Warning: Permanently added '10.128.1.88' (ED25519) to the list of known hosts. executing program [ 42.050074][ T3962] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:209 [ 42.052689][ T3962] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3962, name: syz-executor970 [ 42.055105][ T3962] 2 locks held by syz-executor970/3962: [ 42.056532][ T3962] #0: ffff8000169e74a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 42.059032][ T3962] #1: ffff0000c8aef908 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 42.061466][ T3962] Preemption disabled at: [ 42.061478][ T3962] [] netem_change+0x22c/0x1a90 [ 42.064090][ T3962] CPU: 1 PID: 3962 Comm: syz-executor970 Not tainted 5.15.126-syzkaller-00092-g24c4de4069cb #0 [ 42.066813][ T3962] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 42.069524][ T3962] Call trace: [ 42.070351][ T3962] dump_backtrace+0x0/0x530 [ 42.071528][ T3962] show_stack+0x2c/0x3c [ 42.072635][ T3962] dump_stack_lvl+0x108/0x170 [ 42.073822][ T3962] dump_stack+0x1c/0x58 [ 42.074892][ T3962] ___might_sleep+0x380/0x4dc [ 42.076135][ T3962] __might_sleep+0x98/0xf0 [ 42.077274][ T3962] slab_pre_alloc_hook+0x58/0xe8 [ 42.078599][ T3962] __kmalloc_node+0xbc/0x5b8 [ 42.079772][ T3962] kvmalloc_node+0x88/0x204 [ 42.080945][ T3962] get_dist_table+0x9c/0x2a4 [ 42.082142][ T3962] netem_change+0x7cc/0x1a90 [ 42.083353][ T3962] netem_init+0x54/0xb8 [ 42.084429][ T3962] qdisc_create+0x6fc/0xf44 [ 42.085605][ T3962] tc_modify_qdisc+0x8dc/0x1344 [ 42.086892][ T3962] rtnetlink_rcv_msg+0xa74/0xdac [ 42.088157][ T3962] netlink_rcv_skb+0x20c/0x3b8 [ 42.089400][ T3962] rtnetlink_rcv+0x28/0x38 [ 42.090538][ T3962] netlink_unicast+0x664/0x938 [ 42.091748][ T3962] netlink_sendmsg+0x844/0xb38 [ 42.092959][ T3962] ____sys_sendmsg+0x584/0x870 [ 42.094203][ T3962] ___sys_sendmsg+0x214/0x294 [ 42.095420][ T3962] __arm64_sys_sendmsg+0x1ac/0x25c [ 42.096738][ T3962] invoke_syscall+0x98/0x2b8 [ 42.097929][ T3962] el0_svc_common+0x138/0x258 [ 42.099164][ T3962] do_el0_svc+0x58/0x14c [ 42.100280][ T3962] el0_svc+0x7c/0x1f0 [ 42.101327][ T3962] el0t_64_sync_handler+0x84/0xe4 [ 42.102621][ T3962] el0t_64_sync+0x1a0/0x1a4 [ 42.103847][ T3962] [ 42.104395][ T3962] ============================================ [ 42.105976][ T3962] WARNING: possible recursive locking detected [ 42.107582][ T3962] 5.15.126-syzkaller-00092-g24c4de4069cb #0 Tainted: G W [ 42.109729][ T3962] -------------------------------------------- [ 42.111266][ T3962] syz-executor970/3962 is trying to acquire lock: [ 42.112939][ T3962] ffff0000c8aef908 (&sch->q.lock){+...}-{2:2}, at: get_dist_table+0x1f0/0x2a4 [ 42.115261][ T3962] [ 42.115261][ T3962] but task is already holding lock: [ 42.117209][ T3962] ffff0000c8aef908 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 42.119533][ T3962] [ 42.119533][ T3962] other info that might help us debug this: [ 42.121584][ T3962] Possible unsafe locking scenario: [ 42.121584][ T3962] [ 42.123477][ T3962] CPU0 [ 42.124311][ T3962] ---- [ 42.125160][ T3962] lock(&sch->q.lock); [ 42.126234][ T3962] lock(&sch->q.lock); [ 42.127290][ T3962] [ 42.127290][ T3962] *** DEADLOCK *** [ 42.127290][ T3962] [ 42.129380][ T3962] May be due to missing lock nesting notation [ 42.129380][ T3962] [ 42.131531][ T3962] 2 locks held by syz-executor970/3962: [ 42.132983][ T3962] #0: ffff8000169e74a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 42.135510][ T3962] #1: ffff0000c8aef908 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 42.137930][ T3962] [ 42.137930][ T3962] stack backtrace: [ 42.139449][ T3962] CPU: 1 PID: 3962 Comm: syz-executor970 Tainted: G W 5.15.126-syzkaller-00092-g24c4de4069cb #0 [ 42.142421][ T3962] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 42.145073][ T3962] Call trace: [ 42.145902][ T3962] dump_backtrace+0x0/0x530 [ 42.147085][ T3962] show_stack+0x2c/0x3c [ 42.148131][ T3962] dump_stack_lvl+0x108/0x170 [ 42.149336][ T3962] dump_stack+0x1c/0x58 [ 42.150399][ T3962] __lock_acquire+0x62b4/0x7620 [ 42.151655][ T3962] lock_acquire+0x240/0x77c [ 42.152832][ T3962] _raw_spin_lock_bh+0x124/0x1c4 [ 42.154116][ T3962] get_dist_table+0x1f0/0x2a4 [ 42.155313][ T3962] netem_change+0x7cc/0x1a90 [ 42.156530][ T3962] netem_init+0x54/0xb8 [ 42.157596][ T3962] qdisc_create+0x6fc/0xf44 [ 42.158781][ T3962] tc_modify_qdisc+0x8dc/0x1344 [ 42.160040][ T3962] rtnetlink_rcv_msg+0xa74/0xdac [ 42.161304][ T3962] netlink_rcv_skb+0x20c/0x3b8 [ 42.162555][ T3962] rtnetlink_rcv+0x28/0x38 [ 42.163678][ T3962] netlink_unicast+0x664/0x938 [ 42.164887][ T3962] netlink_sendmsg+0x844/0xb38 [ 42.166174][ T3962] ____sys_sendmsg+0x584/0x870 [ 42.167358][ T3962] ___sys_sendmsg+0x214/0x294 [ 42.168591][ T3962] __arm64_sys_sendmsg+0x1ac/0x25c [ 42.169926][ T3962] invoke_syscall+0x98/0x2b8 [ 42.171104][ T3962] el0_svc_common+0x138/0x258 [ 42.172288][ T3962] do_el0_svc+0x58/0x14c [ 42.173411][ T3962] el0_svc+0x7c/0x1f0 [ 42.174456][ T3962] el0t_64_sync_handler+0x84/0xe4 [ 42.175907][ T3962] el0t_64_sync+0x1a0/0x1a4