bisecting fixing commit since c3038e718a19fc596f7b1baba0f83d5146dc7784 building syzkaller on 8c88c9c1c99c8cd8dabc951164c820b9c9f25114 testing commit c3038e718a19fc596f7b1baba0f83d5146dc7784 with gcc (GCC) 8.1.0 kernel signature: 49911816231b5d7728d5e0dc68e6f47709aa31c16326a9000b9e1fac44d8868d all runs: crashed: BUG: sleeping function called from invalid context in htb_destroy testing current HEAD c37da90efff5f183bea6ae4c2af33571f61fe317 testing commit c37da90efff5f183bea6ae4c2af33571f61fe317 with gcc (GCC) 8.1.0 kernel signature: 71855ef16da601440e4d20b3f7b92655d080102df4220fd649f13960e496aef5 all runs: crashed: BUG: sleeping function called from invalid context in htb_destroy revisions tested: 2, total time: 28m35.636892722s (build: 20m48.907757595s, test: 5m58.276976781s) the crash still happens on HEAD commit msg: Linux 4.19.143 crash: BUG: sleeping function called from invalid context in htb_destroy 8021q: adding VLAN 0 to HW filter on device batadv0 8021q: adding VLAN 0 to HW filter on device batadv0 8021q: adding VLAN 0 to HW filter on device batadv0 IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready BUG: sleeping function called from invalid context at kernel/workqueue.c:2864 in_atomic(): 1, irqs_disabled(): 0, pid: 7275, name: syz-executor.0 2 locks held by syz-executor.0/7275: #0: 000000003623832b (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline] #0: 000000003623832b (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x301/0x8f0 net/core/rtnetlink.c:4775 #1: 00000000117f04cd (&qdisc_rx_lock){+...}, at: spin_lock_bh include/linux/spinlock.h:334 [inline] #1: 00000000117f04cd (&qdisc_rx_lock){+...}, at: sch_tree_lock include/net/sch_generic.h:477 [inline] #1: 00000000117f04cd (&qdisc_rx_lock){+...}, at: red_change+0x388/0x1790 net/sched/sch_red.c:230 Preemption disabled at: [] spin_lock_bh include/linux/spinlock.h:334 [inline] [] sch_tree_lock include/net/sch_generic.h:477 [inline] [] red_change+0x388/0x1790 net/sched/sch_red.c:230 CPU: 1 PID: 7275 Comm: syz-executor.0 Not tainted 4.19.143-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+0x123/0x177 lib/dump_stack.c:118 ___might_sleep.cold.88+0x1bb/0x1f4 kernel/sched/core.c:6196 __might_sleep+0x95/0x190 kernel/sched/core.c:6149 start_flush_work kernel/workqueue.c:2864 [inline] __flush_work+0xbd/0x7f0 kernel/workqueue.c:2927 __cancel_work_timer+0x2f1/0x430 kernel/workqueue.c:3015 cancel_work_sync+0xb/0x10 kernel/workqueue.c:3051 htb_destroy+0x20/0x4c0 net/sched/sch_htb.c:1241 qdisc_destroy+0x134/0x660 net/sched/sch_generic.c:983 red_change+0x6ee/0x1790 net/sched/sch_red.c:236 qdisc_change net/sched/sch_api.c:1239 [inline] tc_modify_qdisc+0xc2f/0x18f4 net/sched/sch_api.c:1542 rtnetlink_rcv_msg+0x34f/0x8f0 net/core/rtnetlink.c:4778 netlink_rcv_skb+0x13e/0x3d0 net/netlink/af_netlink.c:2455 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:4796 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x445/0x640 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x765/0xc50 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:632 ___sys_sendmsg+0x647/0x950 net/socket.c:2115 __sys_sendmsg+0xd9/0x180 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2160 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459ad9 Code: 7d b7 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 b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2cebbb6c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459ad9 RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000004 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2cebbb76d4 R13: 00000000004c7c8c R14: 00000000004ddb58 R15: 00000000ffffffff IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready 8021q: adding VLAN 0 to HW filter on device batadv0 8021q: adding VLAN 0 to HW filter on device batadv0 BUG: sleeping function called from invalid context at kernel/workqueue.c:2864 in_atomic(): 1, irqs_disabled(): 0, pid: 7436, name: syz-executor.2 2 locks held by syz-executor.2/7436: #0: 000000003623832b (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline] #0: 000000003623832b (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x301/0x8f0 net/core/rtnetlink.c:4775 #1: 000000000e82d0ed (&qdisc_rx_lock){+...}, at: spin_lock_bh include/linux/spinlock.h:334 [inline] #1: 000000000e82d0ed (&qdisc_rx_lock){+...}, at: sch_tree_lock include/net/sch_generic.h:477 [inline] #1: 000000000e82d0ed (&qdisc_rx_lock){+...}, at: red_change+0x388/0x1790 net/sched/sch_red.c:230 Preemption disabled at: [] spin_lock_bh include/linux/spinlock.h:334 [inline] [] sch_tree_lock include/net/sch_generic.h:477 [inline] [] red_change+0x388/0x1790 net/sched/sch_red.c:230 CPU: 1 PID: 7436 Comm: syz-executor.2 Tainted: G W 4.19.143-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+0x123/0x177 lib/dump_stack.c:118 ___might_sleep.cold.88+0x1bb/0x1f4 kernel/sched/core.c:6196 __might_sleep+0x95/0x190 kernel/sched/core.c:6149 start_flush_work kernel/workqueue.c:2864 [inline] __flush_work+0xbd/0x7f0 kernel/workqueue.c:2927 __cancel_work_timer+0x2f1/0x430 kernel/workqueue.c:3015 cancel_work_sync+0xb/0x10 kernel/workqueue.c:3051 htb_destroy+0x20/0x4c0 net/sched/sch_htb.c:1241 qdisc_destroy+0x134/0x660 net/sched/sch_generic.c:983 red_change+0x6ee/0x1790 net/sched/sch_red.c:236 qdisc_change net/sched/sch_api.c:1239 [inline] tc_modify_qdisc+0xc2f/0x18f4 net/sched/sch_api.c:1542 rtnetlink_rcv_msg+0x34f/0x8f0 net/core/rtnetlink.c:4778 netlink_rcv_skb+0x13e/0x3d0 net/netlink/af_netlink.c:2455 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:4796 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x445/0x640 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x765/0xc50 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:632 ___sys_sendmsg+0x647/0x950 net/socket.c:2115 __sys_sendmsg+0xd9/0x180 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2160 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459ad9 Code: 7d b7 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 b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f44534e4c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459ad9 RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000004 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f44534e56d4 R13: 00000000004c7c8c R14: 00000000004ddb58 R15: 00000000ffffffff