rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P9131/1:b..l..
rcu: (detected by 1, t=10502 jiffies, g=28373, q=903534 ncpus=2)
task:syz.0.833 state:R running task stack:27400 pid:9131 tgid:9126 ppid:5633 task_flags:0x400040 flags:0x00080002
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:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5947
Code: ff ff ff e8 30 4e 61 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 32 48 3d 13 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 4f 61 64 0a cc 48 8d 3d 07 1d 1d
RSP: 0018:ffffc9000b2df1e0 EFLAGS: 00000292
RAX: c1ecca47d4ed6000 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 000000004b016c3e RSI: ffffffff8e9347bc RDI: ffffffff8c8ea180
RBP: ffff88802c170000 R08: ffffffff817879cf R09: 0000000000000000
R10: ffffc9000b2df318 R11: ffffffff81b3a390 R12: ffffffff9015a2a0
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495
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
lsm_inode_alloc security/security.c:255 [inline]
security_inode_alloc+0x39/0x310 security/security.c:1229
inode_init_always_gfp+0x97e/0xd30 fs/inode.c:298
inode_init_always include/linux/fs.h:2974 [inline]
alloc_inode+0x82/0x1b0 fs/inode.c:345
new_inode+0x1f/0x170 fs/inode.c:1181
proc_pid_make_inode+0x21/0x130 fs/proc/base.c:1933
proc_pident_instantiate+0x6d/0x2a0 fs/proc/base.c:2674
proc_pident_lookup+0x1b7/0x270 fs/proc/base.c:2709
__lookup_slow+0x1fb/0x2f0 fs/namei.c:1925
lookup_slow+0x59/0x80 fs/namei.c:1942
walk_component fs/namei.c:2288 [inline]
link_path_walk+0xd83/0x19a0 fs/namei.c:2662
path_openat+0x1b7/0x20f0 fs/namei.c:5012
do_file_open+0x23e/0x4a0 fs/namei.c:5045
do_sys_openat2+0x115/0x200 fs/open.c:1442
do_sys_open fs/open.c:1448 [inline]
__do_sys_openat fs/open.c:1464 [inline]
__se_sys_openat fs/open.c:1459 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1459
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: 0033:0x7fceea96034e
RSP: 002b:00007fceeb7f0f18 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fceeb7f16c0 RCX: 00007fceea96034e
RDX: 0000000000000000 RSI: 00007fceeaa3729e RDI: ffffffffffffff9c
RBP: 00007fceeaa37b70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fceeac263f8 R14: 00007fceeac26360 R15: 00007ffc41745c58
rcu: rcu_preempt kthread starved for 1470 jiffies! g28373 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:
CPU: 1 UID: 0 PID: 5619 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
RIP: 0010:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5947
Code: ff ff ff e8 30 4e 61 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 32 48 3d 13 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 4f 61 64 0a cc 48 8d 3d 07 1d 1d
RSP: 0018:ffffc90000a07ea0 EFLAGS: 00000296
RAX: 12463cebac44fe00 RBX: 0000000000000000 RCX: 8000000000000100
RDX: 00000000071bee9f RSI: ffffffff8e9347bc RDI: ffffffff8c8ea180
RBP: ffff88803644be80 R08: ffffffff817879cf R09: 0000000000000000
R10: ffffc90000a07fd8 R11: ffffffff81b3a390 R12: ffffffff9015a2a0
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246
FS: 0000555587395540(0000) GS:ffff88812350a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdbf5d3e10 CR3: 0000000074998000 CR4: 00000000003526f0
Call Trace:
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
__call_rcu_common kernel/rcu/tree.c:3287 [inline]
call_rcu+0x86/0x300 kernel/rcu/tree.c:3395
refdst_drop include/net/dst.h:272 [inline]
skb_dst_drop include/net/dst.h:284 [inline]
skb_release_head_state+0x71/0x370 net/core/skbuff.c:1162
skb_release_all net/core/skbuff.c:1186 [inline]
__kfree_skb+0x24/0x210 net/core/skbuff.c:1202
nft_synproxy_eval_v4+0x36a/0x4e0 net/netfilter/nft_synproxy.c:-1
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_ipv4+0x195/0x290 net/netfilter/nft_chain_filter.c:24
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:6435 [inline]
__netif_receive_skb net/core/dev.c:6548 [inline]
process_backlog+0xa6b/0x18b0 net/core/dev.c:6899
__napi_poll+0xaa/0x330 net/core/dev.c:7985
napi_poll net/core/dev.c:8048 [inline]
net_rx_action+0x61d/0xf50 net/core/dev.c:8205
handle_softirqs+0x265/0x8d0 kernel/softirq.c:669
__do_softirq kernel/softirq.c:703 [inline]
invoke_softirq kernel/softirq.c:542 [inline]
__irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786
irq_exit_rcu+0x9/0x30 kernel/softirq.c:809
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5947
Code: ff ff ff e8 30 4e 61 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 32 48 3d 13 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 4f 61 64 0a cc 48 8d 3d 07 1d 1d
RSP: 0018:ffffc90003bdf5c8 EFLAGS: 00000282
RAX: 12463cebac44fe00 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 00000000704ab5bb RSI: ffffffff8e9347bc RDI: ffffffff8c8ea180
RBP: ffff88803644be80 R08: ffffffff817879cf R09: 0000000000000000
R10: ffffc90003bdf708 R11: fffff5200077beed R12: ffffffff9015a2a0
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495
__unwind_start+0x514/0x660 arch/x86/kernel/unwind_orc.c:787
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24
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
lsm_file_alloc security/security.c:172 [inline]
security_file_alloc+0x34/0x310 security/security.c:2428
init_file+0x90/0x2b0 fs/file_table.c:184
alloc_empty_file+0x74/0x1d0 fs/file_table.c:266
alloc_file fs/file_table.c:396 [inline]
alloc_file_pseudo+0x110/0x1e0 fs/file_table.c:427
create_pipe_files+0x306/0x7a0 fs/pipe.c:1027
__do_pipe_flags+0x46/0x1f0 fs/pipe.c:1073
do_pipe2+0xaa/0x190 fs/pipe.c:1121
__do_sys_pipe2 fs/pipe.c:1139 [inline]
__se_sys_pipe2 fs/pipe.c:1137 [inline]
__x64_sys_pipe2+0x5a/0x70 fs/pipe.c:1137
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: 0033:0x7f760359eb49
Code: 38 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 eb aa e8 ea 34 00 00 66 2e 0f 1f 84 00 00 00 00 00 31 f6 b8 25 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 07 c3 66 0f 1f 44 00 00 48 c7 c2 e8 ff ff ff
RSP: 002b:00007ffe17f9d258 EFLAGS: 00000246 ORIG_RAX: 0000000000000125
RAX: ffffffffffffffda RBX: 00005555873a9eb0 RCX: 00007f760359eb49
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 00007ffe17f9d270
RBP: 00007ffe17f9d840 R08: 0000000000000650 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe17f9d3a0
R13: 00005555873a8930 R14: 00005555873ae450 R15: 00007ffe17f9d3c0