Warning: Permanently added '10.128.0.55' (ED25519) to the list of known hosts. executing program [ 37.118009][ T3962] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:209 [ 37.120542][ T3962] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3962, name: syz-executor285 [ 37.122962][ T3962] 2 locks held by syz-executor285/3962: [ 37.124578][ T3962] #0: ffff8000169e74a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 37.127085][ T3962] #1: ffff0000d3cbf908 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 37.129572][ T3962] Preemption disabled at: [ 37.129585][ T3962] [] netem_change+0x22c/0x1a90 [ 37.132169][ T3962] CPU: 1 PID: 3962 Comm: syz-executor285 Not tainted 5.15.126-syzkaller-00092-g24c4de4069cb #0 [ 37.134810][ T3962] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 37.137477][ T3962] Call trace: [ 37.138323][ T3962] dump_backtrace+0x0/0x530 [ 37.139464][ T3962] show_stack+0x2c/0x3c [ 37.140530][ T3962] dump_stack_lvl+0x108/0x170 [ 37.141728][ T3962] dump_stack+0x1c/0x58 [ 37.142777][ T3962] ___might_sleep+0x380/0x4dc [ 37.144007][ T3962] __might_sleep+0x98/0xf0 [ 37.145085][ T3962] slab_pre_alloc_hook+0x58/0xe8 [ 37.146363][ T3962] __kmalloc_node+0xbc/0x5b8 [ 37.147500][ T3962] kvmalloc_node+0x88/0x204 [ 37.148674][ T3962] get_dist_table+0x9c/0x2a4 [ 37.149841][ T3962] netem_change+0x820/0x1a90 [ 37.150987][ T3962] netem_init+0x54/0xb8 [ 37.152052][ T3962] qdisc_create+0x6fc/0xf44 [ 37.153286][ T3962] tc_modify_qdisc+0x8dc/0x1344 [ 37.154553][ T3962] rtnetlink_rcv_msg+0xa74/0xdac [ 37.155810][ T3962] netlink_rcv_skb+0x20c/0x3b8 [ 37.157055][ T3962] rtnetlink_rcv+0x28/0x38 [ 37.158149][ T3962] netlink_unicast+0x664/0x938 [ 37.159341][ T3962] netlink_sendmsg+0x844/0xb38 [ 37.160577][ T3962] ____sys_sendmsg+0x584/0x870 [ 37.161799][ T3962] ___sys_sendmsg+0x214/0x294 [ 37.163034][ T3962] __arm64_sys_sendmsg+0x1ac/0x25c [ 37.164370][ T3962] invoke_syscall+0x98/0x2b8 [ 37.165521][ T3962] el0_svc_common+0x138/0x258 [ 37.166708][ T3962] do_el0_svc+0x58/0x14c [ 37.167806][ T3962] el0_svc+0x7c/0x1f0 [ 37.168834][ T3962] el0t_64_sync_handler+0x84/0xe4 [ 37.170068][ T3962] el0t_64_sync+0x1a0/0x1a4 [ 37.171274][ T3962] [ 37.171864][ T3962] ============================================ [ 37.173358][ T3962] WARNING: possible recursive locking detected [ 37.174863][ T3962] 5.15.126-syzkaller-00092-g24c4de4069cb #0 Tainted: G W [ 37.177009][ T3962] -------------------------------------------- [ 37.178602][ T3962] syz-executor285/3962 is trying to acquire lock: [ 37.180254][ T3962] ffff0000d3cbf908 (&sch->q.lock){+...}-{2:2}, at: get_dist_table+0x1f0/0x2a4 [ 37.182584][ T3962] [ 37.182584][ T3962] but task is already holding lock: [ 37.184476][ T3962] ffff0000d3cbf908 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 37.186833][ T3962] [ 37.186833][ T3962] other info that might help us debug this: [ 37.188954][ T3962] Possible unsafe locking scenario: [ 37.188954][ T3962] [ 37.190916][ T3962] CPU0 [ 37.191800][ T3962] ---- [ 37.192683][ T3962] lock(&sch->q.lock); [ 37.193797][ T3962] lock(&sch->q.lock); [ 37.194838][ T3962] [ 37.194838][ T3962] *** DEADLOCK *** [ 37.194838][ T3962] [ 37.197004][ T3962] May be due to missing lock nesting notation [ 37.197004][ T3962] [ 37.199096][ T3962] 2 locks held by syz-executor285/3962: [ 37.200525][ T3962] #0: ffff8000169e74a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 37.202939][ T3962] #1: ffff0000d3cbf908 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 37.205266][ T3962] [ 37.205266][ T3962] stack backtrace: [ 37.206775][ T3962] CPU: 1 PID: 3962 Comm: syz-executor285 Tainted: G W 5.15.126-syzkaller-00092-g24c4de4069cb #0 [ 37.209768][ T3962] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 37.212303][ T3962] Call trace: [ 37.213120][ T3962] dump_backtrace+0x0/0x530 [ 37.214214][ T3962] show_stack+0x2c/0x3c [ 37.215303][ T3962] dump_stack_lvl+0x108/0x170 [ 37.216497][ T3962] dump_stack+0x1c/0x58 [ 37.217603][ T3962] __lock_acquire+0x62b4/0x7620 [ 37.218814][ T3962] lock_acquire+0x240/0x77c [ 37.219966][ T3962] _raw_spin_lock_bh+0x124/0x1c4 [ 37.221258][ T3962] get_dist_table+0x1f0/0x2a4 [ 37.222465][ T3962] netem_change+0x820/0x1a90 [ 37.223614][ T3962] netem_init+0x54/0xb8 [ 37.224631][ T3962] qdisc_create+0x6fc/0xf44 [ 37.225843][ T3962] tc_modify_qdisc+0x8dc/0x1344 [ 37.227075][ T3962] rtnetlink_rcv_msg+0xa74/0xdac [ 37.228366][ T3962] netlink_rcv_skb+0x20c/0x3b8 [ 37.229575][ T3962] rtnetlink_rcv+0x28/0x38 [ 37.230738][ T3962] netlink_unicast+0x664/0x938 [ 37.231933][ T3962] netlink_sendmsg+0x844/0xb38 [ 37.233140][ T3962] ____sys_sendmsg+0x584/0x870 [ 37.234369][ T3962] ___sys_sendmsg+0x214/0x294 [ 37.235611][ T3962] __arm64_sys_sendmsg+0x1ac/0x25c [ 37.236905][ T3962] invoke_syscall+0x98/0x2b8 [ 37.238126][ T3962] el0_svc_common+0x138/0x258 [ 37.239348][ T3962] do_el0_svc+0x58/0x14c [ 37.240419][ T3962] el0_svc+0x7c/0x1f0 [ 37.241451][ T3962] el0t_64_sync_handler+0x84/0xe4 [ 37.242823][ T3962] el0t_64_sync+0x1a0/0x1a4