rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P10100/1:b..l
(detected by 0, t=10502 jiffies, g=38485, q=644 ncpus=2)
task:syz.2.1763 state:R running task stack:21744 pid:10100 ppid:4278 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:should_resched arch/x86/include/asm/preempt.h:103 [inline]
RIP: 0010:__local_bh_enable_ip+0x13e/0x1c0 kernel/softirq.c:428
Code: 8a e8 26 95 de 08 65 66 8b 05 0e 3a b4 7e 66 85 c0 75 54 bf 01 00 00 00 e8 6f 85 09 00 e8 da 77 39 00 fb 65 8b 05 ba 08 b3 7e <85> c0 75 05 e8 09 1d b1 ff 48 c7 04 24 0e 36 e0 45 4b c7 04 37 00
RSP: 0018:ffffc9000cd2f4a0 EFLAGS: 00000286
RAX: 0000000000000000 RBX: 0000000000000200 RCX: 55fb85e6acf9a900
RDX: dffffc0000000000 RSI: ffffffff8a8c1120 RDI: ffffffff8adf1320
RBP: ffffc9000cd2f530 R08: ffff8880b8f3580b R09: 1ffff110171e6b01
R10: dffffc0000000000 R11: ffffed10171e6b02 R12: ffffffff88319a0b
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920019a5e94
local_bh_enable include/linux/bottom_half.h:33 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:861 [inline]
__dev_queue_xmit+0x1cd2/0x37c0 net/core/dev.c:4411
dev_queue_xmit include/linux/netdevice.h:3051 [inline]
__bpf_tx_skb net/core/filter.c:2134 [inline]
__bpf_redirect_common net/core/filter.c:2182 [inline]
__bpf_redirect+0xbdf/0x1180 net/core/filter.c:2189
____bpf_clone_redirect net/core/filter.c:2473 [inline]
bpf_clone_redirect+0x30b/0x4a0 net/core/filter.c:2436
bpf_prog_c6f54bbad6dab1ee+0x56/0x5b
bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline]
__bpf_prog_run include/linux/filter.h:596 [inline]
bpf_prog_run include/linux/filter.h:614 [inline]
bpf_test_run+0x4c1/0x830 net/bpf/test_run.c:402
bpf_prog_test_run_skb+0xaa6/0x12a0 net/bpf/test_run.c:1191
bpf_prog_test_run+0x31e/0x390 kernel/bpf/syscall.c:3695
__sys_bpf+0x62b/0x780 kernel/bpf/syscall.c:5049
__do_sys_bpf kernel/bpf/syscall.c:5135 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5133 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5133
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: 0033:0x7f3b5a99cdd9
RSP: 002b:00007f3b5b85d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f3b5ac15fa0 RCX: 00007f3b5a99cdd9
RDX: 0000000000000050 RSI: 0000200000000100 RDI: 000000000000000a
RBP: 00007f3b5aa32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3b5ac16038 R14: 00007f3b5ac15fa0 R15: 00007ffc5df6ffa8
rcu: rcu_preempt kthread timer wakeup didn't happen for 10458 jiffies! g38485 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=20713
rcu: rcu_preempt kthread starved for 10459 jiffies! g38485 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: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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 10106 Comm: syz.2.1763 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:idle_cpu+0x2/0x110 kernel/sched/core.c:7193
Code: 9e 8c e8 51 0a e0 02 e9 63 fc ff ff 44 89 ff 31 f6 e8 b2 d8 09 00 84 c0 b8 ff ff ff ff 0f 85 fc fa ff ff e9 b9 fb ff ff 41 57 <41> 56 41 54 53 48 63 df 83 fb 08 0f 83 b8 00 00 00 49 bf 00 00 00
RSP: 0018:ffffc900001e0c90 EFLAGS: 00000086
RAX: 0000000000000001 RBX: ffff88802eb99dc0 RCX: f393a995b72fc700
RDX: 1ffffffff1f41c08 RSI: ffffffff8adf1300 RDI: 0000000000000001
RBP: ffffc900001e0d28 R08: ffffffff8fa0e048 R09: ffffffff8fa0e058
R10: ffffffff8fa0e050 R11: ffffffff8fa0e043 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffff9200003c194
FS: 00007f3b5b81b6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f02ee967f10 CR3: 0000000079724000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
tick_irq_exit kernel/softirq.c:662 [inline]
__irq_exit_rcu+0x147/0x230 kernel/softirq.c:681
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
sysvec_irq_work+0x4f/0xc0 arch/x86/kernel/irq_work.c:17
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:variable_ffs arch/x86/include/asm/bitops.h:319 [inline]
RIP: 0010:handle_softirqs+0x1c8/0x930 kernel/softirq.c:584
Code: 89 7c 24 44 0f b7 db 48 c7 c7 00 07 8b 8a e8 bf 90 de 08 65 66 c7 05 a5 35 b4 7e 00 00 e8 80 73 39 00 fb 49 c7 c6 c0 a0 80 8c <89> 5c 24 4c b8 ff ff ff ff 0f bc 44 24 4c 41 89 c5 41 ff c5 0f 84
RSP: 0018:ffffc900001e0e00 EFLAGS: 00000286
RAX: f393a995b72fc700 RBX: 0000000000000200 RCX: f393a995b72fc700
RDX: dffffc0000000000 RSI: ffffffff8a8c1120 RDI: ffffffff8adf1320
RBP: ffffc900001e0f30 R08: ffff8880b8f3580b R09: 1ffff110171e6b01
R10: dffffc0000000000 R11: ffffed10171e6b02 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffffff8c80a0c0 R15: 000000000000000a
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:rcu_read_unlock_special+0x0/0x510 kernel/rcu/tree_plugin.h:630
Code: a6 46 66 00 eb b0 44 89 f1 80 e1 07 80 c1 03 38 c1 7c 94 49 89 fd 4c 89 f7 e8 8c 46 66 00 4c 89 ef eb 84 0f 1f 80 00 00 00 00 <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec c0 00
RSP: 0018:ffffc9000d247af8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff88802eb9a1fc RCX: 0000000000080000
RDX: ffffc90010811000 RSI: 000000000002c006 RDI: ffff88802eb99dc0
RBP: dffffc0000000000 R08: ffff88801c582d7f R09: 1ffff110038b05af
R10: dffffc0000000000 R11: ffffed10038b05b0 R12: 1ffff11005d7343f
R13: 0000000000000003 R14: ffff88802eb9a200 R15: dffffc0000000000
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
page_ext_put+0x91/0xb0 mm/page_ext.c:182
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1486 [inline]
free_pcp_prepare mm/page_alloc.c:1536 [inline]
free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3413
free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3508
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737
slab_alloc_node mm/slub.c:3359 [inline]
slab_alloc mm/slub.c:3367 [inline]
__kmem_cache_alloc_lru mm/slub.c:3374 [inline]
kmem_cache_alloc_lru+0x11a/0x2e0 mm/slub.c:3390
__d_alloc+0x31/0x700 fs/dcache.c:1774
d_alloc_pseudo+0x19/0x70 fs/dcache.c:1906
alloc_file_pseudo+0xe0/0x200 fs/file_table.c:265
sock_alloc_file+0xb3/0x240 net/socket.c:467
sock_map_fd net/socket.c:491 [inline]
__sys_socket+0x12a/0x190 net/socket.c:1678
__do_sys_socket net/socket.c:1683 [inline]
__se_sys_socket net/socket.c:1681 [inline]
__x64_sys_socket+0x76/0x80 net/socket.c:1681
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: 0033:0x7f3b5a99cdd9
Code: 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 01 48
RSP: 002b:00007f3b5b81b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007f3b5ac16180 RCX: 00007f3b5a99cdd9
RDX: 0000000000000002 RSI: 0000000000000003 RDI: 0000000000000002
RBP: 00007f3b5aa32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3b5ac16218 R14: 00007f3b5ac16180 R15: 00007ffc5df6ffa8