Warning: Permanently added '10.128.1.30' (ED25519) to the list of known hosts. executing program [ 44.837801][ T3963] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:209 [ 44.840088][ T3963] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3963, name: syz-executor228 [ 44.842006][ T3963] 2 locks held by syz-executor228/3963: [ 44.843156][ T3963] #0: ffff8000169e74a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 44.845089][ T3963] #1: ffff0000dbdf7108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 44.847090][ T3963] Preemption disabled at: [ 44.847102][ T3963] [] netem_change+0x22c/0x1a90 [ 44.849441][ T3963] CPU: 0 PID: 3963 Comm: syz-executor228 Not tainted 5.15.126-syzkaller-00092-g24c4de4069cb #0 [ 44.851714][ T3963] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 44.853828][ T3963] Call trace: [ 44.854515][ T3963] dump_backtrace+0x0/0x530 [ 44.855434][ T3963] show_stack+0x2c/0x3c [ 44.856371][ T3963] dump_stack_lvl+0x108/0x170 [ 44.857331][ T3963] dump_stack+0x1c/0x58 [ 44.858284][ T3963] ___might_sleep+0x380/0x4dc [ 44.859336][ T3963] __might_sleep+0x98/0xf0 [ 44.860350][ T3963] slab_pre_alloc_hook+0x58/0xe8 [ 44.861404][ T3963] __kmalloc_node+0xbc/0x5b8 [ 44.862410][ T3963] kvmalloc_node+0x88/0x204 [ 44.863357][ T3963] get_dist_table+0x9c/0x2a4 [ 44.864373][ T3963] netem_change+0x7cc/0x1a90 [ 44.865345][ T3963] netem_init+0x54/0xb8 [ 44.866206][ T3963] qdisc_create+0x6fc/0xf44 [ 44.867187][ T3963] tc_modify_qdisc+0x8dc/0x1344 [ 44.868289][ T3963] rtnetlink_rcv_msg+0xa74/0xdac [ 44.869327][ T3963] netlink_rcv_skb+0x20c/0x3b8 [ 44.870359][ T3963] rtnetlink_rcv+0x28/0x38 [ 44.871380][ T3963] netlink_unicast+0x664/0x938 [ 44.872406][ T3963] netlink_sendmsg+0x844/0xb38 [ 44.873470][ T3963] ____sys_sendmsg+0x584/0x870 [ 44.874534][ T3963] ___sys_sendmsg+0x214/0x294 [ 44.875511][ T3963] __arm64_sys_sendmsg+0x1ac/0x25c [ 44.876619][ T3963] invoke_syscall+0x98/0x2b8 [ 44.877608][ T3963] el0_svc_common+0x138/0x258 [ 44.878594][ T3963] do_el0_svc+0x58/0x14c [ 44.879471][ T3963] el0_svc+0x7c/0x1f0 [ 44.880387][ T3963] el0t_64_sync_handler+0x84/0xe4 [ 44.881520][ T3963] el0t_64_sync+0x1a0/0x1a4 [ 44.882573][ T3963] [ 44.883041][ T3963] ============================================ [ 44.884409][ T3963] WARNING: possible recursive locking detected [ 44.885765][ T3963] 5.15.126-syzkaller-00092-g24c4de4069cb #0 Tainted: G W [ 44.887587][ T3963] -------------------------------------------- [ 44.888970][ T3963] syz-executor228/3963 is trying to acquire lock: [ 44.890425][ T3963] ffff0000dbdf7108 (&sch->q.lock){+...}-{2:2}, at: get_dist_table+0x1f0/0x2a4 [ 44.892296][ T3963] [ 44.892296][ T3963] but task is already holding lock: [ 44.893816][ T3963] ffff0000dbdf7108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 44.895844][ T3963] [ 44.895844][ T3963] other info that might help us debug this: [ 44.897614][ T3963] Possible unsafe locking scenario: [ 44.897614][ T3963] [ 44.899220][ T3963] CPU0 [ 44.899949][ T3963] ---- [ 44.900675][ T3963] lock(&sch->q.lock); [ 44.901502][ T3963] lock(&sch->q.lock); [ 44.902413][ T3963] [ 44.902413][ T3963] *** DEADLOCK *** [ 44.902413][ T3963] [ 44.904109][ T3963] May be due to missing lock nesting notation [ 44.904109][ T3963] [ 44.905954][ T3963] 2 locks held by syz-executor228/3963: [ 44.907124][ T3963] #0: ffff8000169e74a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 44.909195][ T3963] #1: ffff0000dbdf7108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 44.911235][ T3963] [ 44.911235][ T3963] stack backtrace: [ 44.912437][ T3963] CPU: 0 PID: 3963 Comm: syz-executor228 Tainted: G W 5.15.126-syzkaller-00092-g24c4de4069cb #0 [ 44.915088][ T3963] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 44.917226][ T3963] Call trace: [ 44.917916][ T3963] dump_backtrace+0x0/0x530 [ 44.918944][ T3963] show_stack+0x2c/0x3c [ 44.919827][ T3963] dump_stack_lvl+0x108/0x170 [ 44.920840][ T3963] dump_stack+0x1c/0x58 [ 44.921720][ T3963] __lock_acquire+0x62b4/0x7620 [ 44.922849][ T3963] lock_acquire+0x240/0x77c [ 44.923834][ T3963] _raw_spin_lock_bh+0x124/0x1c4 [ 44.924929][ T3963] get_dist_table+0x1f0/0x2a4 [ 44.925963][ T3963] netem_change+0x7cc/0x1a90 [ 44.926979][ T3963] netem_init+0x54/0xb8 [ 44.927886][ T3963] qdisc_create+0x6fc/0xf44 [ 44.928831][ T3963] tc_modify_qdisc+0x8dc/0x1344 [ 44.929882][ T3963] rtnetlink_rcv_msg+0xa74/0xdac [ 44.930976][ T3963] netlink_rcv_skb+0x20c/0x3b8 [ 44.931997][ T3963] rtnetlink_rcv+0x28/0x38 [ 44.932973][ T3963] netlink_unicast+0x664/0x938 [ 44.934000][ T3963] netlink_sendmsg+0x844/0xb38 [ 44.935056][ T3963] ____sys_sendmsg+0x584/0x870 [ 44.936072][ T3963] ___sys_sendmsg+0x214/0x294 [ 44.937113][ T3963] __arm64_sys_sendmsg+0x1ac/0x25c [ 44.938195][ T3963] invoke_syscall+0x98/0x2b8 [ 44.939153][ T3963] el0_svc_common+0x138/0x258 [ 44.940131][ T3963] do_el0_svc+0x58/0x14c [ 44.941029][ T3963] el0_svc+0x7c/0x1f0 [ 44.941867][ T3963] el0t_64_sync_handler+0x84/0xe4 [ 44.942950][ T3963] el0t_64_sync+0x1a0/0x1a4