watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.5:26535] Modules linked in: irq event stamp: 252479 hardirqs last enabled at (252478): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (252478): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (252478): [] ktime_get+0x235/0x2f0 kernel/time/timekeeping.c:756 hardirqs last disabled at (252479): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (272): [] netlink_insert+0x156/0x11d0 net/netlink/af_netlink.c:608 softirqs last disabled at (280): [] __dev_queue_xmit+0x1e2/0x2e00 net/core/dev.c:3773 CPU: 0 PID: 26535 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x2e/0x50 kernel/kcov.c:107 Code: 65 48 8b 04 25 c0 df 01 00 65 8b 15 cc 59 9f 7e 81 e2 00 01 1f 00 75 2b 8b 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 RSP: 0018:ffff888049cbf628 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff88804d822180 RBX: 00000000000004e4 RCX: ffffc9000c649000 RDX: 0000000000000002 RSI: ffffffff86985be3 RDI: ffff88801c5457c0 RBP: 00000000000004e4 R08: ffffffff8c665018 R09: 00000000ffffffff R10: 0000000000000005 R11: ffffffff8c66501b R12: ffff88801c5457c0 R13: 0000000000000300 R14: ffff888019602bc0 R15: ffff88801c545540 FS: 00007fb1c54a5700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f254db96028 CR3: 0000000052f17000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: cake_heapify+0x23/0x340 net/sched/sch_cake.c:1375 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: 0033:0x7fb1c6b2ffe9 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:00007fb1c54a5168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb1c6c42f60 RCX: 00007fb1c6b2ffe9 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000006 RBP: 00007fb1c6b8a08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdb3822c1f R14: 00007fb1c54a5300 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: 65 48 8b 04 25 c0 df mov %gs:0x1dfc0,%rax 7: 01 00 9: 65 8b 15 cc 59 9f 7e mov %gs:0x7e9f59cc(%rip),%edx # 0x7e9f59dc 10: 81 e2 00 01 1f 00 and $0x1f0100,%edx 16: 75 2b jne 0x43 18: 8b 90 60 13 00 00 mov 0x1360(%rax),%edx 1e: 83 fa 02 cmp $0x2,%edx 21: 75 20 jne 0x43 23: 48 8b 88 68 13 00 00 mov 0x1368(%rax),%rcx * 2a: 8b 80 64 13 00 00 mov 0x1364(%rax),%eax <-- trapping instruction 30: 48 8b 11 mov (%rcx),%rdx 33: 48 83 c2 01 add $0x1,%rdx 37: 48 39 d0 cmp %rdx,%rax 3a: 76 07 jbe 0x43 3c: 48 89 34 d1 mov %rsi,(%rcx,%rdx,8)