syzbot

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BUG: KMSAN: uninit-value in do_page_fault+0x2e8/0x840 arch/x86/mm/fault.c:1552
CPU: 1 PID: 625 Comm: syz-executor.5 Not tainted 5.7.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x220 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 do_page_fault+0x2e8/0x840 arch/x86/mm/fault.c:1552
 page_fault+0x4e/0x60 arch/x86/entry/entry_64.S:1213
RIP: 0010:____sys_recvmsg+0x7aa/0x1020 net/socket.c:2598
Code: 00 4c 0f 48 f8 45 85 f6 0f 85 65 03 00 00 4d 85 ed 4c 8b b5 18 ff ff ff 0f 85 65 03 00 00 8b 9d 3c ff ff ff 8b 85 10 ff ff ff <41> 89 07 0f 1f 00 4d 85 f6 0f 85 10 05 00 00 48 8b bd b0 fe ff ff
RSP: 0018:ffffa6af04637a70 EFLAGS: 00010246
RAX: 0000000000000020 RBX: 0000000000000040 RCX: 0000000000000028
RDX: 00000000ffffffff RSI: 0000000000000004 RDI: ffffa6af04637b38
RBP: ffffa6af04637bf0 R08: 0000000000000002 R09: ffffa6af04637a18
R10: 0000000000000004 R11: ffffffffa434bbc0 R12: ffff8e291427e558
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000020004030
 ___sys_recvmsg net/socket.c:2627 [inline]
 do_recvmmsg+0x990/0x1e00 net/socket.c:2725
 __sys_recvmmsg net/socket.c:2806 [inline]
 __do_sys_recvmmsg net/socket.c:2827 [inline]
 __se_sys_recvmmsg+0x25d/0x350 net/socket.c:2820
 __x64_sys_recvmmsg+0x62/0x80 net/socket.c:2820
 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ca29
Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fb59b3c8c78 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00000000004fb6c0 RCX: 000000000045ca29
RDX: 04000000000003b4 RSI: 00000000200037c0 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000020003700 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000008a2 R14: 00000000004cb748 R15: 00007fb59b3c96d4

Local variable ----regs@__bpf_prog_run32 created at:
 __bpf_prog_run32+0x87/0x170 kernel/bpf/core.c:1681
 __bpf_prog_run32+0x87/0x170 kernel/bpf/core.c:1681
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