rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6566
rcu: (detected by 1, t=10503 jiffies, g=18621, q=912 ncpus=2)
task:syz.1.27 state:R running task stack:26120 pid:6566 tgid:6565 ppid:6347 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7238
irqentry_exit+0x599/0x620 kernel/entry/common.c:239
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x20b/0x2e0 kernel/locking/lockdep.c:5872
Code: e9 30 ff ff ff e8 45 b5 0f 0a f7 c3 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 c1 22 7b 11 48 3b 44 24 30 75 33 fb 48 83 c4 38 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d be 4e 73
RSP: 0018:ffffc90002517478 EFLAGS: 00000286
RAX: 40a425c44c262d00 RBX: 0000000000000246 RCX: 0000000000000046
RDX: 000000005a44979c RSI: ffffffff8e19b8e3 RDI: ffffffff8c27ca80
RBP: 0000000000000000 R08: ffffffff81767e95 R09: ffffffff8e75e620
R10: ffffc900025175d8 R11: ffffffff81b0cfd0 R12: 0000000000000002
R13: ffffffff8e75e620 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
rcu_read_lock include/linux/rcupdate.h:850 [inline]
class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4538 [inline]
slab_alloc_node mm/slub.c:4866 [inline]
kmem_cache_alloc_lru_noprof+0x2b8/0x640 mm/slub.c:4885
__d_alloc+0x37/0x6f0 fs/dcache.c:1740
d_alloc_pseudo+0x21/0xc0 fs/dcache.c:1871
alloc_path_pseudo fs/file_table.c:364 [inline]
alloc_file_pseudo+0xdd/0x240 fs/file_table.c:380
__anon_inode_getfile fs/anon_inodes.c:166 [inline]
anon_inode_getfile+0xc5/0x1a0 fs/anon_inodes.c:204
bpf_link_prime+0xfc/0x220 kernel/bpf/syscall.c:3449
bpf_raw_tp_link_attach+0x4c4/0x700 kernel/bpf/syscall.c:4275
bpf_raw_tracepoint_open+0x1b2/0x220 kernel/bpf/syscall.c:4312
__sys_bpf+0x846/0x950 kernel/bpf/syscall.c:6270
__do_sys_bpf kernel/bpf/syscall.c:6341 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6339 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5d1559aef9
RSP: 002b:00007f5d1647f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f5d15805fa0 RCX: 00007f5d1559aef9
RDX: 0000000000000010 RSI: 0000200000000540 RDI: 0000000000000011
RBP: 00007f5d1562fee0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5d15806038 R14: 00007f5d15805fa0 R15: 00007fff61200f58
rcu: rcu_preempt kthread starved for 2405 jiffies! g18621 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:27656 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7008
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6362 Comm: udevd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:__sanitizer_cov_trace_switch+0x37/0x130 kernel/kcov.c:334
Code: c1 f8 48 c1 c1 3d 48 83 f9 02 7f 1e 48 85 c9 74 3c 48 83 f9 01 0f 85 f3 00 00 00 b9 03 00 00 00 48 85 c0 75 36 e9 e4 00 00 00 <48> 83 f9 03 0f 84 cc 00 00 00 48 83 f9 07 0f 85 d0 00 00 00 b9 07
RSP: 0018:ffffc900034c7108 EFLAGS: 00000002
RAX: 0000000000000020 RBX: 0000000000000004 RCX: 0000000000000003
RDX: 0000000000000000 RSI: ffffffff8e7beb00 RDI: 0000000000000004
RBP: 000000000000053c R08: ffff88802fdddb80 R09: 0000000000000020
R10: 000000000000001f R11: 0000000000000000 R12: dffffc0000000000
R13: 000000000000053c R14: ffff88813fe4e54c R15: 0000000000083944
FS: 0000000000000000(0000) GS:ffff888125455000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000012a3669a3638 CR3: 000000004687c000 CR4: 00000000003526f0
Call Trace:
rb_event_length+0x45/0x400 kernel/trace/ring_buffer.c:223
rb_read_data_buffer+0xdf/0x5a0 kernel/trace/ring_buffer.c:1863
check_buffer+0x28a/0x750 kernel/trace/ring_buffer.c:4435
__rb_reserve_next+0x5c5/0xe00 kernel/trace/ring_buffer.c:4534
rb_reserve_next_event kernel/trace/ring_buffer.c:4671 [inline]
ring_buffer_lock_reserve+0xbb5/0x1010 kernel/trace/ring_buffer.c:4730
__trace_buffer_lock_reserve kernel/trace/trace.h:1609 [inline]
trace_event_buffer_lock_reserve+0x1d2/0x700 kernel/trace/trace.c:2392
trace_event_buffer_reserve+0x1ef/0x2d0 kernel/trace/trace_events.c:688
do_trace_event_raw_event_bpf_trace_printk kernel/trace/bpf_trace.h:11 [inline]
trace_event_raw_event_bpf_trace_printk+0x11c/0x2c0 kernel/trace/bpf_trace.h:11
__do_trace_bpf_trace_printk kernel/trace/bpf_trace.h:11 [inline]
trace_bpf_trace_printk+0x187/0x200 kernel/trace/bpf_trace.h:11
____bpf_trace_printk kernel/trace/bpf_trace.c:379 [inline]
bpf_trace_printk+0x141/0x1c0 kernel/trace/bpf_trace.c:362
bpf_prog_b1367f0be6c54012+0x39/0x3f
bpf_dispatcher_nop_func include/linux/bpf.h:1402 [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:2088 [inline]
bpf_trace_run1+0x36f/0x830 kernel/trace/bpf_trace.c:2128
__bpf_trace_rcu_utilization+0xb4/0x100 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+0x1c4/0x200 include/trace/events/rcu.h:27
rcu_note_context_switch+0x6e/0xf40 kernel/rcu/tree_plugin.h:330
__schedule+0x304/0x52d0 kernel/sched/core.c:6794
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7095
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
_raw_spin_unlock_irqrestore+0x74/0x80 kernel/locking/spinlock.c:194
mm_destroy_cid include/linux/mm_types.h:1555 [inline]
__mmdrop+0x420/0x750 kernel/fork.c:734
exit_mm+0x168/0x220 kernel/exit.c:581
do_exit+0x6a2/0x23c0 kernel/exit.c:964
do_group_exit+0x21b/0x2d0 kernel/exit.c:1118
__do_sys_exit_group kernel/exit.c:1129 [inline]
__se_sys_exit_group kernel/exit.c:1127 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1127
x64_sys_call+0x221a/0x2240 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f97f72f16c5
Code: Unable to access opcode bytes at 0x7f97f72f169b.
RSP: 002b:00007ffedfbe02a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00005598dfa1f590 RCX: 00007f97f72f16c5
RDX: 00000000000000e7 RSI: fffffffffffffe68 RDI: 0000000000000000
RBP: 00005598df9ff910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffedfbe02f0 R14: 0000000000000000 R15: 0000000000000000