> Date: Thu, 09 Oct 2025 09:46:27 -0700 [thread overview] > Hello, > > syzbot found the following issue on: > > HEAD commit: ec714e371f22 Merge tag 'perf-tools-for-v6.18-1-2025-10-08'.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=174a4b34580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=db9c80a8900dca57 > dashboard link: https://syzkaller.appspot.com/bug?extid=665739f456b28f32b23d > compiler: Debian clang version 20.1.8 > (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=140e0dcd980000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1581452f980000 > > Downloadable assets: > disk image: > https://storage.googleapis.com/syzbot-assets/6d5cce2bcf5d/disk-ec714e37.raw.xz > vmlinux: > https://storage.googleapis.com/syzbot-assets/60dff1e3a58f/vmlinux-ec714e37.xz > kernel image: > https://storage.googleapis.com/syzbot-assets/6a1823720b55/bzImage-ec714e37.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: [email protected] > > BUG: sleeping function called from invalid context at > kernel/locking/spinlock_rt.c:48 > in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 6069, name: syz.0.17 > preempt_count: 1, expected: 0 > RCU nest depth: 2, expected: 2 > 5 locks held by syz.0.17/6069: > #0: ffff888035808350 (sk_lock-AF_VSOCK){+.+.}-{0:0}, at: lock_sock > include/net/sock.h:1679 [inline] > #0: ffff888035808350 (sk_lock-AF_VSOCK){+.+.}-{0:0}, at: > vsock_connect+0x152/0xe20 net/vmw_vsock/af_vsock.c:1546 > #1: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire > include/linux/rcupdate.h:331 [inline] > #1: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock > include/linux/rcupdate.h:867 [inline] > #1: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run > kernel/trace/bpf_trace.c:2074 [inline] > #1: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: > bpf_trace_run9+0x1ec/0x500 kernel/trace/bpf_trace.c:2123 > #2: ffff8880b8832c88 ((stream_local_lock)){+.+.}-{3:3}, at: > bpf_stream_page_local_lock kernel/bpf/stream.c:46 [inline] > #2: ffff8880b8832c88 ((stream_local_lock)){+.+.}-{3:3}, at: > bpf_stream_elem_alloc kernel/bpf/stream.c:175 [inline] > #2: ffff8880b8832c88 ((stream_local_lock)){+.+.}-{3:3}, at: > __bpf_stream_push_str+0x211/0xbe0 kernel/bpf/stream.c:190 > #3: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire > include/linux/rcupdate.h:331 [inline] > #3: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock > include/linux/rcupdate.h:867 [inline] > #3: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: __rt_spin_trylock > kernel/locking/spinlock_rt.c:110 [inline] > #3: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: > rt_spin_trylock+0x10d/0x2b0 kernel/locking/spinlock_rt.c:118 > #4: ffff8880b883f6e8 (&s->lock_key#5){+.+.}-{3:3}, at: spin_lock > include/linux/spinlock_rt.h:44 [inline] > #4: ffff8880b883f6e8 (&s->lock_key#5){+.+.}-{3:3}, at: > ___slab_alloc+0x12f/0x1470 mm/slub.c:4492 > Preemption disabled at: > [<0000000000000000>] 0x0 > CPU: 0 UID: 0 PID: 6069 Comm: syz.0.17 Not tainted syzkaller #0 > PREEMPT_{RT,(full)} > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 10/02/2025 > Call Trace: > <TASK> > dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 > __might_resched+0x44b/0x5d0 kernel/sched/core.c:8925 > __rt_spin_lock kernel/locking/spinlock_rt.c:48 [inline] > rt_spin_lock+0xc7/0x3e0 kernel/locking/spinlock_rt.c:57 > spin_lock include/linux/spinlock_rt.h:44 [inline]
Given atomic context enforced by bpf [1], this is another case that bpf makes trouble. [1] cant_sleep() in __bpf_trace_run() https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/kernel/trace/bpf_trace.c#n2065 > ___slab_alloc+0x12f/0x1470 mm/slub.c:4492 > __slab_alloc+0xc6/0x1f0 mm/slub.c:4746 > __slab_alloc_node mm/slub.c:4822 [inline] > slab_alloc_node mm/slub.c:5233 [inline] > __kmalloc_cache_noprof+0xec/0x6c0 mm/slub.c:5719 > kmalloc_noprof include/linux/slab.h:957 [inline] > add_stack_record_to_list mm/page_owner.c:172 [inline] > inc_stack_record_count mm/page_owner.c:214 [inline] > __set_page_owner+0x25c/0x490 mm/page_owner.c:333 > set_page_owner include/linux/page_owner.h:32 [inline] > post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850 > prep_new_page mm/page_alloc.c:1858 [inline] > get_page_from_freelist+0x28c0/0x2960 mm/page_alloc.c:3884 > alloc_frozen_pages_nolock_noprof+0xbc/0x150 mm/page_alloc.c:7595 > alloc_pages_nolock_noprof+0xa/0x30 mm/page_alloc.c:7628 > bpf_stream_page_replace+0x19/0x1e0 kernel/bpf/stream.c:86 > bpf_stream_page_reserve_elem kernel/bpf/stream.c:142 [inline] > bpf_stream_elem_alloc kernel/bpf/stream.c:177 [inline] > __bpf_stream_push_str+0x35c/0xbe0 kernel/bpf/stream.c:190 > bpf_stream_stage_printk+0x14e/0x1c0 kernel/bpf/stream.c:448 > bpf_prog_report_may_goto_violation+0xc4/0x190 kernel/bpf/core.c:3181 > bpf_check_timed_may_goto+0xaa/0xb0 kernel/bpf/core.c:3199 > arch_bpf_timed_may_goto+0x21/0x40 arch/x86/net/bpf_timed_may_goto.S:40 > bpf_prog_6fd842a53d323cc5+0x53/0x5f > bpf_dispatcher_nop_func include/linux/bpf.h:1350 [inline] > __bpf_prog_run include/linux/filter.h:721 [inline] > bpf_prog_run include/linux/filter.h:728 [inline] > __bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline] > bpf_trace_run9+0x2db/0x500 kernel/trace/bpf_trace.c:2123 > __bpf_trace_virtio_transport_alloc_pkt+0x2d7/0x340 > include/trace/events/vsock_virtio_transport_common.h:39 > __do_trace_virtio_transport_alloc_pkt > include/trace/events/vsock_virtio_transport_common.h:39 [inline] > trace_virtio_transport_alloc_pkt > include/trace/events/vsock_virtio_transport_common.h:39 [inline] > virtio_transport_alloc_skb+0x10cc/0x1130 > net/vmw_vsock/virtio_transport_common.c:311 > virtio_transport_send_pkt_info+0x6be/0x1100 > net/vmw_vsock/virtio_transport_common.c:390 > virtio_transport_connect+0xa7/0x100 > net/vmw_vsock/virtio_transport_common.c:1072 > vsock_connect+0xb8b/0xe20 net/vmw_vsock/af_vsock.c:1611 > __sys_connect_file net/socket.c:2102 [inline] > __sys_connect+0x323/0x450 net/socket.c:2121 > __do_sys_connect net/socket.c:2127 [inline] > __se_sys_connect net/socket.c:2124 [inline] > __x64_sys_connect+0x7a/0x90 net/socket.c:2124 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f
