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Message-ID: <68a5d298.050a0220.3d78fd.0003.GAE@google.com> Date: Wed, 20 Aug 2025 06:50:16 -0700 From: syzbot ci <syzbot+ci8b7a13618981d53b@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, ferenc@...es.dev, horms@...nel.org, jackzxcui1989@....com, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, willemdebruijn.kernel@...il.com Cc: syzbot@...ts.linux.dev, syzkaller-bugs@...glegroups.com Subject: [syzbot ci] Re: net: af_packet: Use hrtimer to do the retire operation syzbot ci has tested the following series [v6] net: af_packet: Use hrtimer to do the retire operation https://lore.kernel.org/all/20250820092925.2115372-1-jackzxcui1989@163.com * [PATCH net-next v6] net: af_packet: Use hrtimer to do the retire operation and found the following issue: WARNING in hrtimer_forward Full report is available here: https://ci.syzbot.org/series/81b08fd6-a740-4520-9c88-b7dcdc7953a1 *** WARNING in hrtimer_forward tree: net-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git base: da114122b83149d1f1db0586b1d67947b651aa20 arch: amd64 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 config: https://ci.syzbot.org/builds/0ebac6ed-b7ae-4c3d-9edc-db3a521ad7a0/config C repro: https://ci.syzbot.org/findings/c3421800-7bbc-4097-a1cf-36e97a4dea98/c_repro syz repro: https://ci.syzbot.org/findings/c3421800-7bbc-4097-a1cf-36e97a4dea98/syz_repro ------------[ cut here ]------------ WARNING: CPU: 1 PID: 6012 at kernel/time/hrtimer.c:1052 hrtimer_forward+0x1d6/0x2b0 kernel/time/hrtimer.c:1052 Modules linked in: CPU: 1 UID: 0 PID: 6012 Comm: syz.0.20 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:hrtimer_forward+0x1d6/0x2b0 kernel/time/hrtimer.c:1052 Code: 4c 89 33 48 8b 04 24 eb 07 e8 66 30 12 00 31 c0 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d e9 01 b0 ce 09 cc e8 4b 30 12 00 90 <0f> 0b 90 eb df 48 89 e8 4c 09 f8 48 c1 e8 20 74 0a 48 89 e8 31 d2 RSP: 0018:ffffc900029def90 EFLAGS: 00010293 RAX: ffffffff81ad7be5 RBX: ffff888028782648 RCX: ffff88810e88d640 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 000000000000116b R08: ffffffff8fa37e37 R09: 1ffffffff1f46fc6 R10: dffffc0000000000 R11: ffffffff81724e10 R12: ffff888028782660 R13: 00000000007a1200 R14: 1ffff110050f04cc R15: 0000000000000001 FS: 000055555f6cd500(0000) GS:ffff8881a3c1c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcf1be3d88 CR3: 0000000023c86000 CR4: 00000000000006f0 Call Trace: <TASK> hrtimer_forward_now include/linux/hrtimer.h:366 [inline] _prb_refresh_rx_retire_blk_timer net/packet/af_packet.c:697 [inline] prb_open_block+0x3a7/0x5e0 net/packet/af_packet.c:930 prb_dispatch_next_block net/packet/af_packet.c:994 [inline] __packet_lookup_frame_in_block net/packet/af_packet.c:1152 [inline] packet_current_rx_frame net/packet/af_packet.c:1178 [inline] tpacket_rcv+0x1229/0x2f40 net/packet/af_packet.c:2409 deliver_skb net/core/dev.c:2472 [inline] deliver_ptype_list_skb net/core/dev.c:2487 [inline] __netif_receive_skb_core+0x3107/0x4020 net/core/dev.c:5923 __netif_receive_skb_list_core+0x23f/0x800 net/core/dev.c:6054 __netif_receive_skb_list net/core/dev.c:6121 [inline] netif_receive_skb_list_internal+0x975/0xcc0 net/core/dev.c:6212 netif_receive_skb_list+0x54/0x450 net/core/dev.c:6264 xdp_recv_frames net/bpf/test_run.c:280 [inline] xdp_test_run_batch net/bpf/test_run.c:361 [inline] bpf_test_run_xdp_live+0x1786/0x1b10 net/bpf/test_run.c:390 bpf_prog_test_run_xdp+0x713/0x1000 net/bpf/test_run.c:1322 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4590 __sys_bpf+0x581/0x870 kernel/bpf/syscall.c:6047 __do_sys_bpf kernel/bpf/syscall.c:6139 [inline] __se_sys_bpf kernel/bpf/syscall.c:6137 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6137 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f31da38ebe9 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:00007ffcf1be5358 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f31da5b5fa0 RCX: 00007f31da38ebe9 RDX: 0000000000000050 RSI: 0000200000000600 RDI: 000000000000000a RBP: 00007f31da411e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f31da5b5fa0 R14: 00007f31da5b5fa0 R15: 0000000000000003 </TASK> *** 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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