watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.3:530] Modules linked in: irq event stamp: 4110585 hardirqs last enabled at (4110584): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (4110585): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (5664): [] rcu_read_unlock_bh include/linux/rcupdate.h:717 [inline] softirqs last enabled at (5664): [] __dev_queue_xmit+0x15f5/0x2e00 net/core/dev.c:3865 softirqs last disabled at (5728): [] __dev_queue_xmit+0x1e2/0x2e00 net/core/dev.c:3773 CPU: 0 PID: 530 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:cake_heapify+0x2cd/0x340 net/sched/sch_cake.c:1407 Code: e8 08 27 ca fa 44 0f b7 6c 24 06 89 ee 44 89 ef e8 e8 27 ca fa 41 39 ed 0f 85 45 fe ff ff 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e <41> 5f e9 dc 26 ca fa e8 37 03 00 fb e9 fc fd ff ff e8 9d 02 00 fb RSP: 0018:ffff8880972ff670 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffff888050677940 RCX: ffffffff86985e78 RDX: 00000000000008de RSI: ffff888039d48140 RDI: 0000000000000004 RBP: dffffc0000000000 R08: ffffffff8c665018 R09: 00000000000008de R10: 0000000000000004 R11: ffffffff8c66501b R12: 00000000000008dd R13: 0000000000000900 R14: ffff888026803340 R15: dffffc0000000000 FS: 00007fee1330f700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c00caaf860 CR3: 0000000043174000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: cake_drop net/sched/sch_cake.c:1472 [inline] cake_enqueue+0x1296/0x33d0 net/sched/sch_cake.c:1848 __dev_xmit_skb net/core/dev.c:3494 [inline] __dev_queue_xmit+0x140a/0x2e00 net/core/dev.c:3807 __netlink_deliver_tap_skb net/netlink/af_netlink.c:303 [inline] __netlink_deliver_tap net/netlink/af_netlink.c:321 [inline] netlink_deliver_tap+0x8fb/0xb00 net/netlink/af_netlink.c:334 netlink_deliver_tap_kernel net/netlink/af_netlink.c:343 [inline] netlink_unicast_kernel net/netlink/af_netlink.c:1324 [inline] netlink_unicast+0x545/0x690 net/netlink/af_netlink.c:1351 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2227 __sys_sendmsg net/socket.c:2265 [inline] __do_sys_sendmsg net/socket.c:2274 [inline] __se_sys_sendmsg net/socket.c:2272 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2272 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fee1499a049 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fee1330f168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fee14aacf60 RCX: 00007fee1499a049 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000054 RBP: 00007fee149f408d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe314ac41f R14: 00007fee1330f300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60 ---------------- Code disassembly (best guess): 0: e8 08 27 ca fa callq 0xfaca270d 5: 44 0f b7 6c 24 06 movzwl 0x6(%rsp),%r13d b: 89 ee mov %ebp,%esi d: 44 89 ef mov %r13d,%edi 10: e8 e8 27 ca fa callq 0xfaca27fd 15: 41 39 ed cmp %ebp,%r13d 18: 0f 85 45 fe ff ff jne 0xfffffe63 1e: 48 83 c4 18 add $0x18,%rsp 22: 5b pop %rbx 23: 5d pop %rbp 24: 41 5c pop %r12 26: 41 5d pop %r13 28: 41 5e pop %r14 * 2a: 41 5f pop %r15 <-- trapping instruction 2c: e9 dc 26 ca fa jmpq 0xfaca270d 31: e8 37 03 00 fb callq 0xfb00036d 36: e9 fc fd ff ff jmpq 0xfffffe37 3b: e8 9d 02 00 fb callq 0xfb0002dd