807
RAX: ffffffff81581308 RBX: 1ffff110067e243f RCX: ffff888033f11dc0
RDX: 0000000080010003 RSI: ffffffff8bbdf460 RDI: ffffffff8bbdf420
RBP: ffffc900001f0c80 R08: ffffffff815812f6 R09: fffff5200003e158
R10: dffffc0000000000 R11: fffff5200003e158 R12: dffffc0000000000
R13: ffff888033f121fc R14: ffff888033f11dc0 R15: 1ffff9200003e190
FS: 00007fe510be56c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe510be4f00 CR3: 00000000339ea000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rcu_read_unlock include/linux/rcupdate.h:779 [inline]
__lock_task_sighand+0x2a5/0x2d0 kernel/signal.c:1427
lock_task_sighand include/linux/sched/signal.h:745 [inline]
send_sigqueue+0x25c/0x760 kernel/signal.c:1996
posix_timer_event kernel/time/posix-timers.c:298 [inline]
posix_timer_fn+0x18a/0x390 kernel/time/posix-timers.c:324
__run_hrtimer kernel/time/hrtimer.c:1688 [inline]
__hrtimer_run_queues+0x59f/0xd20 kernel/time/hrtimer.c:1752
hrtimer_interrupt+0x396/0x980 kernel/time/hrtimer.c:1814
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline]
__sysvec_apic_timer_interrupt+0x104/0x3a0 arch/x86/kernel/apic/apic.c:1082
sysvec_apic_timer_interrupt+0x92/0xb0 arch/x86/kernel/apic/apic.c:1076
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 00 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 8a e4 4b f6 48 89 df e8 c2 1e 4d f6 e8 7d f3 73 f6 fb bf 01 00 00 00 a2 44 3f f6 65 8b 05 63 52 e2 74 85 c0 74 02 5b c3 e8 30 20 df
RSP: 0018:ffffc9000cf3fc50 EFLAGS: 00000282
RAX: 8fff3b0b42570f00 RBX: ffff8880202e0000 RCX: ffffffff925cc303
RDX: dffffc0000000000 RSI: ffffffff8b6aaf60 RDI: 0000000000000001
RBP: ffffc9000cf3fd90 R08: ffffffff8f00c2ef R09: 1ffffffff1e0185d
R10: dffffc0000000000 R11: fffffbfff1e0185e R12: 1ffff1100405c093
R13: 000000001c000004 R14: 0000000000000021 R15: ffff8880202e0498
spin_unlock_irq include/linux/spinlock.h:401 [inline]
get_signal+0x1569/0x1840 kernel/signal.c:2907
arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:309
exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168
exit_to_user_mode_prepare+0xb1/0x150 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x69/0x2a0 kernel/entry/common.c:296
do_syscall_64+0x52/0x110 arch/x86/entry/common.c:88
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fe50fe7cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe510be50c8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007fe50ff9bf80 RCX: 00007fe50fe7cae9
RDX: 000000002006b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fe50fec847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fe50ff9bf80 R15: 00007fff7eeffcc8