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Message-ID: <68af6f26.a70a0220.3cafd4.0033.GAE@google.com> Date: Wed, 27 Aug 2025 13:48:38 -0700 From: syzbot <syzbot+2eb8d1719f7cfcfa6840@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, eric.dumazet@...il.com, horms@...nel.org, kuba@...nel.org, kuniyu@...gle.com, linux-hams@...r.kernel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com, takamitz@...zon.co.jp Subject: Re: [syzbot] [hams?] general protection fault in rose_rt_ioctl syzbot has found a reproducer for the following issue on: HEAD commit: ceb951552404 Merge branch 'introduce-refcount_t-for-refere.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=102cdef0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=292f3bc9f654adeb dashboard link: https://syzkaller.appspot.com/bug?extid=2eb8d1719f7cfcfa6840 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14d12634580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17465c62580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7a0a7a3f8dbc/disk-ceb95155.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ec99703c0bdd/vmlinux-ceb95155.xz kernel image: https://storage.googleapis.com/syzbot-assets/248da817e5e1/bzImage-ceb95155.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2eb8d1719f7cfcfa6840@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 1 UID: 0 PID: 6018 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:rose_clear_routes net/rose/rose_route.c:565 [inline] RIP: 0010:rose_rt_ioctl+0x162/0x1250 net/rose/rose_route.c:760 Code: 3f 31 ff 44 89 fe e8 3d de 52 f7 45 85 ff 74 0a e8 33 db 52 f7 e9 76 02 00 00 48 8b 44 24 28 48 8d 50 10 49 89 d7 49 c1 ef 03 <43> 0f b6 04 2f 84 c0 48 89 54 24 20 0f 85 87 02 00 00 44 0f b6 22 RSP: 0018:ffffc90003797ae0 EFLAGS: 00010202 RAX: 0000000000000000 RBX: ffff8880779a8c00 RCX: 0000000000000000 RDX: 0000000000000010 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003797c10 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520006f2f4c R12: dffffc0000000000 R13: dffffc0000000000 R14: ffff8880776ed680 R15: 0000000000000002 FS: 000055556a056500(0000) GS:ffff888125d1b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31e63fff CR3: 0000000032b0a000 CR4: 00000000003526f0 Call Trace: <TASK> rose_ioctl+0x3ce/0x8b0 net/rose/af_rose.c:1381 sock_do_ioctl+0xd9/0x300 net/socket.c:1238 sock_ioctl+0x576/0x790 net/socket.c:1359 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584 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: 0033:0x7faf4938ebe9 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:00007fff8f03f7e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007faf495b5fa0 RCX: 00007faf4938ebe9 RDX: 0000000000000000 RSI: 00000000000089e4 RDI: 0000000000000008 RBP: 00007faf49411e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007faf495b5fa0 R14: 00007faf495b5fa0 R15: 0000000000000002 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:rose_clear_routes net/rose/rose_route.c:565 [inline] RIP: 0010:rose_rt_ioctl+0x162/0x1250 net/rose/rose_route.c:760 Code: 3f 31 ff 44 89 fe e8 3d de 52 f7 45 85 ff 74 0a e8 33 db 52 f7 e9 76 02 00 00 48 8b 44 24 28 48 8d 50 10 49 89 d7 49 c1 ef 03 <43> 0f b6 04 2f 84 c0 48 89 54 24 20 0f 85 87 02 00 00 44 0f b6 22 RSP: 0018:ffffc90003797ae0 EFLAGS: 00010202 RAX: 0000000000000000 RBX: ffff8880779a8c00 RCX: 0000000000000000 RDX: 0000000000000010 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003797c10 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520006f2f4c R12: dffffc0000000000 R13: dffffc0000000000 R14: ffff8880776ed680 R15: 0000000000000002 FS: 000055556a056500(0000) GS:ffff888125d1b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31e63fff CR3: 0000000032b0a000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 31 ff xor %edi,%edi 2: 44 89 fe mov %r15d,%esi 5: e8 3d de 52 f7 call 0xf752de47 a: 45 85 ff test %r15d,%r15d d: 74 0a je 0x19 f: e8 33 db 52 f7 call 0xf752db47 14: e9 76 02 00 00 jmp 0x28f 19: 48 8b 44 24 28 mov 0x28(%rsp),%rax 1e: 48 8d 50 10 lea 0x10(%rax),%rdx 22: 49 89 d7 mov %rdx,%r15 25: 49 c1 ef 03 shr $0x3,%r15 * 29: 43 0f b6 04 2f movzbl (%r15,%r13,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 48 89 54 24 20 mov %rdx,0x20(%rsp) 35: 0f 85 87 02 00 00 jne 0x2c2 3b: 44 0f b6 22 movzbl (%rdx),%r12d --- 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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