rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (0 ticks this GP) idle=5f7c/1/0x4000000000000000 softirq=79542/79542 fqs=3
rcu: (detected by 0, t=10502 jiffies, g=108233, q=278 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 17921 Comm: syz.2.3577 Not tainted 6.10.0-rc6-syzkaller-00067-g8a9c6c40432e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:rb_insert_color_cached include/linux/rbtree.h:113 [inline]
RIP: 0010:rb_add_cached include/linux/rbtree.h:183 [inline]
RIP: 0010:timerqueue_add+0x228/0x290 lib/timerqueue.c:40
Code: 7c f6 48 b8 00 00 00 00 00 fc ff df 80 3c 03 00 74 08 4c 89 e7 e8 e8 dd 7c f6 4d 89 3c 24 eb 0a e8 8d 27 17 f6 4c 8b 64 24 08 <49> 8d 5c 24 08 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df
RSP: 0018:ffffc90000a18cc0 EFLAGS: 00000046
RAX: ffffffff8b7effc3 RBX: ffff888059db0340 RCX: ffff8880294e3c00
RDX: 0000000000010001 RSI: 0000000000000000 RDI: ffff888059db0358
RBP: ffffffff947e29e0 R08: ffff888059db0357 R09: ffff888059db0348
R10: dffffc0000000000 R11: ffffed100b3b606b R12: ffff8880b952c9d0
R13: 1ffffffff28fc53e R14: 0000000000000010 R15: ffff888059db0340
FS: 00007f6612c106c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c25b566 CR3: 000000005a02a000 CR4: 0000000000350ef0
Call Trace:
enqueue_hrtimer+0x1b2/0x3c0 kernel/time/hrtimer.c:1093
__run_hrtimer kernel/time/hrtimer.c:1706 [inline]
__hrtimer_run_queues+0x6cb/0xd50 kernel/time/hrtimer.c:1753
hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1815
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
__sysvec_apic_timer_interrupt+0x112/0x3f0 arch/x86/kernel/apic/apic.c:1049
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:read_seqbegin+0x1d2/0x250 include/linux/seqlock.h:772
Code: 68 82 ff 4d 85 ed 75 16 e8 5b 68 82 ff eb 15 e8 54 68 82 ff e8 af 27 72 09 4d 85 ed 74 ea e8 45 68 82 ff fb 8b 1d 6e 87 ed 0b <89> de 83 e6 01 31 ff e8 72 6c 82 ff 89 d8 83 e0 01 75 07 e8 26 68
RSP: 0018:ffffc90004d87420 EFLAGS: 00000283
RAX: ffffffff8213bf0b RBX: 0000000000006086 RCX: 0000000000040000
RDX: ffffc9001362a000 RSI: 0000000000000903 RDI: 0000000000000904
RBP: ffffc90004d874d0 R08: ffffffff8213bee1 R09: 1ffffffff25f4ec3
R10: dffffc0000000000 R11: fffffbfff25f4ec4 R12: 1ffff920009b0e84
R13: 0000000000000200 R14: 0000000000000046 R15: dffffc0000000000
d_alloc_parallel+0x402/0x1600 fs/dcache.c:2472
__lookup_slow+0x117/0x3f0 fs/namei.c:1677
lookup_slow+0x53/0x70 fs/namei.c:1709
walk_component fs/namei.c:2004 [inline]
link_path_walk+0x9ea/0xea0 fs/namei.c:2331
path_openat+0x257/0x35f0 fs/namei.c:3809
do_filp_open+0x235/0x490 fs/namei.c:3840
do_sys_openat2+0x13e/0x1d0 fs/open.c:1413
do_sys_open fs/open.c:1428 [inline]
__do_sys_openat fs/open.c:1444 [inline]
__se_sys_openat fs/open.c:1439 [inline]
__x64_sys_openat+0x247/0x2a0 fs/open.c:1439
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6611d74610
Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 79 8d 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 cc 8d 02 00 8b 44
RSP: 002b:00007f6612c0ff70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6611d74610
RDX: 0000000000000000 RSI: 00007f6611de3609 RDI: 00000000ffffff9c
RBP: 00007f6611de3609 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 000000000000000b R14: 00007f6611f03f60 R15: 00007fff8a556e08
rcu: rcu_preempt kthread starved for 10496 jiffies! g108233 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:25584 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
__schedule_loop kernel/sched/core.c:6822 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6837
schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2000
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202
kthread+0x2f2/0x390 kernel/kthread.c:389
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 6020 Comm: kworker/u8:11 Not tainted 6.10.0-rc6-syzkaller-00067-g8a9c6c40432e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:311 [inline]
RIP: 0010:smp_call_function_many_cond+0x1865/0x29d0 kernel/smp.c:855
Code: 89 e6 83 e6 01 31 ff e8 c9 0c 0c 00 41 83 e4 01 49 bc 00 00 00 00 00 fc ff df 75 07 e8 74 08 0c 00 eb 38 f3 90 42 0f b6 04 23 <84> c0 75 11 41 f7 45 00 01 00 00 00 74 1e e8 58 08 0c 00 eb e4 44
RSP: 0018:ffffc90016267700 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 1ffff110172a8899 RCX: ffff88802f1d9e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900162678e0 R08: ffffffff818a1ec7 R09: 1ffffffff25f4eb0
R10: dffffc0000000000 R11: fffffbfff25f4eb1 R12: dffffc0000000000
R13: ffff8880b95444c8 R14: ffff8880b943f8c0 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555584448808 CR3: 000000000e132000 CR4: 0000000000350ef0
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1023
on_each_cpu include/linux/smp.h:71 [inline]
text_poke_sync arch/x86/kernel/alternative.c:2069 [inline]
text_poke_bp_batch+0x352/0xb30 arch/x86/kernel/alternative.c:2279
text_poke_flush arch/x86/kernel/alternative.c:2470 [inline]
text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2477
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:205
static_key_enable+0x1a/0x20 kernel/jump_label.c:218
toggle_allocation_gate+0xb5/0x250 mm/kfence/core.c:826
process_one_work kernel/workqueue.c:3248 [inline]
process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3329
worker_thread+0x86d/0xd50 kernel/workqueue.c:3409
kthread+0x2f2/0x390 kernel/kthread.c:389
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244