watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [kworker/0:3:2477] Modules linked in: irq event stamp: 7673380 hardirqs last enabled at (7673379): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596 hardirqs last disabled at (7673380): [] idtentry_enter_cond_rcu+0x1d/0x50 arch/x86/entry/common.c:607 softirqs last enabled at (7673042): [] __do_softirq+0x748/0xa60 kernel/softirq.c:319 softirqs last disabled at (7673033): [] asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711 CPU: 0 PID: 2477 Comm: kworker/0:3 Not tainted 5.8.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events fqdir_work_fn RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline] RIP: 0010:smp_call_function_single+0x192/0x4f0 kernel/smp.c:382 Code: 10 8b 7c 24 1c 48 8d 74 24 40 48 89 44 24 50 48 8b 44 24 08 48 89 44 24 58 e8 fa f9 ff ff 41 89 c5 eb 07 e8 f0 ff 0a 00 f3 90 <44> 8b 64 24 48 31 ff 41 83 e4 01 44 89 e6 e8 5b fc 0a 00 45 85 e4 RSP: 0018:ffffc90007cf7bc0 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 1ffff92000f9ef7c RCX: ffffffff8168b785 RDX: ffff8880a0128180 RSI: ffffffff8168b770 RDI: 0000000000000005 RBP: ffffc90007cf7c90 R08: 0000000000000001 R09: ffff8880ae736dc7 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880ae736c00 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff819aaf740 CR3: 0000000093d74000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_barrier+0x29c/0x4a0 kernel/rcu/tree.c:3635 fqdir_work_fn+0x5d/0xf0 net/ipv4/inet_fragment.c:159 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 21870 Comm: syz-executor.4 Not tainted 5.8.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:write_comp_data+0x13/0x80 kernel/kcov.c:218 Code: 48 8b 80 f8 13 00 00 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 49 89 f2 65 8b 05 16 4c 8e 7e 65 48 8b 34 25 00 ff 01 00 00 01 ff 00 74 0f f6 c4 01 74 59 8b 86 04 14 00 00 85 c0 74 4f RSP: 0018:ffffc90000da8d70 EFLAGS: 00000046 RAX: 0000000080010002 RBX: ffff8880909ff340 RCX: ffffffff8661f5d3 RDX: 0000000000000001 RSI: ffff8880956221c0 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000003 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ae727740 R13: ffff888087537000 R14: ffff8880909ff340 R15: dffffc0000000000 FS: 00007f4e9fb7e700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000788060 CR3: 00000000444ed000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: advance_sched+0x643/0x990 net/sched/sch_taprio.c:702 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x6a9/0xfc0 kernel/time/hrtimer.c:1584 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] sysvec_apic_timer_interrupt+0xe0/0x120 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:765 [inline] RIP: 0010:on_each_cpu+0x149/0x240 kernel/smp.c:702 Code: 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 e6 00 00 00 48 83 3d 57 12 4c 08 00 0f 84 af 00 00 00 e8 6c e9 0a 00 48 89 df 57 9d <0f> 1f 44 00 00 e8 5d e9 0a 00 bf 01 00 00 00 e8 83 a4 e6 ff 31 ff RSP: 0018:ffffc900020efd70 EFLAGS: 00000212 RAX: 0000000000000225 RBX: 0000000000000212 RCX: ffffc90011ad6000 RDX: 0000000000040000 RSI: ffffffff8168cdf4 RDI: 0000000000000212 RBP: 0000000000000200 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffc900020efed0 R15: ffffffffa0fa4cc6 clock_was_set+0x18/0x20 kernel/time/hrtimer.c:872 do_settimeofday64 kernel/time/timekeeping.c:1257 [inline] do_settimeofday64+0x350/0x4e0 kernel/time/timekeeping.c:1223 do_sys_settimeofday64 kernel/time/time.c:195 [inline] do_sys_settimeofday64+0x1de/0x260 kernel/time/time.c:169 __do_sys_clock_settime kernel/time/posix-timers.c:1079 [inline] __se_sys_clock_settime kernel/time/posix-timers.c:1067 [inline] __x64_sys_clock_settime+0x197/0x260 kernel/time/posix-timers.c:1067 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cb29 Code: Bad RIP value. RSP: 002b:00007f4e9fb7dc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3 RAX: ffffffffffffffda RBX: 00000000004db560 RCX: 000000000045cb29 RDX: 0000000000000000 RSI: 0000000020000400 RDI: 0000000000000000 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000007b R14: 00000000004c34ac R15: 00007f4e9fb7e6d4