On Wed, Mar 23, 2022 at 5:13 PM syzbot <syzbot+090d23ddbd5cd185c2e0@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 36c2e31ad25b net: geneve: add missing netlink policy and s.. > git tree: net-next > console output: https://syzkaller.appspot.com/x/log.txt?x=17c308a5700000 > kernel config: https://syzkaller.appspot.com/x/.config?x=4a15e2288cf165c9 > dashboard link: https://syzkaller.appspot.com/bug?extid=090d23ddbd5cd185c2e0 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=171eadbd700000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12cacda3700000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+090d23ddbd5cd185c2e0@xxxxxxxxxxxxxxxxxxxxxxxxx > AF_SMC does not handle TCP_REPAIR properly. Look at commit d9e4c129181004e ("mptcp: only admit explicitly supported sockopt") for an equivalent bug/fix. > BUG: kernel NULL pointer dereference, address: 0000000000000000 > #PF: supervisor instruction fetch in kernel mode > #PF: error_code(0x0010) - not-present page > PGD 13fd5067 P4D 13fd5067 PUD 77ebc067 PMD 0 > Oops: 0010 [#1] PREEMPT SMP KASAN > CPU: 1 PID: 7423 Comm: syz-executor720 Not tainted 5.17.0-rc8-syzkaller-02803-g36c2e31ad25b #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > RIP: 0010:0x0 > Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. > RSP: 0018:ffffc900001d0a60 EFLAGS: 00010246 > RAX: dffffc0000000000 RBX: ffff88801e00cd10 RCX: 0000000000000100 > RDX: 1ffff11003c019a3 RSI: ffff8880155c5c80 RDI: ffff888014bac800 > RBP: ffff888014bac800 R08: 0000000000000000 R09: 0000000000000000 > R10: ffffffff87bccdc7 R11: 0000000000000000 R12: ffff8880155c5c80 > R13: 0000000000000000 R14: ffff888014bacf60 R15: ffff88807527012c > FS: 000055555733b3c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffffffffffffffd6 CR3: 00000000757b0000 CR4: 00000000003506e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <IRQ> > __tcp_transmit_skb+0x1098/0x38b0 net/ipv4/tcp_output.c:1371 > tcp_transmit_skb net/ipv4/tcp_output.c:1420 [inline] > tcp_xmit_probe_skb+0x28c/0x320 net/ipv4/tcp_output.c:4006 > tcp_write_wakeup+0x1bd/0x610 net/ipv4/tcp_output.c:4059 > tcp_send_probe0+0x44/0x560 net/ipv4/tcp_output.c:4074 > tcp_probe_timer net/ipv4/tcp_timer.c:398 [inline] > tcp_write_timer_handler+0x9ed/0xbc0 net/ipv4/tcp_timer.c:626 > tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:642 > call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421 > expire_timers kernel/time/timer.c:1466 [inline] > __run_timers.part.0+0x67c/0xa30 kernel/time/timer.c:1734 > __run_timers kernel/time/timer.c:1715 [inline] > run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 > __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 > invoke_softirq kernel/softirq.c:432 [inline] > __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637 > irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 > sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 > </IRQ> > <TASK> > asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 > RIP: 0010:lock_acquire+0x1ef/0x510 kernel/locking/lockdep.c:5607 > Code: e4 a4 7e 83 f8 01 0f 85 b4 02 00 00 9c 58 f6 c4 02 0f 85 9f 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24 > RSP: 0018:ffffc90002eaf888 EFLAGS: 00000206 > RAX: dffffc0000000000 RBX: 1ffff920005d5f13 RCX: 5ad5b746ce328923 > RDX: 1ffff1100e5374eb RSI: 0000000000000000 RDI: 0000000000000000 > RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8fe0c947 > R10: fffffbfff1fc1928 R11: 0000000000000001 R12: 0000000000000002 > R13: 0000000000000000 R14: ffffffff8bb84ca0 R15: 0000000000000000 > rcu_lock_acquire include/linux/rcupdate.h:268 [inline] > rcu_read_lock include/linux/rcupdate.h:694 [inline] > fib_lookup.constprop.0+0x8f/0x460 include/net/ip_fib.h:377 > ip_route_output_key_hash_rcu+0xf54/0x2c80 net/ipv4/route.c:2737 > ip_route_output_key_hash+0x183/0x2f0 net/ipv4/route.c:2627 > __ip_route_output_key include/net/route.h:127 [inline] > ip_route_output_flow+0x23/0x150 net/ipv4/route.c:2857 > ip_route_newports include/net/route.h:343 [inline] > tcp_v4_connect+0x12a5/0x1d00 net/ipv4/tcp_ipv4.c:283 > __inet_stream_connect+0x8cf/0xed0 net/ipv4/af_inet.c:660 > inet_stream_connect+0x53/0xa0 net/ipv4/af_inet.c:724 > smc_connect+0x230/0x450 net/smc/af_smc.c:1522 > __sys_connect_file+0x155/0x1a0 net/socket.c:1900 > __sys_connect+0x161/0x190 net/socket.c:1917 > __do_sys_connect net/socket.c:1927 [inline] > __se_sys_connect net/socket.c:1924 [inline] > __x64_sys_connect+0x6f/0xb0 net/socket.c:1924 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x7f23b4ec0889 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 14 00 00 90 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 c0 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ffce8f74658 EFLAGS: 00000246 ORIG_RAX: 000000000000002a > RAX: ffffffffffffffda RBX: 00007ffce8f746b0 RCX: 00007f23b4ec0889 > RDX: 0000000000000010 RSI: 00000000200001c0 RDI: 0000000000000003 > RBP: 0000000000000000 R08: 000000000000cf1c R09: 000000000000cf1c > R10: 0000000000000004 R11: 0000000000000246 R12: 00007ffce8f746a0 > R13: 000000000000cf1c R14: 00007ffce8f7469c R15: 431bde82d7b634db > </TASK> > Modules linked in: > CR2: 0000000000000000 > ---[ end trace 0000000000000000 ]--- > RIP: 0010:0x0 > Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. > RSP: 0018:ffffc900001d0a60 EFLAGS: 00010246 > RAX: dffffc0000000000 RBX: ffff88801e00cd10 RCX: 0000000000000100 > RDX: 1ffff11003c019a3 RSI: ffff8880155c5c80 RDI: ffff888014bac800 > RBP: ffff888014bac800 R08: 0000000000000000 R09: 0000000000000000 > R10: ffffffff87bccdc7 R11: 0000000000000000 R12: ffff8880155c5c80 > R13: 0000000000000000 R14: ffff888014bacf60 R15: ffff88807527012c > FS: 000055555733b3c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffffffffffffffd6 CR3: 00000000757b0000 CR4: 00000000003506e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > ---------------- > Code disassembly (best guess): > 0: e4 a4 in $0xa4,%al > 2: 7e 83 jle 0xffffff87 > 4: f8 clc > 5: 01 0f add %ecx,(%rdi) > 7: 85 b4 02 00 00 9c 58 test %esi,0x589c0000(%rdx,%rax,1) > e: f6 c4 02 test $0x2,%ah > 11: 0f 85 9f 02 00 00 jne 0x2b6 > 17: 48 83 7c 24 08 00 cmpq $0x0,0x8(%rsp) > 1d: 74 01 je 0x20 > 1f: fb sti > 20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax > 27: fc ff df > * 2a: 48 01 c3 add %rax,%rbx <-- trapping instruction > 2d: 48 c7 03 00 00 00 00 movq $0x0,(%rbx) > 34: 48 c7 43 08 00 00 00 movq $0x0,0x8(%rbx) > 3b: 00 > 3c: 48 rex.W > 3d: 8b .byte 0x8b > 3e: 84 .byte 0x84 > 3f: 24 .byte 0x24 > > > --- > 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@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > syzbot can test patches for this issue, for details see: > https://goo.gl/tpsmEJ#testing-patches
