bisecting fixing commit since f5d582777bcb1c7ff19a5a2343f66ea01de401c6 building syzkaller on 4093e33b1338f274ae0062f555de9d6af8640d61 testing commit f5d582777bcb1c7ff19a5a2343f66ea01de401c6 with gcc (GCC) 8.1.0 kernel signature: 1dc9b2d66ce24155af2e535bf5c91f5f5b011b2ba88f50767af8b6e24be026ef all runs: crashed: INFO: task hung in ctrl_getfamily testing current HEAD c9c9735c46f589b9877b7fc00c89ef1b61a31e18 testing commit c9c9735c46f589b9877b7fc00c89ef1b61a31e18 with gcc (GCC) 8.1.0 kernel signature: 35ce72cf1e4857d16958d6f3ceb0fcff80c2e825eed7ae4368bcdd51d553a5a5 run #0: crashed: INFO: task hung in ctrl_getfamily run #1: crashed: INFO: task hung in ctrl_getfamily run #2: crashed: INFO: task hung in genl_rcv_msg run #3: crashed: INFO: task hung in ctrl_getfamily run #4: crashed: INFO: task hung in genl_rcv_msg run #5: crashed: INFO: task hung in ctrl_getfamily run #6: crashed: INFO: task hung in ctrl_getfamily run #7: crashed: INFO: task hung in ctrl_getfamily run #8: crashed: INFO: task hung in genl_rcv_msg run #9: crashed: INFO: task hung in ctrl_getfamily revisions tested: 2, total time: 23m23.428228825s (build: 9m54.819855583s, test: 12m31.896818678s) the crash still happens on HEAD commit msg: Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi crash: INFO: task hung in ctrl_getfamily netlink: 16 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 332809352 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 84 bytes leftover after parsing attributes in process `syz-executor4'. INFO: task syz-executor1:9705 blocked for more than 143 seconds. Not tainted 5.8.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D13424 9705 6249 0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x3f3/0x890 kernel/sched/core.c:4527 schedule+0x3b/0xf0 kernel/sched/core.c:4602 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x472/0x9f0 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+0xfa/0x130 net/netlink/genetlink.c:978 genl_family_rcv_msg_doit net/netlink/genetlink.c:669 [inline] genl_family_rcv_msg net/netlink/genetlink.c:714 [inline] genl_rcv_msg+0x1d6/0x307 net/netlink/genetlink.c:731 netlink_rcv_skb+0x4a/0x120 net/netlink/af_netlink.c:2470 genl_rcv+0x23/0x40 net/netlink/genetlink.c:742 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x1a6/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x256/0x480 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x5e/0x60 net/socket.c:671 ____sys_sendmsg+0x1fc/0x270 net/socket.c:2353 ___sys_sendmsg+0x77/0xb0 net/socket.c:2407 __sys_sendmsg+0x5d/0xb0 net/socket.c:2440 __do_sys_sendmsg net/socket.c:2449 [inline] __se_sys_sendmsg net/socket.c:2447 [inline] __x64_sys_sendmsg+0x1a/0x20 net/socket.c:2447 do_syscall_64+0x37/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007f60af8479c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007f60af847a00 RDI: 0000000000000007 RBP: 0000000000000007 R08: 00007f60af8479d0 R09: 000000000072bf00 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f60af847a40 R13: 00000000004cc5b8 R14: 00000000004d9a88 R15: 00000000ffffffff INFO: task syz-executor3:9721 blocked for more than 143 seconds. Not tainted 5.8.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D13424 9721 6164 0x00000004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x3f3/0x890 kernel/sched/core.c:4527 schedule+0x3b/0xf0 kernel/sched/core.c:4602 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x472/0x9f0 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+0x227/0x307 net/netlink/genetlink.c:729 netlink_rcv_skb+0x4a/0x120 net/netlink/af_netlink.c:2470 genl_rcv+0x23/0x40 net/netlink/genetlink.c:742 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x1a6/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x256/0x480 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x5e/0x60 net/socket.c:671 ____sys_sendmsg+0x1fc/0x270 net/socket.c:2353 ___sys_sendmsg+0x77/0xb0 net/socket.c:2407 __sys_sendmsg+0x5d/0xb0 net/socket.c:2440 __do_sys_sendmsg net/socket.c:2449 [inline] __se_sys_sendmsg net/socket.c:2447 [inline] __x64_sys_sendmsg+0x1a/0x20 net/socket.c:2447 do_syscall_64+0x37/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007fbe34fab9c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007fbe34faba00 RDI: 0000000000000007 RBP: 0000000000000007 R08: 00007fbe34fab9d0 R09: 000000000072bf00 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fbe34faba40 R13: 00000000004cc5b8 R14: 00000000004d9a88 R15: 00000000ffffffff INFO: task syz-executor3:9737 blocked for more than 143 seconds. Not tainted 5.8.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D14008 9737 6164 0x00000004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x3f3/0x890 kernel/sched/core.c:4527 schedule+0x3b/0xf0 kernel/sched/core.c:4602 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x472/0x9f0 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+0x227/0x307 net/netlink/genetlink.c:729 netlink_rcv_skb+0x4a/0x120 net/netlink/af_netlink.c:2470 genl_rcv+0x23/0x40 net/netlink/genetlink.c:742 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x1a6/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x256/0x480 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x5e/0x60 net/socket.c:671 ____sys_sendmsg+0x1fc/0x270 net/socket.c:2353 ___sys_sendmsg+0x77/0xb0 net/socket.c:2407 __sys_sendmsg+0x5d/0xb0 net/socket.c:2440 __do_sys_sendmsg net/socket.c:2449 [inline] __se_sys_sendmsg net/socket.c:2447 [inline] __x64_sys_sendmsg+0x1a/0x20 net/socket.c:2447 do_syscall_64+0x37/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007fbe34f8a9c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fbe34f8aa58 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007fbe34f8aa00 RDI: 0000000000000008 RBP: 0000000000000008 R08: 000000000000000b R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000293 R12: 00007fbe34f8aa40 R13: 00000000004cc590 R14: 00000000004d9a70 R15: 00000000ffffffff INFO: task syz-executor0:9743 blocked for more than 144 seconds. Not tainted 5.8.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D14008 9743 6219 0x00000004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x3f3/0x890 kernel/sched/core.c:4527 schedule+0x3b/0xf0 kernel/sched/core.c:4602 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x472/0x9f0 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+0x227/0x307 net/netlink/genetlink.c:729 netlink_rcv_skb+0x4a/0x120 net/netlink/af_netlink.c:2470 genl_rcv+0x23/0x40 net/netlink/genetlink.c:742 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x1a6/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x256/0x480 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x5e/0x60 net/socket.c:671 ____sys_sendmsg+0x1fc/0x270 net/socket.c:2353 ___sys_sendmsg+0x77/0xb0 net/socket.c:2407 __sys_sendmsg+0x5d/0xb0 net/socket.c:2440 __do_sys_sendmsg net/socket.c:2449 [inline] __se_sys_sendmsg net/socket.c:2447 [inline] __x64_sys_sendmsg+0x1a/0x20 net/socket.c:2447 do_syscall_64+0x37/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007f659d2369c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007f659d236a00 RDI: 0000000000000005 RBP: 0000000000000005 R08: 00007f659d2369d0 R09: 000000000072bf00 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f659d236a40 R13: 00000000004cc5b8 R14: 00000000004d9a88 R15: 00000000ffffffff INFO: task syz-executor0:9751 blocked for more than 144 seconds. Not tainted 5.8.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D13600 9751 6219 0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x3f3/0x890 kernel/sched/core.c:4527 schedule+0x3b/0xf0 kernel/sched/core.c:4602 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x472/0x9f0 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+0x227/0x307 net/netlink/genetlink.c:729 netlink_rcv_skb+0x4a/0x120 net/netlink/af_netlink.c:2470 genl_rcv+0x23/0x40 net/netlink/genetlink.c:742 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x1a6/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x256/0x480 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x5e/0x60 net/socket.c:671 ____sys_sendmsg+0x1fc/0x270 net/socket.c:2353 ___sys_sendmsg+0x77/0xb0 net/socket.c:2407 __sys_sendmsg+0x5d/0xb0 net/socket.c:2440 __do_sys_sendmsg net/socket.c:2449 [inline] __se_sys_sendmsg net/socket.c:2447 [inline] __x64_sys_sendmsg+0x1a/0x20 net/socket.c:2447 do_syscall_64+0x37/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007f659d2159c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f659d215a58 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007f659d215a00 RDI: 0000000000000006 RBP: 0000000000000006 R08: 000000000000000b R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000293 R12: 00007f659d215a40 R13: 00000000004cc590 R14: 00000000004d9a70 R15: 00000000ffffffff INFO: task syz-executor0:9755 blocked for more than 144 seconds. Not tainted 5.8.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D14008 9755 6219 0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x3f3/0x890 kernel/sched/core.c:4527 schedule+0x3b/0xf0 kernel/sched/core.c:4602 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x472/0x9f0 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+0x227/0x307 net/netlink/genetlink.c:729 netlink_rcv_skb+0x4a/0x120 net/netlink/af_netlink.c:2470 genl_rcv+0x23/0x40 net/netlink/genetlink.c:742 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x1a6/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x256/0x480 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x5e/0x60 net/socket.c:671 ____sys_sendmsg+0x1fc/0x270 net/socket.c:2353 ___sys_sendmsg+0x77/0xb0 net/socket.c:2407 __sys_sendmsg+0x5d/0xb0 net/socket.c:2440 __do_sys_sendmsg net/socket.c:2449 [inline] __se_sys_sendmsg net/socket.c:2447 [inline] __x64_sys_sendmsg+0x1a/0x20 net/socket.c:2447 do_syscall_64+0x37/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007f659d1f49c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007f659d1f4a00 RDI: 0000000000000009 RBP: 0000000000000009 R08: 00007f659d1f49d0 R09: 000000000072c040 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f659d1f4a40 R13: 00000000004cc5b8 R14: 00000000004d9a88 R15: 00000000ffffffff INFO: task syz-executor0:9757 blocked for more than 144 seconds. Not tainted 5.8.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D14008 9757 6219 0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x3f3/0x890 kernel/sched/core.c:4527 schedule+0x3b/0xf0 kernel/sched/core.c:4602 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x472/0x9f0 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+0x227/0x307 net/netlink/genetlink.c:729 netlink_rcv_skb+0x4a/0x120 net/netlink/af_netlink.c:2470 genl_rcv+0x23/0x40 net/netlink/genetlink.c:742 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x1a6/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x256/0x480 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x5e/0x60 net/socket.c:671 ____sys_sendmsg+0x1fc/0x270 net/socket.c:2353 ___sys_sendmsg+0x77/0xb0 net/socket.c:2407 __sys_sendmsg+0x5d/0xb0 net/socket.c:2440 __do_sys_sendmsg net/socket.c:2449 [inline] __se_sys_sendmsg net/socket.c:2447 [inline] __x64_sys_sendmsg+0x1a/0x20 net/socket.c:2447 do_syscall_64+0x37/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007f659d1d39c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f659d1d3a58 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007f659d1d3a00 RDI: 000000000000000a RBP: 000000000000000a R08: 000000000000000b R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000293 R12: 00007f659d1d3a40 R13: 00000000004cc590 R14: 00000000004d9a70 R15: 00000000ffffffff INFO: task syz-executor4:9744 blocked for more than 144 seconds. Not tainted 5.8.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D14008 9744 6163 0x00000004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x3f3/0x890 kernel/sched/core.c:4527 schedule+0x3b/0xf0 kernel/sched/core.c:4602 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x472/0x9f0 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+0x227/0x307 net/netlink/genetlink.c:729 netlink_rcv_skb+0x4a/0x120 net/netlink/af_netlink.c:2470 genl_rcv+0x23/0x40 net/netlink/genetlink.c:742 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x1a6/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x256/0x480 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x5e/0x60 net/socket.c:671 ____sys_sendmsg+0x1fc/0x270 net/socket.c:2353 ___sys_sendmsg+0x77/0xb0 net/socket.c:2407 __sys_sendmsg+0x5d/0xb0 net/socket.c:2440 __do_sys_sendmsg net/socket.c:2449 [inline] __se_sys_sendmsg net/socket.c:2447 [inline] __x64_sys_sendmsg+0x1a/0x20 net/socket.c:2447 do_syscall_64+0x37/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007f1a209559c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007f1a20955a00 RDI: 0000000000000005 RBP: 0000000000000005 R08: 00007f1a209559d0 R09: 000000000072bf00 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f1a20955a40 R13: 00000000004cc5b8 R14: 00000000004d9a88 R15: 00000000ffffffff INFO: task syz-executor4:9752 blocked for more than 145 seconds. Not tainted 5.8.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D14008 9752 6163 0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x3f3/0x890 kernel/sched/core.c:4527 schedule+0x3b/0xf0 kernel/sched/core.c:4602 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x472/0x9f0 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+0x227/0x307 net/netlink/genetlink.c:729 netlink_rcv_skb+0x4a/0x120 net/netlink/af_netlink.c:2470 genl_rcv+0x23/0x40 net/netlink/genetlink.c:742 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x1a6/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x256/0x480 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x5e/0x60 net/socket.c:671 ____sys_sendmsg+0x1fc/0x270 net/socket.c:2353 ___sys_sendmsg+0x77/0xb0 net/socket.c:2407 __sys_sendmsg+0x5d/0xb0 net/socket.c:2440 __do_sys_sendmsg net/socket.c:2449 [inline] __se_sys_sendmsg net/socket.c:2447 [inline] __x64_sys_sendmsg+0x1a/0x20 net/socket.c:2447 do_syscall_64+0x37/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007f1a209349c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f1a20934a58 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007f1a20934a00 RDI: 0000000000000006 RBP: 0000000000000006 R08: 000000000000000b R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000293 R12: 00007f1a20934a40 R13: 00000000004cc590 R14: 00000000004d9a70 R15: 00000000ffffffff INFO: task syz-executor4:9754 blocked for more than 145 seconds. Not tainted 5.8.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D14008 9754 6163 0x00000004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x3f3/0x890 kernel/sched/core.c:4527 schedule+0x3b/0xf0 kernel/sched/core.c:4602 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x472/0x9f0 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+0x227/0x307 net/netlink/genetlink.c:729 netlink_rcv_skb+0x4a/0x120 net/netlink/af_netlink.c:2470 genl_rcv+0x23/0x40 net/netlink/genetlink.c:742 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x1a6/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x256/0x480 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x5e/0x60 net/socket.c:671 ____sys_sendmsg+0x1fc/0x270 net/socket.c:2353 ___sys_sendmsg+0x77/0xb0 net/socket.c:2407 __sys_sendmsg+0x5d/0xb0 net/socket.c:2440 __do_sys_sendmsg net/socket.c:2449 [inline] __se_sys_sendmsg net/socket.c:2447 [inline] __x64_sys_sendmsg+0x1a/0x20 net/socket.c:2447 do_syscall_64+0x37/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x411231 Code: Bad RIP value. RSP: 002b:00007f1a209139c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000411231 RDX: 0000000000000000 RSI: 00007f1a20913a00 RDI: 0000000000000009 RBP: 0000000000000009 R08: 00007f1a209139d0 R09: 000000000072c040 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f1a20913a40 R13: 00000000004cc5b8 R14: 00000000004d9a88 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/732: #0: ffffffff840e1180 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x23/0x17c kernel/locking/lockdep.c:5827 1 lock held by in:imklog/5694: #0: ffff888216d07cf0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x46/0x50 fs/file.c:930 2 locks held by syz-executor1/9705: #0: ffffffff842e7f10 (cb_lock){++++}-{3:3}, at: ctrl_getfamily+0xec/0x130 net/netlink/genetlink.c:977 #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: ctrl_getfamily+0xfa/0x130 net/netlink/genetlink.c:978 2 locks held by syz-executor2/9717: 2 locks held by syz-executor3/9721: #0: ffffffff842e7f10 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:741 #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x227/0x307 net/netlink/genetlink.c:729 2 locks held by syz-executor3/9737: #0: ffffffff842e7f10 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:741 #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x227/0x307 net/netlink/genetlink.c:729 2 locks held by syz-executor0/9743: #0: ffffffff842e7f10 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:741 #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x227/0x307 net/netlink/genetlink.c:729 2 locks held by syz-executor0/9751: #0: ffffffff842e7f10 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:741 #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x227/0x307 net/netlink/genetlink.c:729 2 locks held by syz-executor0/9755: #0: ffffffff842e7f10 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:741 #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x227/0x307 net/netlink/genetlink.c:729 2 locks held by syz-executor0/9757: #0: ffffffff842e7f10 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:741 #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x227/0x307 net/netlink/genetlink.c:729 2 locks held by syz-executor4/9744: #0: ffffffff842e7f10 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:741 #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x227/0x307 net/netlink/genetlink.c:729 2 locks held by syz-executor4/9752: #0: ffffffff842e7f10 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:741 #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x227/0x307 net/netlink/genetlink.c:729 2 locks held by syz-executor4/9754: #0: ffffffff842e7f10 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:741 #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x227/0x307 net/netlink/genetlink.c:729 2 locks held by syz-executor4/9758: #0: ffffffff842e7f10 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:741 #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x227/0x307 net/netlink/genetlink.c:729 2 locks held by syz-executor5/9748: #0: ffffffff842e7f10 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:741 #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x227/0x307 net/netlink/genetlink.c:729 2 locks held by syz-executor5/9753: #0: ffffffff842e7f10 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:741 #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x227/0x307 net/netlink/genetlink.c:729 2 locks held by syz-executor5/9756: #0: ffffffff842e7f10 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:741 #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x227/0x307 net/netlink/genetlink.c:729 2 locks held by syz-executor5/9761: #0: ffffffff842e7f10 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x40 net/netlink/genetlink.c:741 #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff842e7fa8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x227/0x307 net/netlink/genetlink.c:729 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 732 Comm: khungtaskd Not tainted 5.8.0-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+0xb9/0xf1 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.8+0x3e/0x57 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xe0/0xf7 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:39 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0x5b1/0x6a0 kernel/hung_task.c:295 kthread+0x162/0x180 kernel/kthread.c:292 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9717 Comm: syz-executor2 Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:67 Code: 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3 aa <4c> 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01 RSP: 0018:ffffc900048235b0 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000000 RDX: 0000000000000068 RSI: 0000000000000000 RDI: ffffc90004823700 RBP: ffffc90004823638 R08: 0000000000000000 R09: ffffc90004823698 R10: 000000000000000c R11: e711ce0eb115f5b8 R12: ffffc90004823698 R13: ffff8881f6d76018 R14: 000000000000000c R15: 0000000000000000 FS: 00007f2968c18700(0000) GS:ffff888218400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fce94b60000 CR3: 00000001f60f8000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __nla_parse+0x24/0x26 lib/nlattr.c:630 nla_parse_nested_deprecated include/net/netlink.h:1218 [inline] tipc_nl_publ_dump+0x83/0x3f0 net/tipc/socket.c:3764 __tipc_nl_compat_dumpit.isra.11+0x12c/0x380 net/tipc/netlink_compat.c:224 tipc_nl_compat_publ_dump net/tipc/netlink_compat.c:1022 [inline] tipc_nl_compat_sk_dump+0x203/0x2e0 net/tipc/netlink_compat.c:1074 __tipc_nl_compat_dumpit.isra.11+0x1b0/0x380 net/tipc/netlink_compat.c:235 tipc_nl_compat_dumpit+0xa9/0x150 net/tipc/netlink_compat.c:308 tipc_nl_compat_handle net/tipc/netlink_compat.c:1248 [inline] tipc_nl_compat_recv+0x1c0/0x570 net/tipc/netlink_compat.c:1311 genl_family_rcv_msg_doit net/netlink/genetlink.c:669 [inline] genl_family_rcv_msg net/netlink/genetlink.c:714 [inline] genl_rcv_msg+0x1d6/0x307 net/netlink/genetlink.c:731 netlink_rcv_skb+0x4a/0x120 net/netlink/af_netlink.c:2470 genl_rcv+0x23/0x40 net/netlink/genetlink.c:742 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x1a6/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x256/0x480 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x5e/0x60 net/socket.c:671 ____sys_sendmsg+0x1fc/0x270 net/socket.c:2353 ___sys_sendmsg+0x77/0xb0 net/socket.c:2407 __sys_sendmsg+0x5d/0xb0 net/socket.c:2440 __do_sys_sendmsg net/socket.c:2449 [inline] __se_sys_sendmsg net/socket.c:2447 [inline] __x64_sys_sendmsg+0x1a/0x20 net/socket.c:2447 do_syscall_64+0x37/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x457829 Code: 7d 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 4b b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2968c17c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457829 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000005 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2968c186d4 R13: 00000000004c4291 R14: 00000000004d7178 R15: 00000000ffffffff