------------[ cut here ]------------ WARNING: CPU: 0 PID: 8659 at kernel/rcu/tree_stall.h:894 rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:886 Modules linked in: CPU: 0 PID: 8659 Comm: syz-fuzzer Not tainted 5.14.0-rc4-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 RIP: 0010:rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:894 Code: 0f 88 fa 00 00 00 be 04 00 00 00 48 c7 c7 60 45 22 90 e8 1e 30 5a 00 b8 01 00 00 00 87 05 a3 a5 c0 0e 85 c0 0f 85 c9 00 00 00 <0f> 0b 48 81 fd 80 48 98 8b 48 c7 c3 6c a5 6c 8d 74 58 48 b8 00 00 RSP: 0018:ffffc90000007e30 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 0000000100009977 RCX: ffffffff81619fb2 RDX: fffffbfff20448ac RSI: 0000000000000004 RDI: ffffffff90224560 RBP: ffffffff8b984880 R08: 0000000000000001 R09: 0000000000000003 R10: fffffbfff20448ac R11: 1ffff1100594a53e R12: 1ffffffff16c1e30 R13: 0000000000000246 R14: ffff88802ca52912 R15: 000000000000000a FS: 000000c00002e090(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000b794d0 CR3: 0000000029369000 CR4: 0000000000150ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_check_gp_start_stall kernel/rcu/tree_stall.h:857 [inline] rcu_core+0x4df/0x1380 kernel/rcu/tree.c:2780 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:finish_task_switch.isra.0+0x23c/0xa50 kernel/sched/core.c:4557 Code: 8b 3a 4c 89 e7 48 c7 02 00 00 00 00 ff d1 4d 85 ff 75 bf 4c 89 e7 e8 03 ff dc 07 e8 ae e4 2b 00 fb 65 48 8b 1c 25 00 f0 01 00 <48> 8d bb 10 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 RSP: 0018:ffffc900007a7b88 EFLAGS: 00000202 RAX: 0000000000550a49 RBX: ffff888014520000 RCX: 1ffffffff1ad88d9 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900007a7bc8 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff817bbe78 R11: 0000000000000001 R12: ffff88802ca51a80 R13: ffff8880163754c0 R14: 0000000000000000 R15: ffff88802ca51a98 context_switch kernel/sched/core.c:4686 [inline] __schedule+0x942/0x26f0 kernel/sched/core.c:5940 schedule+0xd3/0x270 kernel/sched/core.c:6019 freezable_schedule include/linux/freezer.h:172 [inline] do_nanosleep+0x24e/0x690 kernel/time/hrtimer.c:1896 hrtimer_nanosleep+0x1f9/0x4a0 kernel/time/hrtimer.c:1949 __do_sys_nanosleep kernel/time/hrtimer.c:1983 [inline] __se_sys_nanosleep kernel/time/hrtimer.c:1970 [inline] __x64_sys_nanosleep+0x1dc/0x260 kernel/time/hrtimer.c:1970 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x46dabd Code: 8b 44 24 20 b9 40 42 0f 00 f7 f1 48 89 04 24 b8 e8 03 00 00 f7 e2 48 89 44 24 08 48 89 e7 be 00 00 00 00 b8 23 00 00 00 0f 05 <48> 8b 6c 24 10 48 83 c4 18 c3 cc cc cc cc cc cc cc cc cc cc cc cc RSP: 002b:000000c00003df18 EFLAGS: 00000202 ORIG_RAX: 0000000000000023 RAX: ffffffffffffffda RBX: 0000000000000014 RCX: 000000000046dabd RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000c00003df18 RBP: 000000c00003df28 R08: 00000000000002b8 R09: 00007ffd0c1c8080 R10: 00007ffd0c1c8090 R11: 0000000000000202 R12: 000000000043b6a0 R13: 0000000000000000 R14: 000000000094d6b8 R15: 0000000000000000