Warning: Permanently added '10.128.0.8' (ED25519) to the list of known hosts. executing program [ 41.642007][ T3961] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:209 [ 41.644621][ T3961] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3961, name: syz-executor114 [ 41.647212][ T3961] 2 locks held by syz-executor114/3961: [ 41.648711][ T3961] #0: ffff8000169e7128 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 41.651175][ T3961] #1: ffff0000d4b84108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 41.653601][ T3961] Preemption disabled at: [ 41.653613][ T3961] [] netem_change+0x22c/0x1a90 [ 41.656443][ T3961] CPU: 1 PID: 3961 Comm: syz-executor114 Not tainted 5.15.123-syzkaller #0 [ 41.658707][ T3961] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 41.661312][ T3961] Call trace: [ 41.662144][ T3961] dump_backtrace+0x0/0x530 [ 41.663346][ T3961] show_stack+0x2c/0x3c [ 41.664346][ T3961] dump_stack_lvl+0x108/0x170 [ 41.665543][ T3961] dump_stack+0x1c/0x58 [ 41.666655][ T3961] ___might_sleep+0x380/0x4dc [ 41.667972][ T3961] __might_sleep+0x98/0xf0 [ 41.669151][ T3961] slab_pre_alloc_hook+0x58/0xe8 [ 41.670498][ T3961] __kmalloc_node+0xbc/0x5b8 [ 41.671715][ T3961] kvmalloc_node+0x88/0x204 [ 41.672869][ T3961] get_dist_table+0x9c/0x2a4 [ 41.674062][ T3961] netem_change+0x7cc/0x1a90 [ 41.675243][ T3961] netem_init+0x54/0xb8 [ 41.676330][ T3961] qdisc_create+0x6fc/0xf44 [ 41.677523][ T3961] tc_modify_qdisc+0x8dc/0x1344 [ 41.678814][ T3961] rtnetlink_rcv_msg+0xa74/0xdac [ 41.680132][ T3961] netlink_rcv_skb+0x20c/0x3b8 [ 41.681393][ T3961] rtnetlink_rcv+0x28/0x38 [ 41.682539][ T3961] netlink_unicast+0x664/0x938 [ 41.683798][ T3961] netlink_sendmsg+0x844/0xb38 [ 41.685096][ T3961] ____sys_sendmsg+0x584/0x870 [ 41.686347][ T3961] ___sys_sendmsg+0x214/0x294 [ 41.687628][ T3961] __arm64_sys_sendmsg+0x1ac/0x25c [ 41.689002][ T3961] invoke_syscall+0x98/0x2b8 [ 41.690188][ T3961] el0_svc_common+0x138/0x258 [ 41.691428][ T3961] do_el0_svc+0x58/0x14c [ 41.692526][ T3961] el0_svc+0x7c/0x1f0 [ 41.693587][ T3961] el0t_64_sync_handler+0x84/0xe4 [ 41.694953][ T3961] el0t_64_sync+0x1a0/0x1a4 [ 41.696231][ T3961] [ 41.696855][ T3961] ============================================ [ 41.698446][ T3961] WARNING: possible recursive locking detected [ 41.700090][ T3961] 5.15.123-syzkaller #0 Tainted: G W [ 41.701827][ T3961] -------------------------------------------- [ 41.703447][ T3961] syz-executor114/3961 is trying to acquire lock: [ 41.705194][ T3961] ffff0000d4b84108 (&sch->q.lock){+...}-{2:2}, at: get_dist_table+0x1f0/0x2a4 [ 41.707598][ T3961] [ 41.707598][ T3961] but task is already holding lock: [ 41.709516][ T3961] ffff0000d4b84108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 41.711856][ T3961] [ 41.711856][ T3961] other info that might help us debug this: [ 41.714038][ T3961] Possible unsafe locking scenario: [ 41.714038][ T3961] [ 41.715981][ T3961] CPU0 [ 41.716892][ T3961] ---- [ 41.717747][ T3961] lock(&sch->q.lock); [ 41.718863][ T3961] lock(&sch->q.lock); [ 41.719951][ T3961] [ 41.719951][ T3961] *** DEADLOCK *** [ 41.719951][ T3961] [ 41.722059][ T3961] May be due to missing lock nesting notation [ 41.722059][ T3961] [ 41.724211][ T3961] 2 locks held by syz-executor114/3961: [ 41.725705][ T3961] #0: ffff8000169e7128 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 41.728196][ T3961] #1: ffff0000d4b84108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 41.730649][ T3961] [ 41.730649][ T3961] stack backtrace: [ 41.732157][ T3961] CPU: 1 PID: 3961 Comm: syz-executor114 Tainted: G W 5.15.123-syzkaller #0 [ 41.734815][ T3961] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 41.737490][ T3961] Call trace: [ 41.738380][ T3961] dump_backtrace+0x0/0x530 [ 41.739602][ T3961] show_stack+0x2c/0x3c [ 41.740695][ T3961] dump_stack_lvl+0x108/0x170 [ 41.741876][ T3961] dump_stack+0x1c/0x58 [ 41.742951][ T3961] __lock_acquire+0x62b4/0x7620 [ 41.744208][ T3961] lock_acquire+0x240/0x77c [ 41.745400][ T3961] _raw_spin_lock_bh+0x124/0x1c4 [ 41.746685][ T3961] get_dist_table+0x1f0/0x2a4 [ 41.747900][ T3961] netem_change+0x7cc/0x1a90 [ 41.749110][ T3961] netem_init+0x54/0xb8 [ 41.750190][ T3961] qdisc_create+0x6fc/0xf44 [ 41.751390][ T3961] tc_modify_qdisc+0x8dc/0x1344 [ 41.752699][ T3961] rtnetlink_rcv_msg+0xa74/0xdac [ 41.754006][ T3961] netlink_rcv_skb+0x20c/0x3b8 [ 41.755254][ T3961] rtnetlink_rcv+0x28/0x38 [ 41.756441][ T3961] netlink_unicast+0x664/0x938 [ 41.757673][ T3961] netlink_sendmsg+0x844/0xb38 [ 41.758940][ T3961] ____sys_sendmsg+0x584/0x870 [ 41.760157][ T3961] ___sys_sendmsg+0x214/0x294 [ 41.761362][ T3961] __arm64_sys_sendmsg+0x1ac/0x25c [ 41.762695][ T3961] invoke_syscall+0x98/0x2b8 [ 41.763892][ T3961] el0_svc_common+0x138/0x258 [ 41.765142][ T3961] do_el0_svc+0x58/0x14c [ 41.766244][ T3961] el0_svc+0x7c/0x1f0 [ 41.767296][ T3961] el0t_64_sync_handler+0x84/0xe4 [ 41.768606][ T3961] el0t_64_sync+0x1a0/0x1a4