watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.4:20879] Modules linked in: irq event stamp: 3319809 hardirqs last enabled at (3319808): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (3319809): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (44100): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (44311): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (44311): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 0 PID: 20879 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__read_once_size include/linux/compiler.h:263 [inline] RIP: 0010:__dev_queue_xmit+0x7b4/0x2e00 net/core/dev.c:3803 Code: 24 20 4c 89 fe 48 8b 3c 24 e8 78 f5 ff ff 48 8d 78 08 49 89 c4 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 d5 22 00 00 49 8b 5c 24 08 e8 1c 2c da fa 31 ff 89 c5 89 c6 RSP: 0018:ffff8880ba007b60 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff86766812 RDX: 1ffff110144cb0f9 RSI: ffffffff867668f6 RDI: ffff8880a26587c8 RBP: ffff88801b729758 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880a26587c0 R13: 000000000000001a R14: 0000000000000000 R15: ffff88801b729700 FS: 00007fcc03a66700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdc23dcc20 CR3: 000000003a25d000 CR4: 00000000003426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mrp_queue_xmit net/802/mrp.c:367 [inline] mrp_join_timer+0x8a/0xc0 net/802/mrp.c:611 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1696 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:67 Code: 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3 aa <4c> 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01 RSP: 0018:ffff888037dd76b8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc00000000fc RBX: ffff888044dbee00 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 00000000000000fc RDI: ffffed10089b7dc0 RBP: ffff888044dbede0 R08: ffffed10089b7dbc R09: ffffed10089b7dc0 R10: 00000000db9d97ca R11: 00000000cfef62e7 R12: 00000000006080c0 R13: 0000000000000000 R14: ffff88823a7764c0 R15: 0000000000000020 kasan_poison_shadow mm/kasan/kasan.c:64 [inline] kasan_kmalloc+0x84/0x160 mm/kasan/kasan.c:549 nla_parse: 3 callbacks suppressed netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. IPv6: ADDRCONF(NETDEV_UP): vlan620: link is not ready kmem_cache_alloc+0x122/0x370 mm/slab.c:3559 kmem_cache_zalloc include/linux/slab.h:699 [inline] mmu_topup_memory_cache arch/x86/kvm/mmu.c:996 [inline] mmu_topup_memory_cache arch/x86/kvm/mmu.c:988 [inline] mmu_topup_memory_caches+0x8f/0x370 arch/x86/kvm/mmu.c:1042 kvm_mmu_load+0x1e/0x1200 arch/x86/kvm/mmu.c:5111 kvm_mmu_reload arch/x86/kvm/mmu.h:86 [inline] vcpu_enter_guest arch/x86/kvm/x86.c:7724 [inline] vcpu_run arch/x86/kvm/x86.c:7920 [inline] kvm_arch_vcpu_ioctl_run+0x4e5e/0x6f70 arch/x86/kvm/x86.c:8120 kvm_vcpu_ioctl+0x493/0xe10 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2847 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fcc064f0a39 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcc03a66188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fcc065f3f60 RCX: 00007fcc064f0a39 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 RBP: 00007fcc0654ac5f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd417d986f R14: 00007fcc03a66300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8076 Comm: kworker/u4:5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-8:0) RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline] RIP: 0010:smp_call_function_single+0x1e0/0x420 kernel/smp.c:302 Code: 00 48 8b 4c 24 08 48 8b 54 24 10 48 8d 74 24 40 8b 7c 24 1c e8 a1 f9 ff ff 41 89 c5 eb 07 e8 e7 03 0a 00 f3 90 44 8b 64 24 58 <31> ff 41 83 e4 01 44 89 e6 e8 42 05 0a 00 45 85 e4 75 e1 e8 c8 03 RSP: 0018:ffff88808d2dece0 EFLAGS: 00000293 RAX: ffff888095aea0c0 RBX: 1ffff11011a5bda0 RCX: ffffffff8158819e RDX: 0000000000000000 RSI: ffffffff81588189 RDI: 0000000000000005 RBP: ffff88808d2deda8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000003324d000 CR4: 00000000003426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: smp_call_function_many+0x743/0x8d0 kernel/smp.c:434 flush_tlb_others arch/x86/include/asm/paravirt.h:309 [inline] flush_tlb_mm_range+0x179/0x320 arch/x86/mm/tlb.c:728 flush_tlb_page arch/x86/include/asm/tlbflush.h:576 [inline] ptep_clear_flush+0x123/0x160 mm/pgtable-generic.c:87 page_mkclean_one+0x425/0x860 mm/rmap.c:912 rmap_walk_file+0x539/0xb10 mm/rmap.c:1897 rmap_walk+0x105/0x190 mm/rmap.c:1915 page_mkclean+0x20f/0x2b0 mm/rmap.c:981 clear_page_dirty_for_io+0x305/0xee0 mm/page-writeback.c:2687 mpage_submit_page+0x80/0x250 fs/ext4/inode.c:2215 mpage_process_page_bufs+0x534/0x630 fs/ext4/inode.c:2345 mpage_prepare_extent_to_map+0x9a2/0xf10 fs/ext4/inode.c:2707 ext4_writepages+0x111d/0x37f0 fs/ext4/inode.c:2835 do_writepages+0xe5/0x290 mm/page-writeback.c:2344 __writeback_single_inode+0x10c/0x11d0 fs/fs-writeback.c:1385 writeback_sb_inodes+0x537/0xef0 fs/fs-writeback.c:1647 __writeback_inodes_wb+0xc6/0x280 fs/fs-writeback.c:1716 wb_writeback+0x841/0xcc0 fs/fs-writeback.c:1822 wb_check_old_data_flush fs/fs-writeback.c:1924 [inline] wb_do_writeback fs/fs-writeback.c:1977 [inline] wb_workfn+0x8ba/0x1250 fs/fs-writeback.c:2006 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 ---------------- Code disassembly (best guess): 0: 24 20 and $0x20,%al 2: 4c 89 fe mov %r15,%rsi 5: 48 8b 3c 24 mov (%rsp),%rdi 9: e8 78 f5 ff ff callq 0xfffff586 e: 48 8d 78 08 lea 0x8(%rax),%rdi 12: 49 89 c4 mov %rax,%r12 15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1c: fc ff df 1f: 48 89 fa mov %rdi,%rdx 22: 48 c1 ea 03 shr $0x3,%rdx 26: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) * 2a: 0f 85 d5 22 00 00 jne 0x2305 <-- trapping instruction 30: 49 8b 5c 24 08 mov 0x8(%r12),%rbx 35: e8 1c 2c da fa callq 0xfada2c56 3a: 31 ff xor %edi,%edi 3c: 89 c5 mov %eax,%ebp 3e: 89 c6 mov %eax,%esi