Warning: Permanently added '10.128.0.244' (ED25519) to the list of known hosts. executing program [ 39.362296][ T3963] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:209 [ 39.364755][ T3963] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3963, name: syz-executor929 [ 39.367142][ T3963] 2 locks held by syz-executor929/3963: [ 39.368499][ T3963] #0: ffff8000169e74a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 39.371046][ T3963] #1: ffff0000d8631108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 39.373557][ T3963] Preemption disabled at: [ 39.373570][ T3963] [] netem_change+0x22c/0x1a90 [ 39.376131][ T3963] CPU: 1 PID: 3963 Comm: syz-executor929 Not tainted 5.15.126-syzkaller-00092-g24c4de4069cb #0 [ 39.378661][ T3963] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 39.381133][ T3963] Call trace: [ 39.381928][ T3963] dump_backtrace+0x0/0x530 [ 39.383036][ T3963] show_stack+0x2c/0x3c [ 39.384085][ T3963] dump_stack_lvl+0x108/0x170 [ 39.385218][ T3963] dump_stack+0x1c/0x58 [ 39.386299][ T3963] ___might_sleep+0x380/0x4dc [ 39.387469][ T3963] __might_sleep+0x98/0xf0 [ 39.388563][ T3963] slab_pre_alloc_hook+0x58/0xe8 [ 39.389751][ T3963] __kmalloc_node+0xbc/0x5b8 [ 39.390926][ T3963] kvmalloc_node+0x88/0x204 [ 39.392102][ T3963] get_dist_table+0x9c/0x2a4 [ 39.393250][ T3963] netem_change+0x7cc/0x1a90 [ 39.394416][ T3963] netem_init+0x54/0xb8 [ 39.395539][ T3963] qdisc_create+0x6fc/0xf44 [ 39.396725][ T3963] tc_modify_qdisc+0x8dc/0x1344 [ 39.397981][ T3963] rtnetlink_rcv_msg+0xa74/0xdac [ 39.399179][ T3963] netlink_rcv_skb+0x20c/0x3b8 [ 39.400339][ T3963] rtnetlink_rcv+0x28/0x38 [ 39.401472][ T3963] netlink_unicast+0x664/0x938 [ 39.402692][ T3963] netlink_sendmsg+0x844/0xb38 [ 39.403902][ T3963] ____sys_sendmsg+0x584/0x870 [ 39.405098][ T3963] ___sys_sendmsg+0x214/0x294 [ 39.406261][ T3963] __arm64_sys_sendmsg+0x1ac/0x25c [ 39.407569][ T3963] invoke_syscall+0x98/0x2b8 [ 39.408694][ T3963] el0_svc_common+0x138/0x258 [ 39.409844][ T3963] do_el0_svc+0x58/0x14c [ 39.410884][ T3963] el0_svc+0x7c/0x1f0 [ 39.411859][ T3963] el0t_64_sync_handler+0x84/0xe4 [ 39.413084][ T3963] el0t_64_sync+0x1a0/0x1a4 [ 39.414288][ T3963] [ 39.414845][ T3963] ============================================ [ 39.416354][ T3963] WARNING: possible recursive locking detected [ 39.417822][ T3963] 5.15.126-syzkaller-00092-g24c4de4069cb #0 Tainted: G W [ 39.419841][ T3963] -------------------------------------------- [ 39.421349][ T3963] syz-executor929/3963 is trying to acquire lock: [ 39.423086][ T3963] ffff0000d8631108 (&sch->q.lock){+...}-{2:2}, at: get_dist_table+0x1f0/0x2a4 [ 39.425454][ T3963] [ 39.425454][ T3963] but task is already holding lock: [ 39.427268][ T3963] ffff0000d8631108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 39.429563][ T3963] [ 39.429563][ T3963] other info that might help us debug this: [ 39.431618][ T3963] Possible unsafe locking scenario: [ 39.431618][ T3963] [ 39.433613][ T3963] CPU0 [ 39.434434][ T3963] ---- [ 39.435214][ T3963] lock(&sch->q.lock); [ 39.436251][ T3963] lock(&sch->q.lock); [ 39.437305][ T3963] [ 39.437305][ T3963] *** DEADLOCK *** [ 39.437305][ T3963] [ 39.439328][ T3963] May be due to missing lock nesting notation [ 39.439328][ T3963] [ 39.441376][ T3963] 2 locks held by syz-executor929/3963: [ 39.442816][ T3963] #0: ffff8000169e74a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 39.445202][ T3963] #1: ffff0000d8631108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 39.447448][ T3963] [ 39.447448][ T3963] stack backtrace: [ 39.448946][ T3963] CPU: 1 PID: 3963 Comm: syz-executor929 Tainted: G W 5.15.126-syzkaller-00092-g24c4de4069cb #0 [ 39.451833][ T3963] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 39.454318][ T3963] Call trace: [ 39.455188][ T3963] dump_backtrace+0x0/0x530 [ 39.456315][ T3963] show_stack+0x2c/0x3c [ 39.457325][ T3963] dump_stack_lvl+0x108/0x170 [ 39.458501][ T3963] dump_stack+0x1c/0x58 [ 39.459537][ T3963] __lock_acquire+0x62b4/0x7620 [ 39.460754][ T3963] lock_acquire+0x240/0x77c [ 39.461850][ T3963] _raw_spin_lock_bh+0x124/0x1c4 [ 39.463055][ T3963] get_dist_table+0x1f0/0x2a4 [ 39.464216][ T3963] netem_change+0x7cc/0x1a90 [ 39.465349][ T3963] netem_init+0x54/0xb8 [ 39.466412][ T3963] qdisc_create+0x6fc/0xf44 [ 39.467534][ T3963] tc_modify_qdisc+0x8dc/0x1344 [ 39.468739][ T3963] rtnetlink_rcv_msg+0xa74/0xdac [ 39.469947][ T3963] netlink_rcv_skb+0x20c/0x3b8 [ 39.471206][ T3963] rtnetlink_rcv+0x28/0x38 [ 39.472306][ T3963] netlink_unicast+0x664/0x938 [ 39.473526][ T3963] netlink_sendmsg+0x844/0xb38 [ 39.474717][ T3963] ____sys_sendmsg+0x584/0x870 [ 39.475891][ T3963] ___sys_sendmsg+0x214/0x294 [ 39.477104][ T3963] __arm64_sys_sendmsg+0x1ac/0x25c [ 39.478437][ T3963] invoke_syscall+0x98/0x2b8 [ 39.479603][ T3963] el0_svc_common+0x138/0x258 [ 39.480801][ T3963] do_el0_svc+0x58/0x14c [ 39.481860][ T3963] el0_svc+0x7c/0x1f0 [ 39.482870][ T3963] el0t_64_sync_handler+0x84/0xe4 [ 39.484123][ T3963] el0t_64_sync+0x1a0/0x1a4