rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 ticks this GP) idle=617/1/0x4000000000000000 softirq=48083/48083 fqs=0 (detected by 1, t=10502 jiffies, g=72657, q=216) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 12363 Comm: syz-executor.4 Not tainted 5.18.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1702 [inline] RIP: 0010:__hrtimer_run_queues+0xaf0/0xe50 kernel/time/hrtimer.c:1749 Code: 0d a5 fa 9a 7e 40 0f 94 c5 31 ff 89 ee e8 c8 dc 10 00 40 84 ed 0f 84 80 f9 ff ff e8 da d8 10 00 e8 54 cf 98 ff e9 71 f9 ff ff cb d8 10 00 31 d2 4c 89 ee 48 89 df e8 de de ff ff e9 8f f7 ff RSP: 0018:ffffc90000007e40 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff8880753e8b40 RCX: ffff88802d986140 RDX: 0000000000000000 RSI: ffff88802d986140 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81676cdd R11: 0000000000000000 R12: 0000000000000000 R13: ffff8880b9c2a6c0 R14: ffff8880b9c2a5c0 R15: 0000000000000001 FS: 00005555558ef400(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000040 CR3: 00000000299bd000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:__syscall_enter_from_user_work kernel/entry/common.c:89 [inline] RIP: 0010:syscall_enter_from_user_mode+0x2b/0x70 kernel/entry/common.c:110 Code: 54 49 89 f4 55 48 89 fd 48 8b 7c 24 10 e8 ed f5 ff ff eb 27 eb 2b e8 a4 ff 1e f8 e8 1f fc 1e f8 fb 65 48 8b 04 25 00 70 02 00 <48> 8b 70 08 40 f6 c6 3f 75 19 4c 89 e0 5d 41 5c c3 eb 1b 0f 0b eb RSP: 0018:ffffc9000482ff28 EFLAGS: 00000202 RAX: ffff88802d986140 RBX: 0000000000000000 RCX: 1ffffffff1b6d3a1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000482ff58 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff817e9708 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 do_syscall_64+0x16/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f172a03bd2b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffc8b654320 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007f172a03bd2b RDX: ffffffffffffffb8 RSI: ffffffffffffffff RDI: 000000000000000a RBP: 00007f172a19d960 R08: 0000000000000000 R09: 00007f172a1a0348 R10: 00007ffc8b654420 R11: 0000000000000293 R12: 0000000000097d84 R13: 00007ffc8b654420 R14: 00007f172a19bf60 R15: 0000000000000032 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g72657 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=42448 rcu: rcu_preempt kthread starved for 10502 jiffies! g72657 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 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:28944 pid: 16 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5073 [inline] __schedule+0xa9a/0x4cc0 kernel/sched/core.c:6388 schedule+0xd2/0x1f0 kernel/sched/core.c:6460 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1884 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1971 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2144 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 12363 Comm: syz-executor.4 Not tainted 5.18.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:trace_hrtimer_expire_exit include/trace/events/timer.h:279 [inline] RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1688 [inline] RIP: 0010:__hrtimer_run_queues+0xa29/0xe50 kernel/time/hrtimer.c:1749 Code: 6d fb 9a 7e 48 c7 c0 e0 7c a2 8d 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 d5 03 00 00 48 8b 05 67 08 3b 0c 22 59 fb ff 31 ff 41 89 c4 89 c6 e8 a6 db 10 00 45 85 e4 0f 84 RSP: 0018:ffffc90000007e40 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff8880753e8b40 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffffffff8167744c RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff81676c7d R11: 0000000000000000 R12: 0000000000000001 R13: ffff8880b9c2a6c0 R14: ffff8880b9c2a5c0 R15: 0000000000000001 FS: 00005555558ef400(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000040 CR3: 00000000299bd000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:__syscall_enter_from_user_work kernel/entry/common.c:89 [inline] RIP: 0010:syscall_enter_from_user_mode+0x2b/0x70 kernel/entry/common.c:110 Code: 54 49 89 f4 55 48 89 fd 48 8b 7c 24 10 e8 ed f5 ff ff eb 27 eb 2b e8 a4 ff 1e f8 e8 1f fc 1e f8 fb 65 48 8b 04 25 00 70 02 00 <48> 8b 70 08 40 f6 c6 3f 75 19 4c 89 e0 5d 41 5c c3 eb 1b 0f 0b eb RSP: 0018:ffffc9000482ff28 EFLAGS: 00000202 RAX: ffff88802d986140 RBX: 0000000000000000 RCX: 1ffffffff1b6d3a1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000482ff58 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff817e9708 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 do_syscall_64+0x16/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f172a03bd2b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffc8b654320 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007f172a03bd2b RDX: ffffffffffffffb8 RSI: ffffffffffffffff RDI: 000000000000000a RBP: 00007f172a19d960 R08: 0000000000000000 R09: 00007f172a1a0348 R10: 00007ffc8b654420 R11: 0000000000000293 R12: 0000000000097d84 R13: 00007ffc8b654420 R14: 00007f172a19bf60 R15: 0000000000000032 ---------------- Code disassembly (best guess): 0: 0d a5 fa 9a 7e or $0x7e9afaa5,%eax 5: 40 0f 94 c5 sete %bpl 9: 31 ff xor %edi,%edi b: 89 ee mov %ebp,%esi d: e8 c8 dc 10 00 callq 0x10dcda 12: 40 84 ed test %bpl,%bpl 15: 0f 84 80 f9 ff ff je 0xfffff99b 1b: e8 da d8 10 00 callq 0x10d8fa 20: e8 54 cf 98 ff callq 0xff98cf79 25: e9 71 f9 ff ff jmpq 0xfffff99b * 2a: e8 cb d8 10 00 callq 0x10d8fa <-- trapping instruction 2f: 31 d2 xor %edx,%edx 31: 4c 89 ee mov %r13,%rsi 34: 48 89 df mov %rbx,%rdi 37: e8 de de ff ff callq 0xffffdf1a 3c: e9 .byte 0xe9 3d: 8f (bad) 3e: f7 ff idiv %edi