Warning: Permanently added '10.128.10.43' (ED25519) to the list of known hosts. executing program [ 39.038419][ T3968] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:209 [ 39.041217][ T3968] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3968, name: syz-executor328 [ 39.043615][ T3968] 2 locks held by syz-executor328/3968: [ 39.045043][ T3968] #0: ffff8000169e74a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 39.047519][ T3968] #1: ffff0000c806a108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 39.050171][ T3968] Preemption disabled at: [ 39.050183][ T3968] [] netem_change+0x22c/0x1a90 [ 39.052917][ T3968] CPU: 0 PID: 3968 Comm: syz-executor328 Not tainted 5.15.126-syzkaller-00092-g24c4de4069cb #0 [ 39.055519][ T3968] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 39.058079][ T3968] Call trace: [ 39.058907][ T3968] dump_backtrace+0x0/0x530 [ 39.060099][ T3968] show_stack+0x2c/0x3c [ 39.061155][ T3968] dump_stack_lvl+0x108/0x170 [ 39.062343][ T3968] dump_stack+0x1c/0x58 [ 39.063420][ T3968] ___might_sleep+0x380/0x4dc [ 39.064617][ T3968] __might_sleep+0x98/0xf0 [ 39.065769][ T3968] slab_pre_alloc_hook+0x58/0xe8 [ 39.067048][ T3968] __kmalloc_node+0xbc/0x5b8 [ 39.068241][ T3968] kvmalloc_node+0x88/0x204 [ 39.069445][ T3968] get_dist_table+0x9c/0x2a4 [ 39.070628][ T3968] netem_change+0x820/0x1a90 [ 39.071810][ T3968] netem_init+0x54/0xb8 [ 39.072884][ T3968] qdisc_create+0x6fc/0xf44 [ 39.074037][ T3968] tc_modify_qdisc+0x8dc/0x1344 [ 39.075334][ T3968] rtnetlink_rcv_msg+0xa74/0xdac [ 39.076648][ T3968] netlink_rcv_skb+0x20c/0x3b8 [ 39.077871][ T3968] rtnetlink_rcv+0x28/0x38 [ 39.079040][ T3968] netlink_unicast+0x664/0x938 [ 39.080335][ T3968] netlink_sendmsg+0x844/0xb38 [ 39.081577][ T3968] ____sys_sendmsg+0x584/0x870 [ 39.082817][ T3968] ___sys_sendmsg+0x214/0x294 [ 39.084026][ T3968] __arm64_sys_sendmsg+0x1ac/0x25c [ 39.085351][ T3968] invoke_syscall+0x98/0x2b8 [ 39.086550][ T3968] el0_svc_common+0x138/0x258 [ 39.087770][ T3968] do_el0_svc+0x58/0x14c [ 39.088863][ T3968] el0_svc+0x7c/0x1f0 [ 39.089857][ T3968] el0t_64_sync_handler+0x84/0xe4 [ 39.091177][ T3968] el0t_64_sync+0x1a0/0x1a4 [ 39.092448][ T3968] [ 39.093015][ T3968] ============================================ [ 39.094559][ T3968] WARNING: possible recursive locking detected [ 39.096034][ T3968] 5.15.126-syzkaller-00092-g24c4de4069cb #0 Tainted: G W [ 39.098148][ T3968] -------------------------------------------- [ 39.099697][ T3968] syz-executor328/3968 is trying to acquire lock: [ 39.101341][ T3968] ffff0000c806a108 (&sch->q.lock){+...}-{2:2}, at: get_dist_table+0x1f0/0x2a4 [ 39.103648][ T3968] [ 39.103648][ T3968] but task is already holding lock: [ 39.105537][ T3968] ffff0000c806a108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 39.107766][ T3968] [ 39.107766][ T3968] other info that might help us debug this: [ 39.109891][ T3968] Possible unsafe locking scenario: [ 39.109891][ T3968] [ 39.111815][ T3968] CPU0 [ 39.112664][ T3968] ---- [ 39.113513][ T3968] lock(&sch->q.lock); [ 39.114581][ T3968] lock(&sch->q.lock); [ 39.115666][ T3968] [ 39.115666][ T3968] *** DEADLOCK *** [ 39.115666][ T3968] [ 39.117760][ T3968] May be due to missing lock nesting notation [ 39.117760][ T3968] [ 39.119895][ T3968] 2 locks held by syz-executor328/3968: [ 39.121314][ T3968] #0: ffff8000169e74a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 39.123731][ T3968] #1: ffff0000c806a108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 39.126136][ T3968] [ 39.126136][ T3968] stack backtrace: [ 39.127671][ T3968] CPU: 0 PID: 3968 Comm: syz-executor328 Tainted: G W 5.15.126-syzkaller-00092-g24c4de4069cb #0 [ 39.130660][ T3968] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 39.133226][ T3968] Call trace: [ 39.134118][ T3968] dump_backtrace+0x0/0x530 [ 39.135283][ T3968] show_stack+0x2c/0x3c [ 39.136377][ T3968] dump_stack_lvl+0x108/0x170 [ 39.137577][ T3968] dump_stack+0x1c/0x58 [ 39.138684][ T3968] __lock_acquire+0x62b4/0x7620 [ 39.139925][ T3968] lock_acquire+0x240/0x77c [ 39.141102][ T3968] _raw_spin_lock_bh+0x124/0x1c4 [ 39.142375][ T3968] get_dist_table+0x1f0/0x2a4 [ 39.143573][ T3968] netem_change+0x820/0x1a90 [ 39.144798][ T3968] netem_init+0x54/0xb8 [ 39.145885][ T3968] qdisc_create+0x6fc/0xf44 [ 39.147047][ T3968] tc_modify_qdisc+0x8dc/0x1344 [ 39.148317][ T3968] rtnetlink_rcv_msg+0xa74/0xdac [ 39.149626][ T3968] netlink_rcv_skb+0x20c/0x3b8 [ 39.150856][ T3968] rtnetlink_rcv+0x28/0x38 [ 39.151970][ T3968] netlink_unicast+0x664/0x938 [ 39.153209][ T3968] netlink_sendmsg+0x844/0xb38 [ 39.154428][ T3968] ____sys_sendmsg+0x584/0x870 [ 39.155649][ T3968] ___sys_sendmsg+0x214/0x294 [ 39.156832][ T3968] __arm64_sys_sendmsg+0x1ac/0x25c [ 39.158146][ T3968] invoke_syscall+0x98/0x2b8 [ 39.159318][ T3968] el0_svc_common+0x138/0x258 [ 39.160532][ T3968] do_el0_svc+0x58/0x14c [ 39.161654][ T3968] el0_svc+0x7c/0x1f0 [ 39.162703][ T3968] el0t_64_sync_handler+0x84/0xe4 [ 39.163987][ T3968] el0t_64_sync+0x1a0/0x1a4