rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P9816/1:b..l P10672/1:b..l
(detected by 1, t=10502 jiffies, g=79185, q=7 ncpus=2)
task:syz.2.1322 state:R running task stack:25232 pid:10672 ppid:8677 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874
irqentry_exit+0x63/0x70 kernel/entry/common.c:439
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:lock_acquire+0x225/0x4a0 kernel/locking/lockdep.c:5666
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3d 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 43 c7 44 3d 08 00 00 00 00 65 48 8b 04
RSP: 0018:ffffc9000c8a7360 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 1b15db39ed27c000
RDX: 0000000000000000 RSI: ffffffff8a8c23a0 RDI: ffffffff8adf0c20
RBP: ffffc9000c8a7480 R08: dffffc0000000000 R09: 1ffffffff215e648
R10: dffffc0000000000 R11: fffffbfff215e649 R12: 0000000000000000
R13: 1ffff92001914e78 R14: 0000000000000246 R15: dffffc0000000000
rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
rcu_read_lock include/linux/rcupdate.h:791 [inline]
percpu_ref_get_many+0x35/0x140 include/linux/percpu-refcount.h:202
percpu_ref_get include/linux/percpu-refcount.h:222 [inline]
css_get include/linux/cgroup.h:327 [inline]
charge_memcg+0x159/0x3a0 mm/memcontrol.c:6927
__mem_cgroup_charge+0x21/0x80 mm/memcontrol.c:6944
mem_cgroup_charge include/linux/memcontrol.h:672 [inline]
shmem_add_to_page_cache+0x90d/0x1c50 mm/shmem.c:708
shmem_get_folio_gfp+0x158e/0x3400 mm/shmem.c:1971
shmem_fault+0x1b6/0x780 mm/shmem.c:2156
__do_fault+0x13b/0x4e0 mm/memory.c:4278
do_read_fault mm/memory.c:4629 [inline]
do_fault mm/memory.c:4758 [inline]
handle_pte_fault mm/memory.c:5029 [inline]
__handle_mm_fault mm/memory.c:5171 [inline]
handle_mm_fault+0x2407/0x3ee0 mm/memory.c:5292
faultin_page mm/gup.c:1026 [inline]
__get_user_pages+0x40d/0xec0 mm/gup.c:1250
populate_vma_page_range+0x214/0x2b0 mm/gup.c:1607
__mm_populate+0x25c/0x380 mm/gup.c:1721
mm_populate include/linux/mm.h:2891 [inline]
vm_mmap_pgoff+0x212/0x2d0 mm/util.c:525
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5e3b59acb9
RSP: 002b:00007f5e3c3f2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f5e3b815fa0 RCX: 00007f5e3b59acb9
RDX: b635773f06ebbeef RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007f5e3b608bf7 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5e3b816038 R14: 00007f5e3b815fa0 R15: 00007ffcb3689178
task:kworker/u4:5 state:R running task stack:22320 pid:9816 ppid:2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874
irqentry_exit+0x63/0x70 kernel/entry/common.c:439
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__preempt_count_add kernel/rcu/tree.c:717 [inline]
RIP: 0010:rcu_is_watching+0x2/0xa0 kernel/rcu/tree.c:720
Code: 8a e8 b2 e1 bf 08 48 c7 c7 20 41 b3 8c 4c 89 f6 e8 63 2f cc 02 e9 44 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 41 57 <41> 56 53 65 ff 05 2c fc 95 7e e8 2f f6 bf 08 89 c3 83 f8 08 73 60
RSP: 0018:ffffc90003b77ab0 EFLAGS: 00000257
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff81644064
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8e1fc328
RBP: ffffc90003b77bc8 R08: ffffffff8e1fc32f R09: 1ffffffff1c3f865
R10: dffffc0000000000 R11: fffffbfff1c3f866 R12: 0000000000000000
R13: 1ffff9200076ef64 R14: 0000000000000000 R15: dffffc0000000000
trace_lock_acquire include/trace/events/lock.h:24 [inline]
lock_acquire+0xe3/0x4a0 kernel/locking/lockdep.c:5633
rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
rcu_read_lock include/linux/rcupdate.h:791 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
batadv_nc_worker+0xeb/0x600 net/batman-adv/network-coding.c:719
process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292
worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: rcu_preempt kthread timer wakeup didn't happen for 10565 jiffies! g79185 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=48574
rcu: rcu_preempt kthread starved for 10566 jiffies! g79185 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27184 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
schedule+0xb9/0x180 kernel/sched/core.c:6638
schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x303/0x1340 kernel/rcu/tree.c:1706
rcu_gp_kthread+0x99/0x3b0 kernel/rcu/tree.c:1905
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
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: 10684 Comm: syz.3.1324 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:mark_lock+0x13/0x320 kernel/locking/lockdep.c:4589
Code: 41 89 d9 e9 79 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 41 57 41 56 41 55 41 54 53 50 89 d5 49 89 f6 48 89 fb <49> bd 00 00 00 00 00 fc ff df 83 fa 08 75 29 4d 8d 7e 20 4c 89 f8
RSP: 0018:ffffc90000007980 EFLAGS: 00000006
RAX: 00000000000e4049 RBX: ffff888076f83b80 RCX: ffffffff8164fb44
RDX: 0000000000000008 RSI: ffff888076f84660 RDI: ffff888076f83b80
RBP: 0000000000000008 R08: dffffc0000000000 R09: 1ffffffff215e649
R10: dffffc0000000000 R11: fffffbfff215e64a R12: ffff888076f83b80
R13: 0000000000000008 R14: ffff888076f84660 R15: ffff888076f84680
FS: 00007f86431f86c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f86431d6ff8 CR3: 000000004cc68000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
mark_usage kernel/locking/lockdep.c:4549 [inline]
__lock_acquire+0xd7e/0x7d10 kernel/locking/lockdep.c:5003
lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662
seqcount_lockdep_reader_access+0xcd/0x1d0 include/linux/seqlock.h:102
ktime_get+0x31/0x270 kernel/time/timekeeping.c:846
clockevents_program_event+0xe2/0x310 kernel/time/clockevents.c:326
hrtimer_interrupt+0x59d/0x9c0 kernel/time/hrtimer.c:1886
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: 00 00 00 66 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 ae 54 2e f7 48 89 df e8 f6 1c 2f f7 e8 71 6d 52 f7 fb bf 01 00 00 00 96 7d 22 f7 65 8b 05 57 01 cc 75 85 c0 74 02 5b c3 e8 a4 15 ca
RSP: 0018:ffffc9000c9bfb98 EFLAGS: 00000282
RAX: e53753d1bb972a00 RBX: ffff8880548cae40 RCX: e53753d1bb972a00
RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: 0000000000000001
RBP: ffff8880548cb2d8 R08: ffff8880548cae43 R09: 1ffff1100a9195c8
R10: dffffc0000000000 R11: ffffed100a9195c9 R12: 1ffff1100a91965b
R13: 0000000000000021 R14: dffffc0000000000 R15: 0000000000000000
spin_unlock_irq include/linux/spinlock.h:401 [inline]
get_signal+0x1163/0x1350 kernel/signal.c:2874
arch_do_signal_or_restart+0xc4/0x1350 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f864239acb7
Code: 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89
RSP: 002b:00007f86431f8028 EFLAGS: 00000246
RAX: 0000000000000048 RBX: 00007f8642615fa0 RCX: 00007f864239acb9
RDX: 0000200000000140 RSI: 0000000000000007 RDI: 0000000000000004
RBP: 00007f8642408bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8642616038 R14: 00007f8642615fa0 R15: 00007fff27fc9098