Warning: Permanently added '10.128.0.24' (ED25519) to the list of known hosts. 2024/04/23 23:36:30 ignoring optional flag "sandboxArg"="0" 2024/04/23 23:36:31 parsed 1 programs 2024/04/23 23:36:31 executed programs: 0 [ 45.464068][ T991] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k [ 51.049847][ T10] [ 51.052230][ T10] ====================================================== [ 51.059223][ T10] WARNING: possible circular locking dependency detected [ 51.066487][ T10] 6.9.0-rc2-syzkaller #0 Not tainted [ 51.071737][ T10] ------------------------------------------------------ [ 51.078833][ T10] kworker/u8:0/10 is trying to acquire lock: [ 51.086164][ T10] ffff88810136f6e0 (&u->lock){+.+.}-{2:2}, at: __unix_gc+0x158/0x470 [ 51.097434][ T10] [ 51.097434][ T10] but task is already holding lock: [ 51.105613][ T10] ffffffff82872678 (unix_gc_lock){+.+.}-{2:2}, at: __unix_gc+0xb2/0x470 [ 51.115056][ T10] [ 51.115056][ T10] which lock already depends on the new lock. [ 51.115056][ T10] [ 51.125469][ T10] [ 51.125469][ T10] the existing dependency chain (in reverse order) is: [ 51.134520][ T10] [ 51.134520][ T10] -> #1 (unix_gc_lock){+.+.}-{2:2}: [ 51.141866][ T10] _raw_spin_lock+0x2e/0x40 [ 51.147036][ T10] unix_notinflight+0x53/0xd0 [ 51.152297][ T10] unix_destruct_scm+0x7c/0xe0 [ 51.157548][ T10] skb_release_head_state+0x3e/0x90 [ 51.163774][ T10] __kfree_skb+0xd/0xa0 [ 51.168522][ T10] unix_stream_read_generic+0x224/0x930 [ 51.174556][ T10] unix_stream_splice_read+0x73/0xa0 [ 51.180507][ T10] splice_file_to_pipe+0x110/0x220 [ 51.186548][ T10] do_splice+0x73d/0x7b0 [ 51.191385][ T10] __se_sys_splice+0x18f/0x240 [ 51.196640][ T10] do_syscall_64+0xa8/0x190 [ 51.201709][ T10] entry_SYSCALL_64_after_hwframe+0x72/0x7a [ 51.208363][ T10] [ 51.208363][ T10] -> #0 (&u->lock){+.+.}-{2:2}: [ 51.215356][ T10] __lock_acquire+0x11fe/0x2490 [ 51.220717][ T10] lock_acquire+0xeb/0x270 [ 51.225616][ T10] _raw_spin_lock+0x2e/0x40 [ 51.230603][ T10] __unix_gc+0x158/0x470 [ 51.235338][ T10] process_scheduled_works+0x2a3/0x5b0 [ 51.241290][ T10] worker_thread+0x23e/0x300 [ 51.246366][ T10] kthread+0xea/0x100 [ 51.250833][ T10] ret_from_fork+0x32/0x40 [ 51.255731][ T10] ret_from_fork_asm+0x1a/0x30 [ 51.260980][ T10] [ 51.260980][ T10] other info that might help us debug this: [ 51.260980][ T10] [ 51.271172][ T10] Possible unsafe locking scenario: [ 51.271172][ T10] [ 51.278592][ T10] CPU0 CPU1 [ 51.283922][ T10] ---- ---- [ 51.289268][ T10] lock(unix_gc_lock); [ 51.293396][ T10] lock(&u->lock); [ 51.299688][ T10] lock(unix_gc_lock); [ 51.306322][ T10] lock(&u->lock); [ 51.310097][ T10] [ 51.310097][ T10] *** DEADLOCK *** [ 51.310097][ T10] [ 51.318354][ T10] 3 locks held by kworker/u8:0/10: [ 51.323539][ T10] #0: ffff88810007c948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x23e/0x5b0 [ 51.335634][ T10] #1: ffffc9000005be58 (unix_gc_work){+.+.}-{0:0}, at: process_scheduled_works+0x25e/0x5b0 [ 51.345779][ T10] #2: ffffffff82872678 (unix_gc_lock){+.+.}-{2:2}, at: __unix_gc+0xb2/0x470 [ 51.354721][ T10] [ 51.354721][ T10] stack backtrace: [ 51.361016][ T10] CPU: 1 PID: 10 Comm: kworker/u8:0 Not tainted 6.9.0-rc2-syzkaller #0 [ 51.370439][ T10] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 [ 51.380588][ T10] Workqueue: events_unbound __unix_gc [ 51.386067][ T10] Call Trace: [ 51.389338][ T10] [ 51.392350][ T10] dump_stack_lvl+0xa3/0x100 [ 51.397088][ T10] check_noncircular+0x119/0x140 [ 51.402021][ T10] __lock_acquire+0x11fe/0x2490 [ 51.407041][ T10] ? look_up_lock_class+0x6a/0xd0 [ 51.412226][ T10] ? register_lock_class+0x51/0x280 [ 51.417764][ T10] ? __lock_acquire+0x4f0/0x2490 [ 51.422872][ T10] ? __lock_acquire+0x4f0/0x2490 [ 51.427918][ T10] ? perf_trace_ipi_handler+0xc1/0xe0 [ 51.433624][ T10] ? __unix_gc+0x158/0x470 [ 51.438176][ T10] lock_acquire+0xeb/0x270 [ 51.442908][ T10] ? __unix_gc+0x158/0x470 [ 51.447581][ T10] ? debug_object_deactivate+0x4a/0x110 [ 51.453296][ T10] _raw_spin_lock+0x2e/0x40 [ 51.457783][ T10] ? __unix_gc+0x158/0x470 [ 51.462955][ T10] __unix_gc+0x158/0x470 [ 51.467179][ T10] ? process_scheduled_works+0x25e/0x5b0 [ 51.472928][ T10] process_scheduled_works+0x2a3/0x5b0 [ 51.478725][ T10] worker_thread+0x23e/0x300 [ 51.483298][ T10] ? __pfx_worker_thread+0x10/0x10 [ 51.488379][ T10] kthread+0xea/0x100 [ 51.492343][ T10] ? __pfx_kthread+0x10/0x10 [ 51.497220][ T10] ret_from_fork+0x32/0x40 2024/04/23 23:36:37 executed programs: 4 [ 51.501725][ T10] ? __pfx_kthread+0x10/0x10 [ 51.506477][ T10] ret_from_fork_asm+0x1a/0x30 [ 51.511219][ T10] 2024/04/23 23:36:42 executed programs: 10