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Message-ID: <67f78873.050a0220.25d1c8.000f.GAE@google.com> Date: Thu, 10 Apr 2025 01:59:31 -0700 From: syzbot <syzbot+ad0b3740715f38432033@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com Subject: [syzbot] [net?] WARNING in dst_cache_per_cpu_get Hello, syzbot found the following issue on: HEAD commit: 420aabef3ab5 net: Drop unused @sk of __skb_try_recv_from_q.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=11175070580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f2054704dd53fb80 dashboard link: https://syzkaller.appspot.com/bug?extid=ad0b3740715f38432033 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/9e407e3b3a07/disk-420aabef.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/08826ad1cf0b/vmlinux-420aabef.xz kernel image: https://storage.googleapis.com/syzbot-assets/df2ffedb4e99/bzImage-420aabef.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ad0b3740715f38432033@...kaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 0 PID: 6307 at ./include/net/dst.h:238 dst_hold include/net/dst.h:238 [inline] WARNING: CPU: 0 PID: 6307 at ./include/net/dst.h:238 dst_cache_per_cpu_get+0x29b/0x2b0 net/core/dst_cache.c:50 Modules linked in: CPU: 0 UID: 0 PID: 6307 Comm: syz.2.120 Not tainted 6.14.0-syzkaller-13320-g420aabef3ab5 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:dst_hold include/net/dst.h:238 [inline] RIP: 0010:dst_cache_per_cpu_get+0x29b/0x2b0 net/core/dst_cache.c:50 Code: 26 f8 e9 a6 fe ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 05 ff ff ff 48 89 df e8 00 2b 26 f8 e9 f8 fe ff ff e8 b6 01 bc f7 90 <0f> 0b 90 e9 0c fe ff ff 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 RSP: 0018:ffffc90000007768 EFLAGS: 00010246 RAX: ffffffff8a07558a RBX: 0000000000000001 RCX: ffff88807e56bc00 RDX: 0000000000000100 RSI: 0000000000000004 RDI: ffff888034a8b640 RBP: ffffc90000007901 R08: ffff888034a8b643 R09: 1ffff110069516c8 R10: dffffc0000000000 R11: ffffed10069516c9 R12: ffff888034a8b640 R13: ffff8881463ba418 R14: ffffe8ffffc6a688 R15: ffff888034a8b600 FS: 00007ff8159186c0(0000) GS:ffff888124f96000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5a018df440 CR3: 000000007e9a0000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> tipc_udp_xmit+0xc2/0xc00 net/tipc/udp_media.c:178 tipc_udp_send_msg+0x26b/0x3d0 net/tipc/udp_media.c:271 tipc_bearer_xmit_skb+0x306/0x480 net/tipc/bearer.c:575 tipc_disc_timeout+0x612/0x770 net/tipc/discover.c:338 call_timer_fn+0x189/0x650 kernel/time/timer.c:1789 expire_timers kernel/time/timer.c:1840 [inline] __run_timers kernel/time/timer.c:2414 [inline] __run_timer_base+0x66e/0x8e0 kernel/time/timer.c:2426 run_timer_base kernel/time/timer.c:2435 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2445 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:node_to_entry lib/radix-tree.c:74 [inline] RIP: 0010:delete_node+0x2ac/0x780 lib/radix-tree.c:552 Code: 90 48 89 ee e8 f5 68 15 f9 e9 40 fe ff ff e8 9b 1c 98 f5 40 b5 01 e9 60 04 00 00 e8 8e 1c 98 f5 4c 89 eb 40 b5 01 4c 8b 34 24 <48> 83 cb 02 4c 89 f8 48 c1 e8 03 48 89 44 24 08 42 80 3c 20 00 74 RSP: 0018:ffffc9000f12ece0 EFLAGS: 00000246 RAX: ffffffff8c2b3869 RBX: ffff8880263ef440 RCX: 0000000000080000 RDX: ffffc9000ca55000 RSI: 0000000000011a55 RDI: 0000000000011a56 RBP: 0000000000000000 R08: ffffffff8c2b3860 R09: 1ffff1100659a0f5 R10: dffffc0000000000 R11: ffffed100659a0f6 R12: dffffc0000000000 R13: ffff8880263ef440 R14: ffff88801bef7050 R15: ffff88801bef7058 radix_tree_delete_item+0x2e6/0x3f0 lib/radix-tree.c:1430 kernfs_put+0x172/0x460 fs/kernfs/dir.c:588 kernfs_remove_by_name_ns+0xb5/0x130 fs/kernfs/dir.c:1715 kernfs_remove_by_name include/linux/kernfs.h:633 [inline] remove_files fs/sysfs/group.c:28 [inline] sysfs_remove_group+0xfe/0x2c0 fs/sysfs/group.c:322 sysfs_remove_groups+0x54/0xb0 fs/sysfs/group.c:346 __kobject_del+0x84/0x310 lib/kobject.c:595 kobject_del+0x45/0x60 lib/kobject.c:627 rpc_sysfs_xprt_switch_destroy+0x59/0x90 net/sunrpc/sysfs.c:813 xprt_switch_free net/sunrpc/xprtmultipath.c:194 [inline] kref_put include/linux/kref.h:65 [inline] xprt_switch_put+0x33f/0x3c0 net/sunrpc/xprtmultipath.c:221 rpc_free_client net/sunrpc/clnt.c:1009 [inline] rpc_free_auth net/sunrpc/clnt.c:1033 [inline] rpc_release_client+0x370/0x6f0 net/sunrpc/clnt.c:1048 rpc_shutdown_client+0x4b7/0x6c0 net/sunrpc/clnt.c:972 nfsd_destroy_serv+0x1eb/0x4b0 fs/nfsd/nfssvc.c:546 nfsd_nl_listener_set_doit+0x17c2/0x1870 fs/nfsd/nfsctl.c:2044 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0xb38/0xf00 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x208/0x480 net/netlink/af_netlink.c:2534 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x7f8/0x9a0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8c3/0xcd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:727 ____sys_sendmsg+0x523/0x860 net/socket.c:2566 ___sys_sendmsg net/socket.c:2620 [inline] __sys_sendmsg+0x271/0x360 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff814b8d169 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:00007ff815918038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ff814da5fa0 RCX: 00007ff814b8d169 RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000004 RBP: 00007ff814c0e730 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff814da5fa0 R15: 00007ffdb5c034e8 </TASK> ---------------- Code disassembly (best guess): 0: 90 nop 1: 48 89 ee mov %rbp,%rsi 4: e8 f5 68 15 f9 call 0xf91568fe 9: e9 40 fe ff ff jmp 0xfffffe4e e: e8 9b 1c 98 f5 call 0xf5981cae 13: 40 b5 01 mov $0x1,%bpl 16: e9 60 04 00 00 jmp 0x47b 1b: e8 8e 1c 98 f5 call 0xf5981cae 20: 4c 89 eb mov %r13,%rbx 23: 40 b5 01 mov $0x1,%bpl 26: 4c 8b 34 24 mov (%rsp),%r14 * 2a: 48 83 cb 02 or $0x2,%rbx <-- trapping instruction 2e: 4c 89 f8 mov %r15,%rax 31: 48 c1 e8 03 shr $0x3,%rax 35: 48 89 44 24 08 mov %rax,0x8(%rsp) 3a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) 3f: 74 .byte 0x74 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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