netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'. INFO: task syz-executor2:21431 blocked for more than 140 seconds. Not tainted 5.0.0-rc4+ #37 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D25368 21431 7918 0x00000004 Call Trace: context_switch kernel/sched/core.c:2844 [inline] __schedule+0x897/0x1e60 kernel/sched/core.c:3485 schedule+0xfe/0x350 kernel/sched/core.c:3529 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3587 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xa3b/0x1670 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 genl_lock net/netlink/genetlink.c:33 [inline] ctrl_getfamily+0x30d/0x420 net/netlink/genetlink.c:873 genl_family_rcv_msg+0x80d/0x11a0 net/netlink/genetlink.c:601 genl_rcv_msg+0xca/0x16c net/netlink/genetlink.c:626 netlink_rcv_skb+0x17d/0x410 net/netlink/af_netlink.c:2485 genl_rcv+0x29/0x40 net/netlink/genetlink.c:637 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x574/0x770 net/netlink/af_netlink.c:1336 netlink_sendmsg+0xa05/0xf90 net/netlink/af_netlink.c:1925 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 ___sys_sendmsg+0x7ec/0x910 net/socket.c:2116 __sys_sendmsg+0x112/0x270 net/socket.c:2154 __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg net/socket.c:2161 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x411f71 Code: 03 50 1c 41 00 e9 fd fe ff ff bf cd 30 44 00 b9 0a 00 00 00 48 89 ee f3 a6 75 0c 48 c7 03 70 1c 41 00 e9 e0 fe ff ff be 2c 37 <44> 00 48 89 ef e8 55 94 ff ff 85 c0 75 0c 48 c7 03 80 1c 41 00 e9 RSP: 002b:00007f122cb149c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000411f71 RDX: 0000000000000000 RSI: 00007f122cb14a00 RDI: 0000000000000004 RBP: 0000000000000004 R08: 00007f122cb149d0 R09: 000000000073bf00 R10: 00007f122cb159d0 R11: 0000000000000293 R12: 00007f122cb14a40 R13: 00000000004cd8b0 R14: 00000000004dbaa0 R15: 00000000ffffffff INFO: task syz-executor2:21436 blocked for more than 140 seconds. Not tainted 5.0.0-rc4+ #37 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D25256 21436 7918 0x00000004 Call Trace: context_switch kernel/sched/core.c:2844 [inline] __schedule+0x897/0x1e60 kernel/sched/core.c:3485 schedule+0xfe/0x350 kernel/sched/core.c:3529 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3587 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xa3b/0x1670 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x13e/0x16c net/netlink/genetlink.c:624 netlink_rcv_skb+0x17d/0x410 net/netlink/af_netlink.c:2485 genl_rcv+0x29/0x40 net/netlink/genetlink.c:637 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x574/0x770 net/netlink/af_netlink.c:1336 netlink_sendmsg+0xa05/0xf90 net/netlink/af_netlink.c:1925 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 ___sys_sendmsg+0x7ec/0x910 net/socket.c:2116 __sys_sendmsg+0x112/0x270 net/socket.c:2154 __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg net/socket.c:2161 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x411f71 Code: a8 00 00 00 48 89 44 24 18 48 89 74 24 20 48 89 54 24 28 48 8b 84 24 c0 00 00 00 48 89 44 24 30 48 89 4c 24 38 e8 bf 10 ff ff <48> 8b 4c 24 40 e9 d0 fe ff ff 48 c7 84 24 c8 00 00 00 00 00 00 00 RSP: 002b:00007f122caf39c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000411f71 RDX: 0000000000000000 RSI: 00007f122caf3a00 RDI: 0000000000000005 RBP: 0000000000000005 R08: 00007f122caf39d0 R09: 000000000073bfa0 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f122caf3a40 R13: 00000000004cd8b0 R14: 00000000004dbaa0 R15: 00000000ffffffff INFO: task syz-executor5:21463 blocked for more than 140 seconds. Not tainted 5.0.0-rc4+ #37 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D26904 21463 7931 0x00000004 Call Trace: context_switch kernel/sched/core.c:2844 [inline] __schedule+0x897/0x1e60 kernel/sched/core.c:3485 schedule+0xfe/0x350 kernel/sched/core.c:3529 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3587 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xa3b/0x1670 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x13e/0x16c net/netlink/genetlink.c:624 netlink_rcv_skb+0x17d/0x410 net/netlink/af_netlink.c:2485 genl_rcv+0x29/0x40 net/netlink/genetlink.c:637 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x574/0x770 net/netlink/af_netlink.c:1336 netlink_sendmsg+0xa05/0xf90 net/netlink/af_netlink.c:1925 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 ___sys_sendmsg+0x7ec/0x910 net/socket.c:2116 __sys_sendmsg+0x112/0x270 net/socket.c:2154 __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg net/socket.c:2161 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458089 Code: 8b 4b 10 4c 8b 53 08 48 8b 1b 49 39 ca 0f 87 23 01 00 00 48 89 74 24 38 48 89 7c 24 30 4c 89 44 24 28 44 88 4c 24 27 48 89 54 <24> 50 48 89 44 24 40 48 c7 80 f8 00 00 00 00 00 00 00 4c 89 90 00 RSP: 002b:00007f8208093c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458089 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f82080946d4 R13: 00000000004c563f R14: 00000000004d93a0 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1041: #0: 00000000a8c68658 (rcu_read_lock){....}, at: debug_show_all_locks+0xc6/0x41d kernel/locking/lockdep.c:4389 1 lock held by rsyslogd/7789: #0: 00000000592b9947 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1b3/0x1f0 fs/file.c:795 2 locks held by getty/7879: #0: 0000000030ca5d7c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000004306e369 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/7880: #0: 00000000f59f7c57 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000077ca210e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/7881: #0: 00000000ceab3913 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000973a57f7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/7882: #0: 000000009725c184 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000007f3add2d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/7883: #0: 0000000012c2469e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000a7ae44fe (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/7884: #0: 000000002a4b2d47 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000770463ce (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/7885: #0: 00000000f8d7316c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000070e5b1d4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by syz-executor2/21431: #0: 000000007ba0a084 (cb_lock){++++}, at: ctrl_getfamily+0x2ff/0x420 net/netlink/genetlink.c:872 #1: 0000000084c079c6 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 0000000084c079c6 (genl_mutex){+.+.}, at: ctrl_getfamily+0x30d/0x420 net/netlink/genetlink.c:873 2 locks held by syz-executor2/21436: #0: 000000007ba0a084 (cb_lock){++++}, at: genl_rcv+0x1a/0x40 net/netlink/genetlink.c:636 #1: 0000000084c079c6 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 0000000084c079c6 (genl_mutex){+.+.}, at: genl_rcv_msg+0x13e/0x16c net/netlink/genetlink.c:624 2 locks held by syz-executor3/21433: 2 locks held by syz-executor5/21463: #0: 000000007ba0a084 (cb_lock){++++}, at: genl_rcv+0x1a/0x40 net/netlink/genetlink.c:636 #1: 0000000084c079c6 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 0000000084c079c6 (genl_mutex){+.+.}, at: genl_rcv_msg+0x13e/0x16c net/netlink/genetlink.c:624 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1041 Comm: khungtaskd Not tainted 5.0.0-rc4+ #37 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+0x1db/0x2d0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0xbbb/0x1170 kernel/hung_task.c:287 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.698 msecs NMI backtrace for cpu 1 CPU: 1 PID: 21433 Comm: syz-executor3 Not tainted 5.0.0-rc4+ #37 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:separate_irq_context kernel/locking/lockdep.c:2975 [inline] RIP: 0010:__lock_acquire+0x647/0x4a30 kernel/locking/lockdep.c:3329 Code: 00 48 8b 94 24 80 00 00 00 4d 89 2a 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e b7 2e 00 00 <41> 8b 84 24 78 08 00 00 85 c0 0f 85 4d 05 00 00 4c 89 ea 44 89 e8 RSP: 0018:ffff8880965fe700 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 000000000000002b RCX: 1ffff1100c97e946 RDX: 1ffff1100c97e937 RSI: 0000000000000000 RDI: ffffffff8b0abd30 RBP: ffff8880965fe990 R08: 0000000000000002 R09: ffff888064bf4a30 R10: ffff888064bf4a10 R11: 0000000000000000 R12: ffff888064bf4140 R13: bea9bcdb9ceb993a R14: 0000000000000000 R15: 000000000000002b FS: 00007fd74f871700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000907c3000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841 rcu_lock_acquire include/linux/rcupdate.h:223 [inline] rcu_read_lock include/linux/rcupdate.h:607 [inline] net_generic include/net/netns/generic.h:44 [inline] tipc_sk_lookup+0x102/0xf80 net/tipc/socket.c:2783 tipc_nl_publ_dump+0x209/0xf40 net/tipc/socket.c:3591 __tipc_nl_compat_dumpit.isra.0+0x261/0xa80 net/tipc/netlink_compat.c:206 tipc_nl_compat_publ_dump net/tipc/netlink_compat.c:977 [inline] tipc_nl_compat_sk_dump+0x6ac/0xd40 net/tipc/netlink_compat.c:1028 __tipc_nl_compat_dumpit.isra.0+0x383/0xa80 net/tipc/netlink_compat.c:215 tipc_nl_compat_dumpit+0x1f4/0x440 net/tipc/netlink_compat.c:280 tipc_nl_compat_handle net/tipc/netlink_compat.c:1202 [inline] tipc_nl_compat_recv+0xec0/0x18b0 net/tipc/netlink_compat.c:1265 genl_family_rcv_msg+0x80d/0x11a0 net/netlink/genetlink.c:601 genl_rcv_msg+0xca/0x16c net/netlink/genetlink.c:626 netlink_rcv_skb+0x17d/0x410 net/netlink/af_netlink.c:2485 genl_rcv+0x29/0x40 net/netlink/genetlink.c:637 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x574/0x770 net/netlink/af_netlink.c:1336 netlink_sendmsg+0xa05/0xf90 net/netlink/af_netlink.c:1925 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 ___sys_sendmsg+0x7ec/0x910 net/socket.c:2116 __sys_sendmsg+0x112/0x270 net/socket.c:2154 __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg net/socket.c:2161 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458089 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd74f870c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458089 RDX: 0000000000000000 RSI: 0000000020000500 RDI: 0000000000000006 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd74f8716d4 R13: 00000000004cbab0 R14: 00000000004d9088 R15: 00000000ffffffff