INFO: task syz-executor.3:15891 blocked for more than 143 seconds. Not tainted 5.1.0-rc6+ #163 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D27368 15891 7608 0x00000004 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x813/0x1cc0 kernel/sched/core.c:3518 schedule+0x92/0x180 kernel/sched/core.c:3562 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3620 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1310 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:897 genl_family_rcv_msg+0x753/0xf80 net/netlink/genetlink.c:625 genl_rcv_msg+0xca/0x16c net/netlink/genetlink.c:650 netlink_rcv_skb+0x17a/0x460 net/netlink/af_netlink.c:2486 genl_rcv+0x29/0x40 net/netlink/genetlink.c:661 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x536/0x720 net/netlink/af_netlink.c:1337 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1926 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:661 ___sys_sendmsg+0x806/0x930 net/socket.c:2280 __sys_sendmsg+0x105/0x1d0 net/socket.c:2318 __do_sys_sendmsg net/socket.c:2327 [inline] __se_sys_sendmsg net/socket.c:2325 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2325 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x412c81 Code: 00 31 c0 e8 d1 e3 00 00 e9 ba fd ff ff 0f 1f 40 00 48 8b bb c8 00 00 00 ff 15 db 6a 24 00 85 c0 89 c5 0f 85 0d fe ff ff e9 4d ff ff 0f 1f 40 00 b8 01 00 00 00 f0 48 0f c1 05 12 aa 24 00 48 RSP: 002b:00007f0a450249c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000412c81 RDX: 0000000000000000 RSI: 00007f0a45024a00 RDI: 0000000000000005 RBP: 0000000000000005 R08: 00007f0a450249d0 R09: 000000000073bfa0 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f0a45024a40 R13: 00000000004cef20 R14: 00000000004dd6a0 R15: 00000000ffffffff INFO: task syz-executor.3:15899 blocked for more than 143 seconds. Not tainted 5.1.0-rc6+ #163 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28656 15899 7608 0x00000004 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x813/0x1cc0 kernel/sched/core.c:3518 schedule+0x92/0x180 kernel/sched/core.c:3562 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3620 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1310 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:648 netlink_rcv_skb+0x17a/0x460 net/netlink/af_netlink.c:2486 genl_rcv+0x29/0x40 net/netlink/genetlink.c:661 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x536/0x720 net/netlink/af_netlink.c:1337 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1926 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:661 ___sys_sendmsg+0x806/0x930 net/socket.c:2280 __sys_sendmsg+0x105/0x1d0 net/socket.c:2318 __do_sys_sendmsg net/socket.c:2327 [inline] __se_sys_sendmsg net/socket.c:2325 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2325 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x412c81 Code: 00 31 c0 e8 d1 e3 00 00 e9 ba fd ff ff 0f 1f 40 00 48 8b bb c8 00 00 00 ff 15 db 6a 24 00 85 c0 89 c5 0f 85 0d fe ff ff e9 4d ff ff 0f 1f 40 00 b8 01 00 00 00 f0 48 0f c1 05 12 aa 24 00 48 RSP: 002b:00007f0a450039c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000412c81 RDX: 0000000000000000 RSI: 00007f0a45003a00 RDI: 0000000000000009 RBP: 0000000000000009 R08: 00007f0a450039d0 R09: 000000000073c040 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f0a45003a40 R13: 00000000004cefe0 R14: 00000000004dd718 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1042: #0: 000000001ca11dd0 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5057 1 lock held by rsyslogd/7472: #0: 000000000c255f50 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/7563: #0: 000000001ca81ecb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000064ac0937 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7564: #0: 00000000b04d4a55 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000001d0ae8b5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7565: #0: 0000000035c1db53 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000000cf6aa9c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7566: #0: 000000004195b443 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000033018a98 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7567: #0: 000000009b89462c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000001bf3046f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7568: #0: 000000008129cfb3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000c6d7abc3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7569: #0: 000000008381deb1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000302a264a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.3/15891: #0: 0000000084892ef0 (cb_lock){++++}, at: ctrl_getfamily+0x2ff/0x420 net/netlink/genetlink.c:896 #1: 000000001e63e215 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000001e63e215 (genl_mutex){+.+.}, at: ctrl_getfamily+0x30d/0x420 net/netlink/genetlink.c:897 2 locks held by syz-executor.3/15899: #0: 0000000084892ef0 (cb_lock){++++}, at: genl_rcv+0x1a/0x40 net/netlink/genetlink.c:660 #1: 000000001e63e215 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 000000001e63e215 (genl_mutex){+.+.}, at: genl_rcv_msg+0x13e/0x16c net/netlink/genetlink.c:648 2 locks held by syz-executor.0/15927: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc6+ #163 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+0x172/0x1f0 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:204 [inline] watchdog+0x9b7/0xec0 kernel/hung_task.c:288 kthread+0x357/0x430 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 15927 Comm: syz-executor.0 Not tainted 5.1.0-rc6+ #163 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x20d/0x3fb0 kernel/locking/lockdep.c:3613 Code: 49 c1 e9 03 41 0f b6 34 31 40 84 f6 74 0a 40 80 fe 03 0f 8e f2 2b 00 00 0f b7 70 20 81 e6 ff 1f 00 00 44 39 c6 75 09 48 85 db <0f> 85 a6 0b 00 00 4c 03 95 40 ff ff ff 44 89 c6 66 81 e6 ff 1f 49 RSP: 0018:ffff88806043eb70 EFLAGS: 00000046 RAX: ffff8880610d2c50 RBX: 0000000000000000 RCX: 0000000000000002 RDX: 0000000000000001 RSI: 000000000000002b RDI: ffff8880610d2c70 RBP: ffff88806043eca8 R08: 000000000000002b R09: 1ffff1100c21a58e R10: 0000000000000078 R11: ffff8880610d2380 R12: 0000000000000000 R13: ffffffff889a5bc0 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f1e13088700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 0000000091ad7000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4211 rcu_lock_acquire include/linux/rcupdate.h:210 [inline] rcu_read_lock include/linux/rcupdate.h:595 [inline] rhashtable_lookup_fast include/linux/rhashtable.h:664 [inline] tipc_sk_lookup+0x27c/0xc10 net/tipc/socket.c:2808 tipc_nl_publ_dump+0x1f8/0xd70 net/tipc/socket.c:3617 __tipc_nl_compat_dumpit.isra.0+0x220/0x930 net/tipc/netlink_compat.c:206 tipc_nl_compat_publ_dump net/tipc/netlink_compat.c:997 [inline] tipc_nl_compat_sk_dump+0x54d/0x970 net/tipc/netlink_compat.c:1049 __tipc_nl_compat_dumpit.isra.0+0x32c/0x930 net/tipc/netlink_compat.c:215 tipc_nl_compat_dumpit+0x209/0x4d0 net/tipc/netlink_compat.c:286 tipc_nl_compat_handle net/tipc/netlink_compat.c:1248 [inline] tipc_nl_compat_recv+0x34f/0xb30 net/tipc/netlink_compat.c:1286 genl_family_rcv_msg+0x753/0xf80 net/netlink/genetlink.c:625 genl_rcv_msg+0xca/0x16c net/netlink/genetlink.c:650 netlink_rcv_skb+0x17a/0x460 net/netlink/af_netlink.c:2486 genl_rcv+0x29/0x40 net/netlink/genetlink.c:661 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x536/0x720 net/netlink/af_netlink.c:1337 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1926 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:661 ___sys_sendmsg+0x806/0x930 net/socket.c:2280 __sys_sendmsg+0x105/0x1d0 net/socket.c:2318 __do_sys_sendmsg net/socket.c:2327 [inline] __se_sys_sendmsg net/socket.c:2325 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2325 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458da9 Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1e13087c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458da9 RDX: 0000000000000000 RSI: 0000000020000500 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1e130886d4 R13: 00000000004cd190 R14: 00000000004daca0 R15: 00000000ffffffff