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Message-ID: <6938323e.a70a0220.104cf0.0008.GAE@google.com> Date: Tue, 09 Dec 2025 06:29:18 -0800 From: syzbot ci <syzbot+cib018e69d32b0c0b5@...kaller.appspotmail.com> To: ast@...nel.org, bjorn@...nel.org, bpf@...r.kernel.org, daniel@...earbox.net, davem@...emloft.net, edumazet@...gle.com, hawk@...nel.org, john.fastabend@...il.com, jonathan.lemon@...il.com, kerneljasonxing@...il.com, kernelxing@...cent.com, kuba@...nel.org, maciej.fijalkowski@...el.com, magnus.karlsson@...el.com, netdev@...r.kernel.org, pabeni@...hat.com, sdf@...ichev.me Cc: syzbot@...ts.linux.dev, syzkaller-bugs@...glegroups.com Subject: [syzbot ci] Re: xsk: introduce pre-allocated memory per xsk CQ syzbot ci has tested the following series [v1] xsk: introduce pre-allocated memory per xsk CQ https://lore.kernel.org/all/20251209085950.96231-1-kerneljasonxing@gmail.com * [PATCH bpf-next v1 1/2] xsk: introduce local_cq for each af_xdp socket * [PATCH bpf-next v1 2/2] xsk: introduce a dedicated local completion queue for each xsk and found the following issue: WARNING in vfree Full report is available here: https://ci.syzbot.org/series/5df45d2b-41d6-4675-b3ad-4503516a9ae1 *** WARNING in vfree tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: 835a50753579aa8368a08fca307e638723207768 arch: amd64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 config: https://ci.syzbot.org/builds/726617c2-a613-4879-9987-91e65545dba1/config C repro: https://ci.syzbot.org/findings/0c82a0b1-8cb3-49ae-9fbe-fa3bd02c2ba0/c_repro syz repro: https://ci.syzbot.org/findings/0c82a0b1-8cb3-49ae-9fbe-fa3bd02c2ba0/syz_repro ------------[ cut here ]------------ Trying to vfree() nonexistent vm area (ffffc900034e6000) WARNING: mm/vmalloc.c:3423 at 0x0, CPU#0: syz.0.19/5983 Modules linked in: CPU: 0 UID: 0 PID: 5983 Comm: syz.0.19 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:vfree+0x393/0x400 mm/vmalloc.c:3422 Code: e8 72 1d ab ff 4c 89 f7 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d e9 0c fa ff ff e8 57 1d ab ff 48 8d 3d 10 fc 6e 0d 4c 89 f6 <67> 48 0f b9 3a e9 fd fd ff ff e8 3e 1d ab ff 4c 89 e7 e8 66 00 00 RSP: 0018:ffffc90004e37c40 EFLAGS: 00010293 RAX: ffffffff82162d09 RBX: 0000000000000000 RCX: ffff88816c66d7c0 RDX: 0000000000000000 RSI: ffffc900034e6000 RDI: ffffffff8f852920 RBP: 1ffff1102289d8bf R08: ffff88810005f1bb R09: 1ffff1102000be37 R10: dffffc0000000000 R11: ffffed102000be38 R12: ffff88801eed1818 R13: dffffc0000000000 R14: ffffc900034e6000 R15: ffff8881144ec608 FS: 0000555574db2500(0000) GS:ffff88818eab1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000000c0 CR3: 0000000112a48000 CR4: 00000000000006f0 Call Trace: <TASK> xsk_clear_local_cq net/xdp/xsk.c:1188 [inline] xsk_release+0x6b3/0x880 net/xdp/xsk.c:1220 __sock_release net/socket.c:653 [inline] sock_close+0xc3/0x240 net/socket.c:1446 __fput+0x44c/0xa70 fs/file_table.c:468 task_work_run+0x1d4/0x260 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0xff/0x4f0 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x2e3/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7eff8518f7c9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd6ca61b78 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 000000000001253b RCX: 00007eff8518f7c9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000001 R09: 000000086ca61e6f R10: 0000001b2f920000 R11: 0000000000000246 R12: 00007eff853e5fac R13: 00007eff853e5fa0 R14: ffffffffffffffff R15: 0000000000000003 </TASK> ---------------- Code disassembly (best guess): 0: e8 72 1d ab ff call 0xffab1d77 5: 4c 89 f7 mov %r14,%rdi 8: 48 83 c4 18 add $0x18,%rsp c: 5b pop %rbx d: 41 5c pop %r12 f: 41 5d pop %r13 11: 41 5e pop %r14 13: 41 5f pop %r15 15: 5d pop %rbp 16: e9 0c fa ff ff jmp 0xfffffa27 1b: e8 57 1d ab ff call 0xffab1d77 20: 48 8d 3d 10 fc 6e 0d lea 0xd6efc10(%rip),%rdi # 0xd6efc37 27: 4c 89 f6 mov %r14,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 fd fd ff ff jmp 0xfffffe31 34: e8 3e 1d ab ff call 0xffab1d77 39: 4c 89 e7 mov %r12,%rdi 3c: e8 .byte 0xe8 3d: 66 00 00 data16 add %al,(%rax) *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@...kaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@...glegroups.com.
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