watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.0:9851] Modules linked in: irq event stamp: 3744455 hardirqs last enabled at (3744454): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (3744455): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (127538): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (133389): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (133389): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 9851 Comm: syz-executor.0 Not tainted 4.14.271-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a7df4580 task.stack: ffff88804e0e0000 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x50/0x80 kernel/locking/spinlock.c:200 RSP: 0018:ffff8880ba407df8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff11e12f3 RBX: dffffc0000000000 RCX: 1ffff11014fbe9c5 RDX: dffffc0000000000 RSI: ffff8880a7df4e30 RDI: ffff8880a7df4e04 RBP: ffff8880ba42cb00 R08: ffffffff8b9c7430 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ba42cb00 R13: ffff8880ba407e98 R14: 1ffff11017480fd3 R15: ffffffff8636fe20 FS: 00007ff7d0bd3700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff9c8dcf00 CR3: 00000000a5f76000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: expire_timers+0x222/0x4d0 kernel/time/timer.c:1318 __run_timers kernel/time/timer.c:1637 [inline] run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1650 __do_softirq+0x24d/0x9ff kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x193/0x240 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:638 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1106 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:lock_acquire+0x1ec/0x3f0 kernel/locking/lockdep.c:4001 RSP: 0018:ffff88804e0e77f8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff11e12f1 RBX: ffff8880a7df4580 RCX: fc58f755537e7282 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000286 RBP: ffffffff88f77d40 R08: 0000000000000000 R09: 0000000000020012 R10: ffff8880a7df4e30 R11: ffff8880a7df4580 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:629 [inline] lock_page_memcg+0x36/0x200 mm/memcontrol.c:1640 page_remove_file_rmap+0x2d/0x690 mm/rmap.c:1208 page_remove_rmap+0x96/0xe0 mm/rmap.c:1293 zap_pte_range mm/memory.c:1364 [inline] zap_pmd_range mm/memory.c:1466 [inline] zap_pud_range mm/memory.c:1495 [inline] zap_p4d_range mm/memory.c:1516 [inline] unmap_page_range+0xf3f/0x1ce0 mm/memory.c:1537 unmap_single_vma+0x147/0x2b0 mm/memory.c:1582 unmap_vmas+0x9d/0x160 mm/memory.c:1612 exit_mmap+0x270/0x4d0 mm/mmap.c:3058 __mmput kernel/fork.c:931 [inline] mmput kernel/fork.c:952 [inline] mmput+0xfa/0x420 kernel/fork.c:947 copy_process.part.0+0x418d/0x71c0 kernel/fork.c:1997 copy_process kernel/fork.c:1606 [inline] _do_fork+0x184/0xc80 kernel/fork.c:2092 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7ff7d225e049 RSP: 002b:00007ff7d0bd3118 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ff7d2370f60 RCX: 00007ff7d225e049 RDX: 0000000020000200 RSI: 0000000000000000 RDI: 0000000072a66000 RBP: 00007ff7d22b808d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000780 R11: 0000000000000206 R12: 0000000000000000 R13: 00007ffd04992baf R14: 00007ff7d0bd3300 R15: 0000000000022000 Code: c7 c0 98 97 f0 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d 51 5e cc 01 00 74 25 fb 66 0f 1f 44 00 00 01 00 00 00 e8 c6 e9 14 fa 65 8b 05 ef 45 de 78 85 c0 74 02 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9858 Comm: syz-executor.5 Not tainted 4.14.271-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a3b40040 task.stack: ffff88804e198000 RIP: 0010:trace_hardirqs_on_caller+0x27/0x580 kernel/locking/lockdep.c:2895 RSP: 0018:ffff88804e19f448 EFLAGS: 00000006 RAX: 0000000000000003 RBX: 0000000000000000 RCX: 1ffffffff127a49c RDX: 0000000000000004 RSI: ffffffff87ccfb40 RDI: ffffffff87400976 RBP: ffffffff87400976 R08: ffff88823fff7058 R09: ffff88823fff704f R10: ffff88823fff7057 R11: 0000003c391cc920 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fb1aaa36700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564a599cbf98 CR3: 00000000aae29000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_hardirqs_on_thunk+0x1a/0x1c retint_kernel+0x2d/0x2d RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa3/0xe0 kernel/locking/spinlock.c:192 RSP: 0018:ffff88804e19f568 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff11e12f1 RBX: 0000000000000286 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000286 RBP: ffffffff8c05adc8 R08: 1ffff11014c7954c R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88804d400000 R13: 0000000000000009 R14: ffffffff8c05adc8 R15: ffff8880a63caa48 __debug_check_no_obj_freed lib/debugobjects.c:760 [inline] debug_check_no_obj_freed+0x2c0/0x680 lib/debugobjects.c:776 free_pages_prepare mm/page_alloc.c:1064 [inline] __free_pages_ok+0x215/0xeb0 mm/page_alloc.c:1262 release_pages+0x779/0xbf0 mm/swap.c:788 tlb_flush_mmu_free+0xc1/0x1a0 mm/memory.c:272 zap_pte_range mm/memory.c:1431 [inline] zap_pmd_range mm/memory.c:1466 [inline] zap_pud_range mm/memory.c:1495 [inline] zap_p4d_range mm/memory.c:1516 [inline] unmap_page_range+0x1533/0x1ce0 mm/memory.c:1537 unmap_single_vma+0x147/0x2b0 mm/memory.c:1582 unmap_vmas+0x9d/0x160 mm/memory.c:1612 exit_mmap+0x270/0x4d0 mm/mmap.c:3058 __mmput kernel/fork.c:931 [inline] mmput kernel/fork.c:952 [inline] mmput+0xfa/0x420 kernel/fork.c:947 exit_mm kernel/exit.c:548 [inline] do_exit+0x984/0x2850 kernel/exit.c:855 do_group_exit+0x100/0x2e0 kernel/exit.c:965 get_signal+0x38d/0x1ca0 kernel/signal.c:2412 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fb1ac0c1049 RSP: 002b:00007fb1aaa36118 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: fffffffffffffffc RBX: 00007fb1ac1d3f60 RCX: 00007fb1ac0c1049 RDX: 0000000020000200 RSI: 0000000000000000 RDI: 0000000072a66000 RBP: 00007fb1ac11b08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000780 R11: 0000000000000206 R12: 0000000000000000 R13: 00007ffc065095cf R14: 00007fb1aaa36300 R15: 0000000000022000 Code: 00 00 00 00 48 c7 c0 e0 24 3d 89 55 48 89 fd 48 ba 00 00 00 00 00 fc ff df 48 89 c1 53 83 e0 07 48 c1 e9 03 83 c0 03 0f b6 14 11 <38> d0 7c 08 84 d2 0f 85 c5 03 00 00 8b 1d b7 ad fb 07 85 db 0f ---------------- Code disassembly (best guess): 0: c7 c0 98 97 f0 88 mov $0x88f09798,%eax 6: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx d: fc ff df 10: 48 c1 e8 03 shr $0x3,%rax 14: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) 18: 75 31 jne 0x4b 1a: 48 83 3d 51 5e cc 01 cmpq $0x0,0x1cc5e51(%rip) # 0x1cc5e73 21: 00 22: 74 25 je 0x49 24: fb sti 25: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) * 2b: bf 01 00 00 00 mov $0x1,%edi <-- trapping instruction 30: e8 c6 e9 14 fa callq 0xfa14e9fb 35: 65 8b 05 ef 45 de 78 mov %gs:0x78de45ef(%rip),%eax # 0x78de462b 3c: 85 c0 test %eax,%eax 3e: 74 02 je 0x42