rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=6cd4/1/0x4000000000000000 softirq=83014/83015 fqs=5062 rcu: hardirqs softirqs csw/system rcu: number: 1417000 0 0 rcu: cputime: 17531 34948 64 ==> 52500(ms) rcu: (t=10502 jiffies g=123201 q=2272 ncpus=2) CPU: 0 PID: 19419 Comm: syz.1.4356 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:212 Code: 00 0f 0b 0f 1f 80 00 00 00 00 f3 0f 1e fa 53 48 89 fb e8 13 00 00 00 48 8b 3d 0c 3d 04 0d 48 89 de 5b e9 c3 70 57 00 cc cc cc 0f 1e fa 48 8b 04 24 65 48 8b 0d a0 8a 7c 7e 65 8b 15 a1 8a 7c RSP: 0018:ffffc900000075c0 EFLAGS: 00000246 RAX: ffff888077808000 RBX: ffffc90000007680 RCX: ffff888077808000 RDX: 0000000000000100 RSI: ffffc90000007680 RDI: ffffffff8175c750 RBP: ffffc90000007650 R08: ffffc900000079f0 R09: 0000000000000000 R10: ffffc90000007710 R11: ffffed10298e8cc1 R12: ffff888077808000 R13: 00000000000000f0 R14: ffffffff8175c750 R15: 0000000000000000 FS: 00007f29799ed6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000000 CR3: 000000006ad91000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: get_stack_pointer arch/x86/include/asm/stacktrace.h:96 [inline] unwind_start arch/x86/include/asm/unwind.h:62 [inline] arch_stack_walk+0x80/0x190 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767 slab_alloc_node mm/slub.c:3495 [inline] kmem_cache_alloc_node+0x14c/0x320 mm/slub.c:3540 __alloc_skb+0x103/0x2c0 net/core/skbuff.c:643 alloc_skb include/linux/skbuff.h:1316 [inline] new_skb drivers/block/aoe/aoecmd.c:66 [inline] aoecmd_cfg_pkts drivers/block/aoe/aoecmd.c:430 [inline] aoecmd_cfg+0x2c5/0xa50 drivers/block/aoe/aoecmd.c:1374 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x542/0x800 kernel/time/timer.c:2023 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036 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+0xd3/0x190 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xc0/0x120 kernel/locking/spinlock.c:194 Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 2b 88 ca f6 65 8b 05 bc b0 71 75 85 c0 74 3c 48 c7 04 24 0e 36 RSP: 0018:ffffc90003537ac0 EFLAGS: 00000206 RAX: dffffc0000000004 RBX: 0000000000000a02 RCX: 4267d9f4b2883200 RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: 0000000000000001 RBP: ffffc90003537b50 R08: ffffffff8e8b666f R09: 1ffffffff1d16ccd R10: dffffc0000000000 R11: fffffbfff1d16cce R12: dffffc0000000000 R13: ffff888060595a14 R14: ffff888060596400 R15: 1ffff920006a6f58 class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:522 [inline] try_to_wake_up+0x70a/0x1190 kernel/sched/core.c:4233 wake_up_process kernel/sched/core.c:4481 [inline] wake_up_q+0xb6/0x100 kernel/sched/core.c:1032 futex_wake+0x42a/0x4f0 kernel/futex/waitwake.c:184 do_futex+0x35d/0x3e0 kernel/futex/syscalls.c:139 __do_sys_futex kernel/futex/syscalls.c:211 [inline] __se_sys_futex+0x3a9/0x440 kernel/futex/syscalls.c:192 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f2978b9ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f29799ed0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f2978e15fa8 RCX: 00007f2978b9ce59 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f2978e15fac RBP: 00007f2978e15fa0 R08: 0000000000745d1e R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2978e16038 R14: 00007ffd83703900 R15: 00007ffd837039e8