------------[ cut here ]------------ WARNING: CPU: 0 PID: 12 at kernel/rcu/tree_stall.h:770 rcu_check_gp_start_stall.part.0+0x1b2/0x2b0 kernel/rcu/tree_stall.h:762 Modules linked in: CPU: 0 PID: 12 Comm: ksoftirqd/0 Not tainted 5.11.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:rcu_check_gp_start_stall.part.0+0x1b2/0x2b0 kernel/rcu/tree_stall.h:770 Code: 78 0a 48 01 c3 48 39 da 78 5d be 04 00 00 00 48 c7 c7 a0 53 bf 8f e8 ed 3e 56 00 b8 01 00 00 00 87 05 12 e1 5f 0e 85 c0 75 34 <0f> 0b 48 81 fd 40 c0 d7 8b 74 0c 48 c7 c7 40 c0 d7 8b e8 a7 93 9d RSP: 0018:ffffc90000d17cf0 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 00000000fffffdd4 RCX: ffffffff815f7283 RDX: fffffbfff1f7ea74 RSI: 0000000000000004 RDI: ffffffff8fbf53a0 RBP: ffffffff8bd7c040 R08: 0000000000000001 R09: 0000000000000003 R10: fffffbfff1f7ea74 R11: ffffffff8bd7c088 R12: 1ffffffff1741e30 R13: 0000000000000246 R14: ffff8880b9c35a92 R15: ffff8880b9c35b18 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055fd2297f018 CR3: 000000000ba8e000 CR4: 0000000000350ef0 Call Trace: rcu_check_gp_start_stall kernel/rcu/tree_stall.h:733 [inline] rcu_core+0x3b1/0xf00 kernel/rcu/tree.c:2718 __do_softirq+0x29b/0x9f6 kernel/softirq.c:343 run_ksoftirqd kernel/softirq.c:650 [inline] run_ksoftirqd+0x2d/0x50 kernel/softirq.c:642 smpboot_thread_fn+0x655/0x9e0 kernel/smpboot.c:165 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296