Warning: Permanently added '10.128.1.142' (ED25519) to the list of known hosts. executing program [ 47.328009][ T3962] netlink: 60 bytes leftover after parsing attributes in process `syz-executor734'. [ 47.330840][ T3962] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:209 [ 47.333346][ T3962] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3962, name: syz-executor734 [ 47.335812][ T3962] 2 locks held by syz-executor734/3962: [ 47.337303][ T3962] #0: ffff8000169e7428 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 47.339783][ T3962] #1: ffff0000c7ce5908 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 47.342241][ T3962] Preemption disabled at: [ 47.342253][ T3962] [] netem_change+0x22c/0x1a90 [ 47.344964][ T3962] CPU: 0 PID: 3962 Comm: syz-executor734 Not tainted 5.15.125-syzkaller #0 [ 47.347209][ T3962] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 47.349799][ T3962] Call trace: [ 47.350652][ T3962] dump_backtrace+0x0/0x530 [ 47.351785][ T3962] show_stack+0x2c/0x3c [ 47.352901][ T3962] dump_stack_lvl+0x108/0x170 [ 47.354145][ T3962] dump_stack+0x1c/0x58 [ 47.355312][ T3962] ___might_sleep+0x380/0x4dc [ 47.356579][ T3962] __might_sleep+0x98/0xf0 [ 47.357768][ T3962] slab_pre_alloc_hook+0x58/0xe8 [ 47.359108][ T3962] __kmalloc_node+0xbc/0x5b8 [ 47.360304][ T3962] kvmalloc_node+0x88/0x204 [ 47.361437][ T3962] get_dist_table+0x9c/0x2a4 [ 47.362619][ T3962] netem_change+0x820/0x1a90 [ 47.363785][ T3962] netem_init+0x54/0xb8 [ 47.364851][ T3962] qdisc_create+0x6fc/0xf44 [ 47.366005][ T3962] tc_modify_qdisc+0x8dc/0x1344 [ 47.367336][ T3962] rtnetlink_rcv_msg+0xa74/0xdac [ 47.368667][ T3962] netlink_rcv_skb+0x20c/0x3b8 [ 47.369963][ T3962] rtnetlink_rcv+0x28/0x38 [ 47.371136][ T3962] netlink_unicast+0x664/0x938 [ 47.372375][ T3962] netlink_sendmsg+0x844/0xb38 [ 47.373656][ T3962] ____sys_sendmsg+0x584/0x870 [ 47.374863][ T3962] ___sys_sendmsg+0x214/0x294 [ 47.376048][ T3962] __arm64_sys_sendmsg+0x1ac/0x25c [ 47.377437][ T3962] invoke_syscall+0x98/0x2b8 [ 47.378670][ T3962] el0_svc_common+0x138/0x258 [ 47.379915][ T3962] do_el0_svc+0x58/0x14c [ 47.381066][ T3962] el0_svc+0x7c/0x1f0 [ 47.382161][ T3962] el0t_64_sync_handler+0x84/0xe4 [ 47.383523][ T3962] el0t_64_sync+0x1a0/0x1a4 [ 47.384802][ T3962] [ 47.385396][ T3962] ============================================ [ 47.387063][ T3962] WARNING: possible recursive locking detected [ 47.388634][ T3962] 5.15.125-syzkaller #0 Tainted: G W [ 47.390341][ T3962] -------------------------------------------- [ 47.391914][ T3962] syz-executor734/3962 is trying to acquire lock: [ 47.393613][ T3962] ffff0000c7ce5908 (&sch->q.lock){+...}-{2:2}, at: get_dist_table+0x1f0/0x2a4 [ 47.395938][ T3962] [ 47.395938][ T3962] but task is already holding lock: [ 47.397828][ T3962] ffff0000c7ce5908 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 47.400192][ T3962] [ 47.400192][ T3962] other info that might help us debug this: [ 47.402352][ T3962] Possible unsafe locking scenario: [ 47.402352][ T3962] [ 47.404424][ T3962] CPU0 [ 47.405327][ T3962] ---- [ 47.406190][ T3962] lock(&sch->q.lock); [ 47.407265][ T3962] lock(&sch->q.lock); [ 47.408396][ T3962] [ 47.408396][ T3962] *** DEADLOCK *** [ 47.408396][ T3962] [ 47.410597][ T3962] May be due to missing lock nesting notation [ 47.410597][ T3962] [ 47.412848][ T3962] 2 locks held by syz-executor734/3962: [ 47.414305][ T3962] #0: ffff8000169e7428 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 47.416867][ T3962] #1: ffff0000c7ce5908 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 47.419445][ T3962] [ 47.419445][ T3962] stack backtrace: [ 47.420933][ T3962] CPU: 0 PID: 3962 Comm: syz-executor734 Tainted: G W 5.15.125-syzkaller #0 [ 47.423591][ T3962] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 47.426222][ T3962] Call trace: [ 47.427105][ T3962] dump_backtrace+0x0/0x530 [ 47.428308][ T3962] show_stack+0x2c/0x3c [ 47.429449][ T3962] dump_stack_lvl+0x108/0x170 [ 47.430695][ T3962] dump_stack+0x1c/0x58 [ 47.431764][ T3962] __lock_acquire+0x62b4/0x7620 [ 47.433030][ T3962] lock_acquire+0x240/0x77c [ 47.434212][ T3962] _raw_spin_lock_bh+0x124/0x1c4 [ 47.435471][ T3962] get_dist_table+0x1f0/0x2a4 [ 47.436685][ T3962] netem_change+0x820/0x1a90 [ 47.437878][ T3962] netem_init+0x54/0xb8 [ 47.439015][ T3962] qdisc_create+0x6fc/0xf44 [ 47.440262][ T3962] tc_modify_qdisc+0x8dc/0x1344 [ 47.441533][ T3962] rtnetlink_rcv_msg+0xa74/0xdac [ 47.442863][ T3962] netlink_rcv_skb+0x20c/0x3b8 [ 47.444165][ T3962] rtnetlink_rcv+0x28/0x38 [ 47.445407][ T3962] netlink_unicast+0x664/0x938 [ 47.446707][ T3962] netlink_sendmsg+0x844/0xb38 [ 47.448017][ T3962] ____sys_sendmsg+0x584/0x870 [ 47.449333][ T3962] ___sys_sendmsg+0x214/0x294 [ 47.450587][ T3962] __arm64_sys_sendmsg+0x1ac/0x25c [ 47.451937][ T3962] invoke_syscall+0x98/0x2b8 [ 47.453125][ T3962] el0_svc_common+0x138/0x258 [ 47.454304][ T3962] do_el0_svc+0x58/0x14c [ 47.455355][ T3962] el0_svc+0x7c/0x1f0 [ 47.456412][ T3962] el0t_64_sync_handler+0x84/0xe4 [ 47.457673][ T3962] el0t_64_sync+0x1a0/0x1a4