rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5960/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=11445, q=532 ncpus=2)
task:syz-executor310 state:R running task stack:27032 pid:5960 tgid:5956 ppid:5864 task_flags:0x400040 flags:0x00080800
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x149b/0x4fd0 kernel/sched/core.c:6863
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7190
irqentry_exit+0x5e3/0x670 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x222/0x340 kernel/locking/lockdep.c:5872
Code: ff ff ff e8 70 50 bc 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 5a 4f e2 10 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 3f 2f bf 09 cc 48 8d 3d 17 8d e7
RSP: 0018:ffffc900048ffb30 EFLAGS: 00000286
RAX: 8cef3244dc6f3f00 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 000000005a44979c RSI: ffffffff8d978268 RDI: ffffffff8bc086e0
RBP: ffffffff822fa93a R08: ffffffff822fa93a R09: ffffffff8df41aa0
R10: ffff888068d938f8 R11: ffffffff81acf4d0 R12: 0000000000000002
R13: ffffffff8df41aa0 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:867 [inline]
get_mem_cgroup_from_objcg+0x3a/0x1d0 include/linux/memcontrol.h:517
__memcg_slab_post_alloc_hook+0x124/0x730 mm/memcontrol.c:3185
memcg_slab_post_alloc_hook mm/slub.c:2338 [inline]
slab_post_alloc_hook mm/slub.c:4964 [inline]
slab_alloc_node mm/slub.c:5263 [inline]
kmem_cache_alloc_lru_noprof+0x41f/0x6e0 mm/slub.c:5282
__d_alloc+0x37/0x6f0 fs/dcache.c:1730
d_alloc_pseudo+0x21/0xc0 fs/dcache.c:1861
alloc_path_pseudo fs/file_table.c:363 [inline]
alloc_file_pseudo+0xcc/0x210 fs/file_table.c:379
sock_alloc_file+0xb8/0x2e0 net/socket.c:483
sock_map_fd net/socket.c:513 [inline]
__sys_socket+0x13d/0x1b0 net/socket.c:1756
__do_sys_socket net/socket.c:1761 [inline]
__se_sys_socket net/socket.c:1759 [inline]
__x64_sys_socket+0x7a/0x90 net/socket.c:1759
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f94da5462c7
RSP: 002b:00007f94da4cb0d8 EFLAGS: 00000202 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007f94da5ce1f8 RCX: 00007f94da5462c7
RDX: 0000000000000010 RSI: 0000000000000003 RDI: 0000000000000010
RBP: 00007f94da5ce1f0 R08: 00007f94da4cc6c0 R09: 00007f94da4cc6c0
R10: 0000000000000000 R11: 0000000000000202 R12: 00007f94da5ce1fc
R13: 000000000000000b R14: 00007fffa3f037e0 R15: 00007fffa3f038c8
rcu: rcu_preempt kthread starved for 3622 jiffies! g11445 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:27904 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x149b/0x4fd0 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6960
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 14 Comm: kworker/R-mm_pe Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: 0x0 (mm_percpu_wq)
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_switch+0x97/0x130 kernel/kcov.c:351
Code: 54 53 48 8b 54 24 20 65 4c 8b 04 25 08 40 80 92 45 31 c9 eb 08 49 ff c1 4c 39 c8 74 77 4e 8b 54 ce 10 65 44 8b 1d 69 41 bf 10 <41> 81 e3 00 01 ff 00 74 13 41 81 fb 00 01 00 00 75 d9 41 83 b8 6c
RSP: 0018:ffffc90000007440 EFLAGS: 00000016
RAX: 0000000000000020 RBX: 0000000000000004 RCX: 0000000000000005
RDX: ffffffff81c2d495 RSI: ffffffff8df9a340 RDI: 0000000000000004
RBP: 0000004a53609bd9 R08: ffff88801c2f1e80 R09: 000000000000001b
R10: 000000000000001b R11: 0000000000010005 R12: dffffc0000000000
R13: ffff88813ff34010 R14: ffff88813ff341dc R15: 00000000000c7ec4
FS: 0000000000000000(0000) GS:ffff888125e1c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557a7d7770a8 CR3: 00000000333fc000 CR4: 00000000003526f0
Call Trace:
rb_event_length+0x45/0x400 kernel/trace/ring_buffer.c:222
rb_read_data_buffer+0x438/0x580 kernel/trace/ring_buffer.c:1858
check_buffer+0x28a/0x750 kernel/trace/ring_buffer.c:4412
__rb_reserve_next+0x592/0xdb0 kernel/trace/ring_buffer.c:4511
rb_reserve_next_event kernel/trace/ring_buffer.c:4648 [inline]
ring_buffer_lock_reserve+0xbb5/0x1010 kernel/trace/ring_buffer.c:4707
__trace_buffer_lock_reserve kernel/trace/trace.c:1079 [inline]
trace_event_buffer_lock_reserve+0x1d0/0x6f0 kernel/trace/trace.c:2808
trace_event_buffer_reserve+0x1ef/0x2d0 kernel/trace/trace_events.c:672
do_trace_event_raw_event_bpf_trace_printk kernel/trace/bpf_trace.h:11 [inline]
trace_event_raw_event_bpf_trace_printk+0x100/0x260 kernel/trace/bpf_trace.h:11
__do_trace_bpf_trace_printk kernel/trace/bpf_trace.h:11 [inline]
trace_bpf_trace_printk+0x153/0x1b0 kernel/trace/bpf_trace.h:11
____bpf_trace_printk kernel/trace/bpf_trace.c:379 [inline]
bpf_trace_printk+0x11e/0x190 kernel/trace/bpf_trace.c:362
bpf_prog_b1367f0be6c54012+0x39/0x3f
bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline]
bpf_trace_run1+0x27f/0x4c0 kernel/trace/bpf_trace.c:2115
__bpf_trace_rcu_utilization+0xa1/0xf0 include/trace/events/rcu.h:27
__traceiter_rcu_utilization+0x7a/0xb0 include/trace/events/rcu.h:27
__do_trace_rcu_utilization include/trace/events/rcu.h:27 [inline]
trace_rcu_utilization+0x191/0x1c0 include/trace/events/rcu.h:27
update_process_times+0x23c/0x2f0 kernel/time/timer.c:2474
tick_sched_handle kernel/time/tick-sched.c:298 [inline]
tick_nohz_handler+0x3e9/0x710 kernel/time/tick-sched.c:319
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x4d0/0xc30 kernel/time/hrtimer.c:1841
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
__sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:finish_task_switch+0x242/0x940 kernel/sched/core.c:5114
Code: 0f 84 c2 01 00 00 48 85 db 0f 85 e9 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 98 28 cb 09 e8 03 13 37 00 fb 4c 8b 65 c0 <49> 8d bc 24 48 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc900001377d8 EFLAGS: 00000206
RAX: 000000000000a9a9 RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8d794248 RDI: ffffffff8bc086e0
RBP: ffffc90000137830 R08: ffffffff8f823877 R09: 1ffffffff1f0470e
R10: dffffc0000000000 R11: fffffbfff1f0470f R12: ffff88801c2f1e80
R13: dffffc0000000000 R14: ffff888030f21e80 R15: ffff8880b863b498
context_switch kernel/sched/core.c:5259 [inline]
__schedule+0x14a3/0x4fd0 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6960
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7017
__mutex_lock_common kernel/locking/mutex.c:692 [inline]
__mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:776
worker_attach_to_pool+0x2e/0x3a0 kernel/workqueue.c:2672
rescuer_thread+0x351/0xed0 kernel/workqueue.c:3521
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246