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Message-ID: <6751da0c.050a0220.b4160.01dc.GAE@google.com> Date: Thu, 05 Dec 2024 08:51:24 -0800 From: syzbot <syzbot+46aa5474f179dacd1a3b@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, eric.dumazet@...il.com, horms@...nel.org, jmaloy@...hat.com, kuba@...nel.org, kuniyu@...zon.com, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com, tipc-discussion@...ts.sourceforge.net, ying.xue@...driver.com Subject: Re: [syzbot] [tipc?] general protection fault in cleanup_bearer syzbot has found a reproducer for the following issue on: HEAD commit: 31f1b55d5d7e net :mana :Request a V2 response version for .. git tree: net console+strace: https://syzkaller.appspot.com/x/log.txt?x=17d290f8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3891b550f14aea0f dashboard link: https://syzkaller.appspot.com/bug?extid=46aa5474f179dacd1a3b compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1724ade8580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=148868df980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ba0fb1ec0f79/disk-31f1b55d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/535224afed4c/vmlinux-31f1b55d.xz kernel image: https://storage.googleapis.com/syzbot-assets/bd1b0227ba3d/bzImage-31f1b55d.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+46aa5474f179dacd1a3b@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 0 UID: 0 PID: 9 Comm: kworker/0:1 Not tainted 6.12.0-syzkaller-10767-g31f1b55d5d7e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events cleanup_bearer RIP: 0010:read_pnet include/net/net_namespace.h:392 [inline] RIP: 0010:sock_net include/net/sock.h:655 [inline] RIP: 0010:cleanup_bearer+0x1f7/0x280 net/tipc/udp_media.c:820 Code: 18 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 ec 2e 91 f6 48 8b 1b 48 83 c3 30 e8 80 97 63 00 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 ca 2e 91 f6 49 83 c7 e8 48 8b 1b RSP: 0018:ffffc900000e7b70 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000030 RCX: ffff88801cef8000 RDX: dffffc0000000000 RSI: ffffffff8c0ad980 RDI: 0000000000000001 RBP: ffff8880287b5e08 R08: ffffffff9432398f R09: 1ffffffff2864731 R10: dffffc0000000000 R11: fffffbfff2864732 R12: ffff8880287b5e98 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880287b5e18 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efddcf2f208 CR3: 000000007aa02000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:read_pnet include/net/net_namespace.h:392 [inline] RIP: 0010:sock_net include/net/sock.h:655 [inline] RIP: 0010:cleanup_bearer+0x1f7/0x280 net/tipc/udp_media.c:820 Code: 18 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 ec 2e 91 f6 48 8b 1b 48 83 c3 30 e8 80 97 63 00 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 ca 2e 91 f6 49 83 c7 e8 48 8b 1b RSP: 0018:ffffc900000e7b70 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000030 RCX: ffff88801cef8000 RDX: dffffc0000000000 RSI: ffffffff8c0ad980 RDI: 0000000000000001 RBP: ffff8880287b5e08 R08: ffffffff9432398f R09: 1ffffffff2864731 R10: dffffc0000000000 R11: fffffbfff2864732 R12: ffff8880287b5e98 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880287b5e18 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055bf163e0cc0 CR3: 000000007e7d8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 18 48 89 sbb %cl,-0x77(%rax) 3: d8 48 c1 fmuls -0x3f(%rax) 6: e8 03 42 80 3c call 0x3c80420e b: 28 00 sub %al,(%rax) d: 74 08 je 0x17 f: 48 89 df mov %rbx,%rdi 12: e8 ec 2e 91 f6 call 0xf6912f03 17: 48 8b 1b mov (%rbx),%rbx 1a: 48 83 c3 30 add $0x30,%rbx 1e: e8 80 97 63 00 call 0x6397a3 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 ca 2e 91 f6 call 0xf6912f03 39: 49 83 c7 e8 add $0xffffffffffffffe8,%r15 3d: 48 8b 1b mov (%rbx),%rbx --- 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.
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