watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [kworker/u4:9:11174] Modules linked in: irq event stamp: 269545 hardirqs last enabled at (269544): [] kvm_wait arch/x86/kernel/kvm.c:799 [inline] hardirqs last enabled at (269544): [] kvm_wait+0x14b/0x240 arch/x86/kernel/kvm.c:779 hardirqs last disabled at (269545): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (259142): [] spin_unlock_bh include/linux/spinlock.h:374 [inline] softirqs last enabled at (259142): [] tipc_conn_kref_release net/tipc/topsrv.c:149 [inline] softirqs last enabled at (259142): [] kref_put include/linux/kref.h:70 [inline] softirqs last enabled at (259142): [] conn_put+0x2c5/0x3a0 net/tipc/topsrv.c:155 softirqs last disabled at (259148): [] spin_lock_bh include/linux/spinlock.h:334 [inline] softirqs last disabled at (259148): [] tipc_conn_kref_release net/tipc/topsrv.c:137 [inline] softirqs last disabled at (259148): [] kref_put include/linux/kref.h:70 [inline] softirqs last disabled at (259148): [] conn_put+0x7a/0x3a0 net/tipc/topsrv.c:155 CPU: 0 PID: 11174 Comm: kworker/u4:9 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: tipc_rcv tipc_conn_recv_work RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61 Code: 48 89 df e8 f4 20 7f f9 e9 2e ff ff ff 48 89 df e8 e7 20 7f f9 eb 82 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 14 43 4e 00 fb f4 90 e9 07 00 00 00 0f 00 2d 04 43 4e 00 f4 c3 90 90 41 56 41 55 RSP: 0018:ffff88804ebc7bb8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3054 RBX: ffff88809d424110 RCX: 1ffff11009d71167 RDX: dffffc0000000000 RSI: ffff88804eb88b18 RDI: ffff88804eb88ac4 RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286 R13: ffffed1013a84822 R14: 0000000000000001 R15: ffff8880ba02be00 FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd9b7fcb47 CR3: 00000000a93ae000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] kvm_wait arch/x86/kernel/kvm.c:799 [inline] kvm_wait+0x179/0x240 arch/x86/kernel/kvm.c:779 pv_wait arch/x86/include/asm/paravirt.h:689 [inline] pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:471 [inline] __pv_queued_spin_lock_slowpath+0x86a/0xae0 kernel/locking/qspinlock.c:474 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:679 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:53 [inline] queued_spin_lock include/asm-generic/qspinlock.h:88 [inline] do_raw_spin_lock+0x189/0x220 kernel/locking/spinlock_debug.c:113 spin_lock_bh include/linux/spinlock.h:334 [inline] tipc_conn_kref_release net/tipc/topsrv.c:137 [inline] kref_put include/linux/kref.h:70 [inline] conn_put+0x7a/0x3a0 net/tipc/topsrv.c:155 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 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 279 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: netns cleanup_net RIP: 0010:__sanitizer_cov_trace_pc+0x47/0x50 kernel/kcov.c:111 Code: 90 60 13 00 00 83 fa 02 75 20 48 8b 88 68 13 00 00 8b 80 64 13 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 0f 1f 84 00 00 00 00 00 49 89 f1 49 89 fa 65 48 8b 34 25 c0 df RSP: 0018:ffff8880b49c7b60 EFLAGS: 00000293 RAX: ffff8880b4db8300 RBX: 000000002b764866 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff87eef291 RDI: ffff88809d4240c0 RBP: ffff88809d4240c0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000040 R13: ffffed1013a84829 R14: dffffc0000000000 R15: 000000000000015d FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f82f0a91058 CR3: 00000000957d1000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __read_once_size include/linux/compiler.h:263 [inline] radix_tree_load_root lib/radix-tree.c:603 [inline] __radix_tree_lookup+0x51/0x370 lib/radix-tree.c:1040 tipc_topsrv_stop net/tipc/topsrv.c:698 [inline] tipc_topsrv_exit_net+0x25e/0x5c0 net/tipc/topsrv.c:722 ops_exit_list+0xa5/0x150 net/core/net_namespace.c:153 cleanup_net+0x3b4/0x8b0 net/core/net_namespace.c:554 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: 48 89 df mov %rbx,%rdi 3: e8 f4 20 7f f9 callq 0xf97f20fc 8: e9 2e ff ff ff jmpq 0xffffff3b d: 48 89 df mov %rbx,%rdi 10: e8 e7 20 7f f9 callq 0xf97f20fc 15: eb 82 jmp 0xffffff99 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: e9 07 00 00 00 jmpq 0x28 21: 0f 00 2d 14 43 4e 00 verw 0x4e4314(%rip) # 0x4e433c 28: fb sti 29: f4 hlt * 2a: c3 retq <-- trapping instruction 2b: 90 nop 2c: e9 07 00 00 00 jmpq 0x38 31: 0f 00 2d 04 43 4e 00 verw 0x4e4304(%rip) # 0x4e433c 38: f4 hlt 39: c3 retq 3a: 90 nop 3b: 90 nop 3c: 41 56 push %r14 3e: 41 55 push %r13