rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (1 GPs behind) idle=5844/1/0x4000000000000002 softirq=65781/65792 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P18512/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=50713, q=392 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.17.0-rc1-syzkaller-00016-g8742b2d8935f #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__rb_insert lib/rbtree.c:110 [inline]
RIP: 0010:rb_insert_color+0x30/0x810 lib/rbtree.c:436
Code: 00 00 00 00 00 fc ff df 41 57 48 89 fa 41 56 48 c1 ea 03 41 55 41 54 49 89 fc 55 53 48 83 ec 08 80 3c 02 00 0f 85 af 05 00 00 <49> be 00 00 00 00 00 fc ff df 49 8b 1c 24 48 85 db 0f 84 15 05 00
RSP: 0018:ffffc90000007dc0 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8b8f6998
RDX: 1ffff110053f7668 RSI: ffff8880b8427dd0 RDI: ffff888029fbb340
RBP: ffff888029fbb340 R08: 0000000000000006 R09: ffff888029fbb340
R10: ffff888029fbb340 R11: ffffffff9b0a6868 R12: ffff888029fbb340
R13: 0000000000000000 R14: ffff888029fbb340 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8881246bc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c379535 CR3: 000000001d7b4000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000097 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
rb_insert_color_cached include/linux/rbtree.h:114 [inline]
rb_add_cached include/linux/rbtree.h:183 [inline]
timerqueue_add+0x28c/0x330 lib/timerqueue.c:40
__run_hrtimer kernel/time/hrtimer.c:1778 [inline]
__hrtimer_run_queues+0x8ff/0xad0 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x3f0 arch/x86/kernel/apic/apic.c:1056
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:steal_cookie_task kernel/sched/core.c:6366 [inline]
RIP: 0010:sched_core_balance+0x404/0xeb0 kernel/sched/core.c:6386
Code: 00 4c 89 f0 85 d2 0f 85 3c 01 00 00 4c 39 e8 74 08 4c 89 f7 e8 1d 6f fe ff 48 89 ef e8 15 6f fe ff e8 30 e7 38 00 fb 45 84 e4 <0f> 85 9c 00 00 00 8d 4b 01 48 63 d1 48 39 14 24 73 4c 83 f9 08 74
RSP: 0018:ffffffff8e207b68 EFLAGS: 00000246
RAX: 0000000002a66f6f RBX: 0000000000000001 RCX: ffffffff81c378cf
RDX: 0000000000000000 RSI: ffffffff8de4f205 RDI: ffffffff8c162580
RBP: ffff8880b843a300 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90ab3697 R11: ffff8880b843b158 R12: 0000000000000000
R13: ffff8880b843a300 R14: ffff8880b853a300 R15: dffffc0000000000
do_balance_callbacks kernel/sched/core.c:5011 [inline]
__balance_callbacks kernel/sched/core.c:5065 [inline]
__schedule+0x3fdf/0x5de0 kernel/sched/core.c:6968
schedule_idle+0x5c/0x90 kernel/sched/core.c:7084
do_idle+0x2b6/0x510 kernel/sched/idle.c:358
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:428
rest_init+0x16b/0x2b0 init/main.c:744
start_kernel+0x3ee/0x4d0 init/main.c:1097
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:307
x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:288
common_startup_64+0x13e/0x148
task:syz-executor state:R running task stack:27848 pid:18512 tgid:18512 ppid:15664 task_flags:0x400040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7288
irqentry_exit+0x36/0x90 kernel/entry/common.c:197
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:bpf_tree_comp kernel/bpf/core.c:646 [inline]
RIP: 0010:__lt_find include/linux/rbtree_latch.h:115 [inline]
RIP: 0010:latch_tree_find include/linux/rbtree_latch.h:210 [inline]
RIP: 0010:bpf_ksym_find+0xa0/0x1c0 kernel/bpf/core.c:744
Code: de e8 24 97 f0 ff 4a 8d 2c 33 48 8d bd e0 fd ff ff 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 f1 00 00 00 4c 8b bd e0 fd ff ff <4c> 89 e7 4c 89 fe e8 a5 91 f0 ff 4d 39 fc 0f 82 b9 00 00 00 e8 e7
RSP: 0018:ffffc9000fed77a0 EFLAGS: 00000246
RAX: 1ffffffff2070e87 RBX: ffffffff90387658 RCX: ffffffff81cca732
RDX: ffff88807a4d0000 RSI: ffffffff81cafbfc RDI: ffffffff90387438
RBP: ffffffff90387658 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 00007f865cd8e167
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffffffa0205480
is_bpf_text_address+0x58/0x1a0 kernel/bpf/core.c:777
kernel_text_address kernel/extable.c:125 [inline]
kernel_text_address+0x8d/0x100 kernel/extable.c:94
__kernel_text_address+0xd/0x40 kernel/extable.c:79
unwind_get_return_address+0x59/0xa0 arch/x86/kernel/unwind_orc.c:369
arch_stack_walk+0xa6/0x100 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:405
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4365 [inline]
__kmalloc_noprof+0x223/0x510 mm/slub.c:4377
kmalloc_noprof include/linux/slab.h:909 [inline]
shmem_initxattrs+0x168/0x5b0 mm/shmem.c:4330
security_inode_init_security+0x26b/0x390 security/security.c:1852
shmem_symlink+0x135/0x9f0 mm/shmem.c:4163
vfs_symlink fs/namei.c:4730 [inline]
vfs_symlink+0x400/0x680 fs/namei.c:4714
do_symlinkat+0x261/0x310 fs/namei.c:4756
__do_sys_symlinkat fs/namei.c:4772 [inline]
__se_sys_symlinkat fs/namei.c:4769 [inline]
__x64_sys_symlinkat+0x93/0xc0 fs/namei.c:4769
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f865cd8e167
RSP: 002b:00007fff6f229a48 EFLAGS: 00000202 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f865cd8e167
RDX: 00007f865ce136b9 RSI: 00000000ffffff9c RDI: 00007f865ce12218
RBP: 00007fff6f229a8c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000001d
R13: 00000000000927c0 R14: 000000000009aa12 R15: 00007fff6f229ae0
rcu: rcu_preempt kthread starved for 10502 jiffies! g50713 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:28352 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7058
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2285
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
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: 15669 Comm: syz-executor Not tainted 6.17.0-rc1-syzkaller-00016-g8742b2d8935f #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:185 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x3b/0x70 kernel/kcov.c:217
Code: 8b 05 f9 ac 1a 12 a9 00 01 ff 00 74 1d f6 c4 01 74 43 a9 00 00 0f 00 75 3c a9 00 00 f0 00 75 35 8b 82 3c 16 00 00 85 c0 74 2b <8b> 82 18 16 00 00 83 f8 02 75 20 48 8b 8a 20 16 00 00 8b 92 1c 16
RSP: 0018:ffffc9000496f730 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffff8880b8442000 RCX: ffffffff81af8e41
RDX: ffff88807a44a440 RSI: ffffffff81af8e1b RDI: 0000000000000005
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffed1017088401 R14: 0000000000000001 R15: 0000000000000000
FS: 00005555689b1500(0000) GS:ffff8881247bc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f865cd185b0 CR3: 00000000694cc000 CR4: 00000000003526f0
Call Trace:
native_pause arch/x86/include/asm/vdso/processor.h:13 [inline]
cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline]
csd_lock_wait kernel/smp.c:342 [inline]
smp_call_function_many_cond+0xdfb/0x1600 kernel/smp.c:877
on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1044
__flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
flush_tlb_mm_range+0x4a0/0x17a0 arch/x86/mm/tlb.c:1451
dup_mmap+0xfa2/0x21d0 mm/mmap.c:1873
dup_mm kernel/fork.c:1485 [inline]
copy_mm kernel/fork.c:1537 [inline]
copy_process+0x4081/0x7690 kernel/fork.c:2175
kernel_clone+0xfc/0x930 kernel/fork.c:2605
__do_sys_clone+0xce/0x120 kernel/fork.c:2748
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff9ef985453
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffd8e4cbd08 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff9ef985453
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 00005555689b17d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 000000000009b125 R15: 00007ffd8e4cbea0