rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P18914/1:b..l.. P18911/1:b..l.. P15234/1:b..l..
rcu: (detected by 0, t=10502 jiffies, g=85189, q=863986 ncpus=2)
task:syz-executor state:R running task stack:24040 pid:15234 tgid:15234 ppid:5624 task_flags:0x40050c flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
preempt_schedule_common+0x7f/0xd0 kernel/sched/core.c:7561
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:201 [inline]
_raw_spin_unlock+0x41/0x50 kernel/locking/spinlock.c:213
spin_unlock include/linux/spinlock.h:401 [inline]
zap_pte_range mm/memory.c:2059 [inline]
zap_pmd_range mm/memory.c:2117 [inline]
zap_pud_range mm/memory.c:2145 [inline]
zap_p4d_range mm/memory.c:2166 [inline]
__zap_vma_range+0x3d52/0x4b80 mm/memory.c:2206
unmap_vmas+0x38b/0x550 mm/memory.c:2275
exit_mmap+0x290/0xa40 mm/mmap.c:1315
__mmput+0x118/0x420 kernel/fork.c:1192
exit_mm+0x18e/0x240 kernel/exit.c:586
do_exit+0x6a8/0x2360 kernel/exit.c:967
do_group_exit+0x22d/0x2f0 kernel/exit.c:1123
get_signal+0x136a/0x1430 kernel/signal.c:3113
arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7faa164657
RSP: 002b:00007ffcc028b340 EFLAGS: 00000202 ORIG_RAX: 000000000000003d
RAX: fffffffffffffe00 RBX: 0000555569f5a500 RCX: 00007f7faa164657
RDX: 0000000040000000 RSI: 00007ffcc028b39c RDI: ffffffffffffffff
RBP: 00007ffcc028b39c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffcc028b5f8 R15: 0000000000000000
task:syz.2.3907 state:R running task stack:26920 pid:18911 tgid:18907 ppid:15241 task_flags:0x40054c flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
preempt_schedule_common+0x7f/0xd0 kernel/sched/core.c:7561
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:201 [inline]
_raw_spin_unlock+0x41/0x50 kernel/locking/spinlock.c:213
spin_unlock include/linux/spinlock.h:401 [inline]
zap_pte_range mm/memory.c:2059 [inline]
zap_pmd_range mm/memory.c:2117 [inline]
zap_pud_range mm/memory.c:2145 [inline]
zap_p4d_range mm/memory.c:2166 [inline]
__zap_vma_range+0x3d52/0x4b80 mm/memory.c:2206
unmap_vmas+0x38b/0x550 mm/memory.c:2275
exit_mmap+0x290/0xa40 mm/mmap.c:1315
__mmput+0x118/0x420 kernel/fork.c:1192
exit_mm+0x18e/0x240 kernel/exit.c:586
do_exit+0x6a8/0x2360 kernel/exit.c:967
do_group_exit+0x22d/0x2f0 kernel/exit.c:1123
get_signal+0x136a/0x1430 kernel/signal.c:3113
arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7faa1a94d9
RSP: 002b:00007f7fab128028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: 0000000000000001 RBX: 00007f7faa426090 RCX: 00007f7faa1a94d9
RDX: 0000000000000007 RSI: 0000200000001b40 RDI: 0000000000000004
RBP: 00007f7faa23804e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7faa426128 R14: 00007f7faa426090 R15: 00007ffcc028ae58
task:modprobe state:R running task stack:23528 pid:18914 tgid:18914 ppid:1454 task_flags:0x400000 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7662
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:543 [inline]
irqentry_exit+0x14f/0x9b0 kernel/entry/common.c:154
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:229 [inline]
RIP: 0010:unwind_next_frame+0x225/0x2550 arch/x86/kernel/unwind_orc.c:510
Code: 0f 85 66 1d 00 00 45 8b 6d 00 44 89 f8 ff c0 4c 8d 24 85 fc 38 09 93 4c 89 e0 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 66 1d 00 00 <45> 8b 04 24 41 ff c0 4a 8d 04 6d 00 00 00 00 4c 01 e8 48 8d 34 45
RSP: 0018:ffffc90005796a40 EFLAGS: 00000246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 8000000000000000
RDX: 00000000000b09cc RSI: ffffffff8c8ea160 RDI: ffffffff8c8ea120
RBP: ffffffff8240ad58 R08: ffffffff817879cf R09: 0000000000000000
R10: ffffc90005796b38 R11: ffffffff81b3a390 R12: ffffffff930e3bb4
R13: 000000000003fcd0 R14: ffffc90005796ae8 R15: 00000000000140ad
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
save_stack+0x122/0x230 mm/page_owner.c:183
__reset_page_owner+0x73/0x2a0 mm/page_owner.c:338
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1403 [inline]
__free_frozen_pages+0xc97/0xd90 mm/page_alloc.c:2957
__slab_free+0x269/0x2c0 mm/slub.c:5926
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:361
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4720 [inline]
slab_alloc_node mm/slub.c:5033 [inline]
kmem_cache_alloc_noprof+0x2b4/0x600 mm/slub.c:5047
mt_alloc_one lib/maple_tree.c:139 [inline]
mas_alloc_nodes+0x291/0x350 lib/maple_tree.c:1049
mas_preallocate+0x42a/0x840 lib/maple_tree.c:5016
vma_iter_prealloc mm/vma.h:698 [inline]
__split_vma+0x414/0x8a0 mm/vma.c:562
vms_gather_munmap_vmas+0x4e3/0x1370 mm/vma.c:1545
__mmap_setup mm/vma.c:2591 [inline]
__mmap_region mm/vma.c:3071 [inline]
mmap_region+0x90d/0x2800 mm/vma.c:3173
do_mmap+0xe0a/0x1300 mm/mmap.c:573
vm_mmap_pgoff+0x27a/0x520 mm/util.c:581
ksys_mmap_pgoff+0x4dc/0x760 mm/mmap.c:619
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8bb315b242
RSP: 002b:00007ffed7f59c98 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f8bb2e00000 RCX: 00007f8bb315b242
RDX: 0000000000000001 RSI: 0000000000026000 RDI: 00007f8bb2e00000
RBP: 0000000000000812 R08: 0000000000000000 R09: 000000000003a000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffed7f59d20
R13: 00007f8bb2e326b0 R14: 00007ffed7f5a0d0 R15: 00000fffdafeb396
rcu: rcu_preempt kthread starved for 4634 jiffies! g85189 f0x2 RCU_GP_WAIT_FQS(5) ->state=R ->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:27496 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x1230 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9c/0x340 kernel/rcu/tree.c:2330
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 3235 Comm: kworker/R-bat_e Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Workqueue: bat_events batadv_tt_purge
RIP: 0010:lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline]
RIP: 0010:lock_is_held_type+0xec/0x150 kernel/locking/lockdep.c:6017
Code: 0f 95 c0 31 db 39 c5 0f 94 c3 eb 05 bb 01 00 00 00 48 c7 c7 c5 4c 93 8e e8 01 1c 00 00 b8 ff ff ff ff 65 0f c1 05 8c ee db 08 <83> f8 01 75 25 9c 58 a9 00 02 00 00 75 39 41 f7 c4 00 02 00 00 74
RSP: 0018:ffffc90000a07b30 EFLAGS: 00000057
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 8000000000000101
RDX: 8000000000000100 RSI: ffffffff8e934cc5 RDI: ffffffff8c8ea180
RBP: 00000000ffffffff R08: 0000000000000100 R09: 0000000000000000
R10: 0000000000000008 R11: 8000000000000100 R12: 0000000000000246
R13: ffff8880339c3e80 R14: ffffffff916934a0 R15: 0000000000000007
FS: 0000000000000000(0000) GS:ffff888123509000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000c23030 CR3: 000000000ff48000 CR4: 00000000003526f0
Call Trace:
lock_is_held include/linux/lockdep.h:249 [inline]
lockdep_rtnl_is_held+0x1b/0x40 net/core/rtnetlink.c:182
fib_table_lookup+0xdd/0x17d0 net/ipv4/fib_trie.c:1434
fib4_rule_action+0x1fb/0x330 net/ipv4/fib_rules.c:139
fib_rules_lookup+0x8aa/0xeb0 net/core/fib_rules.c:339
__fib_lookup+0x106/0x210 net/ipv4/fib_rules.c:96
ip_route_output_key_hash_rcu+0x294/0x2720 net/ipv4/route.c:2855
ip_route_output_key_hash+0x18d/0x2a0 net/ipv4/route.c:2746
__ip_route_output_key include/net/route.h:175 [inline]
ip_route_output_flow+0x2a/0x150 net/ipv4/route.c:2973
ip_route_output_key include/net/route.h:185 [inline]
ip_route_me_harder+0x762/0xfe0 net/ipv4/netfilter.c:54
synproxy_send_tcp+0x332/0x670 net/netfilter/nf_synproxy_core.c:434
synproxy_send_client_synack+0x89b/0xde0 net/netfilter/nf_synproxy_core.c:487
nft_synproxy_eval_v4+0x362/0x4e0 net/netfilter/nft_synproxy.c:59
nft_synproxy_do_eval+0x389/0x5d0 net/netfilter/nft_synproxy.c:142
expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]
nft_do_chain+0x48d/0x1b10 net/netfilter/nf_tables_core.c:285
nft_do_chain_inet+0x360/0x4b0 net/netfilter/nft_chain_filter.c:162
nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:633
nf_hook include/linux/netfilter.h:280 [inline]
NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:323
NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:325
__netif_receive_skb_one_core net/core/dev.c:6467 [inline]
__netif_receive_skb net/core/dev.c:6580 [inline]
process_backlog+0xa6b/0x18b0 net/core/dev.c:6931
__napi_poll+0xaa/0x330 net/core/dev.c:8017
napi_poll net/core/dev.c:8080 [inline]
net_rx_action+0x61d/0xf50 net/core/dev.c:8237
handle_softirqs+0x265/0x8d0 kernel/softirq.c:669
do_softirq+0x77/0xd0 kernel/softirq.c:569
__local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
spin_unlock_bh include/linux/spinlock.h:407 [inline]
batadv_tt_global_purge net/batman-adv/translation-table.c:2935 [inline]
batadv_tt_purge+0x4ee/0xa40 net/batman-adv/translation-table.c:4339
process_one_work kernel/workqueue.c:3495 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
rescuer_thread+0x84a/0x12a0 kernel/workqueue.c:3803
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245