Warning: Permanently added '10.128.0.201' (ED25519) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 52.356367][ T3625] [ 52.358733][ T3625] ====================================================== [ 52.365757][ T3625] WARNING: possible circular locking dependency detected [ 52.372767][ T3625] 5.15.158-syzkaller #0 Not tainted [ 52.377949][ T3625] ------------------------------------------------------ [ 52.384949][ T3625] syz-executor141/3625 is trying to acquire lock: [ 52.391367][ T3625] ffff888012a00a28 (&p->pi_lock){-.-.}-{2:2}, at: try_to_wake_up+0xae/0x1300 [ 52.400188][ T3625] [ 52.400188][ T3625] but task is already holding lock: [ 52.407542][ T3625] ffff8880b9b35bb8 (lock#8){+.+.}-{2:2}, at: local_lock_acquire+0xd/0x170 [ 52.416071][ T3625] [ 52.416071][ T3625] which lock already depends on the new lock. [ 52.416071][ T3625] [ 52.426458][ T3625] [ 52.426458][ T3625] the existing dependency chain (in reverse order) is: [ 52.435456][ T3625] [ 52.435456][ T3625] -> #2 (lock#8){+.+.}-{2:2}: [ 52.442313][ T3625] lock_acquire+0x1db/0x4f0 [ 52.447330][ T3625] local_lock_acquire+0x29/0x170 [ 52.452803][ T3625] __mmap_lock_do_trace_acquire_returned+0x7c/0x340 [ 52.459923][ T3625] stack_map_get_build_id_offset+0x612/0x930 [ 52.466507][ T3625] __bpf_get_stack+0x495/0x570 [ 52.471967][ T3625] bpf_get_stack_raw_tp+0x1b2/0x220 [ 52.477676][ T3625] 0xffffffffa00309f2 [ 52.482188][ T3625] bpf_trace_run2+0x19e/0x340 [ 52.487379][ T3625] trace_tlb_flush+0xed/0x110 [ 52.492571][ T3625] switch_mm_irqs_off+0x748/0xa30 [ 52.498106][ T3625] __schedule+0x1167/0x45b0 [ 52.503130][ T3625] schedule+0x11b/0x1f0 [ 52.507828][ T3625] exit_to_user_mode_loop+0x44/0x130 [ 52.513628][ T3625] exit_to_user_mode_prepare+0xb1/0x140 [ 52.519709][ T3625] irqentry_exit_to_user_mode+0x5/0x30 [ 52.525771][ T3625] asm_sysvec_apic_timer_interrupt+0x16/0x20 [ 52.532265][ T3625] [ 52.532265][ T3625] -> #1 (&rq->__lock){-.-.}-{2:2}: [ 52.539562][ T3625] lock_acquire+0x1db/0x4f0 [ 52.544584][ T3625] _raw_spin_lock_nested+0x2d/0x40 [ 52.550213][ T3625] raw_spin_rq_lock_nested+0x26/0x140 [ 52.556099][ T3625] task_fork_fair+0x5d/0x350 [ 52.561203][ T3625] sched_cgroup_fork+0x2d3/0x330 [ 52.566655][ T3625] copy_process+0x224a/0x3ef0 [ 52.571846][ T3625] kernel_clone+0x210/0x960 [ 52.576858][ T3625] kernel_thread+0x168/0x1e0 [ 52.581961][ T3625] rest_init+0x21/0x330 [ 52.586629][ T3625] start_kernel+0x48c/0x540 [ 52.591658][ T3625] secondary_startup_64_no_verify+0xb1/0xbb [ 52.598068][ T3625] [ 52.598068][ T3625] -> #0 (&p->pi_lock){-.-.}-{2:2}: [ 52.605358][ T3625] validate_chain+0x1649/0x5930 [ 52.610722][ T3625] __lock_acquire+0x1295/0x1ff0 [ 52.616089][ T3625] lock_acquire+0x1db/0x4f0 [ 52.621104][ T3625] _raw_spin_lock_irqsave+0xd1/0x120 [ 52.626903][ T3625] try_to_wake_up+0xae/0x1300 [ 52.632095][ T3625] rcu_read_unlock_special+0x3aa/0x520 [ 52.638066][ T3625] __rcu_read_unlock+0x92/0x100 [ 52.643428][ T3625] put_memcg_path_buf+0xde/0x100 [ 52.648878][ T3625] __mmap_lock_do_trace_acquire_returned+0x12f/0x340 [ 52.656094][ T3625] exc_page_fault+0x59c/0x740 [ 52.661280][ T3625] asm_exc_page_fault+0x22/0x30 [ 52.666636][ T3625] [ 52.666636][ T3625] other info that might help us debug this: [ 52.666636][ T3625] [ 52.676852][ T3625] Chain exists of: [ 52.676852][ T3625] &p->pi_lock --> &rq->__lock --> lock#8 [ 52.676852][ T3625] [ 52.688404][ T3625] Possible unsafe locking scenario: [ 52.688404][ T3625] [ 52.695851][ T3625] CPU0 CPU1 [ 52.701201][ T3625] ---- ---- [ 52.706563][ T3625] lock(lock#8); [ 52.710193][ T3625] lock(&rq->__lock); [ 52.716767][ T3625] lock(lock#8); [ 52.723010][ T3625] lock(&p->pi_lock); [ 52.727175][ T3625] [ 52.727175][ T3625] *** DEADLOCK *** [ 52.727175][ T3625] [ 52.735314][ T3625] 3 locks held by syz-executor141/3625: [ 52.740856][ T3625] #0: ffff888078240f28 (&mm->mmap_lock){++++}-{3:3}, at: exc_page_fault+0x181/0x740 [ 52.750340][ T3625] #1: ffff8880b9b35bb8 (lock#8){+.+.}-{2:2}, at: local_lock_acquire+0xd/0x170 [ 52.759295][ T3625] #2: ffffffff8c91fae0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 [ 52.768592][ T3625] [ 52.768592][ T3625] stack backtrace: [ 52.774466][ T3625] CPU: 1 PID: 3625 Comm: syz-executor141 Not tainted 5.15.158-syzkaller #0 [ 52.783048][ T3625] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 [ 52.793102][ T3625] Call Trace: [ 52.796387][ T3625] [ 52.799318][ T3625] dump_stack_lvl+0x1e3/0x2d0 [ 52.803994][ T3625] ? io_uring_drop_tctx_refs+0x1a0/0x1a0 [ 52.809625][ T3625] ? print_circular_bug+0x12b/0x1a0 [ 52.814840][ T3625] check_noncircular+0x2f8/0x3b0 [ 52.819780][ T3625] ? add_chain_block+0x850/0x850 [ 52.824715][ T3625] ? lockdep_lock+0x11f/0x2a0 [ 52.829389][ T3625] ? __lock_acquire+0x1295/0x1ff0 [ 52.834410][ T3625] validate_chain+0x1649/0x5930 [ 52.839265][ T3625] ? reacquire_held_locks+0x660/0x660 [ 52.844716][ T3625] ? validate_chain+0x112/0x5930 [ 52.849685][ T3625] ? __lock_acquire+0x1ff0/0x1ff0 [ 52.854712][ T3625] ? rcu_lock_acquire+0x30/0x30 [ 52.859573][ T3625] ? mark_lock+0x98/0x340 [ 52.863898][ T3625] __lock_acquire+0x1295/0x1ff0 [ 52.868758][ T3625] lock_acquire+0x1db/0x4f0 [ 52.873263][ T3625] ? try_to_wake_up+0xae/0x1300 [ 52.878129][ T3625] ? read_lock_is_recursive+0x10/0x10 [ 52.883506][ T3625] ? mark_lock+0x98/0x340 [ 52.887832][ T3625] ? __lock_acquire+0x1295/0x1ff0 [ 52.892854][ T3625] _raw_spin_lock_irqsave+0xd1/0x120 [ 52.898141][ T3625] ? try_to_wake_up+0xae/0x1300 [ 52.902989][ T3625] ? _raw_spin_lock+0x40/0x40 [ 52.907675][ T3625] try_to_wake_up+0xae/0x1300 [ 52.912358][ T3625] ? rcu_lock_release+0x5/0x20 [ 52.917119][ T3625] ? try_invoke_on_locked_down_task+0x450/0x450 [ 52.923357][ T3625] ? strlcpy+0x82/0xc0 [ 52.927420][ T3625] ? memcpy+0x3c/0x60 [ 52.931399][ T3625] rcu_read_unlock_special+0x3aa/0x520 [ 52.936941][ T3625] ? __rcu_read_unlock+0x100/0x100 [ 52.942053][ T3625] __rcu_read_unlock+0x92/0x100 [ 52.946909][ T3625] put_memcg_path_buf+0xde/0x100 [ 52.951859][ T3625] __mmap_lock_do_trace_acquire_returned+0x12f/0x340 [ 52.958535][ T3625] exc_page_fault+0x59c/0x740 [ 52.963236][ T3625] asm_exc_page_fault+0x22/0x30 [ 52.968088][ T3625] RIP: 0033:0x7fa09d3b8400 [ 52.972502][ T3625] Code: 84 dd fe ff ff 4c 89 e7 e8 ed 90 00 00 e9 d0 fe ff ff 0f 1f 84 00 00 00 00 00 49 8b 06 48 89 45 00 48 85 c0 0f 85 85 00 00 00 05 29 3d 0a 00 01 31 c0 87 05 f9 38 0a 00 83 f8 01 0f 8f 84 00 [ 52.992101][ T3625] RSP: 002b:00007fffae47cf00 EFLAGS: 00010246 [ 52.998159][ T3625] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000004 executing program executing program executing program executing program executing program executing program executing program [ 53.006120][ T3625] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 00007fa09d45aad8 [ 53.014089][ T3625] RBP: 00007fa09d459120 R08: 00000000000000a0 R09: 00000000000000a0 [ 53.022070][ T3625] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa09d45bd08 [ 53.030031][ T3625] R13: 0000000000000000 R14: 00007fa09d45bd20 R15: 00007fa09d3b1290 [ 53.038003][ T3625] executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program