==================================================================
BUG: KMSAN: uninit-value in atomic_sub arch/x86/include/asm/atomic.h:65 [inline]
BUG: KMSAN: uninit-value in af_alg_free_areq_sgls+0x5ff/0xb20 crypto/af_alg.c:669
CPU: 0 PID: 5297 Comm: syz-executor6 Not tainted 4.16.0+ #81
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 atomic_sub arch/x86/include/asm/atomic.h:65 [inline]
 af_alg_free_areq_sgls+0x5ff/0xb20 crypto/af_alg.c:669
 af_alg_free_resources+0x66/0xf0 crypto/af_alg.c:1033
 _skcipher_recvmsg crypto/algif_skcipher.c:151 [inline]
 skcipher_recvmsg+0x599/0x1940 crypto/algif_skcipher.c:164
 sock_recvmsg_nosec net/socket.c:803 [inline]
 sock_recvmsg+0x1d0/0x230 net/socket.c:810
 ___sys_recvmsg+0x3fb/0x810 net/socket.c:2205
 __sys_recvmsg net/socket.c:2250 [inline]
 SYSC_recvmsg+0x298/0x3c0 net/socket.c:2262
 SyS_recvmsg+0x54/0x80 net/socket.c:2257
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x455259
RSP: 002b:00007f6389f1ac68 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007f6389f1b6d4 RCX: 0000000000455259
RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000496 R14: 00000000006f9eb0 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188
 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314
 __kmalloc+0x23c/0x350 mm/slub.c:3791
 kmalloc include/linux/slab.h:517 [inline]
 sock_kmalloc+0x14e/0x270 net/core/sock.c:1986
 af_alg_get_rsgl+0x427/0xe10 crypto/af_alg.c:1149
 _skcipher_recvmsg crypto/algif_skcipher.c:81 [inline]
 skcipher_recvmsg+0x546/0x1940 crypto/algif_skcipher.c:164
 sock_recvmsg_nosec net/socket.c:803 [inline]
 sock_recvmsg+0x1d0/0x230 net/socket.c:810
 ___sys_recvmsg+0x3fb/0x810 net/socket.c:2205
 __sys_recvmsg net/socket.c:2250 [inline]
 SYSC_recvmsg+0x298/0x3c0 net/socket.c:2262
 SyS_recvmsg+0x54/0x80 net/socket.c:2257
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
==================================================================
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 5297 Comm: syz-executor6 Tainted: G    B            4.16.0+ #81
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 panic+0x39d/0x940 kernel/panic.c:183
 kmsan_report+0x238/0x240 mm/kmsan/kmsan.c:1083
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 atomic_sub arch/x86/include/asm/atomic.h:65 [inline]
 af_alg_free_areq_sgls+0x5ff/0xb20 crypto/af_alg.c:669
 af_alg_free_resources+0x66/0xf0 crypto/af_alg.c:1033
 _skcipher_recvmsg crypto/algif_skcipher.c:151 [inline]
 skcipher_recvmsg+0x599/0x1940 crypto/algif_skcipher.c:164
 sock_recvmsg_nosec net/socket.c:803 [inline]
 sock_recvmsg+0x1d0/0x230 net/socket.c:810
 ___sys_recvmsg+0x3fb/0x810 net/socket.c:2205
 __sys_recvmsg net/socket.c:2250 [inline]
 SYSC_recvmsg+0x298/0x3c0 net/socket.c:2262
 SyS_recvmsg+0x54/0x80 net/socket.c:2257
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x455259
RSP: 002b:00007f6389f1ac68 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007f6389f1b6d4 RCX: 0000000000455259
RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000496 R14: 00000000006f9eb0 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..