Hi, I've got the following error report while running the syzkaller fuzzer:
BUG: unable to handle kernel NULL pointer dereference at (null) IP: [< (null)>] (null) PGD 66b6f067 [ 102.549865] PUD 66c6e067 PMD 0 [ 102.549865] Oops: 0010 [#1] SMP KASAN Modules linked in: CPU: 0 PID: 4143 Comm: a.out Not tainted 4.9.0-rc3+ #336 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff880066b1c200 task.stack: ffff880065b58000 RIP: 0010:[<0000000000000000>] [< (null)>] (null) RSP: 0018:ffff880065b5fbc0 EFLAGS: 00010246 RAX: ffff880066b1c200 RBX: ffff88006873864a RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffff880068738640 RDI: ffff880063bd3200 RBP: ffff880065b5fd20 R08: 1ffff1000c77a713 R09: dffffc0000000000 R10: ffffffff844fc800 R11: 1ffff1000d0e70c9 R12: ffffffff84e7e040 R13: ffff880068738640 R14: ffff880063bd3200 R15: ffffffff86836380 FS: 00007f40b7acf700(0000) GS:ffff88006cc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000006bb28000 CR4: 00000000000006f0 Stack: ffffffff83099988 ffffffff8479f7e8 ffffffff81208580 1ffff1000000000c 0000000041b58ab3 ffffffff8479f7e8 ffffffff81208580 ffffffff812506ed 0000000000000007 ffff880065b5fc18 ffffffff812506ed ffff880065b5fcd0 Call Trace: [<ffffffff832cf4fc>] inet6_bind+0x8ec/0x1020 net/ipv6/af_inet6.c:384 [<ffffffff82b7033c>] SYSC_bind+0x1ec/0x250 net/socket.c:1367 [<ffffffff82b72ae4>] SyS_bind+0x24/0x30 net/socket.c:1353 [<ffffffff83fc0401>] entry_SYSCALL_64_fastpath+0x1f/0xc2 arch/x86/entry/entry_64.S:209 Code: Bad RIP value. RIP [< (null)>] (null) RSP <ffff880065b5fbc0> CR2: 0000000000000000 ---[ end trace b5ec698ae4926a97 ]--- Kernel panic - not syncing: Fatal exception in interrupt Kernel Offset: disabled ---[ end Kernel panic - not syncing: Fatal exception in interrupt On commit 0c183d92b20b5c84ca655b45ef57b3318b83eb9e (Oct 31). I'm able to reproduce it with the attached program by running it as: $ gcc -lpthread inet6-bind-poc.c $ while true; do ./a.out; done Thanks!
inet6-bind-poc.c
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