INFO: task syz-executor.2:25643 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28800 25643 25634 0x00000000 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 __lock_sock+0x13d/0x260 net/core/sock.c:2338 lock_sock_nested+0xf1/0x110 net/core/sock.c:2886 lock_sock include/net/sock.h:1512 [inline] ax25_recvmsg+0xbb/0x810 net/ax25/af_ax25.c:1629 sock_recvmsg_nosec net/socket.c:859 [inline] sock_recvmsg net/socket.c:866 [inline] sock_recvmsg+0xca/0x110 net/socket.c:862 ___sys_recvmsg+0x255/0x570 net/socket.c:2389 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 __sys_recvmsg net/socket.c:2438 [inline] __do_sys_recvmsg net/socket.c:2448 [inline] __se_sys_recvmsg net/socket.c:2445 [inline] __x64_sys_recvmsg+0x12f/0x220 net/socket.c:2445 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fb97ddd9af9 Code: Bad RIP value. RSP: 002b:00007fb97cd4f188 EFLAGS: 00000246 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 00007fb97deecf60 RCX: 00007fb97ddd9af9 RDX: 0000000000000000 RSI: 0000000020001940 RDI: 0000000000000006 RBP: 00007fb97de33ff7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffe6c20d0f R14: 00007fb97cd4f300 R15: 0000000000022000 Showing all locks held in the system: 5 locks held by kworker/0:0/5: #0: 0000000092fb6040 ((wq_completion)"usb_hub_wq"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000ce864a2a ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 00000000a5401cd9 (&dev->mutex){....}, at: device_lock include/linux/device.h:1174 [inline] #2: 00000000a5401cd9 (&dev->mutex){....}, at: hub_event+0x11e/0x44a0 drivers/usb/core/hub.c:5387 #3: 00000000d3a7c0f6 (&port_dev->status_lock){+.+.}, at: usb_lock_port drivers/usb/core/hub.c:2983 [inline] #3: 00000000d3a7c0f6 (&port_dev->status_lock){+.+.}, at: hub_port_connect drivers/usb/core/hub.c:5069 [inline] #3: 00000000d3a7c0f6 (&port_dev->status_lock){+.+.}, at: hub_port_connect_change drivers/usb/core/hub.c:5253 [inline] #3: 00000000d3a7c0f6 (&port_dev->status_lock){+.+.}, at: port_event drivers/usb/core/hub.c:5361 [inline] #3: 00000000d3a7c0f6 (&port_dev->status_lock){+.+.}, at: hub_event+0x1cb8/0x44a0 drivers/usb/core/hub.c:5441 #4: 00000000f01c5412 (hcd->address0_mutex){+.+.}, at: hub_port_init+0x1b9/0x3120 drivers/usb/core/hub.c:4578 4 locks held by kworker/u4:0/7: 5 locks held by kworker/1:0/19: #0: 0000000092fb6040 ((wq_completion)"usb_hub_wq"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 0000000005c99c08 ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 00000000930382da (&dev->mutex){....}, at: device_lock include/linux/device.h:1174 [inline] #2: 00000000930382da (&dev->mutex){....}, at: hub_event+0x11e/0x44a0 drivers/usb/core/hub.c:5387 #3: 00000000d08b42c4 (&port_dev->status_lock){+.+.}, at: usb_lock_port drivers/usb/core/hub.c:2983 [inline] #3: 00000000d08b42c4 (&port_dev->status_lock){+.+.}, at: hub_port_connect drivers/usb/core/hub.c:5069 [inline] #3: 00000000d08b42c4 (&port_dev->status_lock){+.+.}, at: hub_port_connect_change drivers/usb/core/hub.c:5253 [inline] #3: 00000000d08b42c4 (&port_dev->status_lock){+.+.}, at: port_event drivers/usb/core/hub.c:5361 [inline] #3: 00000000d08b42c4 (&port_dev->status_lock){+.+.}, at: hub_event+0x1cb8/0x44a0 drivers/usb/core/hub.c:5441 #4: 00000000ee39d607 (hcd->address0_mutex){+.+.}, at: hub_port_init+0x1b9/0x3120 drivers/usb/core/hub.c:4578 3 locks held by kworker/u4:1/23: 1 lock held by khungtaskd/1570: #0: 00000000eb3d3bf2 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 3 locks held by systemd-udevd/4696: #0: 00000000cf105d65 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #0: 00000000cf105d65 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 #1: 00000000eb3d3bf2 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline] #1: 00000000eb3d3bf2 (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857 #2: 00000000d0763c4c (kn->count#24){++++}, at: kernfs_seq_start+0x75/0x260 fs/kernfs/file.c:113 1 lock held by in:imklog/7822: #0: 0000000084cb1f74 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 1 lock held by syz-executor.2/12639: #0: 000000001f76632e (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #0: 000000001f76632e (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 1 lock held by syz-executor.2/24176: #0: 00000000d7a28ee1 (sk_lock-AF_AX25){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 00000000d7a28ee1 (sk_lock-AF_AX25){+.+.}, at: ax25_recvmsg+0xbb/0x810 net/ax25/af_ax25.c:1629 1 lock held by syz-executor.2/24278: #0: 00000000be91ad1e (sk_lock-AF_AX25){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 00000000be91ad1e (sk_lock-AF_AX25){+.+.}, at: ax25_recvmsg+0xbb/0x810 net/ax25/af_ax25.c:1629 1 lock held by syz-executor.2/25278: #0: 00000000e5e3a48a (sk_lock-AF_AX25){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 00000000e5e3a48a (sk_lock-AF_AX25){+.+.}, at: ax25_recvmsg+0xbb/0x810 net/ax25/af_ax25.c:1629 1 lock held by syz-executor.2/25518: #0: 00000000a233cccd (sk_lock-AF_AX25){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 00000000a233cccd (sk_lock-AF_AX25){+.+.}, at: ax25_recvmsg+0xbb/0x810 net/ax25/af_ax25.c:1629 1 lock held by syz-executor.2/25634: #0: 000000009064fdc2 (sk_lock-AF_AX25){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 000000009064fdc2 (sk_lock-AF_AX25){+.+.}, at: ax25_recvmsg+0xbb/0x810 net/ax25/af_ax25.c:1629 1 lock held by syz-executor.2/25810: #0: 000000004fb8adc0 (sk_lock-AF_AX25){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 000000004fb8adc0 (sk_lock-AF_AX25){+.+.}, at: ax25_recvmsg+0xbb/0x810 net/ax25/af_ax25.c:1629 1 lock held by syz-executor.2/26647: #0: 000000003a4c8ab8 (sk_lock-AF_AX25){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 000000003a4c8ab8 (sk_lock-AF_AX25){+.+.}, at: ax25_recvmsg+0xbb/0x810 net/ax25/af_ax25.c:1629 1 lock held by syz-executor.2/26689: #0: 00000000291afa3c (sk_lock-AF_AX25){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 00000000291afa3c (sk_lock-AF_AX25){+.+.}, at: ax25_recvmsg+0xbb/0x810 net/ax25/af_ax25.c:1629 1 lock held by syz-executor.2/26742: #0: 0000000018c759da (sk_lock-AF_AX25){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 0000000018c759da (sk_lock-AF_AX25){+.+.}, at: ax25_recvmsg+0xbb/0x810 net/ax25/af_ax25.c:1629 1 lock held by syz-executor.2/26902: #0: 00000000db15f1b7 (sk_lock-AF_AX25){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 00000000db15f1b7 (sk_lock-AF_AX25){+.+.}, at: ax25_recvmsg+0xbb/0x810 net/ax25/af_ax25.c:1629 1 lock held by syz-executor.2/27096: #0: 00000000d7d8b892 (sk_lock-AF_AX25){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 00000000d7d8b892 (sk_lock-AF_AX25){+.+.}, at: ax25_recvmsg+0xbb/0x810 net/ax25/af_ax25.c:1629 1 lock held by syz-executor.2/27870: #0: 000000002fed8e3d (sk_lock-AF_AX25){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 000000002fed8e3d (sk_lock-AF_AX25){+.+.}, at: ax25_recvmsg+0xbb/0x810 net/ax25/af_ax25.c:1629 1 lock held by syz-executor.2/28143: #0: 0000000059da503b (sk_lock-AF_AX25){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 0000000059da503b (sk_lock-AF_AX25){+.+.}, at: ax25_recvmsg+0xbb/0x810 net/ax25/af_ax25.c:1629 1 lock held by syz-executor.2/30931: #0: 000000000814bb42 (sk_lock-AF_AX25){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 000000000814bb42 (sk_lock-AF_AX25){+.+.}, at: ax25_recvmsg+0xbb/0x810 net/ax25/af_ax25.c:1629 1 lock held by syz-executor.2/31021: #0: 0000000060a46c38 (sk_lock-AF_AX25){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 0000000060a46c38 (sk_lock-AF_AX25){+.+.}, at: ax25_recvmsg+0xbb/0x810 net/ax25/af_ax25.c:1629 1 lock held by syz-executor.2/31155: #0: 000000007481f219 (sk_lock-AF_AX25){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 000000007481f219 (sk_lock-AF_AX25){+.+.}, at: ax25_recvmsg+0xbb/0x810 net/ax25/af_ax25.c:1629 1 lock held by syz-executor.2/31164: #0: 00000000f0693b5a (sk_lock-AF_AX25){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 00000000f0693b5a (sk_lock-AF_AX25){+.+.}, at: ax25_recvmsg+0xbb/0x810 net/ax25/af_ax25.c:1629 2 locks held by syz-executor.2/2668: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 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: 12639 Comm: syz-executor.2 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_const_cmp4+0x0/0x20 kernel/kcov.c:188 Code: 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c 24 0f b7 d6 0f b7 f7 bf 03 00 00 00 e9 ec fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 <48> 8b 0c 24 89 f2 89 fe bf 05 00 00 00 e9 ce fe ff ff 66 66 2e 0f RSP: 0018:ffff8880a581faf8 EFLAGS: 00000246 RAX: ffff88809fa9c500 RBX: 0000000000000000 RCX: ffffffff81386e24 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8880a581fd04 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8880964da300 R15: 0000000040000000 FS: 0000555556f23400(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f69d8cc8000 CR3: 00000000a7d45000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: wait_task_continued kernel/exit.c:1279 [inline] wait_consider_task+0xd39/0x3910 kernel/exit.c:1425 do_wait_thread kernel/exit.c:1442 [inline] do_wait+0x429/0x9c0 kernel/exit.c:1513 kernel_wait4+0x14c/0x260 kernel/exit.c:1655 __do_sys_wait4 kernel/exit.c:1667 [inline] __se_sys_wait4+0x149/0x160 kernel/exit.c:1663 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fb97ddd7f97 Code: 89 7c 24 10 48 89 4c 24 18 e8 35 50 02 00 4c 8b 54 24 18 8b 54 24 14 41 89 c0 48 8b 74 24 08 8b 7c 24 10 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 89 44 24 10 e8 65 50 02 00 8b 44 RSP: 002b:00007fffe6c20f30 EFLAGS: 00000293 ORIG_RAX: 000000000000003d RAX: ffffffffffffffda RBX: 0000000000000dc7 RCX: 00007fb97ddd7f97 RDX: 0000000040000001 RSI: 00007fffe6c20fbc RDI: 00000000ffffffff RBP: 00007fffe6c20fbc R08: 0000000000000000 R09: 000000bd14d23157 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032 R13: 00000000000b2ed7 R14: 0000000000000009 R15: 00007fffe6c21020 ---------------- Code disassembly (best guess): 0: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 7: 00 00 00 a: 48 8b 0c 24 mov (%rsp),%rcx e: 0f b7 d6 movzwl %si,%edx 11: 0f b7 f7 movzwl %di,%esi 14: bf 03 00 00 00 mov $0x3,%edi 19: e9 ec fe ff ff jmpq 0xffffff0a 1e: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) 25: 00 00 00 00 29: 90 nop * 2a: 48 8b 0c 24 mov (%rsp),%rcx <-- trapping instruction 2e: 89 f2 mov %esi,%edx 30: 89 fe mov %edi,%esi 32: bf 05 00 00 00 mov $0x5,%edi 37: e9 ce fe ff ff jmpq 0xffffff0a 3c: 66 data16 3d: 66 data16 3e: 2e cs 3f: 0f .byte 0xf