Warning: Permanently added '10.128.1.111' (ED25519) to the list of known hosts. executing program [ 37.632125][ T3961] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:209 [ 37.634376][ T3961] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3961, name: syz-executor630 [ 37.636557][ T3961] 2 locks held by syz-executor630/3961: [ 37.637782][ T3961] #0: ffff8000169e7128 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 37.639796][ T3961] #1: ffff0000c92ae108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 37.641769][ T3961] Preemption disabled at: [ 37.641782][ T3961] [] netem_change+0x22c/0x1a90 [ 37.644040][ T3961] CPU: 1 PID: 3961 Comm: syz-executor630 Not tainted 5.15.123-syzkaller #0 [ 37.645970][ T3961] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 37.648203][ T3961] Call trace: [ 37.648888][ T3961] dump_backtrace+0x0/0x530 [ 37.649825][ T3961] show_stack+0x2c/0x3c [ 37.650717][ T3961] dump_stack_lvl+0x108/0x170 [ 37.651696][ T3961] dump_stack+0x1c/0x58 [ 37.652611][ T3961] ___might_sleep+0x380/0x4dc [ 37.653604][ T3961] __might_sleep+0x98/0xf0 [ 37.654500][ T3961] slab_pre_alloc_hook+0x58/0xe8 [ 37.655535][ T3961] __kmalloc_node+0xbc/0x5b8 [ 37.656513][ T3961] kvmalloc_node+0x88/0x204 [ 37.657434][ T3961] get_dist_table+0x9c/0x2a4 [ 37.658398][ T3961] netem_change+0x820/0x1a90 [ 37.659421][ T3961] netem_init+0x54/0xb8 [ 37.660237][ T3961] qdisc_create+0x6fc/0xf44 [ 37.661125][ T3961] tc_modify_qdisc+0x8dc/0x1344 [ 37.662199][ T3961] rtnetlink_rcv_msg+0xa74/0xdac [ 37.663231][ T3961] netlink_rcv_skb+0x20c/0x3b8 [ 37.664234][ T3961] rtnetlink_rcv+0x28/0x38 [ 37.665168][ T3961] netlink_unicast+0x664/0x938 [ 37.666201][ T3961] netlink_sendmsg+0x844/0xb38 [ 37.667194][ T3961] ____sys_sendmsg+0x584/0x870 [ 37.668223][ T3961] ___sys_sendmsg+0x214/0x294 [ 37.669310][ T3961] __arm64_sys_sendmsg+0x1ac/0x25c [ 37.670379][ T3961] invoke_syscall+0x98/0x2b8 [ 37.671384][ T3961] el0_svc_common+0x138/0x258 [ 37.672389][ T3961] do_el0_svc+0x58/0x14c [ 37.673326][ T3961] el0_svc+0x7c/0x1f0 [ 37.674207][ T3961] el0t_64_sync_handler+0x84/0xe4 [ 37.675198][ T3961] el0t_64_sync+0x1a0/0x1a4 [ 37.676287][ T3961] [ 37.676784][ T3961] ============================================ [ 37.678009][ T3961] WARNING: possible recursive locking detected [ 37.679293][ T3961] 5.15.123-syzkaller #0 Tainted: G W [ 37.680637][ T3961] -------------------------------------------- [ 37.681929][ T3961] syz-executor630/3961 is trying to acquire lock: [ 37.683220][ T3961] ffff0000c92ae108 (&sch->q.lock){+...}-{2:2}, at: get_dist_table+0x1f0/0x2a4 [ 37.685097][ T3961] [ 37.685097][ T3961] but task is already holding lock: [ 37.686639][ T3961] ffff0000c92ae108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 37.688579][ T3961] [ 37.688579][ T3961] other info that might help us debug this: [ 37.690206][ T3961] Possible unsafe locking scenario: [ 37.690206][ T3961] [ 37.691829][ T3961] CPU0 [ 37.692528][ T3961] ---- [ 37.693197][ T3961] lock(&sch->q.lock); [ 37.694152][ T3961] lock(&sch->q.lock); [ 37.695042][ T3961] [ 37.695042][ T3961] *** DEADLOCK *** [ 37.695042][ T3961] [ 37.696846][ T3961] May be due to missing lock nesting notation [ 37.696846][ T3961] [ 37.698686][ T3961] 2 locks held by syz-executor630/3961: [ 37.699944][ T3961] #0: ffff8000169e7128 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 37.701983][ T3961] #1: ffff0000c92ae108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 37.703986][ T3961] [ 37.703986][ T3961] stack backtrace: [ 37.705221][ T3961] CPU: 1 PID: 3961 Comm: syz-executor630 Tainted: G W 5.15.123-syzkaller #0 [ 37.707324][ T3961] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 37.709473][ T3961] Call trace: [ 37.710181][ T3961] dump_backtrace+0x0/0x530 [ 37.711093][ T3961] show_stack+0x2c/0x3c [ 37.711986][ T3961] dump_stack_lvl+0x108/0x170 [ 37.712946][ T3961] dump_stack+0x1c/0x58 [ 37.713888][ T3961] __lock_acquire+0x62b4/0x7620 [ 37.714885][ T3961] lock_acquire+0x240/0x77c [ 37.715829][ T3961] _raw_spin_lock_bh+0x124/0x1c4 [ 37.716919][ T3961] get_dist_table+0x1f0/0x2a4 [ 37.717976][ T3961] netem_change+0x820/0x1a90 [ 37.718929][ T3961] netem_init+0x54/0xb8 [ 37.719810][ T3961] qdisc_create+0x6fc/0xf44 [ 37.720813][ T3961] tc_modify_qdisc+0x8dc/0x1344 [ 37.721889][ T3961] rtnetlink_rcv_msg+0xa74/0xdac [ 37.722920][ T3961] netlink_rcv_skb+0x20c/0x3b8 [ 37.724030][ T3961] rtnetlink_rcv+0x28/0x38 [ 37.725001][ T3961] netlink_unicast+0x664/0x938 [ 37.725983][ T3961] netlink_sendmsg+0x844/0xb38 [ 37.727072][ T3961] ____sys_sendmsg+0x584/0x870 [ 37.728087][ T3961] ___sys_sendmsg+0x214/0x294 [ 37.729150][ T3961] __arm64_sys_sendmsg+0x1ac/0x25c [ 37.730218][ T3961] invoke_syscall+0x98/0x2b8 [ 37.731197][ T3961] el0_svc_common+0x138/0x258 [ 37.732215][ T3961] do_el0_svc+0x58/0x14c [ 37.733218][ T3961] el0_svc+0x7c/0x1f0 [ 37.734028][ T3961] el0t_64_sync_handler+0x84/0xe4 [ 37.735153][ T3961] el0t_64_sync+0x1a0/0x1a4