INFO: task syz-executor.2:30606 blocked for more than 143 seconds. Not tainted 5.14.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:28696 pid:30606 ppid: 25820 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4683 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5940 schedule+0xd3/0x270 kernel/sched/core.c:6019 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6078 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x7b6/0x10a0 kernel/locking/mutex.c:1104 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x3e0/0x580 net/netlink/genetlink.c:798 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 __sys_sendto+0x21c/0x320 net/socket.c:2019 __do_sys_sendto net/socket.c:2031 [inline] __se_sys_sendto net/socket.c:2027 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2027 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x41957c RSP: 002b:00007fc4c9fd5020 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fc4c9fd5110 RCX: 000000000041957c RDX: 0000000000000020 RSI: 00007fc4c9fd5160 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00007fc4c9fd5074 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 00007fc4c9fd50c8 R13: 00007fc4c9fd5160 R14: 0000000000000004 R15: 0000000000000000 Showing all locks held in the system: 3 locks held by kworker/u4:4/102: 1 lock held by khungtaskd/1650: #0: ffffffff8b97b9c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/8163: #0: ffff88802200c870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:974 3 locks held by syz-executor.5/30597: 2 locks held by syz-executor.2/30606: #0: ffffffff8d15d990 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:810 #1: ffffffff8d15da48 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff8d15da48 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x3e0/0x580 net/netlink/genetlink.c:798 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1650 Comm: khungtaskd Not tainted 5.14.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xd0a/0xfc0 kernel/hung_task.c:295 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 30597 Comm: syz-executor.5 Not tainted 5.14.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__rhashtable_lookup include/linux/rhashtable.h:614 [inline] RIP: 0010:rhashtable_lookup include/linux/rhashtable.h:638 [inline] RIP: 0010:tipc_sk_lookup+0x5fd/0xaa0 net/tipc/socket.c:2971 Code: 49 8d 7f 30 48 89 f8 48 c1 e8 03 42 80 3c 30 00 0f 85 a6 04 00 00 48 8b 7c 24 10 4d 8b 7f 30 e8 f9 01 34 fb 31 ff 89 c3 89 c6 0e ff d3 f8 85 db 0f 84 83 03 00 00 e8 c1 f7 d3 f8 4d 85 ff 0f RSP: 0018:ffffc9000283ecb0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90014617000 RDX: 0000000000040000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00000000000000db R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff83d5933b R11: 0000000000000000 R12: ffff88802b18c759 R13: ffff888032c90000 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007f75f5821700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe12be88000 CR3: 0000000073180000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tipc_nl_publ_dump+0x315/0xd40 net/tipc/socket.c:3785 __tipc_nl_compat_dumpit+0x2af/0xb30 net/tipc/netlink_compat.c:227 tipc_nl_compat_publ_dump net/tipc/netlink_compat.c:1035 [inline] tipc_nl_compat_sk_dump+0x4f1/0x890 net/tipc/netlink_compat.c:1087 __tipc_nl_compat_dumpit+0x418/0xb30 net/tipc/netlink_compat.c:238 tipc_nl_compat_dumpit+0x458/0x7f0 net/tipc/netlink_compat.c:321 tipc_nl_compat_handle net/tipc/netlink_compat.c:1286 [inline] tipc_nl_compat_recv+0x578/0xb40 net/tipc/netlink_compat.c:1324 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2392 ___sys_sendmsg+0xf3/0x170 net/socket.c:2446 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2475 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 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:00007f75f5821188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffc549e04df R14: 00007f75f5821300 R15: 0000000000022000