Warning: Permanently added '10.128.1.100' (ED25519) to the list of known hosts. executing program [ 43.672608][ T3969] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:209 [ 43.674563][ T3969] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3969, name: syz-executor314 [ 43.676652][ T3969] 2 locks held by syz-executor314/3969: [ 43.677778][ T3969] #0: ffff8000169e74a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 43.679683][ T3969] #1: ffff0000cb6bf108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 43.681705][ T3969] Preemption disabled at: [ 43.681717][ T3969] [] netem_change+0x22c/0x1a90 [ 43.684163][ T3969] CPU: 0 PID: 3969 Comm: syz-executor314 Not tainted 5.15.126-syzkaller-00092-g24c4de4069cb #0 [ 43.686298][ T3969] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 43.688365][ T3969] Call trace: [ 43.689148][ T3969] dump_backtrace+0x0/0x530 [ 43.690185][ T3969] show_stack+0x2c/0x3c [ 43.690965][ T3969] dump_stack_lvl+0x108/0x170 [ 43.692017][ T3969] dump_stack+0x1c/0x58 [ 43.692938][ T3969] ___might_sleep+0x380/0x4dc [ 43.693924][ T3969] __might_sleep+0x98/0xf0 [ 43.695000][ T3969] slab_pre_alloc_hook+0x58/0xe8 [ 43.696432][ T3969] __kmalloc_node+0xbc/0x5b8 [ 43.697501][ T3969] kvmalloc_node+0x88/0x204 [ 43.698538][ T3969] get_dist_table+0x9c/0x2a4 [ 43.699745][ T3969] netem_change+0x7cc/0x1a90 [ 43.700977][ T3969] netem_init+0x54/0xb8 [ 43.702087][ T3969] qdisc_create+0x6fc/0xf44 [ 43.703114][ T3969] tc_modify_qdisc+0x8dc/0x1344 [ 43.704203][ T3969] rtnetlink_rcv_msg+0xa74/0xdac [ 43.705400][ T3969] netlink_rcv_skb+0x20c/0x3b8 [ 43.706439][ T3969] rtnetlink_rcv+0x28/0x38 [ 43.707583][ T3969] netlink_unicast+0x664/0x938 [ 43.708822][ T3969] netlink_sendmsg+0x844/0xb38 [ 43.709914][ T3969] ____sys_sendmsg+0x584/0x870 [ 43.710998][ T3969] ___sys_sendmsg+0x214/0x294 [ 43.712156][ T3969] __arm64_sys_sendmsg+0x1ac/0x25c [ 43.713355][ T3969] invoke_syscall+0x98/0x2b8 [ 43.714516][ T3969] el0_svc_common+0x138/0x258 [ 43.715724][ T3969] do_el0_svc+0x58/0x14c [ 43.716866][ T3969] el0_svc+0x7c/0x1f0 [ 43.717786][ T3969] el0t_64_sync_handler+0x84/0xe4 [ 43.718889][ T3969] el0t_64_sync+0x1a0/0x1a4 [ 43.720237][ T3969] [ 43.720700][ T3969] ============================================ [ 43.722116][ T3969] WARNING: possible recursive locking detected [ 43.723694][ T3969] 5.15.126-syzkaller-00092-g24c4de4069cb #0 Tainted: G W [ 43.725720][ T3969] -------------------------------------------- [ 43.727016][ T3969] syz-executor314/3969 is trying to acquire lock: [ 43.728516][ T3969] ffff0000cb6bf108 (&sch->q.lock){+...}-{2:2}, at: get_dist_table+0x1f0/0x2a4 [ 43.730724][ T3969] [ 43.730724][ T3969] but task is already holding lock: [ 43.732774][ T3969] ffff0000cb6bf108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 43.734859][ T3969] [ 43.734859][ T3969] other info that might help us debug this: [ 43.736800][ T3969] Possible unsafe locking scenario: [ 43.736800][ T3969] [ 43.738835][ T3969] CPU0 [ 43.739506][ T3969] ---- [ 43.740274][ T3969] lock(&sch->q.lock); [ 43.741487][ T3969] lock(&sch->q.lock); [ 43.742327][ T3969] [ 43.742327][ T3969] *** DEADLOCK *** [ 43.742327][ T3969] [ 43.744366][ T3969] May be due to missing lock nesting notation [ 43.744366][ T3969] [ 43.746421][ T3969] 2 locks held by syz-executor314/3969: [ 43.747627][ T3969] #0: ffff8000169e74a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 43.749944][ T3969] #1: ffff0000cb6bf108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 43.752115][ T3969] [ 43.752115][ T3969] stack backtrace: [ 43.753491][ T3969] CPU: 0 PID: 3969 Comm: syz-executor314 Tainted: G W 5.15.126-syzkaller-00092-g24c4de4069cb #0 [ 43.756535][ T3969] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 43.759048][ T3969] Call trace: [ 43.759882][ T3969] dump_backtrace+0x0/0x530 [ 43.761071][ T3969] show_stack+0x2c/0x3c [ 43.762127][ T3969] dump_stack_lvl+0x108/0x170 [ 43.763244][ T3969] dump_stack+0x1c/0x58 [ 43.764246][ T3969] __lock_acquire+0x62b4/0x7620 [ 43.765357][ T3969] lock_acquire+0x240/0x77c [ 43.766520][ T3969] _raw_spin_lock_bh+0x124/0x1c4 [ 43.767843][ T3969] get_dist_table+0x1f0/0x2a4 [ 43.769010][ T3969] netem_change+0x7cc/0x1a90 [ 43.769962][ T3969] netem_init+0x54/0xb8 [ 43.770974][ T3969] qdisc_create+0x6fc/0xf44 [ 43.772003][ T3969] tc_modify_qdisc+0x8dc/0x1344 [ 43.773415][ T3969] rtnetlink_rcv_msg+0xa74/0xdac [ 43.774623][ T3969] netlink_rcv_skb+0x20c/0x3b8 [ 43.775701][ T3969] rtnetlink_rcv+0x28/0x38 [ 43.776768][ T3969] netlink_unicast+0x664/0x938 [ 43.777835][ T3969] netlink_sendmsg+0x844/0xb38 [ 43.779101][ T3969] ____sys_sendmsg+0x584/0x870 [ 43.780236][ T3969] ___sys_sendmsg+0x214/0x294 [ 43.781330][ T3969] __arm64_sys_sendmsg+0x1ac/0x25c [ 43.782736][ T3969] invoke_syscall+0x98/0x2b8 [ 43.783802][ T3969] el0_svc_common+0x138/0x258 [ 43.784879][ T3969] do_el0_svc+0x58/0x14c [ 43.785876][ T3969] el0_svc+0x7c/0x1f0 [ 43.786881][ T3969] el0t_64_sync_handler+0x84/0xe4 [ 43.788002][ T3969] el0t_64_sync+0x1a0/0x1a4