bisecting fixing commit since f5d582777bcb1c7ff19a5a2343f66ea01de401c6 building syzkaller on 4093e33b1338f274ae0062f555de9d6af8640d61 testing commit f5d582777bcb1c7ff19a5a2343f66ea01de401c6 with gcc (GCC) 8.1.0 kernel signature: 16f77671544695807c20fc37a908500a795ef806daebce7abc16410c5cb33676 all runs: crashed: INFO: task hung in ctrl_getfamily testing current HEAD b85051e755b0e9d6dd8f17ef1da083851b83287d testing commit b85051e755b0e9d6dd8f17ef1da083851b83287d with gcc (GCC) 8.1.0 kernel signature: 39994d2526db6f674d5e1efe6b6613dde2c12224a7110d3e455067d468b8556f all runs: crashed: INFO: task hung in ctrl_getfamily revisions tested: 2, total time: 25m27.216748006s (build: 11m57.47867267s, test: 12m39.276839251s) the crash still happens on HEAD commit msg: Merge tag 'fixes-for-5.7-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux crash: INFO: task hung in ctrl_getfamily 8021q: adding VLAN 0 to HW filter on device team0 IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready 8021q: adding VLAN 0 to HW filter on device team0 INFO: task syz-executor2:10343 blocked for more than 143 seconds. Not tainted 5.7.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D27560 10343 6343 0x00004004 Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x85b/0x1960 kernel/sched/core.c:4083 schedule+0xc3/0x2b0 kernel/sched/core.c:4158 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4217 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8b5/0x1410 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 genl_lock net/netlink/genetlink.c:33 [inline] ctrl_getfamily+0x2c0/0x400 net/netlink/genetlink.c:982 genl_family_rcv_msg_doit net/netlink/genetlink.c:673 [inline] genl_family_rcv_msg net/netlink/genetlink.c:718 [inline] genl_rcv_msg+0x5e1/0x10f0 net/netlink/genetlink.c:735 netlink_rcv_skb+0x13f/0x380 net/netlink/af_netlink.c:2469 genl_rcv+0x23/0x40 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x479/0x6c0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x7ab/0xd50 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xe6/0x110 net/socket.c:672 ____sys_sendmsg+0x609/0x980 net/socket.c:2362 ___sys_sendmsg+0xe4/0x160 net/socket.c:2416 __sys_sendmsg+0xd9/0x180 net/socket.c:2449 __do_sys_sendmsg net/socket.c:2458 [inline] __se_sys_sendmsg net/socket.c:2456 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2456 do_syscall_64+0xd0/0x630 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007f00427f89c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007f00427f8a00 RDI: 0000000000000005 RBP: 0000000000000005 R08: 00007f00427f89d0 R09: 000000000072bf00 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f00427f8a40 R13: 00000000004cc538 R14: 00000000004d9a08 R15: 00000000ffffffff INFO: task syz-executor2:10357 blocked for more than 143 seconds. Not tainted 5.7.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D28400 10357 6343 0x00000004 Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x85b/0x1960 kernel/sched/core.c:4083 schedule+0xc3/0x2b0 kernel/sched/core.c:4158 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4217 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8b5/0x1410 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 netlink_rcv_skb+0x13f/0x380 net/netlink/af_netlink.c:2469 genl_rcv+0x23/0x40 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x479/0x6c0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x7ab/0xd50 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xe6/0x110 net/socket.c:672 ____sys_sendmsg+0x609/0x980 net/socket.c:2362 ___sys_sendmsg+0xe4/0x160 net/socket.c:2416 __sys_sendmsg+0xd9/0x180 net/socket.c:2449 __do_sys_sendmsg net/socket.c:2458 [inline] __se_sys_sendmsg net/socket.c:2456 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2456 do_syscall_64+0xd0/0x630 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007f00427d79c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f00427d7a58 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007f00427d7a00 RDI: 0000000000000006 RBP: 0000000000000006 R08: 000000000000000b R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000293 R12: 00007f00427d7a40 R13: 00000000004cc510 R14: 00000000004d99f0 R15: 00000000ffffffff INFO: task syz-executor2:10364 blocked for more than 144 seconds. Not tainted 5.7.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D28296 10364 6343 0x00004004 Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x85b/0x1960 kernel/sched/core.c:4083 schedule+0xc3/0x2b0 kernel/sched/core.c:4158 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4217 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8b5/0x1410 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 netlink_rcv_skb+0x13f/0x380 net/netlink/af_netlink.c:2469 genl_rcv+0x23/0x40 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x479/0x6c0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x7ab/0xd50 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xe6/0x110 net/socket.c:672 ____sys_sendmsg+0x609/0x980 net/socket.c:2362 ___sys_sendmsg+0xe4/0x160 net/socket.c:2416 __sys_sendmsg+0xd9/0x180 net/socket.c:2449 __do_sys_sendmsg net/socket.c:2458 [inline] __se_sys_sendmsg net/socket.c:2456 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2456 do_syscall_64+0xd0/0x630 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007f00427b69c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007f00427b6a00 RDI: 0000000000000009 RBP: 0000000000000009 R08: 00007f00427b69d0 R09: 000000000072c040 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f00427b6a40 R13: 00000000004cc538 R14: 00000000004d9a08 R15: 00000000ffffffff INFO: task syz-executor4:10332 blocked for more than 144 seconds. Not tainted 5.7.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D26296 10332 6352 0x00004004 Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x85b/0x1960 kernel/sched/core.c:4083 schedule+0xc3/0x2b0 kernel/sched/core.c:4158 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4217 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8b5/0x1410 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 genl_lock net/netlink/genetlink.c:33 [inline] ctrl_getfamily+0x2c0/0x400 net/netlink/genetlink.c:982 genl_family_rcv_msg_doit net/netlink/genetlink.c:673 [inline] genl_family_rcv_msg net/netlink/genetlink.c:718 [inline] genl_rcv_msg+0x5e1/0x10f0 net/netlink/genetlink.c:735 netlink_rcv_skb+0x13f/0x380 net/netlink/af_netlink.c:2469 genl_rcv+0x23/0x40 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x479/0x6c0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x7ab/0xd50 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xe6/0x110 net/socket.c:672 ____sys_sendmsg+0x609/0x980 net/socket.c:2362 ___sys_sendmsg+0xe4/0x160 net/socket.c:2416 __sys_sendmsg+0xd9/0x180 net/socket.c:2449 __do_sys_sendmsg net/socket.c:2458 [inline] __se_sys_sendmsg net/socket.c:2456 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2456 do_syscall_64+0xd0/0x630 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007f8cdba659c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007f8cdba65a00 RDI: 0000000000000007 RBP: 0000000000000007 R08: 00007f8cdba659d0 R09: 000000000072bf00 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f8cdba65a40 R13: 00000000004cc538 R14: 00000000004d9a08 R15: 00000000ffffffff INFO: task syz-executor5:10344 blocked for more than 144 seconds. Not tainted 5.7.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D27560 10344 6355 0x00004004 Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x85b/0x1960 kernel/sched/core.c:4083 schedule+0xc3/0x2b0 kernel/sched/core.c:4158 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4217 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8b5/0x1410 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 genl_lock net/netlink/genetlink.c:33 [inline] ctrl_getfamily+0x2c0/0x400 net/netlink/genetlink.c:982 genl_family_rcv_msg_doit net/netlink/genetlink.c:673 [inline] genl_family_rcv_msg net/netlink/genetlink.c:718 [inline] genl_rcv_msg+0x5e1/0x10f0 net/netlink/genetlink.c:735 netlink_rcv_skb+0x13f/0x380 net/netlink/af_netlink.c:2469 genl_rcv+0x23/0x40 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x479/0x6c0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x7ab/0xd50 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xe6/0x110 net/socket.c:672 ____sys_sendmsg+0x609/0x980 net/socket.c:2362 ___sys_sendmsg+0xe4/0x160 net/socket.c:2416 __sys_sendmsg+0xd9/0x180 net/socket.c:2449 __do_sys_sendmsg net/socket.c:2458 [inline] __se_sys_sendmsg net/socket.c:2456 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2456 do_syscall_64+0xd0/0x630 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007f25a124d9c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007f25a124da00 RDI: 0000000000000005 RBP: 0000000000000005 R08: 00007f25a124d9d0 R09: 000000000072bf00 R10: ffffffffffffffff R11: 0000000000000293 R12: 00007f25a124da40 R13: 00000000004cc538 R14: 00000000004d9a08 R15: 00000000ffffffff INFO: task syz-executor5:10359 blocked for more than 145 seconds. Not tainted 5.7.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D28400 10359 6355 0x00000004 Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x85b/0x1960 kernel/sched/core.c:4083 schedule+0xc3/0x2b0 kernel/sched/core.c:4158 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4217 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8b5/0x1410 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 netlink_rcv_skb+0x13f/0x380 net/netlink/af_netlink.c:2469 genl_rcv+0x23/0x40 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x479/0x6c0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x7ab/0xd50 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xe6/0x110 net/socket.c:672 ____sys_sendmsg+0x609/0x980 net/socket.c:2362 ___sys_sendmsg+0xe4/0x160 net/socket.c:2416 __sys_sendmsg+0xd9/0x180 net/socket.c:2449 __do_sys_sendmsg net/socket.c:2458 [inline] __se_sys_sendmsg net/socket.c:2456 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2456 do_syscall_64+0xd0/0x630 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007f25a122c9c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f25a122ca58 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007f25a122ca00 RDI: 0000000000000006 RBP: 0000000000000006 R08: 000000000000000b R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000293 R12: 00007f25a122ca40 R13: 00000000004cc510 R14: 00000000004d99f0 R15: 00000000ffffffff INFO: task syz-executor5:10367 blocked for more than 145 seconds. Not tainted 5.7.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D28296 10367 6355 0x00004004 Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x85b/0x1960 kernel/sched/core.c:4083 schedule+0xc3/0x2b0 kernel/sched/core.c:4158 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4217 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8b5/0x1410 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 netlink_rcv_skb+0x13f/0x380 net/netlink/af_netlink.c:2469 genl_rcv+0x23/0x40 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x479/0x6c0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x7ab/0xd50 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xe6/0x110 net/socket.c:672 ____sys_sendmsg+0x609/0x980 net/socket.c:2362 ___sys_sendmsg+0xe4/0x160 net/socket.c:2416 __sys_sendmsg+0xd9/0x180 net/socket.c:2449 __do_sys_sendmsg net/socket.c:2458 [inline] __se_sys_sendmsg net/socket.c:2456 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2456 do_syscall_64+0xd0/0x630 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007f25a120b9c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007f25a120ba00 RDI: 0000000000000009 RBP: 0000000000000009 R08: 00007f25a120b9d0 R09: 000000000072c040 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f25a120ba40 R13: 00000000004cc538 R14: 00000000004d9a08 R15: 00000000ffffffff INFO: task syz-executor5:10374 blocked for more than 145 seconds. Not tainted 5.7.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D28400 10374 6355 0x00004004 Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x85b/0x1960 kernel/sched/core.c:4083 schedule+0xc3/0x2b0 kernel/sched/core.c:4158 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4217 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8b5/0x1410 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 netlink_rcv_skb+0x13f/0x380 net/netlink/af_netlink.c:2469 genl_rcv+0x23/0x40 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x479/0x6c0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x7ab/0xd50 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xe6/0x110 net/socket.c:672 ____sys_sendmsg+0x609/0x980 net/socket.c:2362 ___sys_sendmsg+0xe4/0x160 net/socket.c:2416 __sys_sendmsg+0xd9/0x180 net/socket.c:2449 __do_sys_sendmsg net/socket.c:2458 [inline] __se_sys_sendmsg net/socket.c:2456 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2456 do_syscall_64+0xd0/0x630 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007f25a11ea9c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f25a11eaa58 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007f25a11eaa00 RDI: 000000000000000a RBP: 000000000000000a R08: 000000000000000b R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000293 R12: 00007f25a11eaa40 R13: 00000000004cc510 R14: 00000000004d99f0 R15: 00000000ffffffff INFO: task syz-executor3:10350 blocked for more than 146 seconds. Not tainted 5.7.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D28400 10350 6344 0x00004004 Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x85b/0x1960 kernel/sched/core.c:4083 schedule+0xc3/0x2b0 kernel/sched/core.c:4158 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4217 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8b5/0x1410 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 netlink_rcv_skb+0x13f/0x380 net/netlink/af_netlink.c:2469 genl_rcv+0x23/0x40 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x479/0x6c0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x7ab/0xd50 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xe6/0x110 net/socket.c:672 ____sys_sendmsg+0x609/0x980 net/socket.c:2362 ___sys_sendmsg+0xe4/0x160 net/socket.c:2416 __sys_sendmsg+0xd9/0x180 net/socket.c:2449 __do_sys_sendmsg net/socket.c:2458 [inline] __se_sys_sendmsg net/socket.c:2456 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2456 do_syscall_64+0xd0/0x630 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007f1d4fcb09c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007f1d4fcb0a00 RDI: 0000000000000005 RBP: 0000000000000005 R08: 00007f1d4fcb09d0 R09: 000000000072bf00 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f1d4fcb0a40 R13: 00000000004cc538 R14: 00000000004d9a08 R15: 00000000ffffffff INFO: task syz-executor3:10362 blocked for more than 146 seconds. Not tainted 5.7.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D28400 10362 6344 0x00004004 Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x85b/0x1960 kernel/sched/core.c:4083 schedule+0xc3/0x2b0 kernel/sched/core.c:4158 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4217 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8b5/0x1410 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 netlink_rcv_skb+0x13f/0x380 net/netlink/af_netlink.c:2469 genl_rcv+0x23/0x40 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x479/0x6c0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x7ab/0xd50 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xe6/0x110 net/socket.c:672 ____sys_sendmsg+0x609/0x980 net/socket.c:2362 ___sys_sendmsg+0xe4/0x160 net/socket.c:2416 __sys_sendmsg+0xd9/0x180 net/socket.c:2449 __do_sys_sendmsg net/socket.c:2458 [inline] __se_sys_sendmsg net/socket.c:2456 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2456 do_syscall_64+0xd0/0x630 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007f1d4fc8f9c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f1d4fc8fa58 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007f1d4fc8fa00 RDI: 0000000000000006 RBP: 0000000000000006 R08: 000000000000000b R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000293 R12: 00007f1d4fc8fa40 R13: 00000000004cc510 R14: 00000000004d99f0 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1064: #0: ffffffff885b6640 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x5b/0x275 kernel/locking/lockdep.c:5756 1 lock held by in:imklog/5941: #0: ffff8881b58ea630 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xa9/0xc0 fs/file.c:826 2 locks held by syz-executor2/10343: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: ctrl_getfamily+0x2b2/0x400 net/netlink/genetlink.c:981 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: ctrl_getfamily+0x2c0/0x400 net/netlink/genetlink.c:982 2 locks held by syz-executor2/10357: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:745 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 2 locks held by syz-executor2/10364: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:745 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 2 locks held by syz-executor4/10332: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: ctrl_getfamily+0x2b2/0x400 net/netlink/genetlink.c:981 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: ctrl_getfamily+0x2c0/0x400 net/netlink/genetlink.c:982 3 locks held by syz-executor4/10348: 2 locks held by syz-executor5/10344: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: ctrl_getfamily+0x2b2/0x400 net/netlink/genetlink.c:981 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: ctrl_getfamily+0x2c0/0x400 net/netlink/genetlink.c:982 2 locks held by syz-executor5/10359: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:745 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 2 locks held by syz-executor5/10367: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:745 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 2 locks held by syz-executor5/10374: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:745 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 2 locks held by syz-executor3/10350: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:745 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 2 locks held by syz-executor3/10362: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:745 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 2 locks held by syz-executor3/10370: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:745 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 2 locks held by syz-executor3/10378: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:745 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 2 locks held by syz-executor1/10355: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:745 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 2 locks held by syz-executor1/10363: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:745 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 2 locks held by syz-executor1/10371: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:745 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 2 locks held by syz-executor1/10380: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:745 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 2 locks held by syz-executor0/10352: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: ctrl_getfamily+0x2b2/0x400 net/netlink/genetlink.c:981 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: ctrl_getfamily+0x2c0/0x400 net/netlink/genetlink.c:982 2 locks held by syz-executor0/10360: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:745 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 2 locks held by syz-executor0/10368: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:745 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 2 locks held by syz-executor0/10377: #0: ffffffff88fff330 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:745 #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88fff3e8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x66e/0x10f0 net/netlink/genetlink.c:733 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1064 Comm: khungtaskd Not tainted 5.7.0-rc6-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+0x12d/0x187 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.7+0x4b/0x84 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x18b/0x1b7 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:205 [inline] watchdog+0x611/0xc50 kernel/hung_task.c:289 kthread+0x357/0x420 kernel/kthread.c:268 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:351 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 10348 Comm: syz-executor4 Not tainted 5.7.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:rcu_read_lock_held+0x79/0xb0 kernel/rcu/update.c:308 Code: 00 48 89 45 f0 31 c0 e8 85 fe ff ff 84 c0 74 2c 0f b6 45 b8 48 ba 00 00 00 00 00 fc ff df 48 c7 04 13 00 00 00 00 48 8b 4d f0 <65> 48 33 0c 25 28 00 00 00 75 1a 48 83 c4 60 5b 5d c3 be ff ff ff RSP: 0018:ffff8881b1b7ebc0 EFLAGS: 00000286 RAX: 0000000000000001 RBX: 1ffff1103636fd78 RCX: 3f34cbab3b188700 RDX: dffffc0000000000 RSI: ffffffff885b6640 RDI: 0000000000000286 RBP: ffff8881b1b7ec28 R08: ffffed103b627064 R09: ffffed103b627064 R10: ffff8881db13831b R11: ffffed103b627063 R12: ffff8881bc5ac000 R13: ffff8881b1b7ed20 R14: ffff8881bc7cc458 R15: ffff8881bc7cc459 FS: 00007f8cdba45700(0000) GS:ffff8881db100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000116d978 CR3: 00000001bd260000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rht_ptr_rcu include/linux/rhashtable.h:372 [inline] __rhashtable_lookup include/linux/rhashtable.h:606 [inline] rhashtable_lookup include/linux/rhashtable.h:645 [inline] tipc_sk_lookup+0x527/0x8c0 net/tipc/socket.c:2926 tipc_nl_publ_dump+0x2df/0xca0 net/tipc/socket.c:3736 __tipc_nl_compat_dumpit.isra.11+0x32a/0xc10 net/tipc/netlink_compat.c:224 tipc_nl_compat_publ_dump net/tipc/netlink_compat.c:1022 [inline] tipc_nl_compat_sk_dump+0x4ed/0x990 net/tipc/netlink_compat.c:1074 __tipc_nl_compat_dumpit.isra.11+0x44f/0xc10 net/tipc/netlink_compat.c:235 tipc_nl_compat_dumpit+0x1e6/0x4c0 net/tipc/netlink_compat.c:308 tipc_nl_compat_handle net/tipc/netlink_compat.c:1248 [inline] tipc_nl_compat_recv+0x45a/0xa70 net/tipc/netlink_compat.c:1311 genl_family_rcv_msg_doit net/netlink/genetlink.c:673 [inline] genl_family_rcv_msg net/netlink/genetlink.c:718 [inline] genl_rcv_msg+0x5e1/0x10f0 net/netlink/genetlink.c:735 netlink_rcv_skb+0x13f/0x380 net/netlink/af_netlink.c:2469 genl_rcv+0x23/0x40 net/netlink/genetlink.c:746 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x479/0x6c0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x7ab/0xd50 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xe6/0x110 net/socket.c:672 ____sys_sendmsg+0x609/0x980 net/socket.c:2362 ___sys_sendmsg+0xe4/0x160 net/socket.c:2416 __sys_sendmsg+0xd9/0x180 net/socket.c:2449 __do_sys_sendmsg net/socket.c:2458 [inline] __se_sys_sendmsg net/socket.c:2456 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2456 do_syscall_64+0xd0/0x630 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x4577a9 Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8cdba44c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004577a9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000005 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8cdba456d4 R13: 00000000004c4211 R14: 00000000004d70f8 R15: 00000000ffffffff