syzbot has found a reproducer for the following issue on: HEAD commit: 445d9f05fa14 Merge tag 'nfsd-6.13' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1693d530580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3c44a32edb32752c dashboard link: https://syzkaller.appspot.com/bug?extid=c6c4861455fdd207f160 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15abb778580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11977ff7980000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-445d9f05.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a928f58090e0/vmlinux-445d9f05.xz kernel image: https://storage.googleapis.com/syzbot-assets/4212b152a056/bzImage-445d9f05.xz The issue was bisected to: commit 893cdaaa3977be6afb3a7f756fbfd7be83f68d8c Author: Wander Lairson Costa <wander@xxxxxxxxxx> Date: Wed Jun 14 12:23:22 2023 +0000 sched: avoid false lockdep splat in put_task_struct() bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14a00127980000 final oops: https://syzkaller.appspot.com/x/report.txt?x=16a00127980000 console output: https://syzkaller.appspot.com/x/log.txt?x=12a00127980000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c6c4861455fdd207f160@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 893cdaaa3977 ("sched: avoid false lockdep splat in put_task_struct()") BUG: MAX_STACK_TRACE_ENTRIES too low! turning off the locking correctness validator. CPU: 1 UID: 0 PID: 5965 Comm: sshd Not tainted 6.12.0-syzkaller-09734-g445d9f05fa14 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 save_trace+0x78f/0xb60 kernel/locking/lockdep.c:579 check_prev_add kernel/locking/lockdep.c:3222 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x312a/0x3c40 kernel/locking/lockdep.c:5226 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 htab_lock_bucket kernel/bpf/hashtab.c:167 [inline] htab_lru_map_delete_elem+0x1c8/0x790 kernel/bpf/hashtab.c:1484 bpf_prog_2c29ac5cdc6b1842+0x43/0x47 bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline] __bpf_prog_run include/linux/filter.h:701 [inline] bpf_prog_run include/linux/filter.h:708 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2351 [inline] bpf_trace_run3+0x240/0x5a0 kernel/trace/bpf_trace.c:2393 trace_kmem_cache_free include/trace/events/kmem.h:114 [inline] kmem_cache_free+0x200/0x4c0 mm/slub.c:4699 skb_kfree_head net/core/skbuff.c:1084 [inline] skb_kfree_head net/core/skbuff.c:1081 [inline] skb_free_head+0x18a/0x1d0 net/core/skbuff.c:1098 skb_release_data+0x560/0x730 net/core/skbuff.c:1125 skb_release_all net/core/skbuff.c:1190 [inline] __kfree_skb+0x4f/0x70 net/core/skbuff.c:1204 tcp_wmem_free_skb include/net/tcp.h:306 [inline] tcp_rtx_queue_unlink_and_free include/net/tcp.h:2091 [inline] tcp_clean_rtx_queue net/ipv4/tcp_input.c:3436 [inline] tcp_ack+0x1eb7/0x5ba0 net/ipv4/tcp_input.c:4032 tcp_rcv_established+0xcab/0x20f0 net/ipv4/tcp_input.c:6173 tcp_v4_do_rcv+0x5ca/0xa90 net/ipv4/tcp_ipv4.c:1916 sk_backlog_rcv include/net/sock.h:1121 [inline] __release_sock+0x31b/0x400 net/core/sock.c:3083 release_sock+0x5a/0x220 net/core/sock.c:3637 tcp_sendmsg+0x38/0x50 net/ipv4/tcp.c:1359 inet_sendmsg+0xb9/0x140 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg net/socket.c:726 [inline] sock_write_iter+0x4ac/0x5b0 net/socket.c:1147 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x5ae/0x1150 fs/read_write.c:679 ksys_write+0x207/0x250 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f850c116bf2 Code: 89 c7 48 89 44 24 08 e8 7b 34 fa ff 48 8b 44 24 08 48 83 c4 28 c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6f 48 8b 15 07 a2 0d 00 f7 d8 64 89 02 48 83 RSP: 002b:00007fffe9a02c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000034 RCX: 00007f850c116bf2 RDX: 0000000000000034 RSI: 0000559808160970 RDI: 0000000000000004 RBP: 0000559808169290 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00005597d5bb7aa4 R13: 00000000000000f4 R14: 00005597d5bb83e8 R15: 00007fffe9a02ce8 </TASK> --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
