INFO: task syz-executor.0:25772 blocked for more than 140 seconds. Not tainted 4.19.101-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28664 25772 7824 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 schedule+0x92/0x1c0 kernel/sched/core.c:3559 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1300 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/0x170 net/netlink/genetlink.c:625 netlink_rcv_skb+0x17d/0x460 net/netlink/af_netlink.c:2454 genl_rcv+0x29/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x53a/0x730 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:632 ___sys_sendmsg+0x803/0x920 net/socket.c:2115 __sys_sendmsg+0x105/0x1d0 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2160 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x415051 Code: 4c 89 e7 49 89 c5 e8 de 78 00 00 4c 89 e7 48 89 44 24 18 e8 31 79 00 00 48 8d 54 24 24 48 8d 74 24 28 4c 89 e7 4c 63 f0 89 c5 ba 6c 00 00 4c 89 e7 e8 a2 61 00 00 4c 89 e7 48 89 c3 e8 77 61 RSP: 002b:00007f0498a669c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f0498a66a58 RCX: 0000000000415051 RDX: 0000000000000000 RSI: 00007f0498a66a00 RDI: 0000000000000004 RBP: 0000000000000004 R08: 000000000000000b R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f0498a66a40 R13: 0000000000000b8e R14: 00000000004d63a8 R15: 000000000075bf2c INFO: task syz-executor.5:25876 blocked for more than 140 seconds. Not tainted 4.19.101-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28664 25876 8338 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 schedule+0x92/0x1c0 kernel/sched/core.c:3559 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1300 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/0x170 net/netlink/genetlink.c:625 netlink_rcv_skb+0x17d/0x460 net/netlink/af_netlink.c:2454 genl_rcv+0x29/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x53a/0x730 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:632 ___sys_sendmsg+0x803/0x920 net/socket.c:2115 __sys_sendmsg+0x105/0x1d0 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2160 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x415051 Code: 4c 89 e7 49 89 c5 e8 de 78 00 00 4c 89 e7 48 89 44 24 18 e8 31 79 00 00 48 8d 54 24 24 48 8d 74 24 28 4c 89 e7 4c 63 f0 89 c5 ba 6c 00 00 4c 89 e7 e8 a2 61 00 00 4c 89 e7 48 89 c3 e8 77 61 RSP: 002b:00007f4161c409c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f4161c40a58 RCX: 0000000000415051 RDX: 0000000000000000 RSI: 00007f4161c40a00 RDI: 0000000000000008 RBP: 0000000000000008 R08: 000000000000000b R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f4161c40a40 R13: 0000000000000b8e R14: 00000000004d63a8 R15: 000000000075bfd4 Showing all locks held in the system: 1 lock held by khungtaskd/1080: #0: 000000003242d623 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4438 1 lock held by rsyslogd/8150: #0: 00000000c016141f (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:767 2 locks held by getty/8272: #0: 000000007bccaa24 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 0000000064456bcc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/8273: #0: 00000000fd2e0c50 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 000000000521a8d0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/8274: #0: 0000000056f991f1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 0000000066ae46ad (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/8275: #0: 00000000a408c3d1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 000000005ca7cba2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/8276: #0: 00000000fcf3e49d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000efab3cfc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/8277: #0: 00000000f06ea6de (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 0000000080b332e1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/8278: #0: 0000000064cd5a96 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000a92b8226 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 4 locks held by syz-executor.1/25771: 2 locks held by syz-executor.0/25772: #0: 00000000be246158 (cb_lock){++++}, at: genl_rcv+0x1a/0x40 net/netlink/genetlink.c:637 #1: 0000000056317c4d (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 0000000056317c4d (genl_mutex){+.+.}, at: genl_rcv_msg+0x13e/0x170 net/netlink/genetlink.c:625 2 locks held by syz-executor.5/25876: #0: 00000000be246158 (cb_lock){++++}, at: genl_rcv+0x1a/0x40 net/netlink/genetlink.c:637 #1: 0000000056317c4d (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: 0000000056317c4d (genl_mutex){+.+.}, at: genl_rcv_msg+0x13e/0x170 net/netlink/genetlink.c:625 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1080 Comm: khungtaskd Not tainted 4.19.101-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+0x197/0x210 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 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+0x9df/0xee0 kernel/hung_task.c:287 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.015 msecs NMI backtrace for cpu 1 CPU: 1 PID: 25771 Comm: syz-executor.1 Not tainted 4.19.101-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:validate_nla+0x1dd/0x810 lib/nlattr.c:89 Code: 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 84 c0 74 0c 3c 01 7f 08 4c 89 ef e8 7e a4 28 fe 41 0f b7 45 00 41 89 c6 89 45 cc 6e 02 f1 fd 41 0f b7 fe 48 c7 c6 80 32 ed 87 e8 1e 04 f1 fd 41 RSP: 0018:ffff888029e26d58 EFLAGS: 00000246 RAX: 0000000000000002 RBX: ffff8880490dda94 RCX: ffffffff837a0866 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffff888029e26d90 R08: ffff8880a406e200 R09: ffff8882161d3c00 R10: ffffed1042c3a78a R11: ffff8882161d3c57 R12: 0000000000000002 R13: ffffffff8863a620 R14: 0000000000000008 R15: 0000000000000008 FS: 00007f7e56da0700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 000000009536b000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: nla_parse+0x153/0x2f0 lib/nlattr.c:254 nlmsg_parse include/net/netlink.h:398 [inline] tipc_nlmsg_parse+0xb7/0x100 net/tipc/netlink.c:276 tipc_nl_publ_dump+0x870/0xd67 net/tipc/socket.c:3509 __tipc_nl_compat_dumpit.isra.0+0x21a/0x950 net/tipc/netlink_compat.c:207 tipc_nl_compat_publ_dump net/tipc/netlink_compat.c:1008 [inline] tipc_nl_compat_sk_dump+0x54a/0x970 net/tipc/netlink_compat.c:1059 __tipc_nl_compat_dumpit.isra.0+0x320/0x950 net/tipc/netlink_compat.c:216 tipc_nl_compat_dumpit+0x24c/0x510 net/tipc/netlink_compat.c:288 tipc_nl_compat_handle net/tipc/netlink_compat.c:1258 [inline] tipc_nl_compat_recv+0x5a6/0xaf0 net/tipc/netlink_compat.c:1296 genl_family_rcv_msg+0x6db/0xd30 net/netlink/genetlink.c:602 genl_rcv_msg+0xca/0x170 net/netlink/genetlink.c:627 netlink_rcv_skb+0x17d/0x460 net/netlink/af_netlink.c:2454 genl_rcv+0x29/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x53a/0x730 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:632 ___sys_sendmsg+0x803/0x920 net/socket.c:2115 __sys_sendmsg+0x105/0x1d0 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2160 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b399 Code: ad b6 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 b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f7e56d9fc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f7e56da06d4 RCX: 000000000045b399 RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000004 RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000991 R14: 00000000004d4228 R15: 000000000075c07c