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Message-ID: <68b87ef8.050a0220.3db4df.01fb.GAE@google.com> Date: Wed, 03 Sep 2025 10:46:32 -0700 From: syzbot ci <syzbot+ci4cf7c6dde1c8793c@...kaller.appspotmail.com> To: almasrymina@...gle.com, bobbyeshleman@...il.com, bobbyeshleman@...a.com, davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com, horms@...nel.org, kuba@...nel.org, kuniyu@...gle.com, linux-kernel@...r.kernel.org, ncardwell@...gle.com, netdev@...r.kernel.org, pabeni@...hat.com, sdf@...ichev.me, willemb@...gle.com Cc: syzbot@...ts.linux.dev, syzkaller-bugs@...glegroups.com Subject: [syzbot ci] Re: net: devmem: improve cpu cost of RX token management syzbot ci has tested the following series [v1] net: devmem: improve cpu cost of RX token management https://lore.kernel.org/all/20250902-scratch-bobbyeshleman-devmem-tcp-token-upstream-v1-0-d946169b5550@meta.com * [PATCH net-next 1/2] net: devmem: rename tx_vec to vec in dmabuf binding * [PATCH net-next 2/2] net: devmem: use niov array for token management and found the following issue: general protection fault in sock_devmem_dontneed Full report is available here: https://ci.syzbot.org/series/c0dc7223-4222-461c-b04b-b6f0004c7509 *** general protection fault in sock_devmem_dontneed tree: net-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git base: 864ecc4a6dade82d3f70eab43dad0e277aa6fc78 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/6c521908-0a73-48bc-a0fd-2576cf868361/config C repro: https://ci.syzbot.org/findings/9374f388-d643-42ea-831b-872eb5000b3c/c_repro syz repro: https://ci.syzbot.org/findings/9374f388-d643-42ea-831b-872eb5000b3c/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 5993 Comm: syz.0.17 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:sock_devmem_dontneed+0x3fd/0x960 net/core/sock.c:1112 Code: 8b 44 24 40 44 8b 28 44 03 6c 24 14 48 8b 44 24 20 42 80 3c 20 00 74 08 4c 89 ff e8 4d eb c9 f8 4d 8b 3f 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 34 eb c9 f8 4d 8b 3f 4c 89 f8 48 RSP: 0018:ffffc90001c4fac0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffff11004ddcfe0 RDX: ffff88801f6a8000 RSI: 0000000000000400 RDI: 0000000000000000 RBP: ffffc90001c4fc50 R08: ffffc90001c4fbdf R09: 0000000000000000 R10: ffffc90001c4fb60 R11: fffff52000389f7c R12: dffffc0000000000 R13: 00000000ffffffff R14: 0000000000000000 R15: 0000000000000000 FS: 000055558634d500(0000) GS:ffff8880b8614000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30e63fff CR3: 0000000026b68000 CR4: 00000000000006f0 Call Trace: <TASK> sk_setsockopt+0x682/0x2dc0 net/core/sock.c:1302 do_sock_setsockopt+0x11b/0x1b0 net/socket.c:2340 __sys_setsockopt net/socket.c:2369 [inline] __do_sys_setsockopt net/socket.c:2375 [inline] __se_sys_setsockopt net/socket.c:2372 [inline] __x64_sys_setsockopt+0x13f/0x1b0 net/socket.c:2372 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: 0033:0x7fea2bb8ebe9 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:00007ffc81c63348 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fea2bdc5fa0 RCX: 00007fea2bb8ebe9 RDX: 0000000000000050 RSI: 0000000000000001 RDI: 0000000000000003 RBP: 00007fea2bc11e19 R08: 0000000000000048 R09: 0000000000000000 R10: 0000200000000100 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fea2bdc5fa0 R14: 00007fea2bdc5fa0 R15: 0000000000000005 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:sock_devmem_dontneed+0x3fd/0x960 net/core/sock.c:1112 Code: 8b 44 24 40 44 8b 28 44 03 6c 24 14 48 8b 44 24 20 42 80 3c 20 00 74 08 4c 89 ff e8 4d eb c9 f8 4d 8b 3f 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 34 eb c9 f8 4d 8b 3f 4c 89 f8 48 RSP: 0018:ffffc90001c4fac0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffff11004ddcfe0 RDX: ffff88801f6a8000 RSI: 0000000000000400 RDI: 0000000000000000 RBP: ffffc90001c4fc50 R08: ffffc90001c4fbdf R09: 0000000000000000 R10: ffffc90001c4fb60 R11: fffff52000389f7c R12: dffffc0000000000 R13: 00000000ffffffff R14: 0000000000000000 R15: 0000000000000000 FS: 000055558634d500(0000) GS:ffff8880b8614000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30e63fff CR3: 0000000026b68000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: 8b 44 24 40 mov 0x40(%rsp),%eax 4: 44 8b 28 mov (%rax),%r13d 7: 44 03 6c 24 14 add 0x14(%rsp),%r13d c: 48 8b 44 24 20 mov 0x20(%rsp),%rax 11: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) 16: 74 08 je 0x20 18: 4c 89 ff mov %r15,%rdi 1b: e8 4d eb c9 f8 call 0xf8c9eb6d 20: 4d 8b 3f mov (%r15),%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 ff mov %r15,%rdi 34: e8 34 eb c9 f8 call 0xf8c9eb6d 39: 4d 8b 3f mov (%r15),%r15 3c: 4c 89 f8 mov %r15,%rax 3f: 48 rex.W *** 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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