watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [startpar:4089] Modules linked in: irq event stamp: 14770 hardirqs last enabled at (14769): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:585 hardirqs last disabled at (14770): [] idtentry_enter_cond_rcu+0x1d/0x50 arch/x86/entry/common.c:649 softirqs last enabled at (10120): [] __do_softirq+0x748/0xa60 kernel/softirq.c:319 softirqs last disabled at (10111): [] asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711 CPU: 0 PID: 4089 Comm: startpar Not tainted 5.8.0-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline] RIP: 0010:smp_call_function_many_cond+0x7c4/0x990 kernel/smp.c:555 Code: 0a 00 85 ed 74 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 f4 4c 89 f5 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 7e f3 0a 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 a2 00 00 00 8b 43 08 31 RSP: 0018:ffffc900220f7980 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff88802d139d40 RCX: ffffffff8168c9b8 RDX: ffff88802701d0c0 RSI: ffffffff8168c992 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffed1005a273a9 R13: 0000000000000003 R14: ffff88802d139d48 R15: 0000000000000001 FS: 00007f7d7340e700(0000) GS:ffff88802ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcb734dfa8 CR3: 0000000023054000 CR4: 0000000000340ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __flush_tlb_others arch/x86/include/asm/paravirt.h:74 [inline] flush_tlb_others arch/x86/mm/tlb.c:856 [inline] flush_tlb_mm_range+0x295/0x4d0 arch/x86/mm/tlb.c:943 dup_mmap kernel/fork.c:621 [inline] dup_mm+0xd58/0x1300 kernel/fork.c:1371 copy_mm kernel/fork.c:1427 [inline] copy_process+0x2aa2/0x6d90 kernel/fork.c:2098 _do_fork+0x12c/0xa70 kernel/fork.c:2443 __do_sys_clone+0xef/0x150 kernel/fork.c:2599 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f7d72f17f46 Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 14 25 10 00 00 00 31 d2 49 81 c2 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 31 01 00 00 85 c0 41 89 c4 0f 85 3b 01 00 RSP: 002b:00007ffcb7350070 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffcb7350070 RCX: 00007f7d72f17f46 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffcb73500b0 R08: 0000000000000000 R09: 0000000000000000 R10: 00007f7d7340e9d0 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000002048 R15: 000000005f27dd2a