rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P19087/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=124125, q=358 ncpus=2)
task:syz.8.3397 state:R running task stack:29016 pid:19087 tgid:19086 ppid:16707 task_flags:0x400040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x10e9/0x6820 kernel/sched/core.c:7188
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7512
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:476 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
irqentry_exit+0x1fe/0x790 kernel/entry/common.c:164
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__sanitizer_cov_trace_pc+0x54/0x70 kernel/kcov.c:222
Code: c3 cc cc cc cc 8b 82 cc 16 00 00 85 c0 74 f1 8b 82 a8 16 00 00 83 f8 02 75 e6 48 8b 8a b0 16 00 00 8b 92 ac 16 00 00 48 8b 01 <48> 83 c0 01 48 39 d0 73 cd 48 89 01 48 89 34 c1 c3 cc cc cc cc 0f
RSP: 0018:ffffc900033e7880 EFLAGS: 00000246
RAX: 0000000000002227 RBX: ffff888056667930 RCX: ffffc90006361000
RDX: 0000000000080000 RSI: ffffffff84b2617d RDI: ffff888056667930
RBP: ffffc900033e79b8 R08: 0000000000000004 R09: 0000000000000600
R10: 000000000000002b R11: 0000000000000000 R12: ffff88802ade0de8
R13: 0000000000000600 R14: ffffc900033e7c80 R15: dffffc0000000000
avtab_search_node+0x1d/0x490 security/selinux/ss/avtab.c:151
context_struct_compute_av+0x622/0x1250 security/selinux/ss/services.c:664
security_compute_av+0x5ea/0x11e0 security/selinux/ss/services.c:1177
avc_compute_av+0x84/0x820 security/selinux/avc.c:992
avc_perm_nonode+0xb1/0x180 security/selinux/avc.c:1117
avc_has_perm_noaudit+0x2d4/0x3b0 security/selinux/avc.c:1160
avc_has_perm+0xbd/0x1e0 security/selinux/avc.c:1195
selinux_socket_create+0x215/0x590 security/selinux/hooks.c:4952
security_socket_create+0xa3/0x250 security/security.c:4192
__sock_create+0x8f/0x860 net/socket.c:1619
sock_create net/socket.c:1722 [inline]
__sys_socket_create net/socket.c:1759 [inline]
__sys_socket+0x14d/0x260 net/socket.c:1806
__do_sys_socket net/socket.c:1820 [inline]
__se_sys_socket net/socket.c:1818 [inline]
__x64_sys_socket+0x72/0xb0 net/socket.c:1818
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcdcd59c819
RSP: 002b:00007fcdce3b4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007fcdcd815fa0 RCX: 00007fcdcd59c819
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000018
RBP: 00007fcdcd632c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcdcd816038 R14: 00007fcdcd815fa0 R15: 00007fff687b1918
rcu: rcu_preempt kthread starved for 10501 jiffies! g124125 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:27752 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x10e9/0x6820 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7282
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 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: 0 UID: 0 PID: 19085 Comm: syz.1.3398 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:185 [inline]
RIP: 0010:write_comp_data+0x3a/0x90 kernel/kcov.c:246
Code: 65 48 8b 3d 90 1d 0a 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00 00 ff 00 74 05 e9 40 f8 92 09 8b 87 cc 16 00 00 85 c0 74 f1 <8b> 87 a8 16 00 00 83 f8 03 75 e6 48 8b 87 b0 16 00 00 8b bf ac 16
RSP: 0000:ffffc900033c7880 EFLAGS: 00000246
RAX: 0000000000000003 RBX: 0000000000000001 RCX: ffffffff81fcf98d
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff888078114a00
RBP: ffff8880b8540f40 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003
R13: ffffed10170a81e9 R14: 0000000000000001 R15: ffff8880b843c5c0
FS: 00005555910f4500(0000) GS:ffff8881242e7000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3e18012000 CR3: 000000003643d000 CR4: 00000000003526f0
Call Trace:
csd_lock_wait kernel/smp.c:342 [inline]
smp_call_function_many_cond+0x5ad/0x1700 kernel/smp.c:892
on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1057
__flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline]
flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
flush_tlb_mm_range+0x45f/0x16f0 arch/x86/mm/tlb.c:1451
flush_tlb_page arch/x86/include/asm/tlbflush.h:345 [inline]
ptep_clear_flush+0x148/0x170 mm/pgtable-generic.c:104
wp_page_copy mm/memory.c:3925 [inline]
do_wp_page+0x12a4/0x4350 mm/memory.c:4320
handle_pte_fault mm/memory.c:6427 [inline]
__handle_mm_fault+0x1ab6/0x2a00 mm/memory.c:6549
handle_mm_fault+0x36d/0xa20 mm/memory.c:6718
do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1334
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f3e17c64f83
Code: 53 48 83 ec 38 80 3d 9b d0 3a 00 00 89 7c 24 18 48 89 74 24 28 0f 85 cd 09 00 00 80 3d 6a 07 ee 00 00 49 89 f1 41 89 d2 89 cb 05 76 d0 3a 00 01 41 89 d7 0f 85 45 04 00 00 80 3d 36 07 ee 00
RSP: 002b:00007ffe2920fdb0 EFLAGS: 00010202
RAX: 00007f3e18015fa0 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 00007f3e18016038 RDI: 0000000000000000
RBP: 00007f3e18015fb0 R08: 0000000000000000 R09: 00007f3e18016038
R10: 0000000000000003 R11: 0000000000000000 R12: 00007f3e18015fa0
R13: 0000200000000000 R14: 00007ffe2920fe28 R15: 00007f3e18015fa0