rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-....: (20 ticks this GP) idle=f2bc/1/0x4000000000000000 softirq=86019/86021 fqs=5243
rcu: hardirqs softirqs csw/system
rcu: number: 8389591 0 0
rcu: cputime: 24253 28264 0 ==> 52500(ms)
rcu: (detected by 0, t=10502 jiffies, g=118969, q=449 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 19794 Comm: syz.3.3765 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:mark_held_locks kernel/locking/lockdep.c:4266 [inline]
RIP: 0010:__trace_hardirqs_on_caller kernel/locking/lockdep.c:4292 [inline]
RIP: 0010:lockdep_hardirqs_on_prepare+0x20c/0x760 kernel/locking/lockdep.c:4359
Code: 00 00 83 3b 00 0f 8e e9 00 00 00 48 8b 44 24 10 4c 8d b8 e0 0a 00 00 4c 8d a0 00 0b 00 00 45 31 ed 49 83 fd 31 73 67 4c 89 e0 <48> c1 e8 03 0f b6 04 10 84 c0 75 76 41 8b 47 20 a9 00 00 04 00 74
RSP: 0018:ffffc900001f0540 EFLAGS: 00000097
RAX: ffff888026c96500 RBX: ffff888026c964d8 RCX: 2b99fd7df148c400
RDX: dffffc0000000000 RSI: ffffffff8aaac9c0 RDI: ffffffff8afc6f80
RBP: ffffc900001f05f0 R08: ffffffff8e4a212f R09: 1ffffffff1c94425
R10: dffffc0000000000 R11: fffffbfff1c94426 R12: ffff888026c96500
R13: 0000000000000000 R14: 1ffff11004d92c9b R15: ffff888026c964e0
FS: 00007f39d4e2c6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000050000 CR3: 0000000059c4c000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
trace_hardirqs_on+0x28/0x40 kernel/trace/trace_preemptirq.c:61
asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723
RIP: 0010:preempt_count_sub+0x0/0x160 kernel/sched/core.c:5867
Code: 03 38 c1 0f 8c 6e ff ff ff 48 c7 c7 f0 55 4a 8e e8 d5 8f 81 00 89 df e9 5b ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 0f 1e fa 55 53 48 bb 00 00 00 00 00 fc ff df 48 c7 c0 80 b4 e9
RSP: 0018:ffffc900001f06b0 EFLAGS: 00000246
RAX: ffffffff813ac02f RBX: ffffc90003460001 RCX: ffff888026c95a00
RDX: 0000000000000100 RSI: ffffc90003467d80 RDI: 0000000000000001
RBP: ffffc90003467d80 R08: ffff888026c95a00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: ffffc900001f0788
R13: dffffc0000000000 R14: ffffc90003467ef8 R15: ffffc900001f0798
unwind_next_frame+0x1d07/0x2970 arch/x86/kernel/unwind_orc.c:672
arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1811 [inline]
slab_free_freelist_hook+0x130/0x1b0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
kmem_cache_free+0xf8/0x280 mm/slub.c:3852
rcu_do_batch kernel/rcu/tree.c:2194 [inline]
rcu_core+0xcc4/0x1720 kernel/rcu/tree.c:2467
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:7009
Code: 44 24 20 f6 44 24 21 02 74 0b 0f 0b 48 f7 03 08 00 00 00 74 63 bf 01 00 00 00 e8 8b b3 eb f6 e8 26 3a 1c f7 fb bf 01 00 00 00 db b5 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc90003467880 EFLAGS: 00000282
RAX: 2b99fd7df148c400 RBX: 0000000000000000 RCX: 2b99fd7df148c400
RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: 0000000000000001
RBP: ffffc90003467920 R08: ffffffff90d94537 R09: 1ffffffff21b28a6
R10: dffffc0000000000 R11: fffffbfff21b28a7 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200068cf10
irqentry_exit+0x67/0x70 kernel/entry/common.c:438
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:lock_acquire+0x1f2/0x410 kernel/locking/lockdep.c:5758
Code: 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 0f 85 f5 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 66 43 c7 44 3c 09 00 00 43 c6 44 3c 0b 00
RSP: 0018:ffffc900034679e0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 2b99fd7df148c400
RDX: 0000000000000000 RSI: ffffffff8aaace60 RDI: ffffffff8afc6f80
RBP: ffffc90003467b00 R08: dffffc0000000000 R09: 1ffffffff21b28a6
R10: dffffc0000000000 R11: fffffbfff21b28a7 R12: 1ffff9200068cf48
R13: ffff88801cbf14a0 R14: 0000000000000246 R15: dffffc0000000000
__might_fault+0xc6/0x120 mm/memory.c:5968
strncpy_from_user+0x31/0x2e0 lib/strncpy_from_user.c:117
bpf_prog_load+0xd0e/0x16d0 kernel/bpf/syscall.c:2711
__sys_bpf+0x55a/0x800 kernel/bpf/syscall.c:5473
__do_sys_bpf kernel/bpf/syscall.c:5577 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5575 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5575
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f39d3f8f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f39d4e2c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f39d41e5fa0 RCX: 00007f39d3f8f749
RDX: 0000000000000094 RSI: 0000200000000a40 RDI: 0000000000000005
RBP: 00007f39d4013f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f39d41e6038 R14: 00007f39d41e5fa0 R15: 00007ffcb1e95e38