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Message-ID: <689b1044.050a0220.7f033.011b.GAE@google.com> Date: Tue, 12 Aug 2025 02:58:28 -0700 From: syzbot <syzbot+8aa80c6232008f7b957d@...kaller.appspotmail.com> To: andrew+netdev@...n.ch, andrew@...n.ch, davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, kuni1840@...il.com, kuniyu@...gle.com, leitao@...ian.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [net?] BUG: unable to handle kernel paging request in nsim_queue_free syzbot has found a reproducer for the following issue on: HEAD commit: 53e760d89498 Merge tag 'nfsd-6.17-1' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16c415a2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d67d3af29f50297e dashboard link: https://syzkaller.appspot.com/bug?extid=8aa80c6232008f7b957d 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=151be9a2580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-53e760d8.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7f26eabe958a/vmlinux-53e760d8.xz kernel image: https://storage.googleapis.com/syzbot-assets/60128fb74c23/bzImage-53e760d8.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8aa80c6232008f7b957d@...kaller.appspotmail.com BUG: unable to handle page fault for address: ffff88808d211020 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 1a201067 P4D 1a201067 PUD 0 Oops: Oops: 0002 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 6665 Comm: syz.1.416 Not tainted 6.17.0-rc1-syzkaller-00004-g53e760d89498 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:local_add arch/x86/include/asm/local.h:33 [inline] RIP: 0010:u64_stats_add include/linux/u64_stats_sync.h:89 [inline] RIP: 0010:dev_dstats_rx_dropped_add include/linux/netdevice.h:3027 [inline] RIP: 0010:nsim_queue_free+0xdc/0x150 drivers/net/netdevsim/netdev.c:714 Code: 10 1d be 8d 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 db 1a 0d fb 49 8b 07 48 8b 0c 24 <4a> 01 4c 28 20 4c 89 f7 be 00 02 00 00 e8 72 5a 6d fa 4c 89 e7 be RSP: 0018:ffffc9000d7bede0 EFLAGS: 00010246 RAX: ffff88808d211000 RBX: ffff888044417000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008 RBP: 0000000000000000 R08: ffffffff8e1e6327 R09: 1ffffffff1c3cc64 R10: dffffc0000000000 R11: fffffbfff1c3cc65 R12: ffff888044417218 R13: 0000000000000000 R14: ffffffff87178ba3 R15: ffffffff8dbe1d10 FS: 00007f7dce64a6c0(0000) GS:ffff88808d211000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88808d211020 CR3: 0000000059d35000 CR4: 0000000000352ef0 Call Trace: <TASK> nsim_queue_uninit drivers/net/netdevsim/netdev.c:993 [inline] nsim_init_netdevsim drivers/net/netdevsim/netdev.c:1049 [inline] nsim_create+0xbbf/0xf10 drivers/net/netdevsim/netdev.c:1101 __nsim_dev_port_add+0x6b6/0xb10 drivers/net/netdevsim/dev.c:1438 nsim_dev_port_add_all+0x37/0xf0 drivers/net/netdevsim/dev.c:1494 nsim_dev_reload_create drivers/net/netdevsim/dev.c:1546 [inline] nsim_dev_reload_up+0x451/0x780 drivers/net/netdevsim/dev.c:1003 devlink_reload+0x4e9/0x8d0 net/devlink/dev.c:474 devlink_nl_reload_doit+0xb35/0xd50 net/devlink/dev.c:584 genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2552 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:729 ____sys_sendmsg+0x505/0x830 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703 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: 0033:0x7f7dcd78ebe9 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:00007f7dce64a038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f7dcd9b5fa0 RCX: 00007f7dcd78ebe9 RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000000000000003 RBP: 00007f7dcd811e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7dcd9b6038 R14: 00007f7dcd9b5fa0 R15: 00007ffc4b525678 </TASK> Modules linked in: CR2: ffff88808d211020 ---[ end trace 0000000000000000 ]--- RIP: 0010:local_add arch/x86/include/asm/local.h:33 [inline] RIP: 0010:u64_stats_add include/linux/u64_stats_sync.h:89 [inline] RIP: 0010:dev_dstats_rx_dropped_add include/linux/netdevice.h:3027 [inline] RIP: 0010:nsim_queue_free+0xdc/0x150 drivers/net/netdevsim/netdev.c:714 Code: 10 1d be 8d 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 db 1a 0d fb 49 8b 07 48 8b 0c 24 <4a> 01 4c 28 20 4c 89 f7 be 00 02 00 00 e8 72 5a 6d fa 4c 89 e7 be RSP: 0018:ffffc9000d7bede0 EFLAGS: 00010246 RAX: ffff88808d211000 RBX: ffff888044417000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008 RBP: 0000000000000000 R08: ffffffff8e1e6327 R09: 1ffffffff1c3cc64 R10: dffffc0000000000 R11: fffffbfff1c3cc65 R12: ffff888044417218 R13: 0000000000000000 R14: ffffffff87178ba3 R15: ffffffff8dbe1d10 FS: 00007f7dce64a6c0(0000) GS:ffff88808d211000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88808d211020 CR3: 0000000059d35000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 10 1d be 8d 4c 89 adc %bl,-0x76b37242(%rip) # 0x894c8dc4 6: f8 clc 7: 48 c1 e8 03 shr $0x3,%rax b: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 12: fc ff df 15: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) 19: 74 08 je 0x23 1b: 4c 89 ff mov %r15,%rdi 1e: e8 db 1a 0d fb call 0xfb0d1afe 23: 49 8b 07 mov (%r15),%rax 26: 48 8b 0c 24 mov (%rsp),%rcx * 2a: 4a 01 4c 28 20 add %rcx,0x20(%rax,%r13,1) <-- trapping instruction 2f: 4c 89 f7 mov %r14,%rdi 32: be 00 02 00 00 mov $0x200,%esi 37: e8 72 5a 6d fa call 0xfa6d5aae 3c: 4c 89 e7 mov %r12,%rdi 3f: be .byte 0xbe --- 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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