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Message-ID: <68c3ea70.050a0220.3c6139.049f.GAE@google.com> Date: Fri, 12 Sep 2025 02:40:00 -0700 From: syzbot ci <syzbot+ci29ccfbf0bb0ca710@...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 [v2] net: devmem: improve cpu cost of RX token management https://lore.kernel.org/all/20250911-scratch-bobbyeshleman-devmem-tcp-token-upstream-v2-0-c80d735bd453@meta.com * [PATCH net-next v2 1/3] net: devmem: rename tx_vec to vec in dmabuf binding * [PATCH net-next v2 2/3] net: devmem: use niov array for token management * [PATCH net-next v2 3/3] net: ethtool: prevent user from breaking devmem single-binding rule and found the following issue: general protection fault in sock_devmem_dontneed Full report is available here: https://ci.syzbot.org/series/40b2252a-f8bb-4cec-bfc1-2ff8a3c55336 *** 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: 5adf6f2b9972dbb69f4dd11bae52ba251c64ecb7 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/2c30c608-f14f-4e6d-9772-cc5e129939fc/config C repro: https://ci.syzbot.org/findings/c89c36f8-4666-47d0-bc39-35662a268e4d/c_repro syz repro: https://ci.syzbot.org/findings/c89c36f8-4666-47d0-bc39-35662a268e4d/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: 1 UID: 0 PID: 6028 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+0x40b/0x910 net/core/sock.c:1112 Code: 8b 44 24 18 44 8b 20 44 03 64 24 14 48 8b 44 24 68 80 3c 18 00 74 08 4c 89 ef e8 f0 bb c9 f8 4d 8b 7d 00 4c 89 f8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ff e8 d7 bb c9 f8 4d 8b 2f 4c 89 e8 48 c1 RSP: 0018:ffffc90002987ac0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 1ffff11020d27e78 RDX: ffff88810a039cc0 RSI: 0000000000000003 RDI: 0000000000000000 RBP: ffffc90002987c50 R08: ffffc90002987bdf R09: 0000000000000000 R10: ffffc90002987b60 R11: fffff52000530f7c R12: 0000000000000006 R13: ffff8881235cb710 R14: 0000000000000000 R15: 0000000000000000 FS: 000055555e866500(0000) GS:ffff8881a3c14000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31b63fff CR3: 0000000027a20000 CR4: 00000000000006f0 Call Trace: <TASK> sk_setsockopt+0x682/0x2dc0 net/core/sock.c:1301 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: 0033:0x7faf24f8eba9 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:00007ffc3eb96018 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007faf251d5fa0 RCX: 00007faf24f8eba9 RDX: 0000000000000050 RSI: 0000000000000001 RDI: 0000000000000003 RBP: 00007faf25011e19 R08: 0000000000000048 R09: 0000000000000000 R10: 0000200000000100 R11: 0000000000000246 R12: 0000000000000000 R13: 00007faf251d5fa0 R14: 00007faf251d5fa0 R15: 0000000000000005 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:sock_devmem_dontneed+0x40b/0x910 net/core/sock.c:1112 Code: 8b 44 24 18 44 8b 20 44 03 64 24 14 48 8b 44 24 68 80 3c 18 00 74 08 4c 89 ef e8 f0 bb c9 f8 4d 8b 7d 00 4c 89 f8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ff e8 d7 bb c9 f8 4d 8b 2f 4c 89 e8 48 c1 RSP: 0018:ffffc90002987ac0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 1ffff11020d27e78 RDX: ffff88810a039cc0 RSI: 0000000000000003 RDI: 0000000000000000 RBP: ffffc90002987c50 R08: ffffc90002987bdf R09: 0000000000000000 R10: ffffc90002987b60 R11: fffff52000530f7c R12: 0000000000000006 R13: ffff8881235cb710 R14: 0000000000000000 R15: 0000000000000000 FS: 000055555e866500(0000) GS:ffff8881a3c14000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31b63fff CR3: 0000000027a20000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: 8b 44 24 18 mov 0x18(%rsp),%eax 4: 44 8b 20 mov (%rax),%r12d 7: 44 03 64 24 14 add 0x14(%rsp),%r12d c: 48 8b 44 24 68 mov 0x68(%rsp),%rax 11: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) 15: 74 08 je 0x1f 17: 4c 89 ef mov %r13,%rdi 1a: e8 f0 bb c9 f8 call 0xf8c9bc0f 1f: 4d 8b 7d 00 mov 0x0(%r13),%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ff mov %r15,%rdi 33: e8 d7 bb c9 f8 call 0xf8c9bc0f 38: 4d 8b 2f mov (%r15),%r13 3b: 4c 89 e8 mov %r13,%rax 3e: 48 rex.W 3f: c1 .byte 0xc1 *** 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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