rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P10507/1:b..l
	(detected by 0, t=10502 jiffies, g=53273, q=1281 ncpus=2)
task:syz.3.1700      state:R  running task     stack:24496 pid:10507 ppid:4274   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874
 irqentry_exit+0x63/0x70 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:kmalloc_size_roundup+0x83/0xc0 mm/slab_common.c:-1
Code: 12 ff c8 89 44 24 04 b8 ff ff ff ff 0f bd 44 24 04 ff c0 89 c3 83 f8 0e 73 30 48 8b 04 dd 70 13 65 8c 48 85 c0 74 05 8b 40 1c <eb> 02 31 c0 48 83 c4 10 5b c3 be 00 10 00 00 48 c7 c7 d0 21 bf 8c
RSP: 0018:ffffc9001c997748 EFLAGS: 00000282
RAX: 0000000000000200 RBX: 0000000000000009 RCX: 0000000000000201
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000200
RBP: 0000000000000a20 R08: ffff88807308b9a7 R09: 1ffff1100e611734
R10: dffffc0000000000 R11: ffffed100e611735 R12: 0000000000000a20
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88807308b93e
 kmalloc_reserve net/core/skbuff.c:436 [inline]
 pskb_expand_head+0x182/0x12a0 net/core/skbuff.c:1848
 __bpf_try_make_writable net/core/filter.c:1674 [inline]
 bpf_try_make_writable net/core/filter.c:1680 [inline]
 bpf_try_make_head_writable net/core/filter.c:1688 [inline]
 ____bpf_clone_redirect net/core/filter.c:2467 [inline]
 bpf_clone_redirect+0x1e3/0x4a0 net/core/filter.c:2436
 bpf_prog_c6f54bbad6dab1ee+0x56/0x5b
 bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline]
 __bpf_prog_run include/linux/filter.h:607 [inline]
 bpf_prog_run include/linux/filter.h:614 [inline]
 bpf_test_run+0x2b6/0x830 net/bpf/test_run.c:402
 bpf_prog_test_run_skb+0xaa6/0x12a0 net/bpf/test_run.c:1191
 bpf_prog_test_run+0x31e/0x390 kernel/bpf/syscall.c:3695
 __sys_bpf+0x62b/0x780 kernel/bpf/syscall.c:5048
 __do_sys_bpf kernel/bpf/syscall.c:5134 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5132 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5132
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fef04b9c799
RSP: 002b:00007fef02dd5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fef04e16090 RCX: 00007fef04b9c799
RDX: 0000000000000050 RSI: 0000200000002280 RDI: 000000000000000a
RBP: 00007fef04c32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fef04e16128 R14: 00007fef04e16090 R15: 00007ffffbcf8dc8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10462 jiffies! g53273 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=23729
rcu: rcu_preempt kthread starved for 10463 jiffies! g53273 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26096 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
 schedule+0xb9/0x180 kernel/sched/core.c:6638
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x303/0x1340 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x99/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 10504 Comm: syz.4.1699 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:check_preemption_disabled+0xa/0x110 lib/smp_processor_id.c:13
Code: bc 0b fa e9 6e ff ff ff 00 00 cc cc 00 00 cc cc 48 c7 c7 00 0f df 8a 48 c7 c6 40 0f df 8a eb 00 55 41 57 41 56 53 48 83 ec 10 <65> 48 8b 04 25 28 00 00 00 48 89 44 24 08 65 8b 05 51 ff d4 75 65
RSP: 0018:ffffc900001e0f08 EFLAGS: 00000082
RAX: 0000000000000001 RBX: ffff8880755b9dc0 RCX: 0000000000010001
RDX: 1ffffffff1f41608 RSI: ffffffff8a8b07e0 RDI: ffffffff8adf0f60
RBP: ffffc900001e0fe0 R08: ffffffff8fa0b048 R09: ffffffff8fa0b058
R10: ffffffff8fa0b050 R11: ffffffff8fa0b043 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffff9200003c1e8
FS:  00007f0d167066c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c274b58 CR3: 000000007d652000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000008d24
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __irq_exit_rcu+0xc1/0x230 kernel/softirq.c:678
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0x9d/0xc0 arch/x86/kernel/irq_work.c:17
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 e2 33 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc9001c937680 EFLAGS: 00000206
RAX: 3ebb713e060ba800 RBX: 1ffff92003926ed8 RCX: 3ebb713e060ba800
RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: ffffffff8adf0f60
RBP: ffffc9001c937780 R08: ffffffff90af62df R09: 1ffffffff215ec5b
R10: dffffc0000000000 R11: fffffbfff215ec5c R12: 0000000000000246
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffffff8cb32c58
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 d_alloc_parallel+0x1224/0x1530 fs/dcache.c:2736
 lookup_open fs/namei.c:3415 [inline]
 open_last_lookups fs/namei.c:3558 [inline]
 path_openat+0x927/0x2ee0 fs/namei.c:3788
 do_filp_open+0x1f1/0x430 fs/namei.c:3818
 do_sys_openat2+0x150/0x4b0 fs/open.c:1320
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1347
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0d1575cfce
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007f0d16705ec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f0d167066c0 RCX: 00007f0d1575cfce
RDX: 0000000000000002 RSI: 00007f0d16705f90 RDI: ffffffffffffff9c
RBP: 00007f0d15832bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0d15a16038 R14: 00007f0d15a15fa0 R15: 00007ffce6902a08
 </TASK>